compilerplugins/Makefile-clang.mk

   1 #
   2 # This file is part of the LibreOffice project.
   3 #
   4 # This Source Code Form is subject to the terms of the Mozilla Public
   5 # License, v. 2.0. If a copy of the MPL was not distributed with this
   6 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7 #
   8
   9 # Make sure variables in this Makefile do not conflict with other variables (e.g. from gbuild).
  10
  11 CLANG_COMMA :=,
  12
  13 # You may occasionally want to override some of these
  14 CLANGCXX=$(filter-out -m32 -m64 -fsanitize=%,$(CXX))
  15
  16 # Compile flags ('make CLANGCXXFLAGS=-g' if you need to debug the plugin)
  17 CLANGCXXFLAGS=-O2 -Wall -Wextra -g
  18
  19 # The uninteresting rest.
  20
  21 # Clang headers require these.
  22 CLANGDEFS=-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -fno-rtti
  23 # All include locations needed.
  24 CLANGINCLUDES=-isystem $(CLANGDIR)/include -isystem $(CLANGDIR)/tools/clang/include
  25
  26 # Clang/LLVM libraries are intentionally not linked in, they are usually built as static libraries, which means the resulting
  27 # plugin would be big (even though the clang binary already includes it all) and it'd be necessary to explicitly specify
  28 # also all the dependency libraries.
  29
  30 CLANGINDIR=$(SRCDIR)/compilerplugins/clang
  31 # Cannot use $(WORKDIR), the plugin should survive even 'make clean', otherwise the rebuilt
  32 # plugin will cause cache misses with ccache.
  33 CLANGOUTDIR=$(BUILDDIR)/compilerplugins/obj
  34
  35 QUIET=$(if $(VERBOSE)$(verbose),,@)
  36
  37 ifneq ($(ENABLE_WERROR),)
  38 CLANGWERROR := -Werror
  39 endif
  40
  41 compilerplugins: compilerplugins-build
  42
  43 # The list of source files, generated automatically (all files in clang/, but not subdirs).
  44 CLANGSRC=$(foreach src,$(wildcard $(CLANGINDIR)/*.cxx), $(notdir $(src)))
  45 # Remember the sources and if they have changed, force plugin relinking.
  46 CLANGSRCCHANGED= \
  47     $(shell mkdir -p $(CLANGOUTDIR) ; \
  48             echo $(CLANGSRC) | sort > $(CLANGOUTDIR)/sources-new.txt; \
  49             if diff $(CLANGOUTDIR)/sources.txt $(CLANGOUTDIR)/sources-new.txt >/dev/null 2>/dev/null; then \
  50                 echo 0; \
  51             else \
  52                 mv $(CLANGOUTDIR)/sources-new.txt $(CLANGOUTDIR)/sources.txt; \
  53                 echo 1; \
  54             fi; \
  55     )
  56 ifeq ($(CLANGSRCCHANGED),1)
  57 .PHONY: CLANGFORCE
  58 CLANGFORCE:
  59 $(CLANGOUTDIR)/plugin.so: CLANGFORCE
  60 endif
  61 # Make the .so also explicitly depend on the sources list, to force update in case CLANGSRCCHANGED was e.g. during 'make clean'.
  62 $(CLANGOUTDIR)/plugin.so: $(CLANGOUTDIR)/sources.txt
  63 $(CLANGOUTDIR)/sources.txt:
  64         touch $@
  65
  66 compilerplugins-build: $(CLANGOUTDIR) $(CLANGOUTDIR)/plugin.so
  67
  68 compilerplugins-clean:
  69         rm -rf $(CLANGOUTDIR)
  70
  71 $(CLANGOUTDIR):
  72         mkdir -p $(CLANGOUTDIR)
  73
  74 CLANGOBJS=
  75
  76 define clangbuildsrc
  77 $(3): $(2) $(SRCDIR)/compilerplugins/Makefile-clang.mk $(CLANGOUTDIR)/clang-timestamp
  78         @echo [build CXX] $(subst $(SRCDIR)/,,$(2))
  79         $(QUIET)$(CLANGCXX) $(CLANGCXXFLAGS) $(CLANGWERROR) $(CLANGDEFS) $(CLANGINCLUDES) -I$(BUILDDIR)/config_host $(2) -fPIC $(CXXFLAGS_CXX11) -c -o $(3) -MMD -MT $(3) -MP -MF $(CLANGOUTDIR)/$(1).d
  80
  81 -include $(CLANGOUTDIR)/$(1).d
  82
  83 $(CLANGOUTDIR)/plugin.so: $(3)
  84 $(CLANGOUTDIR)/plugin.so: CLANGOBJS += $(3)
  85 endef
  86
  87 $(foreach src, $(CLANGSRC), $(eval $(call clangbuildsrc,$(src),$(CLANGINDIR)/$(src),$(CLANGOUTDIR)/$(src:.cxx=.o))))
  88
  89 $(CLANGOUTDIR)/plugin.so: $(CLANGOBJS)
  90         @echo [build LNK] $(subst $(BUILDDIR)/,,$@)
  91         $(QUIET)$(CLANGCXX) -shared $(CLANGOBJS) -o $@ \
  92                 $(if $(filter MACOSX,$(OS)),-Wl$(CLANG_COMMA)-flat_namespace \
  93                         -Wl$(CLANG_COMMA)-undefined -Wl$(CLANG_COMMA)suppress)
  94
  95 # Clang most probably doesn't maintain binary compatibility, so rebuild when clang changes.
  96 $(CLANGOUTDIR)/clang-timestamp: $(CLANGDIR)/bin/clang
  97         $(QUIET)touch $@
  98
  99 # vim: set noet sw=4 ts=4: