[clang] [clang] replaced the usage of `asctime` with `strftime` (PR #99075)

[Yi-Chi Lee via cfe-commits]

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@@ -1722,10 +1722,12 @@ void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
     // MSVC, ICC, GCC, VisualAge C++ extension.  The generated string should be
     // of the form "Ddd Mmm dd hh::mm::ss yyyy", which is returned by asctime.
     const char *Result;
+    char TimeString[std::size("Ddd Mmm dd hh:mm:ss yyyy")];
     if (getPreprocessorOpts().SourceDateEpoch) {
       time_t TT = *getPreprocessorOpts().SourceDateEpoch;
       std::tm *TM = std::gmtime(&TT);
-      Result = asctime(TM);
+      strftime(TimeString, std::size(TimeString), "%c", TM);
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yichi170 wrote:

I see. Do you mean if the result of `strftime` is zero, `Result` have to be set as "???...?"?

https://github.com/llvm/llvm-project/pull/99075