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-rw-r--r--clang/lib/Frontend/CompilerInvocation.cpp24
1 files changed, 24 insertions, 0 deletions
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 8312abc..948fe08 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -2841,6 +2841,30 @@ static bool ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
}
Opts.ProgramAction = *ProgramAction;
+
+ // Catch common mistakes when multiple actions are specified for cc1 (e.g.
+ // -S -emit-llvm means -emit-llvm while -emit-llvm -S means -S). However, to
+ // support driver `-c -Xclang ACTION` (-cc1 -emit-llvm file -main-file-name
+ // X ACTION), we suppress the error when the two actions are separated by
+ // -main-file-name.
+ //
+ // As an exception, accept composable -ast-dump*.
+ if (!A->getSpelling().starts_with("-ast-dump")) {
+ const Arg *SavedAction = nullptr;
+ for (const Arg *AA :
+ Args.filtered(OPT_Action_Group, OPT_main_file_name)) {
+ if (AA->getOption().matches(OPT_main_file_name)) {
+ SavedAction = nullptr;
+ } else if (!SavedAction) {
+ SavedAction = AA;
+ } else {
+ if (!A->getOption().matches(OPT_ast_dump_EQ))
+ Diags.Report(diag::err_fe_invalid_multiple_actions)
+ << SavedAction->getSpelling() << A->getSpelling();
+ break;
+ }
+ }
+ }
}
if (const Arg* A = Args.getLastArg(OPT_plugin)) {