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Make PGAC_C_BUILTIN_OP_OVERFLOW link instead of just compiling.

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Otherwise the detection can spuriously detect symbol as available,
because the compiler may just emits reference to non-existant symbol.
This commit is contained in:
Andres Freund
2017-12-12 17:19:44 -08:00
parent 101c7ee3ee
commit 85abb5b297
2 changed files with 8 additions and 4 deletions
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5
config/c-compiler.m4
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@ -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);]
)],