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Proper test for link-time optimizations.

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This commit is contained in:
Dianne Skoll
2025-10-29 13:44:55 -04:00
parent a6144baff7
commit 9642303d05
2 changed files with 12 additions and 4 deletions
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8
configure.ac
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@@ -50,6 +50,7 @@ U="`uname -s`"
if test "$U" != "SunOS" -a "$GCC" = yes; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
# Check for link-time optimization support
OLDCFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -flto=auto"
AC_MSG_CHECKING([whether $CC supports -flto=auto])
AC_LINK_IFELSE(
@@ -61,9 +62,10 @@ if test "$U" != "SunOS" -a "$GCC" = yes; then
)
AC_MSG_RESULT([$lto])
if test "x$lto" != "xyes" ; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
CFLAGS="$OLDCFLAGS"
else
AC_MSG_CHECKING([whether $CC supports -ffat-lto-object])
OLDCFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror -ffat-lto-objects"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
@@ -74,7 +76,9 @@ if test "$U" != "SunOS" -a "$GCC" = yes; then
)
AC_MSG_RESULT([$lto])
if test "x$lto" != "xyes" ; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes -flto=auto"
CFLAGS="$OLDCFLAGS"
else
CFLAGS="$OLDCFLAGS -ffat-lto-objects"
fi
fi
fi