[PATCH] D148817: [RISCV] Add Tag_RISCV_arch attribute by default when using clang as an assembler.

[Craig Topper via Phabricator via cfe-commits]

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Can be disabled with -mno-default-build-attributes just like ARM.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148817

Files:
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/Driver/riscv-default-build-attributes.s


Index: clang/test/Driver/riscv-default-build-attributes.s
===================================================================
--- /dev/null
+++ clang/test/Driver/riscv-default-build-attributes.s
@@ -0,0 +1,22 @@
+// Enabled by default for assembly
+// RUN: %clang --target=riscv64 -### %s 2>&1 \
+// RUN:    | FileCheck %s -check-prefix CHECK-ENABLED
+
+// Can be forced on or off for assembly.
+// RUN: %clang --target=riscv64 -### %s 2>&1 -mno-default-build-attributes \
+// RUN:    | FileCheck %s -check-prefix CHECK-DISABLED
+// RUN: %clang --target=riscv64 -### %s 2>&1 -mdefault-build-attributes \
+// RUN:    | FileCheck %s -check-prefix CHECK-ENABLED
+
+
+// Option ignored C/C++ (since we always emit hardware and ABI build attributes
+// during codegen).
+// RUN: %clang --target=riscv64 -### -x c %s -mdefault-build-attributes 2>&1 \
+// RUN:    | FileCheck %s -check-prefix CHECK-DISABLED
+// RUN: %clang --target=riscv64 -### -x c++ %s -mdefault-build-attributes 2>&1 \
+// RUN:    | FileCheck %s -check-prefix CHECK-DISABLED
+
+// CHECK-DISABLED-NOT: "-riscv-add-build-attributes"
+// CHECK-ENABLED: "-riscv-add-build-attributes"
+// expected-warning {{argument unused during compilation: '-mno-default-build-attributes'}}
+// expected-warning {{argument unused during compilation: '-mno-default-build-attributes'}}
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -7903,6 +7903,12 @@
 
   CmdArgs.push_back("-target-abi");
   CmdArgs.push_back(ABIName.data());
+
+  if (Args.hasFlag(options::OPT_mdefault_build_attributes,
+                   options::OPT_mno_default_build_attributes, true)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-riscv-add-build-attributes");
+  }
 }
 
 void ClangAs::ConstructJob(Compilation &C, const JobAction &JA,


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