[Driver] Reject -Wa,-mrelax-relocations= for non-x86

Similar to other target-specific -Wa, options.

Author: MaskRay

clang/lib/Driver/ToolChains/Clang.cpp

@@ -2620,11 +2620,18 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
           Value == "-mbig-obj")
         continue; // LLVM handles bigobj automatically
 
+      auto Equal = Value.split('=');
       switch (C.getDefaultToolChain().getArch()) {
       default:
         break;
       case llvm::Triple::x86:
       case llvm::Triple::x86_64:
+        if (Equal.first == "-mrelax-relocations" ||
+            Equal.first == "--mrelax-relocations") {
+          UseRelaxRelocations = Equal.second == "yes";
+          if (llvm::is_contained({"yes", "no"}, Equal.second))
+            continue;
+        }
         if (Value == "-msse2avx") {
           CmdArgs.push_back("-msse2avx");
           continue;
@@ -2641,10 +2648,10 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
       case llvm::Triple::thumbeb:
       case llvm::Triple::arm:
       case llvm::Triple::armeb:
-        if (Value.starts_with("-mimplicit-it=")) {
+        if (Equal.first == "-mimplicit-it") {
           // Only store the value; the last value set takes effect.
-          ImplicitIt = Value.split("=").second;
-          if (CheckARMImplicitITArg(ImplicitIt))
+          ImplicitIt = Equal.second;
+          if (CheckARMImplicitITArg(Equal.second))
             continue;
         }
         if (Value == "-mthumb")
@@ -2719,12 +2726,6 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
         Crel = false;
       } else if (Value == "--allow-experimental-crel") {
         ExperimentalCrel = true;
-      } else if (Value == "-mrelax-relocations=yes" ||
-                 Value == "--mrelax-relocations=yes") {
-        UseRelaxRelocations = true;
-      } else if (Value == "-mrelax-relocations=no" ||
-                 Value == "--mrelax-relocations=no") {
-        UseRelaxRelocations = false;
       } else if (Value.starts_with("-I")) {
         CmdArgs.push_back(Value.data());
         // We need to consume the next argument if the current arg is a plain

clang/test/Driver/ohos.c

@@ -7,7 +7,6 @@
 // RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot -fuse-ld=ld -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=soft 2>&1 \
 // RUN:     | FileCheck -check-prefixes=CHECK,CHECK-ARM-A7-SOFT %s
 // CHECK: {{.*}}clang{{.*}}" "-cc1"
-// CHECK-NOT: "--mrelax-relocations"
 // CHECK-NOT: "-munwind-tables"
 // CHECK: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK: "-isysroot" "[[SYSROOT:[^"]+]]"

clang/test/Driver/relax.c

@@ -1,4 +1,10 @@
-// RUN: %clang -### -c -integrated-as -Wa,--mrelax-relocations=no %s 2>&1 | FileCheck  %s
+// RUN: %clang -### --target=x86_64 -c -Wa,--mrelax-relocations=no %s 2>&1 | FileCheck  %s
 
 // CHECK: "-cc1"
 // CHECK: "-mrelax-relocations=no"
+
+// RUN: not %clang -### --target=x86_64 -c -Wa,-mrelax-relocations=x %s 2>&1 | FileCheck %s --check-prefix=ERR
+// ERR: error: unsupported argument '-mrelax-relocations=x' to option '-Wa,'
+
+// RUN: not %clang -### --target=aarch64 -c -Wa,-mrelax-relocations=no %s 2>&1 | FileCheck %s --check-prefix=ERR2
+// ERR2: error: unsupported argument '-mrelax-relocations=no' to option '-Wa,'