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