Add a function to check if an argument list is too long.
This will be used in clang to decide if it should create an @file or not. It
will be tested on the clang side.
Patch by Nathan Froyd.
llvm-svn: 179285
diff --git a/llvm/lib/Support/Windows/Program.inc b/llvm/lib/Support/Windows/Program.inc
index 691d6d4..994a097 100644
--- a/llvm/lib/Support/Windows/Program.inc
+++ b/llvm/lib/Support/Windows/Program.inc
@@ -396,4 +396,20 @@
return make_error_code(errc::success);
}
+bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
+ // The documented max length of the command line passed to CreateProcess.
+ static const size_t MaxCommandStringLength = 32768;
+ size_t ArgLength = 0;
+ for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
+ I != E; ++I) {
+ // Account for the trailing space for every arg but the last one and the
+ // trailing NULL of the last argument.
+ ArgLength += ArgLenWithQuotes(*I) + 1;
+ if (ArgLength > MaxCommandStringLength) {
+ return false;
+ }
+ }
+ return true;
+}
+
}