[PATCH] D145141: [Driver] Reject -march= for ppc

[Fangrui Song via Phabricator via cfe-commits]

MaskRay created this revision.
MaskRay added reviewers: PowerPC, nemanjai.
Herald added subscribers: shchenz, fedor.sergeev, kbarton, jyknight.
Herald added a project: All.
MaskRay requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Clang -march= for ppc triples currently leads to an
-Wunused-command-line-argument warning but GCC rejects -march=.

  error: unrecognized command-line option ‘-march=xxx’

Let's reject -march= as well similar to the Sparc change D130273 <https://reviews.llvm.org/D130273>.

Close https://github.com/llvm/llvm-project/issues/57587


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145141

Files:
  clang/lib/Driver/ToolChains/Arch/PPC.cpp
  clang/lib/Driver/ToolChains/Arch/PPC.h
  clang/lib/Driver/ToolChains/CommonArgs.cpp
  clang/test/Driver/ppc-cpus.c


Index: clang/test/Driver/ppc-cpus.c
===================================================================
--- clang/test/Driver/ppc-cpus.c
+++ clang/test/Driver/ppc-cpus.c
@@ -37,3 +37,6 @@
 // RUN: %clang -### -c -target powerpc64 %s -mcpu=405     2>&1 | FileCheck %s --check-prefix=GENERIC
 //
 // GENERIC: "-target-cpu" "ppc64"
+
+// RUN: %clang -### -c --target=powerpc64 %s -march=generic 2>&1 | FileCheck --check-prefix=MARCH %s
+// MARCH: error: unsupported option '-march=' for target 'powerpc64'
Index: clang/lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -410,7 +410,7 @@
   case llvm::Triple::ppcle:
   case llvm::Triple::ppc64:
   case llvm::Triple::ppc64le:
-    return ppc::getPPCTargetCPU(Args, T);
+    return ppc::getPPCTargetCPU(D, Args, T);
 
   case llvm::Triple::csky:
     if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
Index: clang/lib/Driver/ToolChains/Arch/PPC.h
===================================================================
--- clang/lib/Driver/ToolChains/Arch/PPC.h
+++ clang/lib/Driver/ToolChains/Arch/PPC.h
@@ -35,7 +35,7 @@
 
 FloatABI getPPCFloatABI(const Driver &D, const llvm::opt::ArgList &Args);
 
-std::string getPPCTargetCPU(const llvm::opt::ArgList &Args,
+std::string getPPCTargetCPU(const Driver &D, const llvm::opt::ArgList &Args,
                             const llvm::Triple &T);
 const char *getPPCAsmModeForCPU(StringRef Name);
 ReadGOTPtrMode getPPCReadGOTPtrMode(const Driver &D, const llvm::Triple &Triple,
Index: clang/lib/Driver/ToolChains/Arch/PPC.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Arch/PPC.cpp
+++ clang/lib/Driver/ToolChains/Arch/PPC.cpp
@@ -35,7 +35,13 @@
 }
 
 /// getPPCTargetCPU - Get the (LLVM) name of the PowerPC cpu we are targeting.
-std::string ppc::getPPCTargetCPU(const ArgList &Args, const llvm::Triple &T) {
+std::string ppc::getPPCTargetCPU(const Driver &D, const ArgList &Args,
+                                 const llvm::Triple &T) {
+  if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_march_EQ)) {
+    D.Diag(diag::err_drv_unsupported_opt_for_target)
+        << A->getSpelling() << T.getTriple();
+  }
+
   if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ)) {
     StringRef CPUName = A->getValue();
 


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D145141.501759.patch
Type: text/x-patch
Size: 2449 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20230302/fc6c2b4a/attachment.bin>