Remove dynamic translation of regression test scripts, step 1.

pg_regress has long had provisions for dynamically substituting path
names into regression test scripts and result files, but use of that
feature has always been a serious pain in the neck, mainly because
updating the result files requires tedious manual editing.  Let's
get rid of that in favor of passing down the paths in environment
variables.

In addition to being easier to maintain, this way is capable of
dealing with path names that require escaping at runtime, for example
paths containing single-quote marks.  (There are other stumbling
blocks in the way of actually building in a path that looks like
that, but removing this one seems like a good thing to do.)  The key
coding rule that makes that possible is to concatenate pieces of a
dynamically-variable string using psql's \set command, and then use
the :'variable' notation to quote and escape the string for the next
level of interpretation.

In hopes of making this change more transparent to "git blame",
I've split it into two steps.  This commit adds the necessary
pg_regress.c support and changes all the *.source files in-place
so that they no longer require any dynamic translation.  The next
commit will just "git mv" them into the regular sql/ and expected/
directories.

Discussion: https://postgr.es/m/1655733.1639871614@sss.pgh.pa.us

20 files changed, 374 insertions, 230 deletions

diff --git a/src/pl/plpgsql/src/input/plpgsql_copy.source b/src/pl/plpgsql/src/input/plpgsql_copy.source
index b7bcbb7d17f..37f1fa132b2 100644
--- a/src/pl/plpgsql/src/input/plpgsql_copy.source
+++ b/src/pl/plpgsql/src/input/plpgsql_copy.source
@@ -1,3 +1,11 @@
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
+
+-- set up file names to use
+\set srcfilename :abs_srcdir '/data/copy1.data'
+\set destfilename :abs_builddir '/results/copy1.data'
+
 CREATE TABLE copy1 (a int, b float);
 
 -- COPY TO/FROM not authorized from client.
@@ -24,38 +32,26 @@ $$;
 
 -- Valid cases
 -- COPY FROM
-DO LANGUAGE plpgsql $$
-BEGIN
-  COPY copy1 FROM '@abs_srcdir@/data/copy1.data';
-END;
-$$;
+\set dobody 'BEGIN COPY copy1 FROM ' :'srcfilename' '; END'
+DO LANGUAGE plpgsql :'dobody';
 SELECT * FROM copy1 ORDER BY 1;
 TRUNCATE copy1;
-DO LANGUAGE plpgsql $$
-BEGIN
-  EXECUTE 'COPY copy1 FROM ''@abs_srcdir@/data/copy1.data''';
-END;
-$$;
+\set cmd 'COPY copy1 FROM ' :'srcfilename'
+\set dobody 'BEGIN EXECUTE ' :'cmd' '; END'
+DO LANGUAGE plpgsql :'dobody';
 SELECT * FROM copy1 ORDER BY 1;
 
 -- COPY TO
 -- Copy the data externally once, then process it back to the table.
-DO LANGUAGE plpgsql $$
-BEGIN
-  COPY copy1 TO '@abs_builddir@/results/copy1.data';
-END;
-$$;
+\set dobody 'BEGIN COPY copy1 TO ' :'destfilename' '; END'
+DO LANGUAGE plpgsql :'dobody';
 TRUNCATE copy1;
-DO LANGUAGE plpgsql $$
-BEGIN
-  COPY copy1 FROM '@abs_builddir@/results/copy1.data';
-END;
-$$;
-DO LANGUAGE plpgsql $$
-BEGIN
-  EXECUTE 'COPY copy1 FROM ''@abs_builddir@/results/copy1.data''';
-END;
-$$;
+\set dobody 'BEGIN COPY copy1 FROM ' :'destfilename' '; END'
+DO LANGUAGE plpgsql :'dobody';
+
+\set cmd 'COPY copy1 FROM ' :'destfilename'
+\set dobody 'BEGIN EXECUTE ' :'cmd' '; END'
+DO LANGUAGE plpgsql :'dobody';
 
 SELECT * FROM copy1 ORDER BY 1;
 
diff --git a/src/pl/plpgsql/src/output/plpgsql_copy.source b/src/pl/plpgsql/src/output/plpgsql_copy.source
index 86e833d055a..bc834be1971 100644
--- a/src/pl/plpgsql/src/output/plpgsql_copy.source
+++ b/src/pl/plpgsql/src/output/plpgsql_copy.source
@@ -1,3 +1,9 @@
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
+-- set up file names to use
+\set srcfilename :abs_srcdir '/data/copy1.data'
+\set destfilename :abs_builddir '/results/copy1.data'
 CREATE TABLE copy1 (a int, b float);
 -- COPY TO/FROM not authorized from client.
 DO LANGUAGE plpgsql $$
@@ -30,11 +36,8 @@ ERROR:  cannot COPY to/from client in PL/pgSQL
 CONTEXT:  PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- Valid cases
 -- COPY FROM
-DO LANGUAGE plpgsql $$
-BEGIN
-  COPY copy1 FROM '@abs_srcdir@/data/copy1.data';
-END;
-$$;
+\set dobody 'BEGIN COPY copy1 FROM ' :'srcfilename' '; END'
+DO LANGUAGE plpgsql :'dobody';
 SELECT * FROM copy1 ORDER BY 1;
  a |  b  
 ---+-----
@@ -44,11 +47,9 @@ SELECT * FROM copy1 ORDER BY 1;
 (3 rows)
 
 TRUNCATE copy1;
-DO LANGUAGE plpgsql $$
-BEGIN
-  EXECUTE 'COPY copy1 FROM ''@abs_srcdir@/data/copy1.data''';
-END;
-$$;
+\set cmd 'COPY copy1 FROM ' :'srcfilename'
+\set dobody 'BEGIN EXECUTE ' :'cmd' '; END'
+DO LANGUAGE plpgsql :'dobody';
 SELECT * FROM copy1 ORDER BY 1;
  a |  b  
 ---+-----
@@ -59,22 +60,14 @@ SELECT * FROM copy1 ORDER BY 1;
 
 -- COPY TO
 -- Copy the data externally once, then process it back to the table.
-DO LANGUAGE plpgsql $$
-BEGIN
-  COPY copy1 TO '@abs_builddir@/results/copy1.data';
-END;
-$$;
+\set dobody 'BEGIN COPY copy1 TO ' :'destfilename' '; END'
+DO LANGUAGE plpgsql :'dobody';
 TRUNCATE copy1;
-DO LANGUAGE plpgsql $$
-BEGIN
-  COPY copy1 FROM '@abs_builddir@/results/copy1.data';
-END;
-$$;
-DO LANGUAGE plpgsql $$
-BEGIN
-  EXECUTE 'COPY copy1 FROM ''@abs_builddir@/results/copy1.data''';
-END;
-$$;
+\set dobody 'BEGIN COPY copy1 FROM ' :'destfilename' '; END'
+DO LANGUAGE plpgsql :'dobody';
+\set cmd 'COPY copy1 FROM ' :'destfilename'
+\set dobody 'BEGIN EXECUTE ' :'cmd' '; END'
+DO LANGUAGE plpgsql :'dobody';
 SELECT * FROM copy1 ORDER BY 1;
  a |  b  
 ---+-----
diff --git a/src/test/regress/input/constraints.source b/src/test/regress/input/constraints.source
index 6bb76483218..458f8057785 100644
--- a/src/test/regress/input/constraints.source
+++ b/src/test/regress/input/constraints.source
@@ -8,6 +8,9 @@
 --  - EXCLUDE clauses
 --
 
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+
 --
 -- DEFAULT syntax
 --
@@ -239,11 +242,13 @@ CREATE TABLE COPY_TBL (x INT, y TEXT, z INT,
 	CONSTRAINT COPY_CON
 	CHECK (x > 3 AND y <> 'check failed' AND x < 7 ));
 
-COPY COPY_TBL FROM '@abs_srcdir@/data/constro.data';
+\set filename :abs_srcdir '/data/constro.data'
+COPY COPY_TBL FROM :'filename';
 
 SELECT * FROM COPY_TBL;
 
-COPY COPY_TBL FROM '@abs_srcdir@/data/constrf.data';
+\set filename :abs_srcdir '/data/constrf.data'
+COPY COPY_TBL FROM :'filename';
 
 SELECT * FROM COPY_TBL;
 
diff --git a/src/test/regress/input/copy.source b/src/test/regress/input/copy.source
index 8acb5168015..15e26517ecb 100644
--- a/src/test/regress/input/copy.source
+++ b/src/test/regress/input/copy.source
@@ -2,65 +2,90 @@
 -- COPY
 --
 
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
+
 -- CLASS POPULATION
 --	(any resemblance to real life is purely coincidental)
 --
-COPY aggtest FROM '@abs_srcdir@/data/agg.data';
+\set filename :abs_srcdir '/data/agg.data'
+COPY aggtest FROM :'filename';
 
-COPY onek FROM '@abs_srcdir@/data/onek.data';
+\set filename :abs_srcdir '/data/onek.data'
+COPY onek FROM :'filename';
 
-COPY onek TO '@abs_builddir@/results/onek.data';
+\set filename :abs_builddir '/results/onek.data'
+COPY onek TO :'filename';
 
 DELETE FROM onek;
 
-COPY onek FROM '@abs_builddir@/results/onek.data';
+COPY onek FROM :'filename';
 
-COPY tenk1 FROM '@abs_srcdir@/data/tenk.data';
+\set filename :abs_srcdir '/data/tenk.data'
+COPY tenk1 FROM :'filename';
 
-COPY slow_emp4000 FROM '@abs_srcdir@/data/rect.data';
+\set filename :abs_srcdir '/data/rect.data'
+COPY slow_emp4000 FROM :'filename';
 
-COPY person FROM '@abs_srcdir@/data/person.data';
+\set filename :abs_srcdir '/data/person.data'
+COPY person FROM :'filename';
 
-COPY emp FROM '@abs_srcdir@/data/emp.data';
+\set filename :abs_srcdir '/data/emp.data'
+COPY emp FROM :'filename';
 
-COPY student FROM '@abs_srcdir@/data/student.data';
+\set filename :abs_srcdir '/data/student.data'
+COPY student FROM :'filename';
 
-COPY stud_emp FROM '@abs_srcdir@/data/stud_emp.data';
+\set filename :abs_srcdir '/data/stud_emp.data'
+COPY stud_emp FROM :'filename';
 
-COPY road FROM '@abs_srcdir@/data/streets.data';
+\set filename :abs_srcdir '/data/streets.data'
+COPY road FROM :'filename';
 
-COPY real_city FROM '@abs_srcdir@/data/real_city.data';
+\set filename :abs_srcdir '/data/real_city.data'
+COPY real_city FROM :'filename';
 
-COPY hash_i4_heap FROM '@abs_srcdir@/data/hash.data';
+\set filename :abs_srcdir '/data/hash.data'
+COPY hash_i4_heap FROM :'filename';
 
-COPY hash_name_heap FROM '@abs_srcdir@/data/hash.data';
+COPY hash_name_heap FROM :'filename';
 
-COPY hash_txt_heap FROM '@abs_srcdir@/data/hash.data';
+COPY hash_txt_heap FROM :'filename';
 
-COPY hash_f8_heap FROM '@abs_srcdir@/data/hash.data';
+COPY hash_f8_heap FROM :'filename';
 
-COPY test_tsvector FROM '@abs_srcdir@/data/tsearch.data';
+\set filename :abs_srcdir '/data/tsearch.data'
+COPY test_tsvector FROM :'filename';
 
-COPY testjsonb FROM '@abs_srcdir@/data/jsonb.data';
+\set filename :abs_srcdir '/data/jsonb.data'
+COPY testjsonb FROM :'filename';
 
 -- the data in this file has a lot of duplicates in the index key
 -- fields, leading to long bucket chains and lots of table expansion.
 -- this is therefore a stress test of the bucket overflow code (unlike
 -- the data in hash.data, which has unique index keys).
 --
--- COPY hash_ovfl_heap FROM '@abs_srcdir@/data/hashovfl.data';
+-- \set filename :abs_srcdir '/data/hashovfl.data'
+-- COPY hash_ovfl_heap FROM :'filename';
 
-COPY bt_i4_heap FROM '@abs_srcdir@/data/desc.data';
+\set filename :abs_srcdir '/data/desc.data'
+COPY bt_i4_heap FROM :'filename';
 
-COPY bt_name_heap FROM '@abs_srcdir@/data/hash.data';
+\set filename :abs_srcdir '/data/hash.data'
+COPY bt_name_heap FROM :'filename';
 
-COPY bt_txt_heap FROM '@abs_srcdir@/data/desc.data';
+\set filename :abs_srcdir '/data/desc.data'
+COPY bt_txt_heap FROM :'filename';
 
-COPY bt_f8_heap FROM '@abs_srcdir@/data/hash.data';
+\set filename :abs_srcdir '/data/hash.data'
+COPY bt_f8_heap FROM :'filename';
 
-COPY array_op_test FROM '@abs_srcdir@/data/array.data';
+\set filename :abs_srcdir '/data/array.data'
+COPY array_op_test FROM :'filename';
 
-COPY array_index_op_test FROM '@abs_srcdir@/data/array.data';
+\set filename :abs_srcdir '/data/array.data'
+COPY array_index_op_test FROM :'filename';
 
 -- analyze all the data we just loaded, to ensure plan consistency
 -- in later tests
@@ -100,11 +125,12 @@ insert into copytest values('Unix',E'abc\ndef',2);
 insert into copytest values('Mac',E'abc\rdef',3);
 insert into copytest values(E'esc\\ape',E'a\\r\\\r\\\n\\nb',4);
 
-copy copytest to '@abs_builddir@/results/copytest.csv' csv;
+\set filename :abs_builddir '/results/copytest.csv'
+copy copytest to :'filename' csv;
 
 create temp table copytest2 (like copytest);
 
-copy copytest2 from '@abs_builddir@/results/copytest.csv' csv;
+copy copytest2 from :'filename' csv;
 
 select * from copytest except select * from copytest2;
 
@@ -112,9 +138,9 @@ truncate copytest2;
 
 --- same test but with an escape char different from quote char
 
-copy copytest to '@abs_builddir@/results/copytest.csv' csv quote '''' escape E'\\';
+copy copytest to :'filename' csv quote '''' escape E'\\';
 
-copy copytest2 from '@abs_builddir@/results/copytest.csv' csv quote '''' escape E'\\';
+copy copytest2 from :'filename' csv quote '''' escape E'\\';
 
 select * from copytest except select * from copytest2;
 
@@ -153,16 +179,17 @@ insert into parted_copytest select x,1,'One' from generate_series(1,1000) x;
 insert into parted_copytest select x,2,'Two' from generate_series(1001,1010) x;
 insert into parted_copytest select x,1,'One' from generate_series(1011,1020) x;
 
-copy (select * from parted_copytest order by a) to '@abs_builddir@/results/parted_copytest.csv';
+\set filename :abs_builddir '/results/parted_copytest.csv'
+copy (select * from parted_copytest order by a) to :'filename';
 
 truncate parted_copytest;
 
-copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv';
+copy parted_copytest from :'filename';
 
 -- Ensure COPY FREEZE errors for partitioned tables.
 begin;
 truncate parted_copytest;
-copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv' (freeze);
+copy parted_copytest from :'filename' (freeze);
 rollback;
 
 select tableoid::regclass,count(*),sum(a) from parted_copytest
@@ -182,7 +209,7 @@ create trigger part_ins_trig
 	for each row
 	execute procedure part_ins_func();
 
-copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv';
+copy parted_copytest from :'filename';
 
 select tableoid::regclass,count(*),sum(a) from parted_copytest
 group by tableoid order by tableoid::regclass::name;
@@ -257,7 +284,8 @@ bill	20	(11,10)	1000	sharon
 
 -- Generate COPY FROM report with FILE, with some excluded tuples.
 truncate tab_progress_reporting;
-copy tab_progress_reporting from '@abs_srcdir@/data/emp.data'
+\set filename :abs_srcdir '/data/emp.data'
+copy tab_progress_reporting from :'filename'
 	where (salary < 2000);
 
 drop trigger check_after_tab_progress_reporting on tab_progress_reporting;
diff --git a/src/test/regress/input/create_function_0.source b/src/test/regress/input/create_function_0.source
index f47f635789a..c5224742f94 100644
--- a/src/test/regress/input/create_function_0.source
+++ b/src/test/regress/input/create_function_0.source
@@ -2,70 +2,78 @@
 -- CREATE_FUNCTION_0
 --
 
+-- directory path and dlsuffix are passed to us in environment variables
+\getenv libdir PG_LIBDIR
+\getenv dlsuffix PG_DLSUFFIX
+
+\set autoinclib :libdir '/autoinc' :dlsuffix
+\set refintlib :libdir '/refint' :dlsuffix
+\set regresslib :libdir '/regress' :dlsuffix
+
 -- Create a bunch of C functions that will be used by later tests:
 
 CREATE FUNCTION check_primary_key ()
 	RETURNS trigger
-	AS '@libdir@/refint@DLSUFFIX@'
+	AS :'refintlib'
 	LANGUAGE C;
 
 CREATE FUNCTION check_foreign_key ()
 	RETURNS trigger
-	AS '@libdir@/refint@DLSUFFIX@'
+	AS :'refintlib'
 	LANGUAGE C;
 
 CREATE FUNCTION autoinc ()
 	RETURNS trigger
-	AS '@libdir@/autoinc@DLSUFFIX@'
+	AS :'autoinclib'
 	LANGUAGE C;
 
 CREATE FUNCTION trigger_return_old ()
         RETURNS trigger
-        AS '@libdir@/regress@DLSUFFIX@'
+        AS :'regresslib'
         LANGUAGE C;
 
 CREATE FUNCTION ttdummy ()
         RETURNS trigger
-        AS '@libdir@/regress@DLSUFFIX@'
+        AS :'regresslib'
         LANGUAGE C;
 
 CREATE FUNCTION set_ttdummy (int4)
         RETURNS int4
-        AS '@libdir@/regress@DLSUFFIX@'
+        AS :'regresslib'
         LANGUAGE C STRICT;
 
 CREATE FUNCTION make_tuple_indirect (record)
         RETURNS record
-        AS '@libdir@/regress@DLSUFFIX@'
+        AS :'regresslib'
         LANGUAGE C STRICT;
 
 CREATE FUNCTION test_atomic_ops()
     RETURNS bool
-    AS '@libdir@/regress@DLSUFFIX@'
+    AS :'regresslib'
     LANGUAGE C;
 
 CREATE FUNCTION test_fdw_handler()
     RETURNS fdw_handler
-    AS '@libdir@/regress@DLSUFFIX@', 'test_fdw_handler'
+    AS :'regresslib', 'test_fdw_handler'
     LANGUAGE C;
 
 CREATE FUNCTION test_support_func(internal)
     RETURNS internal
-    AS '@libdir@/regress@DLSUFFIX@', 'test_support_func'
+    AS :'regresslib', 'test_support_func'
     LANGUAGE C STRICT;
 
 CREATE FUNCTION test_opclass_options_func(internal)
     RETURNS void
-    AS '@libdir@/regress@DLSUFFIX@', 'test_opclass_options_func'
+    AS :'regresslib', 'test_opclass_options_func'
     LANGUAGE C;
 
 CREATE FUNCTION test_enc_conversion(bytea, name, name, bool, validlen OUT int, result OUT bytea)
-    AS '@libdir@/regress@DLSUFFIX@', 'test_enc_conversion'
+    AS :'regresslib', 'test_enc_conversion'
     LANGUAGE C STRICT;
 
 CREATE FUNCTION binary_coercible(oid, oid)
     RETURNS bool
-    AS '@libdir@/regress@DLSUFFIX@', 'binary_coercible'
+    AS :'regresslib', 'binary_coercible'
     LANGUAGE C STRICT STABLE PARALLEL SAFE;
 
 -- Things that shouldn't work:
@@ -88,8 +96,13 @@ CREATE FUNCTION test1 (int) RETURNS int LANGUAGE SQL
 CREATE FUNCTION test1 (int) RETURNS int LANGUAGE C
     AS 'nosuchfile';
 
+-- To produce stable regression test output, we have to filter the name
+-- of the regresslib file out of the error message in this test.
+\set VERBOSITY sqlstate
 CREATE FUNCTION test1 (int) RETURNS int LANGUAGE C
-    AS '@libdir@/regress@DLSUFFIX@', 'nosuchsymbol';
+    AS :'regresslib', 'nosuchsymbol';
+\set VERBOSITY default
+SELECT regexp_replace(:'LAST_ERROR_MESSAGE', 'file ".*"', 'file "..."');
 
 CREATE FUNCTION test1 (int) RETURNS int LANGUAGE internal
     AS 'nosuch';
diff --git a/src/test/regress/input/create_function_1.source b/src/test/regress/input/create_function_1.source
index 79a41562bb0..4170b16fe6b 100644
--- a/src/test/regress/input/create_function_1.source
+++ b/src/test/regress/input/create_function_1.source
@@ -2,24 +2,30 @@
 -- CREATE_FUNCTION_1
 --
 
+-- directory path and dlsuffix are passed to us in environment variables
+\getenv libdir PG_LIBDIR
+\getenv dlsuffix PG_DLSUFFIX
+
+\set regresslib :libdir '/regress' :dlsuffix
+
 -- Create C functions needed by create_type.sql
 
 CREATE FUNCTION widget_in(cstring)
    RETURNS widget
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT IMMUTABLE;
 
 CREATE FUNCTION widget_out(widget)
    RETURNS cstring
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT IMMUTABLE;
 
 CREATE FUNCTION int44in(cstring)
    RETURNS city_budget
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT IMMUTABLE;
 
 CREATE FUNCTION int44out(city_budget)
    RETURNS cstring
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT IMMUTABLE;
diff --git a/src/test/regress/input/create_function_2.source b/src/test/regress/input/create_function_2.source
index 9e6d2942ec7..67510aed239 100644
--- a/src/test/regress/input/create_function_2.source
+++ b/src/test/regress/input/create_function_2.source
@@ -1,6 +1,14 @@
 --
 -- CREATE_FUNCTION_2
 --
+
+-- directory path and dlsuffix are passed to us in environment variables
+\getenv libdir PG_LIBDIR
+\getenv dlsuffix PG_DLSUFFIX
+
+\set regresslib :libdir '/regress' :dlsuffix
+
+
 CREATE FUNCTION hobbies(person)
    RETURNS setof hobbies_r
    AS 'select * from hobbies_r where person = $1.name'
@@ -64,25 +72,25 @@ CREATE FUNCTION equipment_named_ambiguous_2b(hobby text)
 
 CREATE FUNCTION pt_in_widget(point, widget)
    RETURNS bool
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT;
 
 CREATE FUNCTION overpaid(emp)
    RETURNS bool
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT;
 
 CREATE FUNCTION interpt_pp(path, path)
    RETURNS point
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT;
 
 CREATE FUNCTION reverse_name(name)
    RETURNS name
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT;
 
 --
 -- Function dynamic loading
 --
-LOAD '@libdir@/regress@DLSUFFIX@';
+LOAD :'regresslib';
diff --git a/src/test/regress/input/largeobject.source b/src/test/regress/input/largeobject.source
index b1e7ae99096..16da077f3a2 100644
--- a/src/test/regress/input/largeobject.source
+++ b/src/test/regress/input/largeobject.source
@@ -2,6 +2,10 @@
 -- Test large object support
 --
 
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
+
 -- ensure consistent test output regardless of the default bytea format
 SET bytea_output TO escape;
 
@@ -124,16 +128,13 @@ BEGIN;
 SELECT lo_open(loid, x'40000'::int) from lotest_stash_values;
 ABORT;
 
-DO $$
-DECLARE
-  loid oid;
-BEGIN
-  SELECT tbl.loid INTO loid FROM lotest_stash_values tbl;
-  PERFORM lo_export(loid, '@abs_builddir@/results/invalid/path');
-EXCEPTION
-  WHEN UNDEFINED_FILE THEN RAISE NOTICE 'could not open file, as expected';
-END;
-$$;
+\set filename :abs_builddir '/results/invalid/path'
+\set dobody 'DECLARE loid oid; BEGIN '
+\set dobody :dobody 'SELECT tbl.loid INTO loid FROM lotest_stash_values tbl; '
+\set dobody :dobody 'PERFORM lo_export(loid, ' :'filename' '); '
+\set dobody :dobody 'EXCEPTION WHEN UNDEFINED_FILE THEN '
+\set dobody :dobody 'RAISE NOTICE ''could not open file, as expected''; END'
+DO :'dobody';
 
 -- Test truncation.
 BEGIN;
@@ -183,7 +184,8 @@ SELECT lo_unlink(loid) from lotest_stash_values;
 
 TRUNCATE lotest_stash_values;
 
-INSERT INTO lotest_stash_values (loid) SELECT lo_import('@abs_srcdir@/data/tenk.data');
+\set filename :abs_srcdir '/data/tenk.data'
+INSERT INTO lotest_stash_values (loid) SELECT lo_import(:'filename');
 
 BEGIN;
 UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
@@ -212,14 +214,16 @@ SELECT loread(fd, 36) FROM lotest_stash_values;
 SELECT lo_close(fd) FROM lotest_stash_values;
 END;
 
-SELECT lo_export(loid, '@abs_builddir@/results/lotest.txt') FROM lotest_stash_values;
+\set filename :abs_builddir '/results/lotest.txt'
+SELECT lo_export(loid, :'filename') FROM lotest_stash_values;
 
-\lo_import '@abs_builddir@/results/lotest.txt'
+\lo_import :filename
 
 \set newloid :LASTOID
 
 -- just make sure \lo_export does not barf
-\lo_export :newloid '@abs_builddir@/results/lotest2.txt'
+\set filename :abs_builddir '/results/lotest2.txt'
+\lo_export :newloid :filename
 
 -- This is a hack to test that export/import are reversible
 -- This uses knowledge about the inner workings of large object mechanism
@@ -234,7 +238,8 @@ TRUNCATE lotest_stash_values;
 
 \lo_unlink :newloid
 
-\lo_import '@abs_builddir@/results/lotest.txt'
+\set filename :abs_builddir '/results/lotest.txt'
+\lo_import :filename
 
 \set newloid_1 :LASTOID
 
diff --git a/src/test/regress/input/misc.source b/src/test/regress/input/misc.source
index b1dbc573c9b..a1e2f779ba7 100644
--- a/src/test/regress/input/misc.source
+++ b/src/test/regress/input/misc.source
@@ -2,6 +2,10 @@
 -- MISC
 --
 
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
+
 --
 -- BTREE
 --
@@ -51,25 +55,27 @@ DROP TABLE tmp;
 --
 -- copy
 --
-COPY onek TO '@abs_builddir@/results/onek.data';
+\set filename :abs_builddir '/results/onek.data'
+COPY onek TO :'filename';
 
 DELETE FROM onek;
 
-COPY onek FROM '@abs_builddir@/results/onek.data';
+COPY onek FROM :'filename';
 
 SELECT unique1 FROM onek WHERE unique1 < 2 ORDER BY unique1;
 
 DELETE FROM onek2;
 
-COPY onek2 FROM '@abs_builddir@/results/onek.data';
+COPY onek2 FROM :'filename';
 
 SELECT unique1 FROM onek2 WHERE unique1 < 2 ORDER BY unique1;
 
-COPY BINARY stud_emp TO '@abs_builddir@/results/stud_emp.data';
+\set filename :abs_builddir '/results/stud_emp.data'
+COPY BINARY stud_emp TO :'filename';
 
 DELETE FROM stud_emp;
 
-COPY BINARY stud_emp FROM '@abs_builddir@/results/stud_emp.data';
+COPY BINARY stud_emp FROM :'filename';
 
 SELECT * FROM stud_emp;
 
diff --git a/src/test/regress/input/tablespace.source b/src/test/regress/input/tablespace.source
index c133e73499f..92076db9a13 100644
--- a/src/test/regress/input/tablespace.source
+++ b/src/test/regress/input/tablespace.source
@@ -1,6 +1,11 @@
+-- directory paths are passed to us in environment variables
+\getenv abs_builddir PG_ABS_BUILDDIR
+
+\set testtablespace :abs_builddir '/testtablespace'
+
 -- create a tablespace using WITH clause
-CREATE TABLESPACE regress_tblspacewith LOCATION '@testtablespace@' WITH (some_nonexistent_parameter = true); -- fail
-CREATE TABLESPACE regress_tblspacewith LOCATION '@testtablespace@' WITH (random_page_cost = 3.0); -- ok
+CREATE TABLESPACE regress_tblspacewith LOCATION :'testtablespace' WITH (some_nonexistent_parameter = true); -- fail
+CREATE TABLESPACE regress_tblspacewith LOCATION :'testtablespace' WITH (random_page_cost = 3.0); -- ok
 
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
@@ -9,7 +14,7 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 DROP TABLESPACE regress_tblspacewith;
 
 -- create a tablespace we can use
-CREATE TABLESPACE regress_tblspace LOCATION '@testtablespace@';
+CREATE TABLESPACE regress_tblspace LOCATION :'testtablespace';
 
 -- try setting and resetting some properties for the new tablespace
 ALTER TABLESPACE regress_tblspace SET (random_page_cost = 1.0, seq_page_cost = 1.1);
diff --git a/src/test/regress/output/constraints.source b/src/test/regress/output/constraints.source
index eff793cc3d3..e32cf8bb574 100644
--- a/src/test/regress/output/constraints.source
+++ b/src/test/regress/output/constraints.source
@@ -7,6 +7,8 @@
 --  - UNIQUE clauses
 --  - EXCLUDE clauses
 --
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
 --
 -- DEFAULT syntax
 --
@@ -346,7 +348,8 @@ SELECT * FROM INSERT_TBL;
 CREATE TABLE COPY_TBL (x INT, y TEXT, z INT,
 	CONSTRAINT COPY_CON
 	CHECK (x > 3 AND y <> 'check failed' AND x < 7 ));
-COPY COPY_TBL FROM '@abs_srcdir@/data/constro.data';
+\set filename :abs_srcdir '/data/constro.data'
+COPY COPY_TBL FROM :'filename';
 SELECT * FROM COPY_TBL;
  x |       y       | z 
 ---+---------------+---
@@ -354,7 +357,8 @@ SELECT * FROM COPY_TBL;
  6 | OK            | 4
 (2 rows)
 
-COPY COPY_TBL FROM '@abs_srcdir@/data/constrf.data';
+\set filename :abs_srcdir '/data/constrf.data'
+COPY COPY_TBL FROM :'filename';
 ERROR:  new row for relation "copy_tbl" violates check constraint "copy_con"
 DETAIL:  Failing row contains (7, check failed, 6).
 CONTEXT:  COPY copy_tbl, line 2: "7	check failed	6"
diff --git a/src/test/regress/output/copy.source b/src/test/regress/output/copy.source
index 25bdec6c60e..931e7b2e699 100644
--- a/src/test/regress/output/copy.source
+++ b/src/test/regress/output/copy.source
@@ -1,40 +1,64 @@
 --
 -- COPY
 --
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
 -- CLASS POPULATION
 --	(any resemblance to real life is purely coincidental)
 --
-COPY aggtest FROM '@abs_srcdir@/data/agg.data';
-COPY onek FROM '@abs_srcdir@/data/onek.data';
-COPY onek TO '@abs_builddir@/results/onek.data';
+\set filename :abs_srcdir '/data/agg.data'
+COPY aggtest FROM :'filename';
+\set filename :abs_srcdir '/data/onek.data'
+COPY onek FROM :'filename';
+\set filename :abs_builddir '/results/onek.data'
+COPY onek TO :'filename';
 DELETE FROM onek;
-COPY onek FROM '@abs_builddir@/results/onek.data';
-COPY tenk1 FROM '@abs_srcdir@/data/tenk.data';
-COPY slow_emp4000 FROM '@abs_srcdir@/data/rect.data';
-COPY person FROM '@abs_srcdir@/data/person.data';
-COPY emp FROM '@abs_srcdir@/data/emp.data';
-COPY student FROM '@abs_srcdir@/data/student.data';
-COPY stud_emp FROM '@abs_srcdir@/data/stud_emp.data';
-COPY road FROM '@abs_srcdir@/data/streets.data';
-COPY real_city FROM '@abs_srcdir@/data/real_city.data';
-COPY hash_i4_heap FROM '@abs_srcdir@/data/hash.data';
-COPY hash_name_heap FROM '@abs_srcdir@/data/hash.data';
-COPY hash_txt_heap FROM '@abs_srcdir@/data/hash.data';
-COPY hash_f8_heap FROM '@abs_srcdir@/data/hash.data';
-COPY test_tsvector FROM '@abs_srcdir@/data/tsearch.data';
-COPY testjsonb FROM '@abs_srcdir@/data/jsonb.data';
+COPY onek FROM :'filename';
+\set filename :abs_srcdir '/data/tenk.data'
+COPY tenk1 FROM :'filename';
+\set filename :abs_srcdir '/data/rect.data'
+COPY slow_emp4000 FROM :'filename';
+\set filename :abs_srcdir '/data/person.data'
+COPY person FROM :'filename';
+\set filename :abs_srcdir '/data/emp.data'
+COPY emp FROM :'filename';
+\set filename :abs_srcdir '/data/student.data'
+COPY student FROM :'filename';
+\set filename :abs_srcdir '/data/stud_emp.data'
+COPY stud_emp FROM :'filename';
+\set filename :abs_srcdir '/data/streets.data'
+COPY road FROM :'filename';
+\set filename :abs_srcdir '/data/real_city.data'
+COPY real_city FROM :'filename';
+\set filename :abs_srcdir '/data/hash.data'
+COPY hash_i4_heap FROM :'filename';
+COPY hash_name_heap FROM :'filename';
+COPY hash_txt_heap FROM :'filename';
+COPY hash_f8_heap FROM :'filename';
+\set filename :abs_srcdir '/data/tsearch.data'
+COPY test_tsvector FROM :'filename';
+\set filename :abs_srcdir '/data/jsonb.data'
+COPY testjsonb FROM :'filename';
 -- the data in this file has a lot of duplicates in the index key
 -- fields, leading to long bucket chains and lots of table expansion.
 -- this is therefore a stress test of the bucket overflow code (unlike
 -- the data in hash.data, which has unique index keys).
 --
--- COPY hash_ovfl_heap FROM '@abs_srcdir@/data/hashovfl.data';
-COPY bt_i4_heap FROM '@abs_srcdir@/data/desc.data';
-COPY bt_name_heap FROM '@abs_srcdir@/data/hash.data';
-COPY bt_txt_heap FROM '@abs_srcdir@/data/desc.data';
-COPY bt_f8_heap FROM '@abs_srcdir@/data/hash.data';
-COPY array_op_test FROM '@abs_srcdir@/data/array.data';
-COPY array_index_op_test FROM '@abs_srcdir@/data/array.data';
+-- \set filename :abs_srcdir '/data/hashovfl.data'
+-- COPY hash_ovfl_heap FROM :'filename';
+\set filename :abs_srcdir '/data/desc.data'
+COPY bt_i4_heap FROM :'filename';
+\set filename :abs_srcdir '/data/hash.data'
+COPY bt_name_heap FROM :'filename';
+\set filename :abs_srcdir '/data/desc.data'
+COPY bt_txt_heap FROM :'filename';
+\set filename :abs_srcdir '/data/hash.data'
+COPY bt_f8_heap FROM :'filename';
+\set filename :abs_srcdir '/data/array.data'
+COPY array_op_test FROM :'filename';
+\set filename :abs_srcdir '/data/array.data'
+COPY array_index_op_test FROM :'filename';
 -- analyze all the data we just loaded, to ensure plan consistency
 -- in later tests
 ANALYZE aggtest;
@@ -68,9 +92,10 @@ insert into copytest values('DOS',E'abc\r\ndef',1);
 insert into copytest values('Unix',E'abc\ndef',2);
 insert into copytest values('Mac',E'abc\rdef',3);
 insert into copytest values(E'esc\\ape',E'a\\r\\\r\\\n\\nb',4);
-copy copytest to '@abs_builddir@/results/copytest.csv' csv;
+\set filename :abs_builddir '/results/copytest.csv'
+copy copytest to :'filename' csv;
 create temp table copytest2 (like copytest);
-copy copytest2 from '@abs_builddir@/results/copytest.csv' csv;
+copy copytest2 from :'filename' csv;
 select * from copytest except select * from copytest2;
  style | test | filler 
 -------+------+--------
@@ -78,8 +103,8 @@ select * from copytest except select * from copytest2;
 
 truncate copytest2;
 --- same test but with an escape char different from quote char
-copy copytest to '@abs_builddir@/results/copytest.csv' csv quote '''' escape E'\\';
-copy copytest2 from '@abs_builddir@/results/copytest.csv' csv quote '''' escape E'\\';
+copy copytest to :'filename' csv quote '''' escape E'\\';
+copy copytest2 from :'filename' csv quote '''' escape E'\\';
 select * from copytest except select * from copytest2;
  style | test | filler 
 -------+------+--------
@@ -110,13 +135,14 @@ alter table parted_copytest attach partition parted_copytest_a2 for values in(2)
 insert into parted_copytest select x,1,'One' from generate_series(1,1000) x;
 insert into parted_copytest select x,2,'Two' from generate_series(1001,1010) x;
 insert into parted_copytest select x,1,'One' from generate_series(1011,1020) x;
-copy (select * from parted_copytest order by a) to '@abs_builddir@/results/parted_copytest.csv';
+\set filename :abs_builddir '/results/parted_copytest.csv'
+copy (select * from parted_copytest order by a) to :'filename';
 truncate parted_copytest;
-copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv';
+copy parted_copytest from :'filename';
 -- Ensure COPY FREEZE errors for partitioned tables.
 begin;
 truncate parted_copytest;
-copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv' (freeze);
+copy parted_copytest from :'filename' (freeze);
 ERROR:  cannot perform COPY FREEZE on a partitioned table
 rollback;
 select tableoid::regclass,count(*),sum(a) from parted_copytest
@@ -138,7 +164,7 @@ create trigger part_ins_trig
 	before insert on parted_copytest_a2
 	for each row
 	execute procedure part_ins_func();
-copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv';
+copy parted_copytest from :'filename';
 select tableoid::regclass,count(*),sum(a) from parted_copytest
 group by tableoid order by tableoid::regclass::name;
       tableoid      | count |  sum   
@@ -213,7 +239,8 @@ copy tab_progress_reporting from stdin;
 INFO:  progress: {"type": "PIPE", "command": "COPY FROM", "relname": "tab_progress_reporting", "has_bytes_total": false, "tuples_excluded": 0, "tuples_processed": 3, "has_bytes_processed": true}
 -- Generate COPY FROM report with FILE, with some excluded tuples.
 truncate tab_progress_reporting;
-copy tab_progress_reporting from '@abs_srcdir@/data/emp.data'
+\set filename :abs_srcdir '/data/emp.data'
+copy tab_progress_reporting from :'filename'
 	where (salary < 2000);
 INFO:  progress: {"type": "FILE", "command": "COPY FROM", "relname": "tab_progress_reporting", "has_bytes_total": true, "tuples_excluded": 1, "tuples_processed": 2, "has_bytes_processed": true}
 drop trigger check_after_tab_progress_reporting on tab_progress_reporting;
diff --git a/src/test/regress/output/create_function_0.source b/src/test/regress/output/create_function_0.source
index 342bc40e115..6e96d6c5d66 100644
--- a/src/test/regress/output/create_function_0.source
+++ b/src/test/regress/output/create_function_0.source
@@ -1,57 +1,63 @@
 --
 -- CREATE_FUNCTION_0
 --
+-- directory path and dlsuffix are passed to us in environment variables
+\getenv libdir PG_LIBDIR
+\getenv dlsuffix PG_DLSUFFIX
+\set autoinclib :libdir '/autoinc' :dlsuffix
+\set refintlib :libdir '/refint' :dlsuffix
+\set regresslib :libdir '/regress' :dlsuffix
 -- Create a bunch of C functions that will be used by later tests:
 CREATE FUNCTION check_primary_key ()
 	RETURNS trigger
-	AS '@libdir@/refint@DLSUFFIX@'
+	AS :'refintlib'
 	LANGUAGE C;
 CREATE FUNCTION check_foreign_key ()
 	RETURNS trigger
-	AS '@libdir@/refint@DLSUFFIX@'
+	AS :'refintlib'
 	LANGUAGE C;
 CREATE FUNCTION autoinc ()
 	RETURNS trigger
-	AS '@libdir@/autoinc@DLSUFFIX@'
+	AS :'autoinclib'
 	LANGUAGE C;
 CREATE FUNCTION trigger_return_old ()
         RETURNS trigger
-        AS '@libdir@/regress@DLSUFFIX@'
+        AS :'regresslib'
         LANGUAGE C;
 CREATE FUNCTION ttdummy ()
         RETURNS trigger
-        AS '@libdir@/regress@DLSUFFIX@'
+        AS :'regresslib'
         LANGUAGE C;
 CREATE FUNCTION set_ttdummy (int4)
         RETURNS int4
-        AS '@libdir@/regress@DLSUFFIX@'
+        AS :'regresslib'
         LANGUAGE C STRICT;
 CREATE FUNCTION make_tuple_indirect (record)
         RETURNS record
-        AS '@libdir@/regress@DLSUFFIX@'
+        AS :'regresslib'
         LANGUAGE C STRICT;
 CREATE FUNCTION test_atomic_ops()
     RETURNS bool
-    AS '@libdir@/regress@DLSUFFIX@'
+    AS :'regresslib'
     LANGUAGE C;
 CREATE FUNCTION test_fdw_handler()
     RETURNS fdw_handler
-    AS '@libdir@/regress@DLSUFFIX@', 'test_fdw_handler'
+    AS :'regresslib', 'test_fdw_handler'
     LANGUAGE C;
 CREATE FUNCTION test_support_func(internal)
     RETURNS internal
-    AS '@libdir@/regress@DLSUFFIX@', 'test_support_func'
+    AS :'regresslib', 'test_support_func'
     LANGUAGE C STRICT;
 CREATE FUNCTION test_opclass_options_func(internal)
     RETURNS void
-    AS '@libdir@/regress@DLSUFFIX@', 'test_opclass_options_func'
+    AS :'regresslib', 'test_opclass_options_func'
     LANGUAGE C;
 CREATE FUNCTION test_enc_conversion(bytea, name, name, bool, validlen OUT int, result OUT bytea)
-    AS '@libdir@/regress@DLSUFFIX@', 'test_enc_conversion'
+    AS :'regresslib', 'test_enc_conversion'
     LANGUAGE C STRICT;
 CREATE FUNCTION binary_coercible(oid, oid)
     RETURNS bool
-    AS '@libdir@/regress@DLSUFFIX@', 'binary_coercible'
+    AS :'regresslib', 'binary_coercible'
     LANGUAGE C STRICT STABLE PARALLEL SAFE;
 -- Things that shouldn't work:
 CREATE FUNCTION test1 (int) RETURNS int LANGUAGE SQL
@@ -80,9 +86,19 @@ ERROR:  only one AS item needed for language "sql"
 CREATE FUNCTION test1 (int) RETURNS int LANGUAGE C
     AS 'nosuchfile';
 ERROR:  could not access file "nosuchfile": No such file or directory
+-- To produce stable regression test output, we have to filter the name
+-- of the regresslib file out of the error message in this test.
+\set VERBOSITY sqlstate
 CREATE FUNCTION test1 (int) RETURNS int LANGUAGE C
-    AS '@libdir@/regress@DLSUFFIX@', 'nosuchsymbol';
-ERROR:  could not find function "nosuchsymbol" in file "@libdir@/regress@DLSUFFIX@"
+    AS :'regresslib', 'nosuchsymbol';
+ERROR:  42883
+\set VERBOSITY default
+SELECT regexp_replace(:'LAST_ERROR_MESSAGE', 'file ".*"', 'file "..."');
+                    regexp_replace                    
+------------------------------------------------------
+ could not find function "nosuchsymbol" in file "..."
+(1 row)
+
 CREATE FUNCTION test1 (int) RETURNS int LANGUAGE internal
     AS 'nosuch';
 ERROR:  there is no built-in function named "nosuch"
diff --git a/src/test/regress/output/create_function_1.source b/src/test/regress/output/create_function_1.source
index 616b610e862..5345ed08400 100644
--- a/src/test/regress/output/create_function_1.source
+++ b/src/test/regress/output/create_function_1.source
@@ -1,26 +1,30 @@
 --
 -- CREATE_FUNCTION_1
 --
+-- directory path and dlsuffix are passed to us in environment variables
+\getenv libdir PG_LIBDIR
+\getenv dlsuffix PG_DLSUFFIX
+\set regresslib :libdir '/regress' :dlsuffix
 -- Create C functions needed by create_type.sql
 CREATE FUNCTION widget_in(cstring)
    RETURNS widget
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT IMMUTABLE;
 NOTICE:  type "widget" is not yet defined
 DETAIL:  Creating a shell type definition.
 CREATE FUNCTION widget_out(widget)
    RETURNS cstring
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT IMMUTABLE;
 NOTICE:  argument type widget is only a shell
 CREATE FUNCTION int44in(cstring)
    RETURNS city_budget
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT IMMUTABLE;
 NOTICE:  type "city_budget" is not yet defined
 DETAIL:  Creating a shell type definition.
 CREATE FUNCTION int44out(city_budget)
    RETURNS cstring
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT IMMUTABLE;
 NOTICE:  argument type city_budget is only a shell
diff --git a/src/test/regress/output/create_function_2.source b/src/test/regress/output/create_function_2.source
index ac9a7f5cf8d..a366294add7 100644
--- a/src/test/regress/output/create_function_2.source
+++ b/src/test/regress/output/create_function_2.source
@@ -1,6 +1,10 @@
 --
 -- CREATE_FUNCTION_2
 --
+-- directory path and dlsuffix are passed to us in environment variables
+\getenv libdir PG_LIBDIR
+\getenv dlsuffix PG_DLSUFFIX
+\set regresslib :libdir '/regress' :dlsuffix
 CREATE FUNCTION hobbies(person)
    RETURNS setof hobbies_r
    AS 'select * from hobbies_r where person = $1.name'
@@ -49,21 +53,21 @@ CREATE FUNCTION equipment_named_ambiguous_2b(hobby text)
    LANGUAGE SQL;
 CREATE FUNCTION pt_in_widget(point, widget)
    RETURNS bool
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT;
 CREATE FUNCTION overpaid(emp)
    RETURNS bool
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT;
 CREATE FUNCTION interpt_pp(path, path)
    RETURNS point
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT;
 CREATE FUNCTION reverse_name(name)
    RETURNS name
-   AS '@libdir@/regress@DLSUFFIX@'
+   AS :'regresslib'
    LANGUAGE C STRICT;
 --
 -- Function dynamic loading
 --
-LOAD '@libdir@/regress@DLSUFFIX@';
+LOAD :'regresslib';
diff --git a/src/test/regress/output/largeobject.source b/src/test/regress/output/largeobject.source
index 91d33b4d0c7..f461ca3b9f4 100644
--- a/src/test/regress/output/largeobject.source
+++ b/src/test/regress/output/largeobject.source
@@ -1,6 +1,9 @@
 --
 -- Test large object support
 --
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
 -- ensure consistent test output regardless of the default bytea format
 SET bytea_output TO escape;
 -- Load a file
@@ -161,16 +164,13 @@ SELECT lo_open(loid, x'40000'::int) from lotest_stash_values;
 (1 row)
 
 ABORT;
-DO $$
-DECLARE
-  loid oid;
-BEGIN
-  SELECT tbl.loid INTO loid FROM lotest_stash_values tbl;
-  PERFORM lo_export(loid, '@abs_builddir@/results/invalid/path');
-EXCEPTION
-  WHEN UNDEFINED_FILE THEN RAISE NOTICE 'could not open file, as expected';
-END;
-$$;
+\set filename :abs_builddir '/results/invalid/path'
+\set dobody 'DECLARE loid oid; BEGIN '
+\set dobody :dobody 'SELECT tbl.loid INTO loid FROM lotest_stash_values tbl; '
+\set dobody :dobody 'PERFORM lo_export(loid, ' :'filename' '); '
+\set dobody :dobody 'EXCEPTION WHEN UNDEFINED_FILE THEN '
+\set dobody :dobody 'RAISE NOTICE ''could not open file, as expected''; END'
+DO :'dobody';
 NOTICE:  could not open file, as expected
 -- Test truncation.
 BEGIN;
@@ -327,7 +327,8 @@ SELECT lo_unlink(loid) from lotest_stash_values;
 (1 row)
 
 TRUNCATE lotest_stash_values;
-INSERT INTO lotest_stash_values (loid) SELECT lo_import('@abs_srcdir@/data/tenk.data');
+\set filename :abs_srcdir '/data/tenk.data'
+INSERT INTO lotest_stash_values (loid) SELECT lo_import(:'filename');
 BEGIN;
 UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
 -- verify length of large object
@@ -390,16 +391,18 @@ SELECT lo_close(fd) FROM lotest_stash_values;
 (1 row)
 
 END;
-SELECT lo_export(loid, '@abs_builddir@/results/lotest.txt') FROM lotest_stash_values;
+\set filename :abs_builddir '/results/lotest.txt'
+SELECT lo_export(loid, :'filename') FROM lotest_stash_values;
  lo_export 
 -----------
          1
 (1 row)
 
-\lo_import '@abs_builddir@/results/lotest.txt'
+\lo_import :filename
 \set newloid :LASTOID
 -- just make sure \lo_export does not barf
-\lo_export :newloid '@abs_builddir@/results/lotest2.txt'
+\set filename :abs_builddir '/results/lotest2.txt'
+\lo_export :newloid :filename
 -- This is a hack to test that export/import are reversible
 -- This uses knowledge about the inner workings of large object mechanism
 -- which should not be used outside it.  This makes it a HACK
@@ -418,7 +421,8 @@ SELECT lo_unlink(loid) FROM lotest_stash_values;
 
 TRUNCATE lotest_stash_values;
 \lo_unlink :newloid
-\lo_import '@abs_builddir@/results/lotest.txt'
+\set filename :abs_builddir '/results/lotest.txt'
+\lo_import :filename
 \set newloid_1 :LASTOID
 SELECT lo_from_bytea(0, lo_get(:newloid_1)) AS newloid_2
 \gset
diff --git a/src/test/regress/output/largeobject_1.source b/src/test/regress/output/largeobject_1.source
index cb910e2eefd..a9725c375d5 100644
--- a/src/test/regress/output/largeobject_1.source
+++ b/src/test/regress/output/largeobject_1.source
@@ -1,6 +1,9 @@
 --
 -- Test large object support
 --
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
 -- ensure consistent test output regardless of the default bytea format
 SET bytea_output TO escape;
 -- Load a file
@@ -161,16 +164,13 @@ SELECT lo_open(loid, x'40000'::int) from lotest_stash_values;
 (1 row)
 
 ABORT;
-DO $$
-DECLARE
-  loid oid;
-BEGIN
-  SELECT tbl.loid INTO loid FROM lotest_stash_values tbl;
-  PERFORM lo_export(loid, '@abs_builddir@/results/invalid/path');
-EXCEPTION
-  WHEN UNDEFINED_FILE THEN RAISE NOTICE 'could not open file, as expected';
-END;
-$$;
+\set filename :abs_builddir '/results/invalid/path'
+\set dobody 'DECLARE loid oid; BEGIN '
+\set dobody :dobody 'SELECT tbl.loid INTO loid FROM lotest_stash_values tbl; '
+\set dobody :dobody 'PERFORM lo_export(loid, ' :'filename' '); '
+\set dobody :dobody 'EXCEPTION WHEN UNDEFINED_FILE THEN '
+\set dobody :dobody 'RAISE NOTICE ''could not open file, as expected''; END'
+DO :'dobody';
 NOTICE:  could not open file, as expected
 -- Test truncation.
 BEGIN;
@@ -327,7 +327,8 @@ SELECT lo_unlink(loid) from lotest_stash_values;
 (1 row)
 
 TRUNCATE lotest_stash_values;
-INSERT INTO lotest_stash_values (loid) SELECT lo_import('@abs_srcdir@/data/tenk.data');
+\set filename :abs_srcdir '/data/tenk.data'
+INSERT INTO lotest_stash_values (loid) SELECT lo_import(:'filename');
 BEGIN;
 UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
 -- verify length of large object
@@ -390,16 +391,18 @@ SELECT lo_close(fd) FROM lotest_stash_values;
 (1 row)
 
 END;
-SELECT lo_export(loid, '@abs_builddir@/results/lotest.txt') FROM lotest_stash_values;
+\set filename :abs_builddir '/results/lotest.txt'
+SELECT lo_export(loid, :'filename') FROM lotest_stash_values;
  lo_export 
 -----------
          1
 (1 row)
 
-\lo_import '@abs_builddir@/results/lotest.txt'
+\lo_import :filename
 \set newloid :LASTOID
 -- just make sure \lo_export does not barf
-\lo_export :newloid '@abs_builddir@/results/lotest2.txt'
+\set filename :abs_builddir '/results/lotest2.txt'
+\lo_export :newloid :filename
 -- This is a hack to test that export/import are reversible
 -- This uses knowledge about the inner workings of large object mechanism
 -- which should not be used outside it.  This makes it a HACK
@@ -418,7 +421,8 @@ SELECT lo_unlink(loid) FROM lotest_stash_values;
 
 TRUNCATE lotest_stash_values;
 \lo_unlink :newloid
-\lo_import '@abs_builddir@/results/lotest.txt'
+\set filename :abs_builddir '/results/lotest.txt'
+\lo_import :filename
 \set newloid_1 :LASTOID
 SELECT lo_from_bytea(0, lo_get(:newloid_1)) AS newloid_2
 \gset
diff --git a/src/test/regress/output/misc.source b/src/test/regress/output/misc.source
index b9595cc2391..dd65e6ed62f 100644
--- a/src/test/regress/output/misc.source
+++ b/src/test/regress/output/misc.source
@@ -1,6 +1,9 @@
 --
 -- MISC
 --
+-- directory paths are passed to us in environment variables
+\getenv abs_srcdir PG_ABS_SRCDIR
+\getenv abs_builddir PG_ABS_BUILDDIR
 --
 -- BTREE
 --
@@ -41,9 +44,10 @@ DROP TABLE tmp;
 --
 -- copy
 --
-COPY onek TO '@abs_builddir@/results/onek.data';
+\set filename :abs_builddir '/results/onek.data'
+COPY onek TO :'filename';
 DELETE FROM onek;
-COPY onek FROM '@abs_builddir@/results/onek.data';
+COPY onek FROM :'filename';
 SELECT unique1 FROM onek WHERE unique1 < 2 ORDER BY unique1;
  unique1 
 ---------
@@ -52,7 +56,7 @@ SELECT unique1 FROM onek WHERE unique1 < 2 ORDER BY unique1;
 (2 rows)
 
 DELETE FROM onek2;
-COPY onek2 FROM '@abs_builddir@/results/onek.data';
+COPY onek2 FROM :'filename';
 SELECT unique1 FROM onek2 WHERE unique1 < 2 ORDER BY unique1;
  unique1 
 ---------
@@ -60,9 +64,10 @@ SELECT unique1 FROM onek2 WHERE unique1 < 2 ORDER BY unique1;
        1
 (2 rows)
 
-COPY BINARY stud_emp TO '@abs_builddir@/results/stud_emp.data';
+\set filename :abs_builddir '/results/stud_emp.data'
+COPY BINARY stud_emp TO :'filename';
 DELETE FROM stud_emp;
-COPY BINARY stud_emp FROM '@abs_builddir@/results/stud_emp.data';
+COPY BINARY stud_emp FROM :'filename';
 SELECT * FROM stud_emp;
  name  | age |  location  | salary | manager | gpa | percent 
 -------+-----+------------+--------+---------+-----+---------
diff --git a/src/test/regress/output/tablespace.source b/src/test/regress/output/tablespace.source
index 1bbe7e03236..864f4b6e208 100644
--- a/src/test/regress/output/tablespace.source
+++ b/src/test/regress/output/tablespace.source
@@ -1,7 +1,10 @@
+-- directory paths are passed to us in environment variables
+\getenv abs_builddir PG_ABS_BUILDDIR
+\set testtablespace :abs_builddir '/testtablespace'
 -- create a tablespace using WITH clause
-CREATE TABLESPACE regress_tblspacewith LOCATION '@testtablespace@' WITH (some_nonexistent_parameter = true); -- fail
+CREATE TABLESPACE regress_tblspacewith LOCATION :'testtablespace' WITH (some_nonexistent_parameter = true); -- fail
 ERROR:  unrecognized parameter "some_nonexistent_parameter"
-CREATE TABLESPACE regress_tblspacewith LOCATION '@testtablespace@' WITH (random_page_cost = 3.0); -- ok
+CREATE TABLESPACE regress_tblspacewith LOCATION :'testtablespace' WITH (random_page_cost = 3.0); -- ok
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
        spcoptions       
@@ -12,7 +15,7 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- create a tablespace we can use
-CREATE TABLESPACE regress_tblspace LOCATION '@testtablespace@';
+CREATE TABLESPACE regress_tblspace LOCATION :'testtablespace';
 -- try setting and resetting some properties for the new tablespace
 ALTER TABLESPACE regress_tblspace SET (random_page_cost = 1.0, seq_page_cost = 1.1);
 ALTER TABLESPACE regress_tblspace SET (some_nonexistent_parameter = true);  -- fail
diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index 2c8a600bad1..c2fcff55bfb 100644
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -746,6 +746,14 @@ initialize_environment(void)
 	 */
 	setenv("PGAPPNAME", "pg_regress", 1);
 
+	/*
+	 * Set variables that the test scripts may need to refer to.
+	 */
+	setenv("PG_ABS_SRCDIR", inputdir, 1);
+	setenv("PG_ABS_BUILDDIR", outputdir, 1);
+	setenv("PG_LIBDIR", dlpath, 1);
+	setenv("PG_DLSUFFIX", DLSUFFIX, 1);
+
 	if (nolocale)
 	{
 		/*