看了一下google CoverStory的代码，有一个地方很有意思：
// These are the various document types used by CoverStory.
// Included in both Obj-C and plist sources.
// A little magic to get CPP to turn things into cstrings for the code but have
// the strings raw for the plists. The reason we need this is if we just put
// them in quotes (cstrings) then we’d get those quotes in the plists, which we
// don’t want.
#define STRINGIFY(x) #x
#define TO_STRING(x) STRINGIFY(x)
#define kGCOVTypeNameRaw GNU Compiler Coverage File
#define kGCOVTypeName TO_STRING(kGCOVTypeNameRaw)
然后在使用的地方
NSLog(@kGCOVTypeName);
或者
std::cout<
就能把GNU Compiler Coverage File值输出来了，
但如果用NSLog(@#kGCOVTypeNameRaw);则不行。
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