[PATCH] D54214: [RISCV] Set triple based on -march flag

[Simon Cook via Phabricator via cfe-commits]

simoncook updated this revision to Diff 212772.
simoncook added a comment.
Herald added subscribers: s.egerton, lenary, Jim, benna, psnobl.
Herald added a project: clang.

Rebase on top of tree.

I've noticed that without this flag calling riscv32-unknown-elf-clang -march=rv64i will still produce a rv32 binary, which is unlike GCC's behavior


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D54214/new/

https://reviews.llvm.org/D54214

Files:
  clang/lib/Driver/Driver.cpp
  clang/test/Driver/riscv-arch.c


Index: clang/test/Driver/riscv-arch.c
===================================================================
--- clang/test/Driver/riscv-arch.c
+++ clang/test/Driver/riscv-arch.c
@@ -315,3 +315,15 @@
 // RUN: -fsyntax-only 2>&1 | FileCheck -check-prefix=RV32-X-S-SX-INVAL %s
 // RV32-X-S-SX-INVAL: error: invalid arch name 'rv32ixabc_sdef_sxghi',
 // RV32-X-S-SX-INVAL: unsupported non-standard user-level extension 'xabc'
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32i -### %s \
+// RUN: -fsyntax-only 2>&1 | FileCheck -check-prefix=RV32-TARGET %s
+// RUN: %clang -target riscv64-unknown-elf -march=rv32i -### %s \
+// RUN: -fsyntax-only 2>&1 | FileCheck -check-prefix=RV32-TARGET %s
+// RV32-TARGET: "-triple" "riscv32-unknown-unknown-elf"
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv64i -### %s \
+// RUN: -fsyntax-only 2>&1 | FileCheck -check-prefix=RV64-TARGET %s
+// RUN: %clang -target riscv64-unknown-elf -march=rv64i -### %s \
+// RUN: -fsyntax-only 2>&1 | FileCheck -check-prefix=RV64-TARGET %s
+// RV64-TARGET: "-triple" "riscv64-unknown-unknown-elf"
Index: clang/lib/Driver/Driver.cpp
===================================================================
--- clang/lib/Driver/Driver.cpp
+++ clang/lib/Driver/Driver.cpp
@@ -537,6 +537,17 @@
     }
   }
 
+  // If target is RISC-V adjust the target triple according to
+  // provided architecture name
+  A = Args.getLastArg(options::OPT_march_EQ);
+  if (A && Target.isRISCV()) {
+    StringRef ArchName = A->getValue();
+    if (ArchName.startswith_lower("rv32"))
+      Target.setArch(llvm::Triple::riscv32);
+    else if (ArchName.startswith_lower("rv64"))
+      Target.setArch(llvm::Triple::riscv64);
+  }
+
   return Target;
 }
 


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