gccの警告オプションの調べ方
提供: C言語入門
2016年8月12日 (金) 18:56時点におけるDaemon (トーク | 投稿記録)による版 (ページの作成:「gcc コンパイラには、いろいろな警告オプションがあります。警告オプションにより、プログラムの問題を発見することがで...」)
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gcc コンパイラには、いろいろな警告オプションがあります。警告オプションにより、プログラムの問題を発見することができます。どのオプションが有効になっているのか、確認する方法を紹介します。
読み方
- gcc
- じーしーしー
概要
gcc コンパイラには、いろいろな警告オプションがあります。警告オプションにより、プログラムの問題を発見することができます。どのオプションが有効になっているのか、確認する方法を紹介します。
警告オプションをまとめて有効にする便利な -Wall や -Wextra などがありますが、それらを設定したときに、どのオプションが有効になっているのか簡単に調べることができます。
警告オプションの確認のやり方
以下のコマンドラインで、どの警告オプションが有効になっているか確認できます。
$ gcc -Q --help=warnings
以下のコマンドラインの出力を比較してみると、オプションによる違いがわかります。
$ gcc -Wall -Q --help=warnings $ gcc -Wall -Wextra -Q --help=warnings
実行例
以下は、gcc バージョン 5.3.0 の例になります。
$ gcc5 --version gcc5 (FreeBSD Ports Collection) 5.3.0 Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ gcc5 -Q --help=warnings The following options control compiler warning messages: --all-warnings --extra-warnings -W -Wabi [disabled] -Wabi-tag [disabled] -Wabi= -Waddress [disabled] -Waggregate-return [disabled] -Waggressive-loop-optimizations [enabled] -Waliasing [disabled] -Walign-commons [enabled] -Wall -Wampersand [disabled] -Warray-bounds [disabled] -Warray-bounds= 0 -Warray-temporaries [disabled] -Wassign-intercept [disabled] -Wattributes [enabled] -Wbad-function-cast [disabled] -Wbool-compare [disabled] -Wbuiltin-macro-redefined [enabled] -Wc++-compat [disabled] -Wc++0x-compat [disabled] -Wc++11-compat -Wc++14-compat [disabled] -Wc-binding-type [disabled] -Wc90-c99-compat [enabled] -Wc99-c11-compat [enabled] -Wcast-align [disabled] -Wcast-qual [disabled] -Wchar-subscripts [disabled] -Wcharacter-truncation [disabled] -Wchkp [disabled] -Wclobbered [disabled] -Wcomment [disabled] -Wcomments -Wcompare-reals [disabled] -Wconditionally-supported [disabled] -Wconversion [disabled] -Wconversion-extra [disabled] -Wconversion-null [enabled] -Wcoverage-mismatch [enabled] -Wcpp [enabled] -Wctor-dtor-privacy [disabled] -Wdate-time [disabled] -Wdeclaration-after-statement [enabled] -Wdelete-incomplete [enabled] -Wdelete-non-virtual-dtor [disabled] -Wdeprecated [enabled] -Wdeprecated-declarations [enabled] -Wdesignated-init [enabled] -Wdisabled-optimization [disabled] -Wdiscarded-array-qualifiers [enabled] -Wdiscarded-qualifiers [enabled] -Wdiv-by-zero [enabled] -Wdouble-promotion [disabled] -Weffc++ [disabled] -Wempty-body [disabled] -Wendif-labels [enabled] -Wenum-compare [enabled] -Werror-implicit-function-declaration -Wextra [disabled] -Wfloat-equal [disabled] -Wformat -Wformat-contains-nul [disabled] -Wformat-extra-args [disabled] -Wformat-nonliteral [disabled] -Wformat-security [disabled] -Wformat-signedness [disabled] -Wformat-y2k [disabled] -Wformat-zero-length [disabled] -Wformat= 0 -Wfree-nonheap-object [enabled] -Wfunction-elimination [disabled] -Wignored-qualifiers [disabled] -Wimplicit [disabled] -Wimplicit-function-declaration [enabled] -Wimplicit-int [enabled] -Wimplicit-interface [disabled] -Wimplicit-procedure [disabled] -Wincompatible-pointer-types [enabled] -Winherited-variadic-ctor [enabled] -Winit-self [disabled] -Winline [disabled] -Wint-conversion [enabled] -Wint-to-pointer-cast [enabled] -Wintrinsic-shadow [disabled] -Wintrinsics-std [disabled] -Winvalid-memory-model [enabled] -Winvalid-offsetof [enabled] -Winvalid-pch [disabled] -Wjump-misses-init [disabled] -Wlarger-than- -Wlarger-than=<number> -Wline-truncation [enabled] -Wliteral-suffix [enabled] -Wlogical-not-parentheses [disabled] -Wlogical-op [disabled] -Wlong-long [enabled] -Wmain [enabled] -Wmaybe-uninitialized [disabled] -Wmemset-transposed-args [disabled] -Wmissing-braces [disabled] -Wmissing-declarations [disabled] -Wmissing-field-initializers [disabled] -Wmissing-include-dirs [disabled] -Wmissing-parameter-type [disabled] -Wmissing-prototypes [disabled] -Wmultichar [disabled] -Wnarrowing [enabled] -Wnested-externs [disabled] -Wnoexcept [disabled] -Wnon-template-friend [enabled] -Wnon-virtual-dtor [disabled] -Wnonnull [disabled] -Wnormalized=<none|id|nfc|nfkc> nfc -Wodr [enabled] -Wold-style-cast [disabled] -Wold-style-declaration [disabled] -Wold-style-definition [disabled] -Wopenmp-simd [disabled] -Woverflow [enabled] -Woverlength-strings [disabled] -Woverloaded-virtual [disabled] -Woverride-init [disabled] -Wpacked [disabled] -Wpacked-bitfield-compat [enabled] -Wpadded [disabled] -Wparentheses [disabled] -Wpedantic [disabled] -Wpmf-conversions [enabled] -Wpointer-arith [disabled] -Wpointer-sign [disabled] -Wpointer-to-int-cast [enabled] -Wpragmas [enabled] -Wproperty-assign-default [enabled] -Wprotocol [enabled] -Wreal-q-constant [disabled] -Wrealloc-lhs [disabled] -Wrealloc-lhs-all [disabled] -Wredundant-decls [disabled] -Wreorder [disabled] -Wreturn-local-addr [enabled] -Wreturn-type [disabled] -Wselector [disabled] -Wsequence-point [disabled] -Wshadow [disabled] -Wshadow-ivar [enabled] -Wshift-count-negative [enabled] -Wshift-count-overflow [enabled] -Wsign-compare [disabled] -Wsign-promo [disabled] -Wsized-deallocation [disabled] -Wsizeof-array-argument [enabled] -Wsizeof-pointer-memaccess [disabled] -Wstack-protector [disabled] -Wstack-usage= 0xffffffff -Wstrict-aliasing -Wstrict-aliasing= 0 -Wstrict-null-sentinel [disabled] -Wstrict-overflow -Wstrict-overflow= 0 -Wstrict-prototypes [disabled] -Wstrict-selector-match [disabled] -Wsuggest-attribute=const [disabled] -Wsuggest-attribute=format [disabled] -Wsuggest-attribute=noreturn [disabled] -Wsuggest-attribute=pure [disabled] -Wsuggest-final-methods [disabled] -Wsuggest-final-types [disabled] -Wsuggest-override [disabled] -Wsurprising [disabled] -Wswitch [disabled] -Wswitch-bool [enabled] -Wswitch-default [disabled] -Wswitch-enum [disabled] -Wsync-nand [enabled] -Wsynth [disabled] -Wsystem-headers [disabled] -Wtabs [disabled] -Wtarget-lifetime [disabled] -Wtraditional [disabled] -Wtraditional-conversion [disabled] -Wtrampolines [disabled] -Wtrigraphs [enabled] -Wtype-limits [disabled] -Wundeclared-selector [disabled] -Wundef [disabled] -Wunderflow [enabled] -Wuninitialized [disabled] -Wunknown-pragmas [disabled] -Wunsafe-loop-optimizations [disabled] -Wunsuffixed-float-constants [disabled] -Wunused [disabled] -Wunused-but-set-parameter [disabled] -Wunused-but-set-variable [disabled] -Wunused-dummy-argument [disabled] -Wunused-function [disabled] -Wunused-label [disabled] -Wunused-local-typedefs [disabled] -Wunused-macros [disabled] -Wunused-parameter [disabled] -Wunused-result [enabled] -Wunused-value [disabled] -Wunused-variable [disabled] -Wuse-without-only [disabled] -Wuseless-cast [disabled] -Wvarargs [enabled] -Wvariadic-macros [disabled] -Wvector-operation-performance [disabled] -Wvirtual-move-assign [enabled] -Wvla [enabled] -Wvolatile-register-var [disabled] -Wwrite-strings [disabled] -Wzero-as-null-pointer-constant [disabled] -Wzerotrip [disabled] -frequire-return-statement [enabled]
関連項目
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