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Makefile: add missing settings to rebuild logic

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The Makefile didn't trigger a rebuild if some settings changed, e.g.
LDFLAGS or DECOMPRESSION_ONLY.  Fix this.

Also simplify the rebuild logic by not handling the library and programs
separately, as this optimization doesn't seem to be worthwhile.
This commit is contained in:
Eric Biggers 2020-10-25 21:06:50 -07:00
parent 7ba3155c17
commit 2bfee0204c
2 changed files with 26 additions and 24 deletions
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3
.gitignore vendored
View File

@ -10,8 +10,7 @@
*.obj
*.so
*.so.*
/.lib-cflags
/.prog-cflags
/.build-config
/programs/config.h
/benchmark
/checksum

47
Makefile
View File

@ -30,7 +30,7 @@
# doesn't link to any libc functions like malloc(), free(), and memcpy().
# All users will need to call libdeflate_set_memory_allocator().
#
# You can also specify custom CFLAGS, CPPFLAGS, and/or LDFLAGS.
# You can also specify a custom CC, CFLAGS, CPPFLAGS, and/or LDFLAGS.
#
##############################################################################
@ -135,6 +135,25 @@ endif
##############################################################################
# Rebuild if a user-specified setting that affects the build changed.
.build-config: FORCE
@flags=$$( \
echo 'DECOMPRESSION_ONLY=$(DECOMPRESSION_ONLY)'; \
echo 'DISABLE_GZIP=$(DISABLE_GZIP)'; \
echo 'DISABLE_ZLIB=$(DISABLE_ZLIB)'; \
echo 'FREESTANDING=$(FREESTANDING)'; \
echo 'CC=$(CC)'; \
echo 'CFLAGS=$(CFLAGS)'; \
echo 'CPPFLAGS=$(CPPFLAGS)'; \
echo 'LDFLAGS=$(LDFLAGS)'; \
); \
if [ "$$flags" != "`cat $@ 2>/dev/null`" ]; then \
[ -e $@ ] && echo "Rebuilding due to new settings"; \
echo "$$flags" > $@; \
fi
##############################################################################
COMMON_HEADERS := $(wildcard common/*.h) libdeflate.h
DEFAULT_TARGETS :=
@ -174,11 +193,11 @@ STATIC_LIB_OBJ := $(LIB_SRC:.c=.o)
SHARED_LIB_OBJ := $(LIB_SRC:.c=.shlib.o)
# Compile static library object files
$(STATIC_LIB_OBJ): %.o: %.c $(LIB_HEADERS) $(COMMON_HEADERS) .lib-cflags
$(STATIC_LIB_OBJ): %.o: %.c $(LIB_HEADERS) $(COMMON_HEADERS) .build-config
$(QUIET_CC) $(CC) -o $@ -c $(CPPFLAGS) $(LIB_CFLAGS) $<
# Compile shared library object files
$(SHARED_LIB_OBJ): %.shlib.o: %.c $(LIB_HEADERS) $(COMMON_HEADERS) .lib-cflags
$(SHARED_LIB_OBJ): %.shlib.o: %.c $(LIB_HEADERS) $(COMMON_HEADERS) .build-config
$(QUIET_CC) $(CC) -o $@ -c $(CPPFLAGS) $(LIB_CFLAGS) \
$(SHARED_LIB_CFLAGS) -DLIBDEFLATE_DLL $<
@ -202,14 +221,6 @@ $(SHARED_LIB_SYMLINK):$(SHARED_LIB)
DEFAULT_TARGETS += $(SHARED_LIB_SYMLINK)
endif
# Rebuild if CC, LIB_CFLAGS, or CPPFLAGS changed
.lib-cflags: FORCE
@flags='$(CC):$(LIB_CFLAGS):$(CPPFLAGS)'; \
if [ "$$flags" != "`cat $@ 2>/dev/null`" ]; then \
[ -e $@ ] && echo "Rebuilding library due to new compiler flags"; \
echo "$$flags" > $@; \
fi
##############################################################################
#### Programs
@ -243,12 +254,12 @@ ALL_PROG_OBJ := $(PROG_COMMON_OBJ) $(NONTEST_PROG_OBJ) \
$(TEST_PROG_COMMON_OBJ) $(TEST_PROG_OBJ)
# Generate autodetected configuration header
programs/config.h:scripts/detect.sh .prog-cflags
programs/config.h:scripts/detect.sh .build-config
$(QUIET_GEN) CC="$(CC)" CFLAGS="$(PROG_CFLAGS)" $< > $@
# Compile program object files
$(ALL_PROG_OBJ): %.o: %.c $(ALL_PROG_COMMON_HEADERS) $(COMMON_HEADERS) \
.prog-cflags
.build-config
$(QUIET_CC) $(CC) -o $@ -c $(CPPFLAGS) $(PROG_CFLAGS) $<
# Link the programs.
@ -276,14 +287,6 @@ endif
DEFAULT_TARGETS += gunzip$(PROG_SUFFIX)
# Rebuild if CC, PROG_CFLAGS, or CPPFLAGS changed
.prog-cflags: FORCE
@flags='$(CC):$(PROG_CFLAGS):$(CPPFLAGS)'; \
if [ "$$flags" != "`cat $@ 2>/dev/null`" ]; then \
[ -e $@ ] && echo "Rebuilding programs due to new compiler flags"; \
echo "$$flags" > $@; \
fi
##############################################################################
all:$(DEFAULT_TARGETS)
@ -347,7 +350,7 @@ clean:
programs/*.o programs/*.obj \
$(DEFAULT_TARGETS) $(TEST_PROGRAMS) programs/config.h \
libdeflate.lib libdeflate.def libdeflatestatic.lib \
.lib-cflags .prog-cflags
.build-config
realclean: clean
rm -f tags cscope*