海城市网站建设,幸福人寿保险公司官方网站电子保单打印,企业做网站建设的好处,百度wordpress插件下载地址各个层次的gcc警告 从上到下覆盖 变量(代码)级:指定某个变量警告 int a __attribute__ ((unused)); 指定该变量为未使用的.即使这个变量没有被使用,编译时也会忽略则个警告输出. 文件级:在源代码文件中诊断(忽略/警告) 语法:
#pragma GCC diagnostic [er…各个层次的gcc警告 从上到下覆盖 变量(代码)级:指定某个变量警告 int a __attribute__ ((unused)); 指定该变量为未使用的.即使这个变量没有被使用,编译时也会忽略则个警告输出. 文件级:在源代码文件中诊断(忽略/警告) 语法:
#pragma GCC diagnostic [error|warning|ignored] -W警告选项 诊断-忽略:(关闭警告) #pragma GCC diagnostic ignored -Wunused
#pragma GCC diagnostic ignored -Wunused-parameter 诊断-警告:(开启警告) #pragma GCC diagnostic warning -Wunused
#pragma GCC diagnostic warning -Wunused-parameter 诊断-错误:(开启警告-升级为错误) #pragma GCC diagnostic error -Wunused
#pragma GCC diagnostic error -Wunused-parameter 用法: 在文件开头处关闭警告,在文件结尾出再开启警告,这样可以忽略该文件中的指定警告. 项目级:命令行/编译参数指定 警告: gcc main.c -Wall 忽略: gcc mian.c -Wall -Wno-unused-parameter //开去all警告,但是忽略 -unused-parameter警告 选项格式: -W[no-]警告选项 如 : -Wno-unused-parameter # no- 表示诊断时忽略这个警告
来源https://github.com/zodiac1111/note/blob/master/note/gcc/gcc-ignored-warning.markdown#%E6%96%87%E4%BB%B6%E7%BA%A7%E5%9C%A8%E6%BA%90%E4%BB%A3%E7%A0%81%E6%96%87%E4%BB%B6%E4%B8%AD%E8%AF%8A%E6%96%AD%E5%BF%BD%E7%95%A5%E8%AD%A6%E5%91%8A 6.59.10 Diagnostic Pragmas
GCC allows the user to selectively enable or disable certain types of diagnostics, and change the kind of the diagnostic. For example, a projects policy might require that all sources compile with -Werror but certain files might have exceptions allowing specific types of warnings. Or, a project might selectively enable diagnostics and treat them as errors depending on which preprocessor macros are defined.
#pragma GCC diagnostic kind optionModifies the disposition of a diagnostic. Note that not all diagnostics are modifiable; at the moment only warnings (normally controlled by ‘-W...’) can be controlled, and not all of them. Use -fdiagnostics-show-option to determine which diagnostics are controllable and which option controls them. kind is ‘error’ to treat this diagnostic as an error, ‘warning’ to treat it like a warning (even if -Werror is in effect), or ‘ignored’ if the diagnostic is to be ignored. option is a double quoted string that matches the command-line option. span stylefont-size:18px; #pragma GCC diagnostic warning -Wformat#pragma GCC diagnostic error -Wformat#pragma GCC diagnostic ignored -Wformat
/span Note that these pragmas override any command-line options. GCC keeps track of the location of each pragma, and issues diagnostics according to the state as of that point in the source file. Thus, pragmas occurring after a line do not affect diagnostics caused by that line. #pragma GCC diagnostic push#pragma GCC diagnostic popCauses GCC to remember the state of the diagnostics as of each push, and restore to that point at each pop. If a pop has no matching push, the command-line options are restored.span stylefont-size:18px; #pragma GCC diagnostic error -Wuninitializedfoo(a); /* error is given for this one */#pragma GCC diagnostic push#pragma GCC diagnostic ignored -Wuninitializedfoo(b); /* no diagnostic for this one */#pragma GCC diagnostic popfoo(c); /* error is given for this one */#pragma GCC diagnostic popfoo(d); /* depends on command-line options */
/spanGCC also offers a simple mechanism for printing messages during compilation.
#pragma message stringPrints string as a compiler message on compilation. The message is informational only, and is neither a compilation warning nor an error.span stylefont-size:18px; #pragma message Compiling __FILE__ ...
/span string may be parenthesized, and is printed with location information. For example, span stylefont-size:18px; #define DO_PRAGMA(x) _Pragma (#x)#define TODO(x) DO_PRAGMA(message (TODO - #x))TODO(Remember to fix this)
/span prints ‘/tmp/file.c:4: note: #pragma message: TODO - Remember to fix this’. 来源http://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html
