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Precompile headers

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This cuts 'make install -j6' on my laptop from 170s to 134s.
This commit is contained in:
Eelco Dolstra 2019-11-06 16:54:18 +01:00
parent 39a2e166dd
commit 5ff4d77f55
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GPG key ID: 8170B4726D7198DE
6 changed files with 118 additions and 5 deletions
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42
mk/precompiled-headers.mk Normal file
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@ -0,0 +1,42 @@
PRECOMPILE_HEADERS ?= 1
print-var-help += \
echo " PRECOMPILE_HEADERS ($(PRECOMPILE_HEADERS)): Whether to use precompiled headers to speed up the build";
GCH = $(buildprefix)precompiled-headers.h.gch
$(GCH): precompiled-headers.h
@rm -f $@
@mkdir -p "$(dir $@)"
$(trace-gen) $(CXX) -x c++-header -o $@ $^ $(GLOBAL_CXXFLAGS)
PCH = $(buildprefix)precompiled-headers.h.pch
$(PCH): precompiled-headers.h
@rm -f $@
@mkdir -p "$(dir $@)"
$(trace-gen) $(CXX) -x c++-header -o $@ $^ $(GLOBAL_CXXFLAGS)
clean-files += $(GCH) $(PCH)
ifeq ($(PRECOMPILE_HEADERS), 1)
ifeq ($(CXX), g++)
GLOBAL_CXXFLAGS_PCH += -include $(buildprefix)precompiled-headers.h -Winvalid-pch
GLOBAL_ORDER_AFTER += $(GCH)
else ifeq ($(CXX), clang++)
GLOBAL_CXXFLAGS_PCH += -include-pch $(PCH) -Winvalid-pch
GLOBAL_ORDER_AFTER += $(PCH)
else
$(error Don't know how to precompile headers on $(CXX))
endif
endif