[Python-checkins] cpython (2.7): Issue #26359: Add the --with-optimizations flag.

[gregory.p.smith]

https://hg.python.org/cpython/rev/bc28cbd49070
changeset:   103295:bc28cbd49070
branch:      2.7
parent:      103293:c07aadf9f5cb
user:        Gregory P. Smith <greg at krypto.org>
date:        Wed Sep 07 23:28:23 2016 -0700
summary:
  Issue #26359: Add the --with-optimizations flag.

files:
  Makefile.pre.in |   8 ++--
  Misc/NEWS       |   2 +
  configure       |  55 +++++++++++++++++++++++++++++++++++++
  configure.ac    |  41 +++++++++++++++++++++++++++
  4 files changed, 102 insertions(+), 4 deletions(-)


diff --git a/Makefile.pre.in b/Makefile.pre.in
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -428,7 +428,7 @@
 # Rules
 
 # Default target
-all:		build_all
+all:		@DEF_MAKE_ALL_RULE@
 build_all:	$(BUILDPYTHON) oldsharedmods sharedmods gdbhooks
 
 # Compile a binary with profile guided optimization.
@@ -452,7 +452,7 @@
 	$(MAKE) profile-removal
 
 build_all_generate_profile:
-	$(MAKE) all CFLAGS="$(CFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LIBS="$(LIBS)"
+	$(MAKE) @DEF_MAKE_RULE@ CFLAGS="$(CFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LIBS="$(LIBS)"
 
 run_profile_task:
 	: # FIXME: can't run for a cross build
@@ -462,14 +462,14 @@
 	$(LLVM_PROF_MERGER)
 
 build_all_use_profile:
-	$(MAKE) all CFLAGS="$(CFLAGS) $(PGO_PROF_USE_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) @LTOFLAGS@"
+	$(MAKE) @DEF_MAKE_RULE@ CFLAGS="$(CFLAGS) $(PGO_PROF_USE_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) @LTOFLAGS@"
 
 # Compile and run with gcov
 .PHONY=coverage coverage-lcov coverage-report
 coverage:
 	@echo "Building with support for coverage checking:"
 	$(MAKE) clean profile-removal
-	$(MAKE) all CFLAGS="$(CFLAGS) -O0 -pg -fprofile-arcs -ftest-coverage" LIBS="$(LIBS) -lgcov"
+	$(MAKE) @DEF_MAKE_RULE@ CFLAGS="$(CFLAGS) -O0 -pg -fprofile-arcs -ftest-coverage" LIBS="$(LIBS) -lgcov"
 
 coverage-lcov:
 	@echo "Creating Coverage HTML report with LCOV:"
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -156,6 +156,8 @@
 Build
 -----
 
+- Issue #26359: Add the --with-optimizations configure flag.
+
 - Issue #10910: Avoid C++ compilation errors on FreeBSD and OS X.
   Also update FreedBSD version checks for the original ctype UTF-8 workaround.
 
diff --git a/configure b/configure
--- a/configure
+++ b/configure
@@ -668,6 +668,8 @@
 PGO_PROF_USE_FLAG
 PGO_PROF_GEN_FLAG
 LTOFLAGS
+DEF_MAKE_RULE
+DEF_MAKE_ALL_RULE
 UNIVERSAL_ARCH_FLAGS
 BASECFLAGS
 OPT
@@ -798,6 +800,7 @@
 enable_shared
 enable_profiling
 with_pydebug
+with_optimizations
 with_lto
 enable_toolbox_glue
 with_libs
@@ -1491,6 +1494,8 @@
                           compiler
   --with-suffix=.exe      set executable suffix
   --with-pydebug          build with Py_DEBUG defined
+  --with-optimizations    Enable all optimizations when available (LTO, PGO,
+                          etc). Disabled by default.
   --with-lto              Enable Link Time Optimization in PGO builds.
                           Disabled by default.
   --with-libs='lib1 ...'  link against additional libs
@@ -6386,6 +6391,47 @@
 fi
 
 
+# Enable optimization flags
+
+
+Py_OPT='false'
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-optimizations" >&5
+$as_echo_n "checking for --with-optimizations... " >&6; }
+
+# Check whether --with-optimizations was given.
+if test "${with_optimizations+set}" = set; then :
+  withval=$with_optimizations;
+if test "$withval" != no
+then
+  Py_OPT='true'
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+else
+  Py_OPT='false'
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; };
+fi
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+if test "$Py_OPT" = 'true' ; then
+  case $ac_sys_system in
+    Darwin*)
+      # At least on macOS El Capitan, LTO does not work with PGO.
+      Py_LTO='false'
+      ;;
+  esac
+  Py_LTO='true'
+  DEF_MAKE_ALL_RULE="profile-opt"
+  DEF_MAKE_RULE="build_all"
+else
+  DEF_MAKE_ALL_RULE="build_all"
+  DEF_MAKE_RULE="all"
+fi
+
+
 # Enable LTO flags
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-lto" >&5
@@ -16320,3 +16366,12 @@
 esac
 
 mv config.c Modules
+
+if test "$Py_OPT" = 'false' -a "$Py_DEBUG" != 'true'; then
+    echo "" >&6
+    echo "" >&6
+    echo "If you want a release build with all optimizations active (LTO, PGO, etc),"
+    echo "please run ./configure --with-optimizations" >&6
+    echo "" >&6
+    echo "" >&6
+fi
diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -1380,6 +1380,38 @@
 fi
 
 
+# Enable optimization flags
+AC_SUBST(DEF_MAKE_ALL_RULE)
+AC_SUBST(DEF_MAKE_RULE)
+Py_OPT='false'
+AC_MSG_CHECKING(for --with-optimizations)
+AC_ARG_WITH(optimizations, AS_HELP_STRING([--with-optimizations], [Enable all optimizations when available (LTO, PGO, etc). Disabled by default.]),
+[
+if test "$withval" != no
+then
+  Py_OPT='true'
+  AC_MSG_RESULT(yes);
+else
+  Py_OPT='false'
+  AC_MSG_RESULT(no);
+fi],
+[AC_MSG_RESULT(no)])
+if test "$Py_OPT" = 'true' ; then
+  case $ac_sys_system in
+    Darwin*)
+      # At least on macOS El Capitan, LTO does not work with PGO.
+      Py_LTO='false'
+      ;;
+  esac
+  Py_LTO='true'
+  DEF_MAKE_ALL_RULE="profile-opt"
+  DEF_MAKE_RULE="build_all"
+else
+  DEF_MAKE_ALL_RULE="build_all"
+  DEF_MAKE_RULE="all"
+fi
+
+
 # Enable LTO flags
 AC_SUBST(LTOFLAGS)
 AC_MSG_CHECKING(for --with-lto)
@@ -4775,3 +4807,12 @@
 esac
 
 mv config.c Modules
+
+if test "$Py_OPT" = 'false' -a "$Py_DEBUG" != 'true'; then
+    echo "" >&AS_MESSAGE_FD
+    echo "" >&AS_MESSAGE_FD
+    echo "If you want a release build with all optimizations active (LTO, PGO, etc),"
+    echo "please run ./configure --with-optimizations" >&AS_MESSAGE_FD
+    echo "" >&AS_MESSAGE_FD
+    echo "" >&AS_MESSAGE_FD
+fi

-- 
Repository URL: https://hg.python.org/cpython