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Parallelize Link Time Optimization for GCC, CLANG and MINGW

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This patch tries to run multiple LTO threads in parallel, speeding up
the build process of optimized builds if the -j make parameter is used.
This mitigates the longer linking times of optimized builds since the
integration of the NNUE code. Roughly 2x build speedup.

I've tried a similar patch some two years ago but it ran into trouble
with old compiler versions then. Since we're on the C++17 standard now
these old compilers should be obsolete.

closes https://github.com/official-stockfish/Stockfish/pull/2943

No functional change.
This commit is contained in:
Guy Vreuls 2020-08-08 12:45:10 +02:00 • committed by Joost VandeVondele
parent e663bc5330
commit 6d6267c378
1 changed files with 17 additions and 4 deletions
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21
src/Makefile
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@ -282,6 +282,9 @@ ifeq ($(COMP),gcc)
ifneq ($(KERNEL),Darwin) ifneq ($(KERNEL),Darwin)
LDFLAGS += -Wl,--no-as-needed LDFLAGS += -Wl,--no-as-needed
endif endif
gccversion = $(shell $(CXX) --version)
gccisclang = $(findstring clang,$(gccversion))
endif endif
ifeq ($(COMP),mingw) ifeq ($(COMP),mingw)
@ -496,18 +499,28 @@ endif
### needs access to the optimization flags. ### needs access to the optimization flags.
ifeq ($(optimize),yes) ifeq ($(optimize),yes)
ifeq ($(debug), no) ifeq ($(debug), no)
ifeq ($(comp),$(filter $(comp),gcc clang)) ifeq ($(comp),clang)
CXXFLAGS += -flto=thin
LDFLAGS += $(CXXFLAGS)
# GCC and CLANG use different methods for parallelizing LTO and CLANG pretends to be
# GCC on some systems.
else ifeq ($(comp),gcc)
ifeq ($(gccisclang),)
CXXFLAGS += -flto CXXFLAGS += -flto
LDFLAGS += $(CXXFLAGS) -flto=jobserver
else
CXXFLAGS += -flto=thin
LDFLAGS += $(CXXFLAGS) LDFLAGS += $(CXXFLAGS)
endif endif
# To use LTO and static linking on windows, the tool chain requires a recent gcc: # To use LTO and static linking on windows, the tool chain requires a recent gcc:
# gcc version 10.1 in msys2 or TDM-GCC version 9.2 are know to work, older might not. # gcc version 10.1 in msys2 or TDM-GCC version 9.2 are know to work, older might not.
# So, only enable it for a cross from Linux by default. # So, only enable it for a cross from Linux by default.
ifeq ($(comp),mingw) else ifeq ($(comp),mingw)
ifeq ($(KERNEL),Linux) ifeq ($(KERNEL),Linux)
CXXFLAGS += -flto CXXFLAGS += -flto
LDFLAGS += $(CXXFLAGS) LDFLAGS += $(CXXFLAGS) -flto=jobserver
endif endif
endif endif
endif endif
@ -693,7 +706,7 @@ config-sanity:
@test "$(comp)" = "gcc" || test "$(comp)" = "icc" || test "$(comp)" = "mingw" || test "$(comp)" = "clang" @test "$(comp)" = "gcc" || test "$(comp)" = "icc" || test "$(comp)" = "mingw" || test "$(comp)" = "clang"
$(EXE): $(OBJS) $(EXE): $(OBJS)
$(CXX) -o $@ $(OBJS) $(LDFLAGS) +$(CXX) -o $@ $(OBJS) $(LDFLAGS)
clang-profile-make: clang-profile-make:
$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \ $(MAKE) ARCH=$(ARCH) COMP=$(COMP) \