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![Junio C Hamano](/assets/img/avatar_default.png)
In "make DEVELOPER=YesPlease" builds, we try to help developers to catch as many potential issues as they can by using -Wall and turning compilation warnings into errors. In the same spirit, we recently started adding -std=gnu99 to their CFLAGS, so that they can notice when they accidentally used language features beyond C99. It however turns out that FreeBSD 13.0 mistakenly uses C11 extension in its system header files regardless of what __STDC_VERSION__ says, which means that the platform (unless we tweak their system headers) cannot be used for this purpose. It seems that -std=gnu99 is only added conditionally even in today's config.mak.dev, so it is fine if we dropped -std=gnu99 from there. Which means that developers on FreeBSD cannot participate in vetting use of features beyond C99, but there are developers on other platforms who will, so it's not too bad. We might want a more "fundamental" fix to make the platform capable of taking -std=gnu99, like working around the use of unconditional C11 extension in its system header files by supplying a set of "replacement" definitions in our header files. We chose not to pursue such an approach for two reasons at this point: (1) The fix belongs to the FreeBSD project, not this project, and such an upstream fix may happen hopefully in a not-too-distant future. (2) Fixing such a bug in system header files and working it around can lead to unexpected breakages (other parts of their system header files may not be expecting to see and do not work well with our "replacement" definitions). This close to the final release of this cycle, we have no time for that. Signed-off-by: Junio C Hamano <gitster@pobox.com>
69 lines
2.1 KiB
Plaintext
69 lines
2.1 KiB
Plaintext
ifndef COMPILER_FEATURES
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COMPILER_FEATURES := $(shell ./detect-compiler $(CC))
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endif
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ifeq ($(filter no-error,$(DEVOPTS)),)
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DEVELOPER_CFLAGS += -Werror
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SPARSE_FLAGS += -Wsparse-error
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endif
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DEVELOPER_CFLAGS += -Wall
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ifeq ($(filter no-pedantic,$(DEVOPTS)),)
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DEVELOPER_CFLAGS += -pedantic
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ifneq (($or $(filter gcc5,$(COMPILER_FEATURES)),$(filter clang4,$(COMPILER_FEATURES))),)
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DEVELOPER_CFLAGS += -Wpedantic
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ifneq ($(filter gcc10,$(COMPILER_FEATURES)),)
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ifeq ($(uname_S),MINGW)
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DEVELOPER_CFLAGS += -Wno-pedantic-ms-format
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endif
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endif
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endif
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endif
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ifneq ($(uname_S),FreeBSD)
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ifneq ($(or $(filter gcc6,$(COMPILER_FEATURES)),$(filter clang7,$(COMPILER_FEATURES))),)
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DEVELOPER_CFLAGS += -std=gnu99
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endif
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else
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# FreeBSD cannot limit to C99 because its system headers unconditionally
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# rely on C11 features.
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endif
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DEVELOPER_CFLAGS += -Wdeclaration-after-statement
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DEVELOPER_CFLAGS += -Wformat-security
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DEVELOPER_CFLAGS += -Wold-style-definition
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DEVELOPER_CFLAGS += -Woverflow
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DEVELOPER_CFLAGS += -Wpointer-arith
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DEVELOPER_CFLAGS += -Wstrict-prototypes
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DEVELOPER_CFLAGS += -Wunused
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DEVELOPER_CFLAGS += -Wvla
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DEVELOPER_CFLAGS += -fno-common
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ifneq ($(filter clang4,$(COMPILER_FEATURES)),)
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DEVELOPER_CFLAGS += -Wtautological-constant-out-of-range-compare
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endif
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ifneq ($(or $(filter gcc6,$(COMPILER_FEATURES)),$(filter clang4,$(COMPILER_FEATURES))),)
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DEVELOPER_CFLAGS += -Wextra
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# if a function is public, there should be a prototype and the right
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# header file should be included. If not, it should be static.
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DEVELOPER_CFLAGS += -Wmissing-prototypes
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ifeq ($(filter extra-all,$(DEVOPTS)),)
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# These are disabled because we have these all over the place.
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DEVELOPER_CFLAGS += -Wno-empty-body
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DEVELOPER_CFLAGS += -Wno-missing-field-initializers
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DEVELOPER_CFLAGS += -Wno-sign-compare
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DEVELOPER_CFLAGS += -Wno-unused-parameter
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endif
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endif
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# uninitialized warnings on gcc 4.9.2 in xdiff/xdiffi.c and config.c
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# not worth fixing since newer compilers correctly stop complaining
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ifneq ($(filter gcc4,$(COMPILER_FEATURES)),)
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ifeq ($(filter gcc5,$(COMPILER_FEATURES)),)
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DEVELOPER_CFLAGS += -Wno-uninitialized
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endif
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endif
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GIT_TEST_PERL_FATAL_WARNINGS = YesPlease
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