1 files changed, 17 insertions, 0 deletions
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 656e595..bcd5359 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -94,7 +94,9 @@
 #include <cassert>
 #include <cstddef>
 #include <cstring>
+#include <ctime>
 #include <fstream>
+#include <limits>
 #include <memory>
 #include <string>
 #include <tuple>
@@ -4307,6 +4309,21 @@ static bool ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
     Opts.addRemappedFile(Split.first, Split.second);
   }
 
+  if (const char *Epoch = std::getenv("SOURCE_DATE_EPOCH")) {
+    // SOURCE_DATE_EPOCH, if specified, must be a non-negative decimal integer.
+    // On time64 systems, pick 253402300799 (the UNIX timestamp of
+    // 9999-12-31T23:59:59Z) as the upper bound.
+    const uint64_t MaxTimestamp =
+        std::min<uint64_t>(std::numeric_limits<time_t>::max(), 253402300799);
+    uint64_t V;
+    if (StringRef(Epoch).getAsInteger(10, V) || V > MaxTimestamp) {
+      Diags.Report(diag::err_fe_invalid_source_date_epoch)
+          << Epoch << MaxTimestamp;
+    } else {
+      Opts.SourceDateEpoch = V;
+    }
+  }
+
   // Always avoid lexing editor placeholders when we're just running the
   // preprocessor as we never want to emit the
   // "editor placeholder in source file" error in PP only mode.