This patch enables compilation with -flto.
The performance benefits of LTO (GCC 4.9 & 6.1) are about 1% for glxgears.
Performance changes in OpenGL games haven't been measured yet, my feeling
is that they are negligible.
diff --git a/configure.ac b/configure.ac
index fc0b1db..e84a1ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -362,6 +362,8 @@ if test "x$GXX" = xyes; then
CXXFLAGS="$CXXFLAGS -fno-builtin-memcmp"
fi
+AX_CHECK_COMPILE_FLAG([-flto], AM_CONDITIONAL(COMPILER_UNDERSTANDS_LTO, true), AM_CONDITIONAL(COMPILER_UNDERSTANDS_LTO, false))
+
AC_SUBST([MSVC2013_COMPAT_CFLAGS])
AC_SUBST([MSVC2013_COMPAT_CXXFLAGS])
diff --git a/src/mapi/Makefile.am b/src/mapi/Makefile.am
index 68a28a2..4b7d266 100644
--- a/src/mapi/Makefile.am
+++ b/src/mapi/Makefile.am
@@ -51,6 +51,11 @@ AM_CPPFLAGS = \
include Makefile.sources
+if COMPILER_UNDERSTANDS_LTO
+CFLAGS += -fno-lto
+CXXFLAGS += -fno-lto
+endif
+
MKDIR_GEN = $(AM_V_at)$(MKDIR_P) $(@D)
PYTHON_GEN = $(AM_V_GEN)$(PYTHON2) $(PYTHON_FLAGS)
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