如何通过#define指令检测LLVM及其版本？ [英] How to detect LLVM and its version through #define directives?

问题描述

这个问题很清楚我想。我试图写一个编译器检测头，以便能够包括在使用哪个编译器的应用程序信息和哪个版本。

这是代码的一部分I 'm using：

  / * GNU C编译器检测* / 
 #elif已定义__GNUC__ 
 #ifdef __MINGW32__ 
 #define COMPILERMinGW GCC％d。％d。％d
 #else 
 #define COMPILERGCC％d。％d。％d
 #endif 
 #define COMP_VERSION __GNUC__，__GNUC_MINOR__，__GNUC_PATCHLEVEL__ 
 #endif 
  

使用像这样：

  printf（Compiled usingCOMPILER\\\
，COMP_VERSION）; 
  

有没有办法检测LLVM及其版本？ __ llvm __ 和

__clang __ 宏是分别检查LLVM编译器（llvm-gcc或clang）或clang的正式方式。

__ has_feature 和 __ has_builtin 是使用clang时检查可选编译器功能的推荐方法，它们记录在此处。

请注意，您可以找到一个列表的gcc，llvm-gcc和clang的内置编译器宏：

  echo | clang -dM -E  -  
  

这将预处理一个空字符串，并输出编译器定义的所有宏。

The question is quite clear I think. I'm trying to write a compiler detection header to be able to include in the application information on which compiler was used and which version.

This is part of the code I'm using:

/* GNU C Compiler Detection */
#elif defined __GNUC__
    #ifdef __MINGW32__
        #define COMPILER "MinGW GCC %d.%d.%d"
    #else
        #define COMPILER "GCC %d.%d.%d"
    #endif
    #define COMP_VERSION __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__
#endif

Which could be used like this:

printf("  Compiled using " COMPILER "\n", COMP_VERSION);

Is there any way to detect LLVM and its version? And CLANG?

解决方案

The __llvm__ and __clang__ macros are the official way to check for an LLVM compiler (llvm-gcc or clang) or clang, respectively.

__has_feature and __has_builtin are the recommended way of checking for optional compiler features when using clang, they are documented here.

Note that you can find a list of the builtin compiler macros for gcc, llvm-gcc, and clang using:

echo | clang -dM -E -

This preprocesses an empty string and spits out all macros defined by the compiler.

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