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Add comment explaining this mysterious macro name. 

llvm-svn: 285631
This commit is contained in:
Richard Smith 2016-10-31 20:25:52 +00:00
parent 1f7deb8908
commit 90f454aeb9
1 changed files with 3 additions and 0 deletions
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3
clang/lib/Frontend/InitPreprocessor.cpp
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@ -992,6 +992,9 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
}
if (TI.hasInt128Type() && LangOpts.CPlusPlus && LangOpts.GNUMode) {
// For each extended integer type, g++ defines a macro mapping the
// index of the type (0 in this case) in some list of extended types
// to the type.
Builder.defineMacro("__GLIBCXX_TYPE_INT_N_0", "__int128");
Builder.defineMacro("__GLIBCXX_BITSIZE_INT_N_0", "128");
}