From: Robert Edmonds <[email protected]>
This allows link-time optimization to be disabled if --disable-flto is
passed to configure. This might be useful if LTO is broken on the build
architecture, or to speed up the build during development.
---
acx_nlnetlabs.m4 | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/acx_nlnetlabs.m4 b/acx_nlnetlabs.m4
index e393817..c288c35 100644
--- a/acx_nlnetlabs.m4
+++ b/acx_nlnetlabs.m4
@@ -407,19 +407,22 @@ int test() {
dnl Check if CC supports -flto.
dnl in a way that supports clang and suncc (that flag does something else,
dnl but fails to link). It sets it in CFLAGS if it works.
-AC_DEFUN([ACX_CHECK_FLTO],
-[AC_MSG_CHECKING([if $CC supports -flto])
-BAKCFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS -flto"
-AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
- if $CC $CFLAGS -o conftest conftest.c 2>&1 | grep "warning: no debug
symbols in executable" >/dev/null; then
- CFLAGS="$BAKCFLAGS"
- AC_MSG_RESULT(no)
- else
- AC_MSG_RESULT(yes)
- fi
- rm -f conftest conftest.c conftest.o
-], [CFLAGS="$BAKCFLAGS" ; AC_MSG_RESULT(no)])
+AC_DEFUN([ACX_CHECK_FLTO], [
+ AC_ARG_ENABLE([flto], AS_HELP_STRING([--disable-flto], [Disable link-time
optimization]))
+ AS_IF([test "x$enable_flto" != "xno"], [
+ AC_MSG_CHECKING([if $CC supports -flto])
+ BAKCFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -flto"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
+ if $CC $CFLAGS -o conftest conftest.c 2>&1 | grep "warning: no
debug symbols in executable" >/dev/null; then
+ CFLAGS="$BAKCFLAGS"
+ AC_MSG_RESULT(no)
+ else
+ AC_MSG_RESULT(yes)
+ fi
+ rm -f conftest conftest.c conftest.o
+ ], [CFLAGS="$BAKCFLAGS" ; AC_MSG_RESULT(no)])
+ ])
])
dnl Check the printf-format attribute (if any)
--
1.8.3.rc1
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