automatically detect configuration changes

Makefile now automatically detects modifications of compilation flags,
and produce object files in directories dedicated to this compilation flags.
This makes it possible, for example, to compile libzstd with different DEBUGLEVEL.
Object files sharing the same configration will be generated into their dedicated directories.

Also : new compilation variables
- DEBUGLEVEL : select the debug level (assert & traces) inserted during compilation (default == 0 == release)
- HASH : select a hash function to differentiate configuration (default == md5sum)
- BUILD_DIR : skip the hash stage, store object files into manually specified directory
This commit is contained in:
Yann Collet 2020-10-21 19:22:45 -07:00
parent 8a453a34c5
commit d0436b2a45

View File

@ -54,17 +54,18 @@ else
CFLAGS += -O3
endif
CPPFLAGS+= -DXXH_NAMESPACE=ZSTD_
DEBUGLEVEL ?= 0
CPPFLAGS += -DXXH_NAMESPACE=ZSTD_ -DDEBUGLEVEL=$(DEBUGLEVEL)
ifeq ($(TARGET_SYSTEM),Windows_NT) # MinGW assumed
CPPFLAGS += -D__USE_MINGW_ANSI_STDIO # compatibility with %zu formatting
CPPFLAGS += -D__USE_MINGW_ANSI_STDIO # compatibility with %zu formatting
endif
DEBUGFLAGS= -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \
-Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement \
-Wstrict-prototypes -Wundef -Wpointer-arith \
-Wvla -Wformat=2 -Winit-self -Wfloat-equal -Wwrite-strings \
-Wredundant-decls -Wmissing-prototypes -Wc++-compat
CFLAGS += $(DEBUGFLAGS) $(MOREFLAGS)
FLAGS = $(CPPFLAGS) $(CFLAGS)
CFLAGS += $(DEBUGFLAGS) $(MOREFLAGS)
FLAGS = $(CPPFLAGS) $(CFLAGS)
HAVE_COLORNEVER = $(shell echo a | grep --color=never a > /dev/null 2> /dev/null && echo 1 || echo 0)
GREP_OPTIONS ?=
@ -170,7 +171,29 @@ ZSTD_LOCAL_OBJ := $(ZSTD_LOCAL_SRC:.c=.o)
ZSTD_SUBDIR := common compress decompress dictBuilder legacy deprecated
vpath %.c $(ZSTD_SUBDIR)
BUILD_DIR ?= obj
UNAME := $(shell uname)
ifeq ($(UNAME), Darwin)
HASH ?= md5
endif
ifeq ($(UNAME), FreeBSD)
HASH ?= gmd5sum
endif
ifeq ($(UNAME), OpenBSD)
HASH ?= md5
endif
HASH ?= md5sum
HAVE_HASH := $(shell echo 1 | $(HASH) > /dev/null && echo 1 || echo 0)
ifeq ($(HAVE_HASH), 1)
HASH_VALUE := $(shell echo $(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) | $(HASH) | head -c 16)
HASH_DIR := conf_$(HASH_VALUE)
else
$(info warning : could not find hash function to differentiate builds with different flags)
HASH_DIR := 0
endif
BUILD_DIR ?= obj/$(HASH_DIR)
ZSTD_DYNLIB_DIR := $(BUILD_DIR)/dynlib
ZSTD_DYNLIB_OBJ := $(addprefix $(ZSTD_DYNLIB_DIR)/, $(ZSTD_LOCAL_OBJ))
ZSTD_STATLIB_DIR := $(BUILD_DIR)/statlib
@ -200,24 +223,28 @@ lib-all: all
all: lib
libzstd.a: ARFLAGS = rcs
libzstd.a: $(ZSTD_STATLIB_OBJ)
$(ZSTD_STATLIB_DIR)/libzstd.a: ARFLAGS = rcs
$(ZSTD_STATLIB_DIR)/libzstd.a: $(ZSTD_STATLIB_OBJ)
@echo compiling static library
$(Q)$(AR) $(ARFLAGS) $@ $^
.PHONY: libzstd.a # must be run every time
libzstd.a: $(ZSTD_STATLIB_DIR)/libzstd.a
$(Q)ln -sf $< $@
ifneq (,$(filter Windows%,$(TARGET_SYSTEM)))
LIBZSTD = dll\libzstd.dll
$(LIBZSTD): $(ZSTD_FILES)
$(ZSTD_DYNLIB_DIR)/$(LIBZSTD): $(ZSTD_FILES)
@echo compiling dynamic library $(LIBVER)
$(CC) $(FLAGS) -DZSTD_DLL_EXPORT=1 -Wl,--out-implib,dll\libzstd.dll.a -shared $^ -o $@
else
LIBZSTD = libzstd.$(SHARED_EXT_VER)
$(LIBZSTD): CFLAGS += -fPIC
$(LIBZSTD): LDFLAGS += -shared -fvisibility=hidden
$(LIBZSTD): $(ZSTD_DYNLIB_OBJ)
$(ZSTD_DYNLIB_DIR)/$(LIBZSTD): CFLAGS += -fPIC
$(ZSTD_DYNLIB_DIR)/$(LIBZSTD): LDFLAGS += -shared -fvisibility=hidden
$(ZSTD_DYNLIB_DIR)/$(LIBZSTD): $(ZSTD_DYNLIB_OBJ)
@echo compiling dynamic library $(LIBVER)
$(Q)$(CC) $(FLAGS) $^ $(LDFLAGS) $(SONAME_FLAGS) -o $@
@echo creating versioned links
@ -226,6 +253,10 @@ $(LIBZSTD): $(ZSTD_DYNLIB_OBJ)
endif
.PHONY: $(LIBZSTD) # must be run every time
$(LIBZSTD): $(ZSTD_DYNLIB_DIR)/$(LIBZSTD)
$(Q)ln -sf $< $@
.PHONY: libzstd
libzstd : $(LIBZSTD)
@ -281,8 +312,7 @@ clean:
$(Q)$(RM) -r *.dSYM # macOS-specific
$(Q)$(RM) core *.o *.a *.gcda *.$(SHARED_EXT) *.$(SHARED_EXT).* libzstd.pc
$(Q)$(RM) dll/libzstd.dll dll/libzstd.lib libzstd-nomt*
$(Q)$(RM) common/*.o compress/*.o decompress/*.o dictBuilder/*.o legacy/*.o deprecated/*.o
$(Q)$(RM) -r $(ZSTD_STATLIB_DIR)/* $(ZSTD_DYNLIB_DIR)/*
$(Q)$(RM) -r obj/*
@echo Cleaning library completed
#-----------------------------------------------------------------------------