From 2afbbde4cb6aab900cdf41a27da126ccbc361e52 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Thu, 12 Nov 2009 16:57:58 -0500
Subject: Implement profile-guided optimization builds.

---
 Makefile.am                    | 12 ++++++++++++
 configure.ac                   | 10 +++++++++-
 libdimension/Makefile.am       |  9 +++++++++
 tests/libdimension/Makefile.am | 14 +++++++++++---
 4 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index c1e3046..4746c81 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -26,6 +26,18 @@ SUBDIRS = libdimension                                                         \
 
 EXTRA_DIST = autogen.sh
 
+if PGO
+all-recursive:
+	cd $(top_builddir)/libdimension && $(MAKE) $(AM_MAKEFLAGS) libdimension-pgo.la
+	cd $(top_builddir)/tests/libdimension && $(MAKE) check
+	@for gcda in $(top_builddir)/tests/libdimension/pgo/.libs/*_pgo*.gcda; do \
+	  mv $$gcda $${gcda/_pgo/}; \
+	done
+	cd $(top_builddir)/libdimension && $(MAKE) $(AM_MAKEFLAGS) libdimension.la
+	cd $(top_builddir)/dimension && $(MAKE) $(AM_MAKEFLAGS) all
+	cd $(top_builddir)/doc && $(MAKE) $(AM_MAKEFLAGS) all
+endif
+
 bench: all-recursive
 	cd bench && $(MAKE) $(AM_MAKEFLAGS) bench
 
diff --git a/configure.ac b/configure.ac
index e81c598..2ce2001 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,10 +28,18 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AC_PROG_LIBTOOL
 
+dnl Profile-guided optimization (default disabled)
+AC_ARG_ENABLE([pgo],
+              [AS_HELP_STRING([--enable-pgo],
+                              [Enable profile-guided optimization])],
+              [],
+              [enable_pgo=no])
+AM_CONDITIONAL([PGO], [test "$enable_pgo" != "no"])
+
 dnl Timing library for benchmarks
 AC_CHECK_LIB([sandglass], [sandglass_create],
              [],
-             [AC_MSG_WARN([libsandglass not found - benchmarking suite will not work correctly])])
+             [AC_MSG_WARN([libsandglass not found - benchmarking suite will not work])])
 
 dnl Generate Makefiles
 AC_CONFIG_MACRO_DIR([m4])
diff --git a/libdimension/Makefile.am b/libdimension/Makefile.am
index fb15f44..274cbf3 100644
--- a/libdimension/Makefile.am
+++ b/libdimension/Makefile.am
@@ -65,3 +65,12 @@ libdimension_la_SOURCES = $(nobase_include_HEADERS)                            \
                           texture.c
 libdimension_la_LDFLAGS = -version-info 0:0:0
 libdimension_la_LIBADD  = -lm -lpthread -lpng -lGL
+
+if PGO
+EXTRA_LTLIBRARIES = libdimension-pgo.la
+libdimension_pgo_la_SOURCES = $(libdimension_la_SOURCES)
+libdimension_pgo_la_LIBADD  = $(libdimension_la_LIBADD) -lgcov
+libdimension_pgo_la_CFLAGS  = -fprofile-generate=./pgo
+
+libdimension_la_CFLAGS = -fprofile-correction -fprofile-use=$(top_builddir)/tests/libdimension/pgo
+endif
diff --git a/tests/libdimension/Makefile.am b/tests/libdimension/Makefile.am
index fe19ad4..50fa645 100644
--- a/tests/libdimension/Makefile.am
+++ b/tests/libdimension/Makefile.am
@@ -28,11 +28,19 @@ check_PROGRAMS    = error-test                                                 \
 TESTS             = $(check_PROGRAMS)
 XFAIL_TESTS       = error-test
 
-.PHONY: clean-local-png-test
-clean-local: clean-local-png-test
+.PHONY: clean-local-tests clean-local-png-test
+clean-local: clean-local-tests clean-local-png-test
 
 libdimension_tests_la_SOURCES = tests.c tests.h
-libdimension_tests_la_LIBADD  = $(top_builddir)/libdimension/libdimension.la
+
+if PGO
+libdimension_tests_la_LIBADD = $(top_builddir)/libdimension/libdimension-pgo.la
+clean-local-tests:
+	rm -rf ./pgo
+else
+libdimension_tests_la_LIBADD = $(top_builddir)/libdimension/libdimension.la
+clean-local-tests:
+endif
 
 error_test_SOURCES = error.c
 error_test_LDADD   = libdimension-tests.la
-- 
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