diff options
| -rwxr-xr-x | configure | 33 | ||||
| -rw-r--r-- | configure.in | 18 |
2 files changed, 51 insertions, 0 deletions
diff --git a/configure b/configure index 4b91f2a6f6f..049fbcaaa0c 100755 --- a/configure +++ b/configure @@ -5119,6 +5119,39 @@ fi rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext fi +# Defend against clang being used on x86-32 without SSE2 enabled. As current +# versions of clang do not understand -fexcess-precision=standard, the use of +# x87 floating point operations leads to problems like isinf possibly returning +# false for a value that is infinite when converted from the 80bit register to +# the 8byte memory representation. +# +# Only perform the test if the compiler doesn't understand +# -fexcess-precision=standard, that way a potentially fixed compiler will work +# automatically. +if test "$pgac_cv_prog_cc_cflags__fexcess_precision_standard" = no; then +cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ + +int +main () +{ + +#if defined(__clang__) && defined(__i386__) && !defined(__SSE2_MATH__) +choke me +#endif + + ; + return 0; +} +_ACEOF +if ac_fn_c_try_compile "$LINENO"; then : + +else + as_fn_error $? "Compiling PostgreSQL with clang, on 32bit x86, requires SSE2 support. Use -msse2 or use gcc." "$LINENO" 5 +fi +rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext +fi + ac_ext=c ac_cpp='$CPP $CPPFLAGS' ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' diff --git a/configure.in b/configure.in index c2751e5cc87..efd96bcc479 100644 --- a/configure.in +++ b/configure.in @@ -531,6 +531,24 @@ choke me @%:@endif], [], [AC_MSG_ERROR([do not put -ffast-math in CFLAGS])]) fi +# Defend against clang being used on x86-32 without SSE2 enabled. As current +# versions of clang do not understand -fexcess-precision=standard, the use of +# x87 floating point operations leads to problems like isinf possibly returning +# false for a value that is infinite when converted from the 80bit register to +# the 8byte memory representation. +# +# Only perform the test if the compiler doesn't understand +# -fexcess-precision=standard, that way a potentially fixed compiler will work +# automatically. +if test "$pgac_cv_prog_cc_cflags__fexcess_precision_standard" = no; then +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [ +@%:@if defined(__clang__) && defined(__i386__) && !defined(__SSE2_MATH__) +choke me +@%:@endif +])], [], +[AC_MSG_ERROR([Compiling PostgreSQL with clang, on 32bit x86, requires SSE2 support. Use -msse2 or use gcc.])]) +fi + AC_PROG_CPP AC_SUBST(GCC) |