From d8c8bf19aa2cce3257f3fc28c384d5fbf798ad77 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Fri, 13 Nov 2009 15:06:29 -0500
Subject: PGO build improvements.

---
 Makefile.am                    | 26 +++++++++++++-------------
 configure.ac                   |  2 +-
 libdimension/Makefile.am       | 16 +++++++++++++---
 tests/libdimension/Makefile.am |  7 ++-----
 4 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 0328b10..9ba1193 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -27,20 +27,20 @@ SUBDIRS = libdimension                                                         \
 EXTRA_DIST = autogen.sh
 
 if PGO
-all-recursive:
-	@if ! ls $(top_builddir)/tests/libdimension/pgo/.libs/*.gcda >/dev/null; then \
-	  (cd $(top_builddir)/libdimension && $(MAKE) $(AM_MAKEFLAGS) libdimension-pgo.la) && \
-	  (cd $(top_builddir)/tests/libdimension && $(MAKE) check) && \
-	  for gcda in $$(ls $(top_builddir)/tests/libdimension/pgo/.libs/*_pgo*.gcda); do \
-	    mv $$gcda $${gcda/_pgo/}; \
-	  done \
+
+.PHONY: pgo bench
+pgo:
+	@if [ ! -d $(top_builddir)/libdimension/pgo/.libs ] || [ -z "$$(ls $(top_builddir)/libdimension/pgo/.libs/*.gcda 2>/dev/null)" ]; then \
+	  $(MAKE) $(AM_MAKEFLAGS) -C libdimension libdimension-pgo.la && \
+	  $(MAKE) -j1 -C tests/libdimension check; \
 	fi
-	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
+	@rename _pgo_la _la $$(find $(top_builddir)/libdimension/pgo/.libs/)
 
-bench: all
-	cd bench && $(MAKE) $(AM_MAKEFLAGS) bench
+all-recursive check-recursive install-recursive installcheck-recursive distdir: pgo
 
+else  ## PGO
 .PHONY: bench
+endif ## PGO
+
+bench: all-recursive
+	cd bench && $(MAKE) $(AM_MAKEFLAGS) bench
diff --git a/configure.ac b/configure.ac
index 2ce2001..d1f03f2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,7 @@ AC_PROG_LIBTOOL
 dnl Profile-guided optimization (default disabled)
 AC_ARG_ENABLE([pgo],
               [AS_HELP_STRING([--enable-pgo],
-                              [Enable profile-guided optimization])],
+                              [Enable profile-guided optimization [default=no]])],
               [],
               [enable_pgo=no])
 AM_CONDITIONAL([PGO], [test "$enable_pgo" != "no"])
diff --git a/libdimension/Makefile.am b/libdimension/Makefile.am
index 274cbf3..e67f09e 100644
--- a/libdimension/Makefile.am
+++ b/libdimension/Makefile.am
@@ -67,10 +67,20 @@ libdimension_la_LDFLAGS = -version-info 0:0:0
 libdimension_la_LIBADD  = -lm -lpthread -lpng -lGL
 
 if PGO
-EXTRA_LTLIBRARIES = libdimension-pgo.la
+
+noinst_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_pgo_la_CFLAGS  = -fprofile-generate=$$(readlink -f $(builddir))/pgo
+
+libdimension_la_CFLAGS = -fprofile-correction -fprofile-use=./pgo
+
+all-local: libdimension.la
+	@for Plo in .deps/libdimension_la*.Plo; do \
+	  [ -f "pgo/.libs/$$(basename $$Plo .Plo).gcda" ] && sed -ri 's|^(libdimension_la-.*).lo: ([^ ])|\1.lo:  pgo/.libs/\1.gcda \2|g' "$$Plo"; \
+	  true; \
+	done
 
-libdimension_la_CFLAGS = -fprofile-correction -fprofile-use=$(top_builddir)/tests/libdimension/pgo
+clean-local:
+	rm -rf pgo
 endif
diff --git a/tests/libdimension/Makefile.am b/tests/libdimension/Makefile.am
index 50fa645..7b238da 100644
--- a/tests/libdimension/Makefile.am
+++ b/tests/libdimension/Makefile.am
@@ -28,18 +28,15 @@ check_PROGRAMS    = error-test                                                 \
 TESTS             = $(check_PROGRAMS)
 XFAIL_TESTS       = error-test
 
-.PHONY: clean-local-tests clean-local-png-test
-clean-local: clean-local-tests clean-local-png-test
+.PHONY: clean-local-png-test
+clean-local: clean-local-png-test
 
 libdimension_tests_la_SOURCES = tests.c tests.h
 
 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
-- 
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