diff -r 55886a6aed4b Makefile.pre.in
--- a/Makefile.pre.in	Thu Jun 02 23:51:22 2016 -0700
+++ b/Makefile.pre.in	Fri Jun 03 10:49:34 2016 +0300
@@ -429,7 +429,7 @@
 # Rules
 
 # Default target
-all:		build_all
+all:		@DEF_MAKE_ALL_RULE@
 build_all:	$(BUILDPYTHON) oldsharedmods sharedmods gdbhooks
 
 # Compile a binary with profile guided optimization.
@@ -453,7 +453,7 @@
 	$(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
@@ -463,14 +463,14 @@
 	$(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 -r 55886a6aed4b configure
--- a/configure	Thu Jun 02 23:51:22 2016 -0700
+++ b/configure	Fri Jun 03 10:49:34 2016 +0300
@@ -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
@@ -764,6 +766,7 @@
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -797,6 +800,7 @@
 enable_shared
 enable_profiling
 with_pydebug
+with_optimizations
 with_lto
 enable_toolbox_glue
 with_libs
@@ -874,6 +878,7 @@
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1126,6 +1131,15 @@
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1263,7 +1277,7 @@
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1416,6 +1430,7 @@
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1479,6 +1494,8 @@
                           compiler
   --with-suffix=.exe      set executable suffix
   --with-pydebug          build with Py_DEBUG defined
+  --with-optimizations    Enable all optimizations (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
@@ -2787,6 +2804,7 @@
 ac_config_headers="$ac_config_headers pyconfig.h"
 
 
+
 ac_aux_dir=
 for ac_dir in "$srcdir" "$srcdir/.." "$srcdir/../.."; do
   if test -f "$ac_dir/install-sh"; then
@@ -6370,6 +6388,41 @@
 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
+  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
@@ -16344,3 +16397,12 @@
 esac
 
 mv config.c Modules
+
+if test "$Py_OPT" = 'false'; 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 -r 55886a6aed4b configure.ac
--- a/configure.ac	Thu Jun 02 23:51:22 2016 -0700
+++ b/configure.ac	Fri Jun 03 10:49:34 2016 +0300
@@ -1377,6 +1377,32 @@
 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 (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
+  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)
@@ -4773,3 +4799,12 @@
 esac
 
 mv config.c Modules
+
+if test "$Py_OPT" = 'false'; 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