meson: libpq: Revise static / shared library setup

Improvements:
- we don't need -DFRONTEND for libpq anymore since 1d77afefbd1
- the .pc file contents for a static libpq were wrong (referencing
  {pgport, common}_shlib)
- incidentally fixes meson not supporting link_whole on AIX yet
- added explanatory comments

Previously I tried to avoid building libpq's sources twice, once for the
static and once for the shared library. We could still do so, but it's not
clear that it's worth the complication.

Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>

2 files changed, 36 insertions, 15 deletions

diff --git a/meson.build b/meson.build
index 253994931e8..c709643fe5e 100644
--- a/meson.build
+++ b/meson.build
@@ -2619,17 +2619,29 @@ backend_common_code = declare_dependency(
 
 subdir('src/common')
 
-frontend_shlib_code = declare_dependency(
-  compile_args: ['-DFRONTEND'],
-  include_directories: [postgres_inc],
+# all shared libraries should depend on shlib_code
+shlib_code = declare_dependency(
   link_args: ldflags_sl,
-  link_with: [pgport_shlib, common_shlib],
+)
+
+# all static libraries not part of the backend should depend on this
+frontend_stlib_code = declare_dependency(
+  include_directories: [postgres_inc],
+  link_with: [common_static, pgport_static],
   sources: generated_headers,
   dependencies: [os_deps, libintl],
 )
 
+# all shared libraries not part of the backend should depend on this
+frontend_shlib_code = declare_dependency(
+  include_directories: [postgres_inc],
+  link_with: [common_shlib, pgport_shlib],
+  sources: generated_headers,
+  dependencies: [shlib_code, os_deps, libintl],
+)
+
+# Dependencies both for static and shared libpq
 libpq_deps += [
-  frontend_shlib_code,
   thread_dep,
 
   gssapi,
@@ -2642,6 +2654,7 @@ subdir('src/interfaces/libpq')
 # fe_utils depends on libpq
 subdir('src/fe_utils')
 
+# for frontend binaries
 frontend_code = declare_dependency(
   include_directories: [postgres_inc],
   link_with: [fe_utils, common_static, pgport_static],
diff --git a/src/interfaces/libpq/meson.build b/src/interfaces/libpq/meson.build
index bc047e00d62..34cb58c2617 100644
--- a/src/interfaces/libpq/meson.build
+++ b/src/interfaces/libpq/meson.build
@@ -39,26 +39,33 @@ export_file = custom_target('libpq.exports',
 
 # port needs to be in include path due to pthread-win32.h
 libpq_inc = include_directories('.', '../../port')
+libpq_c_args = ['-DSO_MAJOR_VERSION=5']
 
+# Not using both_libraries() here as
+# 1) resource files should only be in the shared library
+# 2) we want the .pc file to include a dependency to {pgport,common}_static for
+#    libpq_st, and {pgport,common}_shlib for libpq_sh
+#
+# We could try to avoid building the source files twice, but it probably adds
+# more complexity than its worth (AIX doesn't support link_whole yet, reusing
+# object files requires also linking to the library on windows or breaks
+# precompiled headers).
 libpq_st = static_library('libpq',
   libpq_sources,
-  pic: true,
-  include_directories: [libpq_inc, postgres_inc],
-  c_args: ['-DSO_MAJOR_VERSION=5'],
-  dependencies: libpq_deps,
+  include_directories: [libpq_inc],
+  c_args: libpq_c_args,
+  dependencies: [frontend_stlib_code, libpq_deps],
   kwargs: default_lib_args,
 )
 
-# not using both_libraries here, causes problems with precompiled headers and
-# resource files with msbuild
 libpq_so = shared_library('libpq',
-  dependencies: libpq_deps,
+  libpq_sources,
   include_directories: [libpq_inc, postgres_inc],
-  c_args: ['-DSO_MAJOR_VERSION=5'],
-  link_whole: libpq_st,
+  c_args: libpq_c_args,
   version: '5.' + pg_version_major.to_string(),
   soversion: host_system != 'windows' ? '5' : '',
   darwin_versions: ['5', '5.' + pg_version_major.to_string()],
+  dependencies: [frontend_shlib_code, libpq_deps],
   link_depends: export_file,
   link_args: export_fmt.format(export_file.full_path()),
   kwargs: default_lib_args,
@@ -70,10 +77,11 @@ libpq = declare_dependency(
 )
 
 pkgconfig.generate(
-  libpq_so,
   name: 'libpq',
   description: 'PostgreSQL libpq library',
   url: pg_url,
+  libraries: libpq,
+  libraries_private: [frontend_stlib_code, libpq_deps],
 )
 
 install_headers(