2015-10-06 20:40:07 +08:00
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# From linux.git/scripts/Kbuild.include
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#
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# try-run
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# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
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# Exit code chooses option. "$$TMP" is can be used as temporary file and
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# is automatically cleaned up.
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try-run = $(shell set -e; \
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TMP="$(TMPOUT).$$$$.tmp"; \
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TMPO="$(TMPOUT).$$$$.o"; \
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if ($(1)) >/dev/null 2>&1; \
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then echo "$(2)"; \
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else echo "$(3)"; \
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fi; \
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rm -f "$$TMP" "$$TMPO")
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# cc-option
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# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
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cc-option = $(call try-run,\
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$(CC) $(CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
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2018-12-05 14:40:06 +08:00
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# cc-disable-warning
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# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
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cc-disable-warning = $(call try-run, \
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$(CC) -Werror $(CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
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2015-10-06 20:40:07 +08:00
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# From linux.git/scripts/Makefile.extrawarn
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# ==========================================================================
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#
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# make W=... settings
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#
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# W=1 - warnings that may be relevant and does not occur too often
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# W=2 - warnings that occur quite often but may still be relevant
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# W=3 - the more obscure warnings, can most likely be ignored
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#
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# $(call cc-option, -W...) handles gcc -W.. options which
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# are not supported by all versions of the compiler
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# ==========================================================================
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ifeq ("$(origin W)", "command line")
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export BUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
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endif
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ifdef BUILD_ENABLE_EXTRA_GCC_CHECKS
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warning- := $(empty)
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warning-1 := -Wextra -Wunused -Wno-unused-parameter
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warning-1 += -Wmissing-declarations
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warning-1 += -Wmissing-format-attribute
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warning-1 += $(call cc-option, -Wmissing-prototypes)
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warning-1 += -Wold-style-definition
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warning-1 += $(call cc-option, -Wmissing-include-dirs)
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warning-1 += $(call cc-option, -Wunused-but-set-variable)
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warning-1 += $(call cc-disable-warning, missing-field-initializers)
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btrfs-progs: silence build warning caused by gcc 8 '-Wformat-truncation'
When using gcc8 + glibc 2.28.5 compiles utils.c, it complains as below:
utils.c:852:45: warning: '%s' directive output may be truncated writing
up to 4095 bytes into a region of size 4084 [-Wformat-truncation=]
snprintf(path, sizeof(path), "/dev/mapper/%s", name);
^~ ~~~~
In file included from /usr/include/stdio.h:873,
from utils.c:20:
/usr/include/bits/stdio2.h:67:10: note: '__builtin___snprintf_chk'
output between 13 and 4108 bytes into a destination of size 4096
return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__bos (__s), __fmt, __va_arg_pack ());
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This isn't a type of warning we care about, particularly when calling
snprintf() we expect string to be truncated.
Use the GCC option -Wno-format-truncation to disable this for default
build and W=1 build, while still keeping it for W=2 and W=3 builds.
Signed-off-by: Su Yanjun <suyj.fnst@cn.fujitsu.com>
[ Use cc-disable-warning to fix the not working CFLAGS setting in configure.ac ]
[ Keep the warning in W=2/W=3 build ]
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-05 14:40:07 +08:00
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warning-1 += $(call cc-disable-warning, format-truncation)
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2018-12-05 14:40:08 +08:00
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warning-1 += $(call cc-disable-warning, sign-compare)
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2019-06-14 02:45:49 +08:00
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warning-2 += $(call cc-option, -Waddress-of-packed-member)
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2015-10-06 20:40:07 +08:00
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warning-2 := -Waggregate-return
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warning-2 += -Wcast-align
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warning-2 += -Wdisabled-optimization
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warning-2 += -Wnested-externs
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warning-2 += $(call cc-option, -Wlogical-op)
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warning-2 += $(call cc-option, -Wmissing-field-initializers)
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btrfs-progs: silence build warning caused by gcc 8 '-Wformat-truncation'
When using gcc8 + glibc 2.28.5 compiles utils.c, it complains as below:
utils.c:852:45: warning: '%s' directive output may be truncated writing
up to 4095 bytes into a region of size 4084 [-Wformat-truncation=]
snprintf(path, sizeof(path), "/dev/mapper/%s", name);
^~ ~~~~
In file included from /usr/include/stdio.h:873,
from utils.c:20:
/usr/include/bits/stdio2.h:67:10: note: '__builtin___snprintf_chk'
output between 13 and 4108 bytes into a destination of size 4096
return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__bos (__s), __fmt, __va_arg_pack ());
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This isn't a type of warning we care about, particularly when calling
snprintf() we expect string to be truncated.
Use the GCC option -Wno-format-truncation to disable this for default
build and W=1 build, while still keeping it for W=2 and W=3 builds.
Signed-off-by: Su Yanjun <suyj.fnst@cn.fujitsu.com>
[ Use cc-disable-warning to fix the not working CFLAGS setting in configure.ac ]
[ Keep the warning in W=2/W=3 build ]
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-05 14:40:07 +08:00
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warning-2 += $(call cc-option, -Wformat-truncation)
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2015-10-06 20:40:07 +08:00
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warning-3 := -Wbad-function-cast
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warning-3 += -Wcast-qual
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warning-3 += -Wconversion
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warning-3 += -Wpacked
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warning-3 += -Wpadded
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warning-3 += -Wpointer-arith
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warning-3 += -Wredundant-decls
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warning-3 += -Wswitch-default
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warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
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warning-3 += $(call cc-option, -Wvla)
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2018-12-05 14:40:08 +08:00
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warning-3 += $(call cc-option, -Wsign-compare)
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2015-10-06 20:40:07 +08:00
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warning := $(warning-$(findstring 1, $(BUILD_ENABLE_EXTRA_GCC_CHECKS)))
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warning += $(warning-$(findstring 2, $(BUILD_ENABLE_EXTRA_GCC_CHECKS)))
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warning += $(warning-$(findstring 3, $(BUILD_ENABLE_EXTRA_GCC_CHECKS)))
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ifeq ("$(strip $(warning))","")
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$(error W=$(BUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
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endif
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EXTRAWARN_CFLAGS += $(warning)
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else
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ifeq ($(COMPILER),clang)
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EXTRAWARN_CFLAGS += $(call cc-disable-warning, initializer-overrides)
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EXTRAWARN_CFLAGS += $(call cc-disable-warning, unused-value)
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EXTRAWARN_CFLAGS += $(call cc-disable-warning, format)
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EXTRAWARN_CFLAGS += $(call cc-disable-warning, unknown-warning-option)
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EXTRAWARN_CFLAGS += $(call cc-disable-warning, sign-compare)
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EXTRAWARN_CFLAGS += $(call cc-disable-warning, format-zero-length)
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EXTRAWARN_CFLAGS += $(call cc-disable-warning, uninitialized)
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endif
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endif
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