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Reland "[clang][driver] Emit a warning if -xc/-xc++ is after the last input file" 

This reverts commit ba59476515.
This commit is contained in:
Yi Kong 2022-03-16 14:06:23 +08:00
parent 34ce42fe4d
commit e2a1f8ec27
3 changed files with 18 additions and 0 deletions
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3
clang/include/clang/Basic/DiagnosticDriverKinds.td
View File

@ -365,6 +365,9 @@ def warn_drv_preprocessed_input_file_unused : Warning<
def warn_drv_unused_argument : Warning<
"argument unused during compilation: '%0'">,
InGroup<UnusedCommandLineArgument>;
def warn_drv_unused_x : Warning<
"'-x %0' after last input file has no effect">,
InGroup<UnusedCommandLineArgument>;
def warn_drv_empty_joined_argument : Warning<
"joined argument expects additional value: '%0'">,
InGroup<UnusedCommandLineArgument>;

8
clang/lib/Driver/Driver.cpp
View File

@ -2308,6 +2308,14 @@ void Driver::BuildInputs(const ToolChain &TC, DerivedArgList &Args,
assert(!Args.hasArg(options::OPT_x) && "-x and /TC or /TP is not allowed");
}
// Warn -x after last input file has no effect
{
Arg *LastXArg = Args.getLastArgNoClaim(options::OPT_x);
Arg *LastInputArg = Args.getLastArgNoClaim(options::OPT_INPUT);
if (LastXArg && LastInputArg && LastInputArg->getIndex() < LastXArg->getIndex())
Diag(clang::diag::warn_drv_unused_x) << LastXArg->getValue();
}
for (Arg *A : Args) {
if (A->getOption().getKind() == Option::InputClass) {
const char *Value = A->getValue();

7
clang/test/Driver/x-args.c Normal file
View File

@ -0,0 +1,7 @@
// RUN: %clang -fsyntax-only -Werror -xc %s
// RUN: %clang -fsyntax-only -Werror %s -xc %s
// RUN: %clang -fsyntax-only %s -xc++ -fsyntax-only 2>&1 | FileCheck %s
// RUN: %clang -fsyntax-only -xc %s -xc++ -fsyntax-only 2>&1 | FileCheck %s
// RUN: %clang -fsyntax-only %s -xc %s -xc++ -fsyntax-only 2>&1 | FileCheck %s
// CHECK: '-x c++' after last input file has no effect