[PATCH] D153691: [Driver][ARM] Warn about -mabi= for assembler input

[Fangrui Song via Phabricator via cfe-commits]

MaskRay updated this revision to Diff 534668.
MaskRay marked an inline comment as done.
MaskRay added a comment.

Thanks for the comments. Improved comments.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D153691/new/

https://reviews.llvm.org/D153691

Files:
  clang/lib/Driver/ToolChains/Arch/ARM.cpp
  clang/test/Driver/arm-abi.c


Index: clang/test/Driver/arm-abi.c
===================================================================
--- clang/test/Driver/arm-abi.c
+++ clang/test/Driver/arm-abi.c
@@ -61,3 +61,9 @@
 // CHECK-APCS-GNU: "-target-abi" "apcs-gnu"
 // CHECK-AAPCS: "-target-abi" "aapcs"
 // CHECK-AAPCS-LINUX: "-target-abi" "aapcs-linux"
+
+// RUN: %clang --target=arm---gnueabi -mabi=aapcs -x assembler %s -### -o /dev/null 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ASM %s
+
+/// The combination -x assember & -mabi is not implemented, but for GCC compatibility we accept with a warning.
+// CHECK-ASM: warning: argument unused during compilation: '-mabi={{.*}}'
Index: clang/lib/Driver/ToolChains/Arch/ARM.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Arch/ARM.cpp
+++ clang/lib/Driver/ToolChains/Arch/ARM.cpp
@@ -524,6 +524,12 @@
         }
       }
     }
+
+    // The integrated assembler doesn't implement e_flags setting behavior in
+    // GNU assembler -meabi=gnu (gcc -mabi={apcs-gnu,atpcs}). For compatibility
+    // we accept but warn.
+    if (Arg *A = Args.getLastArgNoClaim(options::OPT_mabi_EQ))
+      A->ignoreTargetSpecific();
   }
 
   if (getReadTPMode(D, Args, Triple, ForAS) == ReadTPMode::TPIDRURW)


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