+GOCFLAGS = $(CFLAGS)
+
+# Pass additional PGO and LTO compiler options to the PGO build.
+BUILD_CFLAGS = $(PGO_BUILD_CFLAGS) $(PGO_BUILD_LTO_CFLAGS)
+override CFLAGS += $(BUILD_CFLAGS)
+override CXXFLAGS += $(BUILD_CFLAGS)
+
+# Additional PGO and LTO compiler options to generate profiling data
+# for the PGO build.
+PGO_BUILD_GEN_FLAGS_TO_PASS = \
+ PGO_BUILD_CFLAGS="@PGO_BUILD_GEN_CFLAGS@" \
+ PGO_BUILD_LTO_CFLAGS="@PGO_BUILD_LTO_CFLAGS@"
+
+# NB: Filter out any compiler options which may fail PGO training runs.
+PGO_BUILD_TRAINING_CFLAGS:= \
+ $(filter-out -Werror=%,$(CFLAGS))
+PGO_BUILD_TRAINING_CXXFLAGS:=\
+ $(filter-out -Werror=%,$(CXXFLAGS))
+PGO_BUILD_TRAINING_CFLAGS:= \
+ $(filter-out -Wall,$(PGO_BUILD_TRAINING_CFLAGS))
+PGO_BUILD_TRAINING_CXXFLAGS:= \
+ $(filter-out -Wall,$(PGO_BUILD_TRAINING_CXXFLAGS))
+PGO_BUILD_TRAINING_CFLAGS:= \
+ $(filter-out -specs=%,$(PGO_BUILD_TRAINING_CFLAGS))
+PGO_BUILD_TRAINING_CXXFLAGS:= \
+ $(filter-out -specs=%,$(PGO_BUILD_TRAINING_CXXFLAGS))
+PGO_BUILD_TRAINING_FLAGS_TO_PASS = \
+ PGO_BUILD_TRAINING=yes \
+ CFLAGS_FOR_TARGET="$(PGO_BUILD_TRAINING_CFLAGS)" \
+ CXXFLAGS_FOR_TARGET="$(PGO_BUILD_TRAINING_CXXFLAGS)"
+
+# Ignore "make check" errors in PGO training runs.
+PGO_BUILD_TRAINING_MFLAGS = -i
+
+# Additional PGO and LTO compiler options to use profiling data for the
+# PGO build.
+PGO_BUILD_USE_FLAGS_TO_PASS = \
+ PGO_BUILD_CFLAGS="@PGO_BUILD_USE_CFLAGS@" \
+ PGO_BUILD_LTO_CFLAGS="@PGO_BUILD_LTO_CFLAGS@"
+
+# PGO training targets for the PGO build. FIXME: Add gold tests to
+# training.
+PGO-TRAINING-TARGETS = binutils gas gdb ld sim
+PGO_BUILD_TRAINING = $(addprefix maybe-check-,$(PGO-TRAINING-TARGETS))
+
+CREATE_GCOV = create_gcov
+
+TFLAGS =
+
+# Defaults for all stages; some are overridden below.
+
+STAGE_CFLAGS = $(BOOT_CFLAGS)
+STAGE_TFLAGS = $(TFLAGS)
+STAGE_CONFIGURE_FLAGS=@stage2_werror_flag@
+
+[+ FOR bootstrap-stage +]
+# Defaults for stage [+id+]; some are overridden below.
+STAGE[+id+]_CFLAGS = $(STAGE_CFLAGS)
+STAGE[+id+]_CXXFLAGS = $(CXXFLAGS)
+@if target-libstdc++-v3-bootstrap
+# Override the above if we're bootstrapping C++.
+STAGE[+id+]_CXXFLAGS = $(STAGE[+id+]_CFLAGS)
+@endif target-libstdc++-v3-bootstrap
+STAGE[+id+]_TFLAGS = $(STAGE_TFLAGS)
+STAGE[+id+]_CONFIGURE_FLAGS = $(STAGE_CONFIGURE_FLAGS)
+[+ ENDFOR bootstrap-stage +]
+
+# By default, C and C++ are the only stage1 languages, because they are the
+# only ones we require to build with the bootstrap compiler, and also the
+# only ones useful for building stage2.
+
+STAGE1_CFLAGS = @stage1_cflags@
+STAGE1_CHECKING = @stage1_checking@
+STAGE1_LANGUAGES = @stage1_languages@
+# * We force-disable intermodule optimizations, even if
+# --enable-intermodule was passed, since the installed compiler
+# probably can't handle them. Luckily, autoconf always respects
+# the last argument when conflicting --enable arguments are passed.
+# * Likewise, we force-disable coverage flags, since the installed
+# compiler probably has never heard of them.
+# * We also disable -Wformat, since older GCCs don't understand newer %s.
+STAGE1_CONFIGURE_FLAGS = --disable-intermodule $(STAGE1_CHECKING) \
+ --disable-coverage --enable-languages="$(STAGE1_LANGUAGES)" \
+ --disable-build-format-warnings
+
+STAGEprofile_CFLAGS = $(STAGE2_CFLAGS) -fprofile-generate
+STAGEprofile_TFLAGS = $(STAGE2_TFLAGS)
+
+STAGEfeedback_CFLAGS = $(STAGE3_CFLAGS) -fprofile-use
+STAGEfeedback_TFLAGS = $(STAGE3_TFLAGS)
+
+STAGEautoprofile_CFLAGS = $(STAGE2_CFLAGS) -g
+STAGEautoprofile_TFLAGS = $(STAGE2_TFLAGS)
+
+STAGEautofeedback_CFLAGS = $(STAGE3_CFLAGS)
+STAGEautofeedback_TFLAGS = $(STAGE3_TFLAGS)
+
+do-compare = @do_compare@
+do-compare3 = $(do-compare)