diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 3ada48b5f95..2e60a89502c 100644 --- a/configure.in +++ b/configure.in @@ -624,6 +624,24 @@ 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) |