113 lines
3.3 KiB
Markdown
113 lines
3.3 KiB
Markdown
# GCC 编译连接参数
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## 1.编译参数
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### 1.1.编译警告控制参数
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#### Werror
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-Werror:将所有的警告当成错误进行处理。
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#### Wall
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-Wall:打开 gcc 的所有警告,主要包括以下部分:
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```blk
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-Waddress
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-Warray-bounds=1 (only with -O2)
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-Wbool-compare
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-Wbool-operation
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-Wc++11-compat-Wc++14-compat
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-Wcatch-value (C++ and Objective-C++ only)
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-Wchar-subscripts:警告如果数组下标有char类型。 这是错误的常见原因,因为程序员经常忘记这种类型是在某些机器上签名的。
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-Wcomment
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-Wduplicate-decl-specifier (C and Objective-C only)
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-Wenum-compare (in C/ObjC; this is on by default in C++)
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-Wformat
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-Wformat-security:开启类型不匹配警告。
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-Wint-in-bool-context
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-Wimplicit (C and Objective-C only)
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-Wimplicit-int (C and Objective-C only)
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-Wimplicit-function-declaration (C and Objective-C only)
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-Winit-self (only for C++)
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-Wlogical-not-parentheses
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-Wmain (only for C/ObjC and unless -ffreestanding)
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-Wmaybe-uninitialized
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-Wmemset-elt-size
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-Wmemset-transposed-args
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-Wmisleading-indentation (only for C/C++)
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-Wmissing-attributes
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-Wmissing-braces (only for C/ObjC)
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-Wmultistatement-macros
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-Wnarrowing (only for C++)
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-Wnonnull
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-Wnonnull-compare
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-Wopenmp-simd
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-Wparentheses
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-Wpointer-sign
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-Wreorder
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-Wrestrict
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-Wreturn-type
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-Wsequence-point
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-Wsizeof-pointer-div
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-Wsizeof-pointer-memaccess
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-Wstrict-aliasing
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-Wstrict-overflow=1
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-Wswitch
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-Wtautological-compare
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-Wtrigraphs
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-Wuninitialized
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-Wunknown-pragmas
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-Wunused-function:开启未使用的函数警告。
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-Wunused-label
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-Wunused-value
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-Wunused-variable
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-Wvolatile-register-var
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```
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每个警告参数都有对应的“-Wno-”参数实现相反的控制,例如:
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```blk
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-Wno-unused-parameter:关闭未使用的参数警告。
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-Wno-unused-function:关闭未使用的函数警告。
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-Wno-format-security:关闭类型不匹配警告。
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-Wno-sign-compare:关闭有符号数和无符号数比较警告。
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```
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在同时开启 -Wall 和 -Werror 时将使编译警告变为编译错误,此时语法检查非常严格,如需放开某些限制,可结合“-Wno-”类参数使用,例如:-Wall -Werror -Wno-unused-parameter -Wno-unused-function。
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#### Wextra
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-Wextra:启用一些未由-Wall启用的额外警告标志。 (此选项过去称为-W ,旧名称仍然受支持,但更新的名称更具描述性。)
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```blk
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-Wclobbered
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-Wcast-function-type
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-Wempty-body
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-Wignored-qualifiers
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-Wimplicit-fallthrough=3
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-Wmissing-field-initializers
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-Wmissing-parameter-type (C only)
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-Wold-style-declaration (C only)
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-Woverride-init
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-Wsign-compare (C only):开启有符号数和无符号数比较警告。
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-Wtype-limits
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-Wuninitialized
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-Wshift-negative-value (in C++03 and in C99 and newer)
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-Wunused-parameter (only with -Wunused or -Wall):开启未使用的参数警告。
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-Wunused-but-set-parameter (only with -Wunused or -Wall)
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```
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选项 -Wextra 还会打印以下情况的警告消息:
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指针与整数零与< , <= , >或>= 。
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(仅限C ++)枚举器和非枚举器都出现在条件表达式中。
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(仅限C ++)不明确的虚拟基础。
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(仅限C ++)为已声明为register的数组下标。
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(仅限C ++)取得已声明register的变量的地址。
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(仅限C ++)基类不在派生类的复制构造函数中初始化。
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## 2. 外部参考资料
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1. [gcc警告选项汇总](https://blog.csdn.net/qq_17308321/article/details/79979514)
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