企业网站的种类,tk域名官方网站,电影网站开发,html编辑器有哪些PG16 PG中使用的makefile看起来代码比较多#xff0c;但是实际逻辑比较简单#xff0c;这里做一些抽象总结。
总结
Makefile.global.in的$(recurse)宏自动生成了target#xff0c;可以方便的进入内存目录进行编译。
all: all-common-recurse
all-common-recurse: submak… PG16 PG中使用的makefile看起来代码比较多但是实际逻辑比较简单这里做一些抽象总结。
总结
Makefile.global.in的$(recurse)宏自动生成了target可以方便的进入内存目录进行编译。
all: all-common-recurse
all-common-recurse: submake-generated-headersMAKE -C common allall: all-backend-recurse
all-backend-recurse: submake-generated-headersMAKE -C backend allinstall: install-common-recurse
install-common-recurse: submake-generated-headersMAKE -C common installinstall: install-backend-recurse
install-backend-recurse: submake-generated-headersMAKE -C backend installcheck: check-common-recurse
check-common-recurse: submake-generated-headers temp-installMAKE -C common checkcheck: check-backend-recurse
check-backend-recurse: submake-generated-headers temp-installMAKE -C backend checkMakefile.global.in同时定义了对.o合.bc文件的生成规则
%.o : %.cif test ! -d $(DEPDIR); then mkdir -p $(DEPDIR); fi$(COMPILE.c) -o $ $ -MMD -MP -MF $(DEPDIR)/$(*F).Po%.o : %.cppif test ! -d $(DEPDIR); then mkdir -p $(DEPDIR); fi$(COMPILE.cc) -o $ $ -MMD -MP -MF $(DEPDIR)/$(*F).Po%.bc : %.c$(COMPILE.c.bc) -o $ $%.bc : %.cpp$(COMPILE.cxx.bc) -o $ $在最内层目录的Makefile定义了OBJS例如OBJSaset.o mcxt.o ...然后调用common.mk文件对OBJS中的每一个元素进行隐式编译common.mk 简化版内层Makefile
OBJS aset.o mcxt.o# 没有OBJS生成规则make隐式生成.o文件调用上面定义的%.o : %.c规则
objfiles.txt: $(OBJS)# echo or touch objfiles如果打开了llvm简化版内层Makefile
OBJS aset.o mcxt.o# 没有aset.bc mcxt.bc生成规则make隐式生成.bc文件调用上面定义的%.bc : %.c规则。
objfiles.txt: $(patsubst %.o,%.bc, $(OBJS)) ## objfiles.txt: aset.bc mcxt.bc
# 没有OBJS生成规则make隐式生成.o文件调用上面定义的%.o : %.c规则
$(patsubst %.o,%.bc, $(OBJS)): $(OBJS) ## aset.bc mcxt.bc: aset.o mcxt.o1 执行make后发生了什么
简单工程中的makefile中可以看到很多target依赖关系一般也比较直接例如下面例子中
OrcV2CBindingsAddObjectFile 依赖 OrcV2CBindingsAddObjectFile.o 依赖 OrcV2CBindingsAddObjectFile.c
all: __BUILD_DIR \$(BUILD_DIR)/OrcV2CBindingsAddObjectFile \$(BUILD_DIR)/OrcV2CBindingsBasicUsage.PHONY: __BUILD_DIR$(BUILD_DIR)/OrcV2CBindingsAddObjectFile: $(BUILD_DIR)/OrcV2CBindingsAddObjectFile.o${CXX} $ ${CXXFLAGS} ${LLVM_LD_FLAGS} -o $
$(BUILD_DIR)/OrcV2CBindingsAddObjectFile.o: OrcV2CBindingsAddObjectFile.c${CC} -c $ ${CFLAGS} ${LLVM_CC_FLAGS} -o $但打开PG根目录下的Makefile
subdir src
top_builddir ..
include Makefile.globalSUBDIRS \common \port \timezone \backend \backend/utils/mb/conversion_procs \backend/snowball \include \interfaces \backend/replication/libpqwalreceiver \backend/replication/pgoutput \fe_utils \bin \pl \makefiles \test/regress \test/isolation \test/perlifeq ($(with_llvm), yes)
SUBDIRS backend/jit/llvm
endif# There are too many interdependencies between the subdirectories, so
# dont attempt parallel make here.
.NOTPARALLEL:$(recurse)...
...看不到target信息代码的可读性比较差因为所有target都是生成的。优点是target动态生成代码量少比较灵活。所有的细节都封装在$(recurse)中具体在Makefile.global.in中定义。
2 Makefile.global.in
截取关键代码 standard_targets all install installdirs uninstall distprep clean distclean maintainer-clean coverage check checkprep installcheck init-po update-po
# these targets should recurse even into subdirectories not being built:
standard_always_targets distprep clean distclean maintainer-clean.PHONY: $(standard_targets) install-strip html man installcheck-parallel update-unicode# make all the default target
all:##########################################################################
#
# Programs and flags# CompilersCPP CPP
CPPFLAGS CPPFLAGS
PG_SYSROOT PG_SYSROOToverride CPPFLAGS : $(ICU_CFLAGS) $(CPPFLAGS)ifdef PGXS
override CPPFLAGS : -I$(includedir_server) -I$(includedir_internal) $(CPPFLAGS)
else # not PGXS
override CPPFLAGS : -I$(top_srcdir)/src/include $(CPPFLAGS)
ifdef VPATH
override CPPFLAGS : -I$(top_builddir)/src/include $(CPPFLAGS)
endif
endif # not PGXSCC CC
GCC GCC
SUN_STUDIO_CC SUN_STUDIO_CC
CXX CXX
CFLAGS CFLAGS
CFLAGS_SL CFLAGS_SL
# *_MODULE are for flags applied to extension libraries
CFLAGS_SL_MODULE CFLAGS_SL_MODULE
CXXFLAGS_SL_MODULE CXXFLAGS_SL_MODULE
CFLAGS_UNROLL_LOOPS CFLAGS_UNROLL_LOOPS
CFLAGS_VECTORIZE CFLAGS_VECTORIZE
CFLAGS_CRC CFLAGS_CRC
PERMIT_DECLARATION_AFTER_STATEMENT PERMIT_DECLARATION_AFTER_STATEMENT
CXXFLAGS CXXFLAGSLLVM_CPPFLAGS LLVM_CPPFLAGS
LLVM_CFLAGS LLVM_CFLAGS
LLVM_CXXFLAGS LLVM_CXXFLAGS# Kind-of compilersBISON BISON
BISONFLAGS BISONFLAGS $(YFLAGS)
FLEX FLEX
FLEXFLAGS FLEXFLAGS $(LFLAGS)
DTRACE DTRACE
DTRACEFLAGS DTRACEFLAGS
ZIC ZIC# LinkingAR AR
AROPT crs
LIBS LIBS
LDAP_LIBS_FE LDAP_LIBS_FE
LDAP_LIBS_BE LDAP_LIBS_BE
UUID_LIBS UUID_LIBS
LLVM_LIBSLLVM_LIBS# Tree-wide build supportall install check installcheck: submake-generated-headers.PHONY: submake-generated-headerssubmake-generated-headers:
ifndef NO_GENERATED_HEADERS
ifeq ($(MAKELEVEL),0)$(MAKE) -C $(top_builddir)/src/backend generated-headers
endif
endif##########################################################################
#
# Recursive make supportdefine _create_recursive_target
.PHONY: $(1)-$(2)-recurse
$(1): $(1)-$(2)-recurse
$(1)-$(2)-recurse: $(if $(filter all install check installcheck, $(3)), submake-generated-headers) $(if $(filter check, $(3)), temp-install)$$(MAKE) -C $(2) $(3)
endefrecurse $(foreach target,$(if $1,$1,$(standard_targets)),$(foreach subdir,$(if $2,$2,$(SUBDIRS)),$(eval $(call 在最后面我们看到了recurse的定义 recurse $(foreach target,$(if $1,$1,$(standard_targets)),$(foreach subdir,$(if $2,$2,$(SUBDIRS)),$(eval $(call _create_recursive_target,$(target),$(subdir),$(if $3,$3,$(target)))))) 这里调用了_create_recursive_target函数来生成所有目录的target。
PG的例子太复杂这里抽象出来一个最小用例来继续分析。
3 $(recurse)最小DEMO
Makefile subdir src
top_builddir ..
include Makefile.globalSUBDIRS \common \port \timezone \backend$(recurse)Makefile.global standard_targets all install check
.PHONY: $(standard_targets)all:###############################
all install check installcheck: submake-generated-headers.PHONY: submake-generated-headerssubmake-generated-headers:
ifndef NO_GENERATED_HEADERS
ifeq ($(MAKELEVEL),0)$(info ------------GENERATEHEADERS------------)
endif
endif###############################
define _create_recursive_target
.PHONY: $(1)-$(2)-recurse
$(1): $(1)-$(2)-recurse
$(1)-$(2)-recurse: $(if $(filter all install check installcheck, $(3)), submake-generated-headers) $(if $(filter check, $(3)), temp-install)$(info ------------GENERATE TATGETS------------)$(info $$1: $1, $$2: $2, $$3: $3)$(info $(1): $(1)-$(2)-recurse)$(info $(1)-$(2)-recurse: $(if $(filter all install check installcheck, $(3)), submake-generated-headers) $(if $(filter check, $(3)), temp-install))$(info MAKE -C $(2) $(3))$$(MAKE) -C $(2) $(3)
endefrecurse $(foreach target,$(if $1,$1,$(standard_targets)),$(foreach subdir,$(if $2,$2,$(SUBDIRS)),$(eval $(call _create_recursive_target,$(target),$(subdir),$(if $3,$3,$(target))))))# recurse \
# $(foreach target,$(if $1,$1,$(standard_targets)),\
# $(foreach subdir,$(if $2,$2,$(SUBDIRS)),\
# $(eval $(call _create_recursive_target,$(target),$(subdir),$(if $3,$3,$(target))))\
# )\
# )执行结果
4 $(recurse)最小DEMO结果分析
recurse $(foreach target,$(if $1,$1,$(standard_targets)),$(foreach subdir,$(if $2,$2,$(SUBDIRS)),$(eval $(call _create_recursive_target,$(target),$(subdir),$(if $3,$3,$(target))))))
展开后
recurse \$(foreach target,$(if $1,$1,$(standard_targets)),\$(foreach subdir,$(if $2,$2,$(SUBDIRS)),\$(eval $(call _create_recursive_target,$(target),$(subdir),$(if $3,$3,$(target))))\)\)外层循环遍历standard_targets all install check也就是PG定义的所有make指令需要为每个指令定义target。内层循环遍历SUBDIRS common backend这个是Makefile中定义的也就是谁include Makefile.global谁负责定义好SUBDIRS。表示当前目录下哪些子目录需要进行编译。
调用_create_recursive_target函数为makefile动态定义target
define _create_recursive_target
.PHONY: $(1)-$(2)-recurse
$(1): $(1)-$(2)-recurse
$(1)-$(2)-recurse: $(if $(filter all install check installcheck, $(3)), submake-generated-headers) $(if $(filter check, $(3)), temp-install)$$(MAKE) -C $(2) $(3)
endef函数执行后生成一系列target两个小细节
如果target是all install check installcheck集中情况需要增加submake-generated-headers依赖这个是生成头文件的PG的一些头文件是编译时生成出来的。如果target是check需要增加temp-install依赖temp-install是负责regress测试的target。
all: all-common-recurse
all-common-recurse: submake-generated-headersMAKE -C common allall: all-backend-recurse
all-backend-recurse: submake-generated-headersMAKE -C backend allinstall: install-common-recurse
install-common-recurse: submake-generated-headersMAKE -C common installinstall: install-backend-recurse
install-backend-recurse: submake-generated-headersMAKE -C backend installcheck: check-common-recurse
check-common-recurse: submake-generated-headers temp-installMAKE -C common checkcheck: check-backend-recurse
check-backend-recurse: submake-generated-headers temp-installMAKE -C backend check5 继续完善demo
前面提到的demo只构造了target并没有真正编译.c文件。继续增加了.c文件编译到.o的部分。
$ tree
.
├── common
│ ├── aset.c
│ └── Makefile
├── common.mk
├── Makefile
└── Makefile.global1 directory, 5 filescommon/Makefile
subdir src/backend/utils/mmgr
top_builddir ../../../..
include ../Makefile.globalOBJS \aset.oinclude ../common.mkcommon.mk
subsysfilename objfiles.txtifneq ($(subdir), src/backend)
all: $(subsysfilename)
endifobjfiles.txt: $(OBJS)$(if $(filter-out $(OBJS),$?),( $(if $(SUBDIROBJS),cat $(SUBDIROBJS); )echo $(addprefix $(subdir)/,$(OBJS)) ) $,touch $)
Makefile subdir src
top_builddir ..
include Makefile.globalSUBDIRS \common \backend$(recurse)Makefile.global standard_targets all install check
.PHONY: $(standard_targets)all:###############################
all install check installcheck: submake-generated-headers.PHONY: submake-generated-headerssubmake-generated-headers:
ifndef NO_GENERATED_HEADERS
ifeq ($(MAKELEVEL),0)$(info ------------GENERATEHEADERS------------)
endif
endif###############################
define _create_recursive_target
.PHONY: $(1)-$(2)-recurse
$(1): $(1)-$(2)-recurse
$(1)-$(2)-recurse: $(if $(filter all install check installcheck, $(3)), submake-generated-headers) $(if $(filter check, $(3)), temp-install)$(info ------------GENERATE TATGETS------------)$(info $$1: $1, $$2: $2, $$3: $3)$(info $(1): $(1)-$(2)-recurse)$(info $(1)-$(2)-recurse: $(if $(filter all install check installcheck, $(3)), submake-generated-headers) $(if $(filter check, $(3)), temp-install))$(info MAKE -C $(2) $(3))$$(MAKE) -C $(2) $(3)
endefrecurse $(foreach target,$(if $1,$1,$(standard_targets)),$(foreach subdir,$(if $2,$2,$(SUBDIRS)),$(eval $(call _create_recursive_target,$(target),$(subdir),$(if $3,$3,$(target))))))# recurse \
# $(foreach target,$(if $1,$1,$(standard_targets)),\
# $(foreach subdir,$(if $2,$2,$(SUBDIRS)),\
# $(eval $(call _create_recursive_target,$(target),$(subdir),$(if $3,$3,$(target))))\
# )\
# )这里主要需要关注的就是common.mk。每个源码目录中都有一些文件需要编译所以都需要配一个Makefile这些Makefile中相同的逻辑抽取到了common.mk中。
objfiles.txt: $(OBJS)......注意这里OBJS aset.o这里makefile构造objfiles.txt依赖aset.o而aset.o触发了Makefile的隐式规则会自动从aset.c编译为aset.o。
除了规则外具体的编译方法也可以在Makefile中定义例如PG的makefile.global.in中定义了对.o文件的处理方法。
%.o : %.cif test ! -d $(DEPDIR); then mkdir -p $(DEPDIR); fi$(COMPILE.c) -o $ $ -MMD -MP -MF $(DEPDIR)/$(*F).Po%.o : %.cppif test ! -d $(DEPDIR); then mkdir -p $(DEPDIR); fi$(COMPILE.cc) -o $ $ -MMD -MP -MF $(DEPDIR)/$(*F).Po
llvm支持common.mk中还有一段如果打开了llvm后objfiles.txt会同时依赖.o和.bc文件。
ifeq ($(with_llvm), yes)
objfiles.txt: $(patsubst %.o,%.bc, $(OBJS))
$(patsubst %.o,%.bc, $(OBJS)): $(OBJS)
endif在makefile.global.in中也定义了对.bc文件的处理方法
%.bc : %.c$(COMPILE.c.bc) -o $ $%.bc : %.cpp$(COMPILE.cxx.bc) -o $ $
