Add link time optimization support to makepkg

Add the 'lto' option to enable building with link time optimization
by adding '-flto' to both CFLAGS and CXXFLAGS.  The 'lto' option can
be specificed both in the PKGBUILD or by setting the default in
makepkg.conf.

Signed-off-by: Allan McRae <allan@archlinux.org>

2 files changed, 8 insertions, 0 deletions

diff --git a/doc/PKGBUILD.5.asciidoc b/doc/PKGBUILD.5.asciidoc
index 1db0b6c4..af615040 100644
--- a/doc/PKGBUILD.5.asciidoc
+++ b/doc/PKGBUILD.5.asciidoc
@@ -325,6 +325,10 @@ underscore and the architecture name e.g., 'replaces_x86_64=()'.
 		When used in combination with the `strip' option, a separate package
 		containing the debug symbols is created.
 
+	*lto*;;
+		Enable building packages using link time optimization. Adds '-flto'
+		to both CFLAGS and CXXFLAGS.
+
 
 Packaging Functions
 -------------------
diff --git a/doc/makepkg.conf.5.asciidoc b/doc/makepkg.conf.5.asciidoc
index 04cc5ea9..2c7a54db 100644
--- a/doc/makepkg.conf.5.asciidoc
+++ b/doc/makepkg.conf.5.asciidoc
@@ -189,6 +189,10 @@ Options
 		DEBUG_CXXFLAGS to their counterpart buildflags. Creates a separate
 		package containing the debug symbols when used with `strip'.
 
+	*lto*;;
+		Enable building packages using link time optimization. Adds '-flto'
+		to both CFLAGS and CXXFLAGS.
+
 **INTEGRITY_CHECK=(**check1 ...**)**::
 	File integrity checks to use. Multiple checks may be specified; this
 	affects both generation and checking. The current valid options are: