From 4fecbe59dadaed314b792ed35ef5dc24c7047a18 Mon Sep 17 00:00:00 2001 From: "Jan Alexander Steffens (heftig)" Date: Thu, 16 Jul 2015 15:27:57 +0200 Subject: build-sys: Use slim LTO objects if possible While 235c6e6 gets LTO builds running again, it goes back to using fat LTO objects instead of using gcc-{ar,nm,ranlib}. Building these fat objects takes significantly more time. Use the suggested solution and look for gcc-{ar,nm,ranlib}, which launch the binutils tools with the appropriate --plugin parameter. GCC versions that do not ship these should either default to -ffat-lto-objects or do not support LTO at all. On another note, nm from binutils 2.25 seems to be smart enough to load the LTO plugin when needed without having to specify --plugin. --- configure.ac | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index 999f9f84d3..724a3f3428 100644 --- a/configure.ac +++ b/configure.ac @@ -38,6 +38,11 @@ AM_INIT_AUTOMAKE([foreign 1.11 -Wall -Wno-portability silent-rules tar-pax no-di AM_SILENT_RULES([yes]) AC_CANONICAL_HOST AC_DEFINE_UNQUOTED([CANONICAL_HOST], "$host", [Canonical host string.]) + +AC_CHECK_TOOLS([AR], [gcc-ar ar], [:]) +AC_CHECK_TOOLS([NM], [gcc-nm nm], [:]) +AC_CHECK_TOOLS([RANLIB], [gcc-ranlib ranlib], [:]) + LT_PREREQ(2.2) LT_INIT([disable-static]) @@ -196,7 +201,7 @@ AS_CASE([$CC], [*clang*], AS_CASE([$CFLAGS], [*-O[[12345sz\ ]]*], [CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\ - -flto -ffat-lto-objects])], + -flto])], [AC_MSG_RESULT([skipping -flto, optimization not enabled])]) AC_SUBST([OUR_CFLAGS], "$with_cflags $sanitizer_cflags") -- cgit v1.2.3-54-g00ecf