mirror of
https://github.com/git/git.git
synced 2024-12-12 03:14:11 +08:00
6d5d4b4e93
Ever since the DEVELOPER=1 facility introduced there's been no way to
have custom CFLAGS (e.g. CFLAGS="-O0 -g -ggdb3") while still
benefiting from the set of warnings and assertions DEVELOPER=1
enables.
This is because the semantics of variables in the Makefile are such
that the user setting CFLAGS overrides anything we set, including what
we're doing in config.mak.dev[1].
So let's introduce a "DEVELOPER_CFLAGS" variable in config.mak.dev and
add it to ALL_CFLAGS. Before this the ALL_CFLAGS variable
would (basically, there's some nuance we won't go into) be set to:
$(CPPFLAGS) [$(CFLAGS) *or* $(CFLAGS) in config.mak.dev] $(BASIC_CFLAGS) $(EXTRA_CPPFLAGS)
But will now be:
$(DEVELOPER_CFLAGS) $(CPPFLAGS) $(CFLAGS) $(BASIC_CFLAGS) $(EXTRA_CPPFLAGS)
The reason for putting DEVELOPER_CFLAGS first is to allow for
selectively overriding something DEVELOPER=1 brings in. On both GCC
and Clang later settings override earlier ones. E.g. "-Wextra
-Wno-extra" will enable no "extra" warnings, but not if those two
arguments are reversed.
Examples of things that weren't possible before, but are now:
# Use -O0 instead of -O2 for less painful debuggng
DEVELOPER=1 CFLAGS="-O0 -g"
# DEVELOPER=1 plus -Wextra, but disable some of the warnings
DEVELOPER=1 DEVOPTS="no-error extra-all" CFLAGS="-O0 -g -Wno-unused-parameter"
The reason for the patches leading up to this one re-arranged the
various *FLAGS assignments and includes is just for readability. The
Makefile supports assignments out of order, e.g.:
$ cat Makefile
X = $(A) $(B) $(C)
A = A
B = B
include c.mak
all:
@echo $(X)
$ cat c.mak
C=C
$ make
A B C
So we could have gotten away with the much smaller change of changing
"CFLAGS" in config.mak.dev to "DEVELOPER_CFLAGS" and adding that to
ALL_CFLAGS earlier in the Makefile "before" the config.mak.*
includes. But I think it's more readable to use variables "after"
they're included.
1. https://www.gnu.org/software/make/manual/html_node/Overriding.html
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
49 lines
1.6 KiB
Plaintext
49 lines
1.6 KiB
Plaintext
ifeq ($(filter no-error,$(DEVOPTS)),)
|
|
DEVELOPER_CFLAGS += -Werror
|
|
endif
|
|
ifneq ($(filter pedantic,$(DEVOPTS)),)
|
|
DEVELOPER_CFLAGS += -pedantic
|
|
# don't warn for each N_ use
|
|
DEVELOPER_CFLAGS += -DUSE_PARENS_AROUND_GETTEXT_N=0
|
|
endif
|
|
DEVELOPER_CFLAGS += -Wall
|
|
DEVELOPER_CFLAGS += -Wdeclaration-after-statement
|
|
DEVELOPER_CFLAGS += -Wformat-security
|
|
DEVELOPER_CFLAGS += -Wno-format-zero-length
|
|
DEVELOPER_CFLAGS += -Wold-style-definition
|
|
DEVELOPER_CFLAGS += -Woverflow
|
|
DEVELOPER_CFLAGS += -Wpointer-arith
|
|
DEVELOPER_CFLAGS += -Wstrict-prototypes
|
|
DEVELOPER_CFLAGS += -Wunused
|
|
DEVELOPER_CFLAGS += -Wvla
|
|
|
|
ifndef COMPILER_FEATURES
|
|
COMPILER_FEATURES := $(shell ./detect-compiler $(CC))
|
|
endif
|
|
|
|
ifneq ($(filter clang4,$(COMPILER_FEATURES)),)
|
|
DEVELOPER_CFLAGS += -Wtautological-constant-out-of-range-compare
|
|
endif
|
|
|
|
ifneq ($(or $(filter gcc6,$(COMPILER_FEATURES)),$(filter clang4,$(COMPILER_FEATURES))),)
|
|
DEVELOPER_CFLAGS += -Wextra
|
|
# if a function is public, there should be a prototype and the right
|
|
# header file should be included. If not, it should be static.
|
|
DEVELOPER_CFLAGS += -Wmissing-prototypes
|
|
ifeq ($(filter extra-all,$(DEVOPTS)),)
|
|
# These are disabled because we have these all over the place.
|
|
DEVELOPER_CFLAGS += -Wno-empty-body
|
|
DEVELOPER_CFLAGS += -Wno-missing-field-initializers
|
|
DEVELOPER_CFLAGS += -Wno-sign-compare
|
|
DEVELOPER_CFLAGS += -Wno-unused-parameter
|
|
endif
|
|
endif
|
|
|
|
# uninitialized warnings on gcc 4.9.2 in xdiff/xdiffi.c and config.c
|
|
# not worth fixing since newer compilers correctly stop complaining
|
|
ifneq ($(filter gcc4,$(COMPILER_FEATURES)),)
|
|
ifeq ($(filter gcc5,$(COMPILER_FEATURES)),)
|
|
DEVELOPER_CFLAGS += -Wno-uninitialized
|
|
endif
|
|
endif
|