Come up with bootstrap-lto-lean config.

2019-04-09  Martin Liska  <mliska@suse.cz>

	* Makefile.in: Regenerate.
	* Makefile.tpl: Pass GENERATOR_CFLAGS
	in all stages.
2019-04-09  Martin Liska  <mliska@suse.cz>

	* bootstrap-lto-lean.mk: New file.
2019-04-09  Martin Liska  <mliska@suse.cz>

	* Makefile.in: Use GENERATOR_CFLAGS for all generators.
	* doc/install.texi: Document the new config.

From-SVN: r270223

ChangeLog

+2019-04-09  Martin Liska  <mliska@suse.cz>
+
+	* Makefile.in: Regenerate.
+	* Makefile.tpl: Pass GENERATOR_CFLAGS
+	in all stages.
+
 2019-03-28  Martin Liska  <mliska@suse.cz>
 
 	PR bootstrap/89829

Makefile.tpl

@@ -624,6 +624,7 @@ BASE_FLAGS_TO_PASS =[+ FOR flags_to_pass +][+ IF optional +] \
 	"[+flag+]=$([+flag+])"[+ ENDIF optional+][+ ENDFOR flags_to_pass +][+ FOR bootstrap-stage +] \
 	"STAGE[+id+]_CFLAGS=$(STAGE[+id+]_CFLAGS)" \
 	"STAGE[+id+]_CXXFLAGS=$(STAGE[+id+]_CXXFLAGS)" \
+	"STAGE[+id+]_GENERATOR_CFLAGS=$(STAGE[+id+]_GENERATOR_CFLAGS)" \
 	"STAGE[+id+]_TFLAGS=$(STAGE[+id+]_TFLAGS)"[+ ENDFOR bootstrap-stage +] \
 	$(CXX_FOR_TARGET_FLAG_TO_PASS) \
 	"TFLAGS=$(TFLAGS)" \
@@ -1193,6 +1194,7 @@ all-stage[+id+]-[+prefix+][+module+]: configure-stage[+id+]-[+prefix+][+module+]
 		CXXFLAGS="$(CXXFLAGS_FOR_TARGET)" \
 		LIBCFLAGS="$(LIBCFLAGS_FOR_TARGET)"[+ ELSE prefix +] \
 		CFLAGS="$(STAGE[+id+]_CFLAGS)" \
+		GENERATOR_CFLAGS="$(STAGE[+id+]_GENERATOR_CFLAGS)" \
 		CXXFLAGS="$(STAGE[+id+]_CXXFLAGS)"[+ IF prev +] \
 		LIBCFLAGS="$(STAGE[+id+]_CFLAGS)"[+ ELSE prev +] \
 		LIBCFLAGS="$(LIBCFLAGS)"[+ ENDIF prev +][+ ENDIF prefix +] \

config/ChangeLog

+2019-04-09  Martin Liska  <mliska@suse.cz>
+
+	* bootstrap-lto-lean.mk: New file.
+
 2019-03-02  Johannes Pfau  <johannespfau@gmail.com>
 
 	* mh-mingw: Also set __USE_MINGW_ACCESS flag for C++ code.

config/bootstrap-lto-lean.mk

+# This option enables LTO for stage4 and LTO for generators in stage3 with profiledbootstrap.
+# Otherwise, LTO is used in only stage3.
+
+STAGE3_CFLAGS += -flto=jobserver
+STAGEtrain_GENERATOR_CFLAGS += -flto=jobserver
+STAGEfeedback_CFLAGS += -flto=jobserver
+
+# assumes the host supports the linker plugin
+LTO_AR = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ar$(exeext) -B$$r/$(HOST_SUBDIR)/prev-gcc/
+LTO_RANLIB = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ranlib$(exeext) -B$$r/$(HOST_SUBDIR)/prev-gcc/
+
+LTO_EXPORTS = AR="$(LTO_AR)"; export AR; \
+	      RANLIB="$(LTO_RANLIB)"; export RANLIB;
+LTO_FLAGS_TO_PASS = AR="$(LTO_AR)" RANLIB="$(LTO_RANLIB)"
+
+do-compare = /bin/true

gcc/ChangeLog

+2019-04-09  Martin Liska  <mliska@suse.cz>
+
+	* Makefile.in: Use GENERATOR_CFLAGS for all generators.
+	* doc/install.texi: Document the new config.
+
 2019-04-09  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* tree-vect-data-refs.c (vect_get_smallest_scalar_type): Always

gcc/Makefile.in

@@ -785,8 +785,8 @@ CC_FOR_BUILD = @CC_FOR_BUILD@
 CXX_FOR_BUILD = @CXX_FOR_BUILD@
 NO_PIE_CFLAGS_FOR_BUILD = @NO_PIE_CFLAGS_FOR_BUILD@
 NO_PIE_FLAG_FOR_BUILD = @NO_PIE_FLAG_FOR_BUILD@
-BUILD_CFLAGS= @BUILD_CFLAGS@ -DGENERATOR_FILE
-BUILD_CXXFLAGS = @BUILD_CXXFLAGS@ -DGENERATOR_FILE
+BUILD_CFLAGS= @BUILD_CFLAGS@ $(GENERATOR_CFLAGS) -DGENERATOR_FILE
+BUILD_CXXFLAGS = @BUILD_CXXFLAGS@ $(GENERATOR_CFLAGS) -DGENERATOR_FILE
 BUILD_NO_PIE_CFLAGS = @BUILD_NO_PIE_CFLAGS@
 BUILD_CFLAGS += $(BUILD_NO_PIE_CFLAGS)
 BUILD_CXXFLAGS += $(BUILD_NO_PIE_CFLAGS)

gcc/doc/install.texi

@@ -2529,6 +2529,12 @@ static libraries are not compiled with link-time optimizations.  Since
 the GCC middle end and back end are in @file{libbackend.a} this means
 that only the front end is actually LTO optimized.
 
+@item @samp{bootstrap-lto-lean}
+This option is similar to @code{bootstrap-lto}, but is intended for
+faster build by only using LTO in the final bootstrap stage.
+With @samp{make profiledbootstrap} the LTO frontend
+is trained only on generator files.
+
 @item @samp{bootstrap-debug}
 Verifies that the compiler generates the same executable code, whether
 or not it is asked to emit debug information.  To this end, this