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| author | Andres Freund <andres@anarazel.de> | 2017-12-12 17:19:44 -0800 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2017-12-12 17:21:37 -0800 |
| commit | 85abb5b297c5b318738f09345ae226f780b88e92 (patch) | |
| tree | e33fb6c2ab78a2294e31ed84e064a943b38221b8 /config/c-compiler.m4 | |
| parent | 101c7ee3ee847bac970c74b73b4f2858484383e5 (diff) | |
| download | postgresql-85abb5b297c5b318738f09345ae226f780b88e92.tar.gz | |
Make PGAC_C_BUILTIN_OP_OVERFLOW link instead of just compiling.
Otherwise the detection can spuriously detect symbol as available,
because the compiler may just emits reference to non-existant symbol.
Diffstat (limited to 'config/c-compiler.m4')
| -rw-r--r-- | config/c-compiler.m4 | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/config/c-compiler.m4 b/config/c-compiler.m4 index 28c372cd32..ed26644a48 100644 --- a/config/c-compiler.m4 +++ b/config/c-compiler.m4 @@ -305,10 +305,11 @@ fi])# PGAC_C_BUILTIN_CONSTANT_P # and define HAVE__BUILTIN_OP_OVERFLOW if so. # # Check for the most complicated case, 64 bit multiplication, as a -# proxy for all of the operations. +# proxy for all of the operations. Have to link to be sure to +# recognize a missing __builtin_mul_overflow. AC_DEFUN([PGAC_C_BUILTIN_OP_OVERFLOW], [AC_CACHE_CHECK(for __builtin_mul_overflow, pgac_cv__builtin_op_overflow, -[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], +[AC_LINK_IFELSE([AC_LANG_PROGRAM([], [PG_INT64_TYPE result; __builtin_mul_overflow((PG_INT64_TYPE) 1, (PG_INT64_TYPE) 2, &result);] )], |