Meh*_*dad 177 c++ gcc warnings compiler-warnings gcc-warning
我想启用 - 字面上 - GCC 所有的警告.(你会觉得这很容易......)
你认为-Wall可能会有所作为,但不是!仍然需要-Wextra.
你认为-Wextra可能会有所作为,但不是!并非此处列出的所有警告(例如-Wshadow)都已启用.我仍然不知道这份清单是否全面.
我如何告诉海湾合作委员会启用(不是,不是,或者是!)所有警告？
Jon*_*ely 121
你不能.
GCC 4.4.0的手册仅适用于该版本,但它列出了4.4.0的所有可能警告.它们并不是您链接到的页面上的所有内容,例如,某些特定于语言的选项位于C++选项或Obj-C选项的页面上.要找到它们,您最好查看选项摘要
打开所有内容将包括-Wdouble-promotion哪些仅与具有32位单精度浮点单元的CPU相关,该单元float在硬件中实现,但double在软件中进行仿真.double使用软件仿真进行计算并且速度较慢.这与某些嵌入式CPU相关,但与具有64位浮点硬件支持的现代桌面CPU完全无关.
另一个通常不常用的-Wtraditional警告是,它警告传统C中具有不同含义(或不起作用)的完美良好的代码,例如"string " "concatenation",或ISO C函数定义!你真的关心与30岁编译器的兼容性吗？你真的想要写一个警告int inc(int i) { return i+1; }吗？
我认为-Weffc++太嘈杂而无用,它基于过时的第一版Effective C++,并警告有关C++完全有效的构造(并且本书的后续版本中的指南也有所改变.)我不想成为警告我没有std::string在我的构造函数中初始化一个成员; 它有一个默认的构造函数,它完全符合我的要求,为什么要写m_str()它来调用呢？-Weffc++有用的警告对于编译器来说太难以准确检测(给出错误的否定),而那些没用的警告,例如明确地初始化所有成员,只会产生太多噪音,从而产生误报.
Luc Danton提供了一个很好的无用警告示例-Waggregate-return,几乎可以肯定C++代码没有任何意义.
即你真的不想要所有警告,你只是认为你这样做.
阅读手册,阅读它们,确定您可能要启用哪些,尝试它们.无论如何,阅读编译器的手册是一件好事TM,采取捷径并启用你不理解的警告并不是一个好主意,特别是如果要避免使用RTFM.
任何只是打开一切的人都可能是这样做的,因为他们一无所知,或者一个尖头发的老板说"没有警告".
编辑:另请参阅-Wall-all以启用作为WONTFIX关闭的所有警告.
编辑2:响应DevSolar关于makefile需要根据编译器版本使用不同警告的抱怨,如果-Wall -Wextra不适合那么使用编译器特定和特定于版本的CFLAGS并不困难:
compiler_name := $(notdir $(CC))
ifeq ($(compiler_name),gcc)
compiler_version := $(basename $(shell $(CC) -dumpversion))
endif
ifeq ($(compile_name),clang)
compiler_version := $(shell $(CC) --version | awk 'NR==1{print $$3}')
endif
# ...
wflags.gcc.base := -Wall -Wextra
wflags.gcc.4.7 := -Wzero-as-null-pointer-constant
wflags.gcc.4.8 := $(wflags.gcc.4.7)
wflags.clang.base := -Wall -Wextra
wflags.clang.3.2 := -Weverything
CFLAGS += $(wflags.$(compiler_name).base) $(wflags.$(compiler_name).$(compiler_version))
Haa*_*hii 63
我同意之前的答案,即启用字面上的所有警告可能没有益处,但是GCC确实提供了一种相当方便的方法来实现这一点.命令
gcc -Q --help=warning
提供所有支持的警告选项的列表,以及有关它们是否处于活动状态的信息 顺便说一句,这可以用来找出(-Wall和)启用哪些选项(例如和)-Wextra
gcc -Wall -Wextra -Q --help=warning
要启用所有警告,您可以使用一些正则表达式来提取命令行参数
gcc -Q --help=warning | sed -e 's/^\s*\(\-\S*\)\s*\[\w*\]/\1 /gp;d' | tr -d '\n'
对于我目前的GCC,这给出了:
-Wabi -Wabi-tag -Waddress -Waggregate-return -Waggressive-loop-optimizations -Waliasing -Walign-commons -Wampersand -Warray-bounds -Warray-temporaries -Wassign-intercept -Wattributes -Wbad-function-cast -Wbool-compare -Wbuiltin-macro-redefined -Wc ++ - compat -Wc ++ 0x-compat -Wc ++ 14-compat -Wc-binding-type -Wc90-c99-compat -Wc99-c11-compat -Wcast-align -Wcast-qual -Wchar-subscripts -Wcharacter-truncation -Wchkp -Wclobbered -Wcomment -Wcompare-reals -Wconditionally-supported -Wconversion -Wconversion-extra -Wconversion-null -Wcoverage-mismatch -Wcpp -Wctor-dtor-privacy -Wdate-time -Wdeclaration -after-statement -Wdelete-incomplete -Wdelete-non-virtual-dtor -Wdeprecated -Wdeprecated-declarations -Wignedated-init -Wdisabled-optimization -Wdiscarded-array-qualifiers -Wdiscarded-qualifiers -Wdiv-by-zero -Wdouble-promotion -Weffc ++ -Wempty-body -Wendif-labels -Wenum-compare -Wextra -Wfloat-equal -Wformat-contains-nul -Wformat-extra-args -Wformat-nonliteral -Wformat-security -Wformat-signedness- Wformat-y2k -Wformat-zero-length -Wfree-nonheap-object -Wfunction-elimination -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wimplicit-interface -Wimplicit-procedure -Wincompatible-pointer-types - Winherited-variadic-ctor -Winit-self -Winline -Wint-conversion -Wint-to-pointer-cast -Wintrinsic-shadow -Wintrinsics-std -Winvalid-memory-model -Winvalid-offsetof -Winvalid-pch -Wjump-missses- init -Wline-truncation -Wliteral-suffix -Wlogical-not-parentheses -Wlogical-op -Wlong-long -Wmain -Wmaybe-uninitialized -Wmemset-transposed-args -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers- Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-prototypes -Wmultichar -Wnarrowing -Wnested-externs -Wnoexcept -Wnon-template-friend -Wnon-virtual-dtor -Wnonnull -Wodr -Wold-style-cast -Wold- style-declaration -Wold-style-definition -Wopenmp-simd -Woverflow -Woverlength-strings -Woverloaded-virtual -Woverride-init -Wpacked -Wpacked-bitfield-compat -Wpadde d -Whatarentheses -Wpedantic -Wpmf-conversions -Wpointer-arith -Wpointer-sign -Wpointer-to-int-cast -Wpragmas -Wproperty-assign-default -Wprotocol -Wreal-q-constant -Wrealloc-lhs -Wallalloc-lhs- all -Wredundant-decls -Wreorder -Wreturn-local-addr -Wreturn-type -Wselector -Wsequence-point -Wshadow -Wshadow-ivar -Wshift-count-negative -Wshift-count-overflow -Wsign-compare -Wsign-promo - Wsized-deallocation -Wsizeof-array-argument -Wsizeof-pointer-memaccess -Wstack-protector -Wstrict-null-sentinel -Wstrict-prototypes -Wstrict-selector-match -Wsuggest-attribute = const -Wsuggest-attribute = format -Wsuggest- attribute = noreturn -Wsuggest-attribute = pure -Wsuggest-final-methods -Wsuggest-final-types -Wsuggest-override -Wsurprising -Wswitch -Wswitch-bool -Wswitch-default -Wswitch-enum -Wsync-nand -Wsynth -Wsystem- headers -Wtabs -Wtarget-lifetime -Wditional -Wditional-conversion -Wtrampolines -Wtrigraphs -Wtype-limits -Wundeclared-selector -Wundef -Wunderflow -Wuninitialized -Wunknown-pragmas -Wuns afe-loop-optimizations -Wunnsixed-float-constants -Wunused -Wunused-but-set-parameter -Wunused-but-set-variable -Wunused-dummy-argument -Wunused-function -Wunused-label -Wunused-local-typedefs - Wunused-macros -Wunused-parameter -Wunused-result -Wunused-value -Wunused-variable -Wuse-without-only -Wuseless-cast -Wvarargs -Wvariadic-macros -Wvector-operation-performance -Wvirtual-move-assign -Wvla - Wvolatile-register-var -Wwrite-strings -Wzero-as-null-pointer-constant -Wzerotrip -frequire-return-statement
现在可以用它来调用GCC,即
gcc $(gcc -Q --help=warning | sed -e 's/^\s*\(\-\S*\)\s*\[\w*\]/\1 /gp;d' | tr -d '\n')
但请注意,由于某些警告选项仅适用于某些语言(例如C++),因此会导致警告.通过使用一些更多的正则表达式来仅包括当前语言允许的选项可以避免这些.
Kon*_*ski 15
在启用所有警告的情况下编程是完全不可能的(除非您要忽略它们,但是,为什么要这么麻烦？).例如,假设您使用以下一组标志:-Wstrict-prototypes -Wtraditional.
即使启用了两个警告,以下程序也会抱怨.
/tmp $ cat main.c
int main(int argc, char **argv) {
return 0;
}
/tmp $ gcc -Wstrict-prototypes -Wtraditional main.c
main.c: In function ‘main’:
main.c:1:5: warning: traditional C rejects ISO C style function definitions [-Wtraditional]
int main(int argc, char **argv) {
^
您可能会认为"好吧,我将使用旧式原型".不,这不行.
/tmp $ cat main.c
int main(argc, argv)
int argc;
char **argv;
{
return 0;
}
/tmp $ gcc -Wstrict-prototypes -Wtraditional main.c
main.c:1:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
int main(argc, argv)
^
不,不指定任何原型也是错误的,因为编译器也会抱怨.
/tmp $ cat main.c
int main() {
return 0;
}
/tmp $ gcc -Wstrict-prototypes -Wtraditional main.c
main.c:1:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
int main() {
^
如果在程序中定义任何函数,则不能使用所有标志,因为编译器会抱怨任何可以想象的函数定义.
对于C++,这是可能的(-Wtraditional标志不存在),并且可以编译非常简单的程序.要启用所有警告,请使用以下警告列表(可能是某些警告重复,因为我没有费心过滤启用的警告-Wall).
-Wabi -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Weffc++ -Wstrict-null-sentinel -Wno-non-template-friend -Wold-style-cast -Woverloaded-virtual -Wno-pmf-conversions -Wsign-promo -Wextra -Wall -Waddress -Waggregate-return -Warray-bounds -Wno-attributes -Wno-builtin-macro-redefined -Wc++0x-compat -Wcast-align -Wcast-qual -Wchar-subscripts -Wclobbered -Wcomment -Wconversion -Wcoverage-mismatch -Wno-deprecated -Wno-deprecated-declarations -Wdisabled-optimization -Wno-div-by-zero -Wempty-body -Wenum-compare -Wno-endif-labels -Wfatal-errors -Wfloat-equal -Wformat -Wformat=2 -Wno-format-contains-nul -Wno-format-extra-args -Wformat-nonliteral -Wformat-security -Wformat-y2k -Wignored-qualifiers -Winit-self -Winline -Wno-int-to-pointer-cast -Wno-invalid-offsetof -Winvalid-pch -Wunsafe-loop-optimizations -Wlogical-op -Wlong-long -Wmain -Wmissing-braces -Wmissing-field-initializers -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn -Wno-mudflap -Wno-multichar -Wnonnull -Wno-overflow -Woverlength-strings -Wpacked -Wpacked-bitfield-compat -Wpadded -Wparentheses -Wpointer-arith -Wredundant-decls -Wreturn-type -Wsequence-point -Wshadow -Wsign-compare -Wsign-conversion -Wstack-protector -Wstrict-aliasing=1 -Wstrict-overflow=5 -Wswitch -Wswitch-default -Wswitch-enum -Wsync-nand -Wsystem-headers -Wtrigraphs -Wtype-limits -Wundef -Wuninitialized -Wunknown-pragmas -Wno-pragmas -Wunreachable-code -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wunused-value -Wunused-variable -Wvariadic-macros -Wvla -Wvolatile-register-var -Wwrite-strings
有人创建了一套工具来确定给定GCC或Clang版本的完整警告集.
对于GCC,从此工具为编译器版本提供的完整警告列表中复制似乎是确保打开所有警告的唯一方法,因为(与Clang不同)GCC不提供.-Weverything
该工具似乎解析了c.optGCC源代码中的实际文件,因此其结果应该是确定的.
存储库还包含文本文件,其中包含为大多数GCC和Clang版本生成的警告列表(目前为Clang 3.2至3.7和GCC 3.4至5.3).
https://github.com/barro/compiler-warnings
编辑 2023：针对 GCC 12 进行了刷新。
我从其他帖子中收集了信息，并逐一测试了 C++ 库测试中的警告。
使用Haatschii 的列表以及他/她获取 GCC 11 完整列表的方法：
gcc -Wall -Wextra -Wpedantic -Q --help=warning
在所有这些警告中，有些警告不适用于 C++，因此这里是警告列表和一些适用于我的 C++ 项目测试的最小注释。
考虑到：
该列表基本上按字母顺序排列，并进行了一些最小的捆绑以节省垂直空间。作为奖励，它被格式化为在CMake项目中使用。
现在名单：
target_compile_options(
target
PRIVATE
$<$<AND:$<CXX_COMPILER_ID:GNU>,$<NOT:$<CUDA_COMPILER_ID:NVIDIA>>,$<NOT:$<CUDA_COMPILER_ID:Clang>>>:
-Werror
-Wall
-Wextra # (activates -Wunknown-pragmas)
-Wpedantic
-WNSObject-attribute # (gcc 12, not in 11)
# -Wabi=13 -Wabi-tag (maybe important when linking with very old libraries)
# -Wabsolute-value # C/ObjC only (gcc 12, not in 11)
-Waddress
# -Waddress-of-packed-member (gcc 11, not in gcc 8)
# -Waggregate-return (disallow return classes or structs, seems a C-compatibility warning)
-Waggressive-loop-optimizations
# -Waligned-new=all (gcc 12, not in 11)
# -Walloc-size-larger-than=<bytes> (gcc 12, not in 11)
-Walloc-zero # -Walloc-size-larger-than=<bytes>
-Walloca # -Walloca-larger-than=<number>
# -Wanalyzer-double-fclose -Wanalyzer-double-free -Wanalyzer-exposure-through-output-file -Wanalyzer-file-leak -Wanalyzer-free-of-non-heap -Wanalyzer-malloc-leak (gcc 11, not in gcc 9)
# -Wanalyzer-mismatching-deallocation (gcc 11, not in gcc 10)
# -Wanalyzer-null-argument -Wanalyzer-possible-null-argument -Wanalyzer-null-dereference (gcc 11, not in gcc 9)
# -Wanalyzer-possible-null-dereference (gcc 11, not in gcc 9)
# -Wanalyzer-shift-count-negative -Wanalyzer-shift-count-overflow (gcc 11, not in gcc 10)
# -Wanalyzer-stale-setjmp-buffer
# -Wanalyzer-tainted-allocation-size (gcc 12, not in 11)
# -Wanalyzer-tainted-array-index (gcc 11, not in gcc 9)
# -Wanalyzer-tainted-divisor -Wanalyzer-tainted-offset -Wanalyzer-tainted-size -Wanalyzer-too-complex -Wanalyzer-unsafe-call-within-signal-handler (gcc 12, not in 11)
# -Wanalyzer-unsafe-call-within-signal-handler -Wanalyzer-use-after-free -Wanalyzer-use-of-pointer-in-stale-stack-frame
# -Wanalyzer-write-to-const -Wanalyzer-write-to-string-literal (gcc 11, not in gcc 10)
# -Warith-conversion (gcc 11, not in gcc 9)
-Warray-bounds
# -Warray-bounds=<0,2> -Warray-compare (gcc 12, not in gcc 9)
# -Warray-parameter -Warray-parameter=<0,2> (gcc 11, not in gcc 10)
# -Wattribute-alias -Wattribute-alias=<0,2> (gcc 12, not in 11)
# -Wattribute-warning (gcc 9, not in 8)
-Wattributes
# -Wbad-function-cast (gcc 12, not in 11)
-Wbool-compare -Wbool-operation
# -Wbidi-chars -Wbidi-chars=any (gcc 12, not in 11)
-Wbuiltin-declaration-mismatch -Wbuiltin-macro-redefined
#-Wc++-compat
-Wc++0x-compat -Wc++11-compat -Wc++14-compat -Wc++17-compat -Wc++17-extensions -Wc++1z-compat
# -Wc++20-compat -Wc++20-extensions -Wc++23-extensions -Wc++2a-compat (gcc 11, not in gcc 9)
# -Wcannot-profile (gcc 9, not in gcc 8)
-Wcast-align=strict -Wcast-function-type
-Wcast-qual
-Wcatch-value #=<0, 3>
-Wchar-subscripts
# -Wchkp -Wclass-conversion -Wclass-memaccess (gcc 12, not in 11)
# -Wclobbered
# -Wcomma-subscript (gcc 12, not in 11)
# -Wcomment # (same as -Wcomments)
# -Wcompare-reals (gcc 12, not in 11)
-Wconditionally-supported
-Wconversion -Wconversion-null
-Wcoverage-mismatch -Wcpp
# -Wctad-maybe-unsupported # TODO(correaa) add ctad explicitly as necessary
-Wctor-dtor-privacy
-Wdangling-else
# -Wdangling-pointer (gcc 12, not in 11)
-Wdate-time
# -Wdeclaration-after-statement (gcc 12, not in 11)
-Wdelete-incomplete -Wdelete-non-virtual-dtor
-Wdeprecated
# -Wdeprecated-copy -Wdeprecated-copy-dtor (gcc 11, not in gcc 8)
-Wdeprecated-declarations
# -Wdeprecated-enum-enum-conversion -Wdeprecated-enum-float-conversion (gcc 11, not in gcc 10)
# -Wdesignated-init (gcc 12, not in 11)
-Wdisabled-optimization
# -Wdiscarded-array-qualifiers (gcc 12, not in 11)
-Wdiv-by-zero -Wdouble-promotion
# -Wduplicate-decl-specifier (gcc 12, not in 11)
-Wduplicated-branches -Wduplicated-cond
# -Weffc++ (doesn't allow some advanced techniques, such as CRTP)
-Wempty-body -Wendif-labels
-Wenum-compare
# -Wenum-conversion (gcc 11, not in gcc 10)
-Wexpansion-to-defined
# -Werror-implicit-function-declaration not for C++ (gcc 12, not in 11)
# -Wexceptions (gcc 11, not in gcc 10)
# -Wextra
-Wextra-semi
-Wfloat-conversion # -Wfloat-equal (disallows float equality)
-Wformat=2
# -Wformat-contains-nul (gcc 12, not in 11)
# -Wformat-diag (gcc 10, not in gcc 9)
-Wformat-extra-args -Wformat-nonliteral
# -Wformat-overflow=1
-Wformat-security -Wformat-signedness -Wformat-truncation -Wformat-y2k -Wformat-zero-length
-Wframe-address # -Wframe-larger-than=<byte-size>
-Wfree-nonheap-object -Whsa
-Wif-not-aligned
-Wignored-attributes -Wignored-qualifiers
# -Wimplicit (gcc 12, not in 11)
-Wimplicit-fallthrough#=3 # -Wimplicit-fallthrough=<0,5>
# -Wimplicit-function-declaration -Wimplicit-int (gcc 12, not in 11)
# -Winaccessible-base (gcc 12, not in 11)
# -Wincompatible-pointer-types -Winfinite-recursion -Winherited-variadic-ctor -Winit-list-lifetime (gcc 12, not in 11)
-Winit-self
# -Winline
# -Wint-conversion (gcc 12, not in 11)
-Wint-in-bool-context -Wint-to-pointer-cast
# -Winterference-size (gcc 12, not in 11)
# -Winvalid-imported-macros (gcc 11, not in gcc 10)
-Winvalid-memory-model -Winvalid-offsetof -Winvalid-pch
# -Wjump-misses-init (gcc 12, not in 11)
# -Wlarger-than=<byte-size> # (disallow large objects types? in executable)
-Wliteral-suffix
-Wlogical-not-parentheses -Wlogical-op
# -Wlong-long (C++98 warning)
-Wlto-type-mismatch -Wmain -Wmaybe-uninitialized
-Wmemset-elt-size -Wmemset-transposed-args
-Wmisleading-indentation
# -Wmismatched-dealloc -Wmismatched-new-delete (gcc 11, not in gcc 10)
# -Wmismatched-tags (gcc 11, not in gcc 9)
-Wmissing-attributes
-Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn
# -Wmissing-parameter-type (gcc 12, not in 11)
# -Wmissing-profile (gcc 11, not in gcc 8)
# -Wmissing-prototypes -Wmissing-requires -Wmissing-template-keyword (gcc 12, not in 11)
-Wmultichar
# -Wmultiple-inheritance (disallows composition by inheritance)
-Wmultistatement-macros
# -Wnamespaces (disallows use of namespaces, seems a C-tool)
-Wnarrowing
# -Wnested-externs (gcc 12, not in 11)
# -Wno-alloc-size-larger-than=<bytes> -Wframe-larger-than=<bytes> -Wno-larger-than<bytes> -Wstack-usage=<bytes> (gcc 112, not in 11)
-Wnoexcept -Wnoexcept-type
-Wnon-template-friend -Wnon-virtual-dtor
-Wnonnull -Wnonnull-compare
-Wnormalized #=nfc -Wnormalized=[none|id|nfc|nfkc]
-Wnull-dereference
-Wodr -Wold-style-cast
# -Wold-style-declaration -Wold-style-definition (gcc 12, not in 11)
# -Wopenacc-parallelism (gcc 12, not in 11)
-Wopenmp-simd -Woverflow
-Woverlength-strings -Woverloaded-virtual
# -Woverride-init -Woverride-init-side-effects (gcc 12, not in 11)
-Wpacked -Wpacked-bitfield-compat -Wpacked-not-aligned
# -Wpadded (disallows structs that need padding for alignment)
-Wparentheses
# -Wpedantic (see above)
# -Wpessimizing-move (gcc 11, not in gcc 8)
-Wplacement-new #=1 -Wplacement-new=<0,2>
-Wpmf-conversions
-Wpointer-arith -Wpointer-compare
# -Wpointer-sign -Wpointer-to-int-cast (gcc 12, not in 11)
-Wpragmas
# -Wprio-ctor-dtor (gcc 11, not in gcc 8)
-Wpsabi
# -Wrange-loop-construct (gcc 11, not in gcc 10)
-Wredundant-decls
# -Wredundant-move (gcc 11, not in gcc 8)
# -Wredundant-tags (gcc 11, not in gcc 9)
-Wregister
# -Wreorder (gcc 12, not in 11)
-Wreturn-local-addr -Wreturn-type
-Wrestrict -Wreorder
-Wscalar-storage-order -Wsequence-point
-Wshadow -Wshadow-compatible-local -Wshadow-local -Wshadow=compatible-local -Wshadow=local
-Wshift-count-negative -Wshift-count-overflow -Wshift-negative-value -Wshift-overflow #=1 -Wshift-overflow=<0,2>
-Wsign-compare -Wsign-conversion -Wsign-promo
-Wsized-deallocation
-Wsizeof-array-argument
# -Wsizeof-array-div (gcc 11, not in gcc 10)
-Wsizeof-pointer-div
-Wsizeof-pointer-memaccess
-Wstack-protector # -Wstack-usage=<byte-size>
-Wstrict-aliasing #=3 -Wstrict-aliasing=<0,3>
-Wstrict-null-sentinel #=1 -Wstrict-overflow=<0,5>
-Wstrict-overflow #=1 -Wstrict-overflow=<0,5>
# -Wstrict-prototypes (gcc 12, not in gcc 11)
# -Wstring-compare (gcc 11, not in gcc 9)
-Wstringop-overflow #=2 -Wstringop-overflow=<0,4>
# -Wstringop-overread (gcc 11, not in gcc 10)
-Wstringop-truncation
-Wsubobject-linkage
# -Wsuggest-attribute=cold (gcc 12, not in 11)
-Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=malloc -Wsuggest-attribute=noreturn
# -Wsuggest-attribute=pure
-Wsuggest-final-methods -Wsuggest-final-types
# -Wsuggest-override (gcc 12, not in gcc 11)
-Wswitch -Wswitch-bool -Wswitch-default -Wswitch-enum
# -Wswitch-outside-range (gcc 11, not in gcc 9)
-Wswitch-unreachable
-Wsync-nand -Wsynth
# -Wsystem-headers (expects system headers to be warning-compliant which they are not)
-Wtautological-compare
# -Wtemplates (disallows templates, C-tool)
# -Wterminate -Wtraditional -Wtraditional-conversion (gcc 12, not in 11)
-Wtrampolines -Wtrigraphs
# -Wtrivial-auto-var-init (gcc 12, not in 11)
# -Wtsan (gcc 11, not in 10)
-Wtype-limits -Wundef -Wuninitialized
-Wno-unknown-pragmas # (see above) -Wunknown-pragmas (other compilers need their own pragmas for their warnings)
-Wunreachable-code -Wunsafe-loop-optimizations
# -Wunsuffixed-float-constants (gcc 12, not in 11)
-Wunused -Wunused-but-set-parameter -Wunused-but-set-variable
# -Wunused-const-variable #=2 TODO(correaa) add [[maybe_unused]] to niebloids
-Wunused-function -Wunused-label -Wunused-local-typedefs -Wunused-macros -Wunused-parameter -Wunused-result -Wunused-value -Wunused-variable
# -Wuse-after-free # =<0,3> (gcc 12, not in 11)
-Wuseless-cast
-Wvarargs -Wvariadic-macros -Wvector-operation-performance
# -Wvexing-parse (gcc 11, not in gcc 10)
-Wvirtual-inheritance -Wvirtual-move-assign
-Wvla
# -Wvla-larger-than=<number> (gcc 12, not in 11)
# -Wvla-parameter (gcc 11, not in gcc 10)
# -Wvolatile (gcc 11, not in gcc 9)
-Wvolatile-register-var
-Wwrite-strings
-Wzero-as-null-pointer-constant
# -Wzero-length-bounds (gcc 12, not in 11)
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Gcc 4.3+现在有-Q --help =警告,你甚至可以指定--help = warnings,C来打印出与C相关的警告.
我刚刚写了一个m4模块来利用这个(也支持clang的-Weverything),参见wget_manywarnings.m4
如何使用它非常简单,基本上模块会打开每个警告标志.你根据需要删除警告 - 有些真的非常冗长.示例:configure.ac
如果你不使用autotools,你会发现代码打开m4模块中的所有禁用警告,这基本上是通过awk管道的gcc调用:
flags="-Wall -Wextra -Wformat=2 "$(gcc -Wall -Wextra -Wformat=2 -Q --help=warning,C|awk '{ if (($2 == "[disabled]" || $2 == "") && $1!~/=/ && $1~/^-W/&& $1!="-Wall") print $1 }'