There is a bug in GCC LTO such that it ignores assembler directives. This patch makes LTO enabled by default but also allows it to be disabled if required.
See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47785 Ray Kinsella --- configure.ac | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/configure.ac b/configure.ac index 999f9f8..294c440 100644 --- a/configure.ac +++ b/configure.ac @@ -194,11 +194,18 @@ AS_CASE([$CC], [*clang*], -Wno-gnu-variable-sized-type-not-at-end \ ])]) -AS_CASE([$CFLAGS], [*-O[[12345sz\ ]]*], - [CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\ - -flto -ffat-lto-objects])], - [AC_MSG_RESULT([skipping -flto, optimization not enabled])]) -AC_SUBST([OUR_CFLAGS], "$with_cflags $sanitizer_cflags") +AC_ARG_ENABLE(lto, + [AS_HELP_STRING([--enable-lto], [Enable link time optimization])], + enable_lto=$enableval, + enable_lto=yes; default_enable_lto=yes) + +if test "x$enable_lto" != "xno"; then + AS_CASE([$CFLAGS], [*-O[[12345sz\ ]]*], + [CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\ + -flto -ffat-lto-objects])], + [AC_MSG_RESULT([skipping -flto, optimization not enabled])]) + AC_SUBST([OUR_CFLAGS], "$with_cflags $sanitizer_cflags") +fi AS_CASE([$CFLAGS], [*-O[[12345sz\ ]]*], [CC_CHECK_FLAGS_APPEND([with_cppflags], [CPPFLAGS], [\ -- 2.1.0 _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
