From 5f6fd63f998e32bbe732fe7e9ac3d3de4841e37b Mon Sep 17 00:00:00 2001
From: Brett Cannon <brett@python.org>
Date: Fri, 18 Sep 2015 15:13:44 -0700
Subject: Issue #24915: Add Clang support to PGO builds and use the test suite
 for profile data.

Thanks to Alecsandru Patrascu of Intel for the initial patch.
---
 Makefile.pre.in | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

(limited to 'Makefile.pre.in')

diff --git a/Makefile.pre.in b/Makefile.pre.in
index ce2c0aa290..9a8c1599b9 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -43,6 +43,11 @@ LDVERSION=	@LDVERSION@
 HGVERSION=	@HGVERSION@
 HGTAG=		@HGTAG@
 HGBRANCH=	@HGBRANCH@
+PGO_PROF_GEN_FLAG=@PGO_PROF_GEN_FLAG@
+PGO_PROF_USE_FLAG=@PGO_PROF_USE_FLAG@
+LLVM_PROF_MERGER=@LLVM_PROF_MERGER@
+LLVM_PROF_FILE=@LLVM_PROF_FILE@
+LLVM_PROF_ERR=@LLVM_PROF_ERR@
 
 GNULD=		@GNULD@
 
@@ -226,8 +231,7 @@ TCLTK_INCLUDES=	@TCLTK_INCLUDES@
 TCLTK_LIBS=	@TCLTK_LIBS@
 
 # The task to run while instrument when building the profile-opt target
-PROFILE_TASK=	$(srcdir)/Tools/pybench/pybench.py -n 2 --with-gc --with-syscheck
-#PROFILE_TASK=	$(srcdir)/Lib/test/regrtest.py
+PROFILE_TASK=-m test.regrtest >/dev/null 2>&1
 
 # report files for gcov / lcov coverage report
 COVERAGE_INFO=	$(abs_builddir)/coverage.info
@@ -477,27 +481,38 @@ LIBRARY_OBJS=	\
 all:		build_all
 build_all:	$(BUILDPYTHON) oldsharedmods sharedmods gdbhooks Programs/_testembed python-config
 
-# Compile a binary with gcc profile guided optimization.
+# Compile a binary with profile guided optimization.
 profile-opt:
+	@if [ $(LLVM_PROF_ERR) == yes ]; then \
+		echo "Error: Cannot perform PGO build because llvm-profdata was not found in PATH" ;\
+		echo "Please add it to PATH and run ./configure again" ;\
+		exit 1;\
+	fi
 	@echo "Building with support for profile generation:"
 	$(MAKE) clean
+	$(MAKE) profile-removal
 	$(MAKE) build_all_generate_profile
-	@echo "Running benchmark to generate profile data:"
 	$(MAKE) profile-removal
+	@echo "Running code to generate profile data (this can take a while):"
 	$(MAKE) run_profile_task
+	$(MAKE) build_all_merge_profile
 	@echo "Rebuilding with profile guided optimizations:"
 	$(MAKE) clean
 	$(MAKE) build_all_use_profile
+	$(MAKE) profile-removal
 
 build_all_generate_profile:
-	$(MAKE) all CFLAGS_NODIST="$(CFLAGS) -fprofile-generate" LDFLAGS="-fprofile-generate" LIBS="$(LIBS) -lgcov"
+	$(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_GEN_FLAG)" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG)" LIBS="$(LIBS)"
 
 run_profile_task:
 	: # FIXME: can't run for a cross build
-	$(RUNSHARED) ./$(BUILDPYTHON) $(PROFILE_TASK)
+	$(LLVM_PROF_FILE) $(RUNSHARED) ./$(BUILDPYTHON) $(PROFILE_TASK) || true
+
+build_all_merge_profile:
+	$(LLVM_PROF_MERGER)
 
 build_all_use_profile:
-	$(MAKE) all CFLAGS_NODIST="$(CFLAGS) -fprofile-use -fprofile-correction"
+	$(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_USE_FLAG)"
 
 # Compile and run with gcov
 .PHONY=coverage coverage-lcov coverage-report
@@ -1568,9 +1583,11 @@ clean: pycremoval
 	-rm -f pybuilddir.txt
 	-rm -f Lib/lib2to3/*Grammar*.pickle
 	-rm -f Programs/_testembed Programs/_freeze_importlib
+	-rm -rf build
 
 profile-removal:
 	find . -name '*.gc??' -exec rm -f {} ';'
+	find . -name '*.profclang?' -exec rm -f {} ';'
 	rm -f $(COVERAGE_INFO)
 	rm -rf $(COVERAGE_REPORT)
 
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