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Issue #24543: Use AC_LINK instead of AC_COMPILE in order to prevent false 

positives with the -flto option (gcc >= 4.9.0 and clang).
This commit is contained in:
Stefan Krah 2015-07-03 15:30:54 +02:00
parent d048003d90
commit 99e36b9a84
2 changed files with 4 additions and 3 deletions
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5
configure vendored
View File

@ -12747,12 +12747,13 @@ main ()
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
if ac_fn_c_try_link "$LINENO"; then :
have_gcc_asm_for_x87=yes
else
have_gcc_asm_for_x87=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_gcc_asm_for_x87" >&5
$as_echo "$have_gcc_asm_for_x87" >&6; }
if test "$have_gcc_asm_for_x87" = yes

2
configure.ac
View File

@ -3723,7 +3723,7 @@ fi
# so we try it on all platforms.
AC_MSG_CHECKING(whether we can use gcc inline assembler to get and set x87 control word)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[
unsigned short cw;
__asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
__asm__ __volatile__ ("fldcw %0" : : "m" (cw));