c - 预处理器宏 GCC : pasting x and x does not give a valid preprocessing token

Question

#define  PATH  "yagh/headers/"
#define  FILNAME  "includefile"


#define CONCAT(a__, b__) CONCAT_DO(a__, b__)
#define CONCAT_DO(a__, b__) a__##b__
#define CONCATTHREE(a__, b__, c__) CONCAT(CONCAT(a__, b__), c__)
#define STRINGIFY(a__) #a__


#include STRINGIFY(CONCATTHREE(PATH  ,FILNAME  ,.h));

此宏在 VS 编译器中运行良好，但在 GCC 编译器上无法编译:

Error: error: pasting "/" and "includefile" does not give a valid preprocessing token

对于某些包含文件，它会给出错误:

Error: pasting "includefile" and "." does not give a valid preprocessing token

Answer 1

GCC 在执行 C 标准方面更加严格:参见 Differences in Macro ## concatenation operator between Visual-C++ and gcc和 http://gcc.gnu.org/onlinedocs/gcc-4.3.3/cpp/Concatenation.html#Concatenation .

您可以尝试 #include STRINGIFY(PATH FILNAME.h)(FILNAME 和 .h 之间缺少空格很重要)- - 这对我适用于 gcc 4.6.3。