diff options
| author | Glenn Morris <[email protected]> | 2014-06-21 12:45:59 -0700 |
|---|---|---|
| committer | Glenn Morris <[email protected]> | 2014-06-21 12:45:59 -0700 |
| commit | c400516ab1d827d08225ffb3e1bc1969c73cc45e (patch) | |
| tree | b16343b9e11c916c96b12ab56b6024cad91d3aff /configure.ac | |
| parent | 539ad293eb36b4cf458cbdb5a6b37f5cd1bb68a1 (diff) | |
| parent | 8047f439ec7d0bbe0085800a13bee8da883ae4dd (diff) | |
Merge from emacs-24; up to 2014-06-06T02:22:[email protected]
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index c4ca395d6d..b253d2465f 100644 --- a/configure.ac +++ b/configure.ac @@ -931,8 +931,11 @@ edit_cflags=" AC_ARG_ENABLE(link-time-optimization, [AS_HELP_STRING([--enable-link-time-optimization], [build emacs with link-time optimization. - This is supported for gcc since 4.5.0 and clang. - Note that clang support is experimental - see INSTALL])], + This requires GCC 4.5.0 or later, or clang. + (Note that clang support is experimental - see INSTALL.) + It also makes Emacs harder to debug, and when we tried it + with GCC 4.9.0 x86-64 it made Emacs slower, so it's not + recommended for typical use.])], if test "${enableval}" != "no"; then ac_lto_supported=no if test $emacs_cv_clang = yes; then @@ -970,6 +973,13 @@ if test "${enableval}" != "no"; then # command, so plugin name is appended to ARFLAGS. ARFLAGS="cru --plugin $GOLD_PLUGIN" RANLIB="$RANLIB --plugin $GOLD_PLUGIN" + else + dnl The following is needed for GCC 4.9.0. The GCC 4.9.0 release notes + dnl suggest that instead of -ffat-lto-objects we should use gcc-ar and + dnl gcc-ranlib in place of ar and ranlib, but gcc-ar makes /usr/bin/ar + dnl dump core on Fedora 20, so play it safe for now. + gl_COMPILER_OPTION_IF([-ffat-lto-objects], + [CFLAGS="$CFLAGS -ffat-lto-objects"]) fi fi fi) |