Add feature --enable-lto, link-time optimization.
Enabling link-time optimization turns debug information off (-g),
sine -flto and -g does not currently well work together.
Also stdlib-debug is turned off, does also not work well with -flto.
---
config/lyxinclude.m4 | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/config/lyxinclude.m4 b/config/lyxinclude.m4
index 2e529ea..67aea1f 100644
--- a/config/lyxinclude.m4
+++ b/config/lyxinclude.m4
@@ -236,6 +236,24 @@ AC_ARG_ENABLE(cxx11,
AC_HELP_STRING([--enable-cxx11],[enable C++11 mode]),,
enable_cxx11=no;)
+AC_ARG_ENABLE(lto,
+ AC_HELP_STRING([--enable-lto],[enable link time optimization]),,
+ enable_lto=no;)
+case $enable_lto in
+ yes)
+ lto_opt=-flto
+ enable_debug=no
+ enable_stdlib_debug=no
+ ;;
+ no)
+ lto_opt=;;
+ *)
+ lto_opt="-flto=${enable_lto}"
+ enable_debug=no
+ enable_stdlib_debug=no
+ ;;
+esac
+
AC_ARG_ENABLE(assertions,
AC_HELP_STRING([--enable-assertions],[add runtime sanity checks in the
program]),,
[AS_CASE([$build_type], [dev*|pre*], [enable_assertions=yes],
@@ -322,6 +340,15 @@ if test x$GXX = xyes; then
;;
esac
fi
+ if test x$enable_lto != xno ; then
+ case $gxx_version in
+ 4.7*|4.8*)
+ lyx_flags="$lyx_flags link-time-optimization"
+ CFLAGS="$lto_opt $CFLAGS"
+ CXXFLAGS="$lto_opt $CXXFLAGS"
+ ;;
+ esac
+ fi
fi
test "$lyx_pch_comp" = yes && lyx_flags="$lyx_flags pch"
AM_CONDITIONAL(LYX_BUILD_PCH, test "$lyx_pch_comp" = yes)
--
1.8.0
