[RISCV][Driver] Add support for `-m` flag to linker job of Baremetal toolchain #134442

quic-garvgupt · 2025-04-04T20:13:12Z

This PR is 6th patch in the series of patches of merging RISCVToolchain object into BareMetal toolchain object.

RFC:
https://discourse.llvm.org/t/merging-riscvtoolchain-and-baremetal-toolchains/75524

quic-garvgupt · 2025-04-04T20:13:37Z

[RISCV] Integrate RISCV target in baremetal toolchain object and deprecate RISCVToolchain object #121831
[RISCV][Driver] Add support for -m flag to linker job of Baremetal toolchain #134442 👈 (View in Graphite)
[Driver] Forward sysroot from Driver to linker in BareMetal ToolChain Object #132808
[Driver] Add option to force undefined symbols during linking in BareMetal toolchain object. #132807
[Driver] Fix link order of BareMetal toolchain object #132806
[Driver] Add support for crtbegin.o, crtend.o and libgloss lib to BareMetal toolchain object #121830
[Driver] Add support for GCC installation detection in Baremetal toolchain #121829
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llvmbot · 2025-04-04T20:16:08Z

@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-driver

Author: Garvit Gupta (quic-garvgupt)

Changes

Full diff: https://github.com/llvm/llvm-project/pull/134442.diff

2 Files Affected:

(modified) clang/lib/Driver/ToolChains/BareMetal.cpp (+8-5)
(modified) clang/test/Driver/baremetal.cpp (+22-22)

diff --git a/clang/lib/Driver/ToolChains/BareMetal.cpp b/clang/lib/Driver/ToolChains/BareMetal.cpp
index 6c9695ca5c2cd..e4292779c546a 100644
--- a/clang/lib/Driver/ToolChains/BareMetal.cpp
+++ b/clang/lib/Driver/ToolChains/BareMetal.cpp
@@ -534,8 +534,14 @@ void baremetal::Linker::ConstructJob(Compilation &C, const JobAction &JA,
 
   CmdArgs.push_back("-Bstatic");
 
-  if (TC.getTriple().isRISCV() && Args.hasArg(options::OPT_mno_relax))
-    CmdArgs.push_back("--no-relax");
+  if (Triple.isRISCV()) {
+    if (Args.hasArg(options::OPT_mno_relax))
+      CmdArgs.push_back("--no-relax");
+    CmdArgs.push_back("-m");
+    CmdArgs.push_back(Arch == llvm::Triple::riscv64 ? "elf64lriscv"
+                                                    : "elf32lriscv");
+    CmdArgs.push_back("-X");
+  }
 
   if (Triple.isARM() || Triple.isThumb()) {
     bool IsBigEndian = arm::isARMBigEndian(Triple, Args);
@@ -622,9 +628,6 @@ void baremetal::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       NeedCRTs)
     CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath(CRTEnd)));
 
-  if (TC.getTriple().isRISCV())
-    CmdArgs.push_back("-X");
-
   // The R_ARM_TARGET2 relocation must be treated as R_ARM_REL32 on arm*-*-elf
   // and arm*-*-eabi (the default is R_ARM_GOT_PREL, used on arm*-*-linux and
   // arm*-*-*bsd).
diff --git a/clang/test/Driver/baremetal.cpp b/clang/test/Driver/baremetal.cpp
index 3b841d3f0af04..a9a484f84a006 100644
--- a/clang/test/Driver/baremetal.cpp
+++ b/clang/test/Driver/baremetal.cpp
@@ -250,13 +250,13 @@
 // CHECK-RV64-SAME: "-x" "c++" "{{.*}}baremetal.cpp"
 // CHECK-RV64-NEXT: ld{{(.exe)?}}"
 // CHECK-RV64-SAME: "--sysroot={{.*}}/Inputs/basic_riscv64_tree/riscv64-unknown-elf"
-// CHECK-RV64-SAME: "-Bstatic"
+// CHECK-RV64-SAME: "-Bstatic" "-m" "elf64lriscv"  "-X"
 // CHECK-RV64-SAME: "-Lsome{{[/\\]+}}directory{{[/\\]+}}user{{[/\\]+}}asked{{[/\\]+}}for"
 // CHECK-RV64-SAME: "-L[[SYSROOT:[^"]+]]{{[/\\]+}}lib"
 // CHECK-RV64-SAME:"{{.*}}.o"
 // CHECK-RV64-SAME: "{{[^"]*}}libclang_rt.builtins.a"
 // CHECK-RV64-SAME: "-lc"
-// CHECK-RV64-SAME: "-X" "-o" "{{.*}}.tmp.out"
+// CHECK-RV64-SAME: "-o" "{{.*}}.tmp.out"
 
 // RUN: %clangxx %s -### --target=riscv64-unknown-elf 2>&1 \
 // RUN:     --sysroot=%S/Inputs/basic_riscv64_tree/riscv64-unknown-elf \
@@ -264,13 +264,13 @@
 // CHECK-RV64-DEFAULTCXX: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-RV64-DEFAULTCXX: ld{{(.exe)?}}"
 // CHECK-RV64-DEFAULTCXX-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf"
-// CHECK-RV64-DEFAULTCXX-SAME: -Bstatic"
+// CHECK-RV64-DEFAULTCXX-SAME: -Bstatic" "-m" "elf64lriscv"  "-X"
 // CHECK-RV64-DEFAULTCXX-SAME: "-L{{[^"]*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf{{[/\\]+}}lib"
 // CHECK-RV64-DEFAULTCXX-SAME:"{{.*}}.o"
 // CHECK-RV64-DEFAULTCXX-SAME: "-lc++" "-lm"
 // CHECK-RV64-DEFAULTCXX-SAME: "{{[^"]*}}libclang_rt.builtins.a"
 // CHECK-RV64-DEFAULTCXX-SAME: "-lc"
-// CHECK-RV64-DEFAULTCXX-SAME: "-X" "-o" "a.out"
+// CHECK-RV64-DEFAULTCXX-SAME: "-o" "a.out"
 
 // RUN: %clangxx %s -### --target=riscv64-unknown-elf 2>&1 \
 // RUN:     --sysroot=%S/Inputs/basic_riscv64_tree/riscv64-unknown-elf \
@@ -281,13 +281,13 @@
 // CHECK-RV64-LIBCXX-SAME: "-internal-isystem" "{{[^"]+}}{{[/\\]+}}include{{[/\\]+}}c++{{[/\\]+}}v1"
 // CHECK-RV64-LIBCXX: ld{{(.exe)?}}"
 // CHECK-RV64-LIBCXX-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf"
-// CHECK-RV64-LIBCXX-SAME: "-Bstatic"
+// CHECK-RV64-LIBCXX-SAME: "-Bstatic" "-m" "elf64lriscv"  "-X"
 // CHECK-RV64-LIBCXX-SAME: "-L{{[^"]*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf{{[/\\]+}}lib"
 // CHECK-RV64-LIBCXX-SAME:"{{.*}}.o"
 // CHECK-RV64-LIBCXX-SAME: "-lc++" "-lm"
 // CHECK-RV64-LIBCXX-SAME: "{{[^"]*}}libclang_rt.builtins.a"
 // CHECK-RV64-LIBCXX-SAME: "-lc"
-// CHECK-RV64-LIBCXX-SAME: "-X" "-o" "a.out"
+// CHECK-RV64-LIBCXX-SAME: "-o" "a.out"
 
 // RUN: %clangxx %s -### 2>&1 --target=riscv64-unknown-elf \
 // RUN:     --sysroot=%S/Inputs/basic_riscv64_tree/riscv64-unknown-elf \
@@ -298,13 +298,13 @@
 // CHECK-RV64-LIBSTDCXX-SAME: "-internal-isystem" "{{[^"]+}}{{[/\\]+}}include{{[/\\]+}}c++{{[/\\]+}}8.0.1"
 // CHECK-RV64-LIBSTDCXX: ld{{(.exe)?}}"
 // CHECK-RV64-LIBSTDCXX-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf"
-// CHECK-RV64-LIBSTDCXX-SAME: "-Bstatic"
+// CHECK-RV64-LIBSTDCXX-SAME: "-Bstatic" "-m" "elf64lriscv"  "-X"
 // CHECK-RV64-LIBSTDCXX-SAME: "-L{{[^"]*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf{{[/\\]+}}lib"
 // CHECK-RV64-LIBSTDCXX-SAME: "{{.*}}.o"
 // CHECK-RV64-LIBSTDCXX-SAME: "-lstdc++" "-lm"
 // CHECK-RV64-LIBSTDCXX-SAME: "{{[^"]*}}libclang_rt.builtins.a"
 // CHECK-RV64-LIBSTDCXX-SAME: "-lc"
-// CHECK-RV64-LIBSTDCXX-SAME: "-X" "-o" "a.out"
+// CHECK-RV64-LIBSTDCXX-SAME: "-o" "a.out"
 
 // RUN: %clang %s -### 2>&1 --target=riscv32-unknown-elf \
 // RUN:     -L some/directory/user/asked/for \
@@ -318,13 +318,13 @@
 // CHECK-RV32-SAME: "-x" "c++" "{{.*}}baremetal.cpp"
 // CHECK-RV32-NEXT: ld{{(.exe)?}}"
 // CHECK-RV32-SAME: "--sysroot={{.*}}/Inputs/basic_riscv32_tree/riscv32-unknown-elf"
-// CHECK-RV32-SAME: "-Bstatic"
+// CHECK-RV32-SAME: "-Bstatic" "-m" "elf32lriscv"  "-X"
 // CHECK-RV32-SAME: "-Lsome{{[/\\]+}}directory{{[/\\]+}}user{{[/\\]+}}asked{{[/\\]+}}for"
 // CHECK-RV32-SAME: "-L[[SYSROOT:[^"]+]]{{[/\\]+}}lib"
 // CHECK-RV32-SAME: "{{.*}}.o"
 // CHECK-RV32-SAME: "{{[^"]*}}libclang_rt.builtins.a"
 // CHECK-RV32-SAME: "-lc"
-// CHECK-RV32-SAME: "-X" "-o" "a.out"
+// CHECK-RV32-SAME: "-o" "a.out"
 
 // RUN: %clangxx %s -### 2>&1 --target=riscv32-unknown-elf \
 // RUN:     --sysroot=%S/Inputs/basic_riscv32_tree/riscv32-unknown-elf \
@@ -332,13 +332,13 @@
 // CHECK-RV32-DEFAULTCXX: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-RV32-DEFAULTCXX: ld{{(.exe)?}}"
 // CHECK-RV32-DEFAULTCXX-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf"
-// CHECK-RV32-DEFAULTCXX-SAME: "-Bstatic"
+// CHECK-RV32-DEFAULTCXX-SAME: "-Bstatic" "-m" "elf32lriscv"  "-X"
 // CHECK-RV32-DEFAULTCXX-SAME: "-L{{[^"]*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf{{[/\\]+}}lib"
 // CHECK-RV32-DEFAULTCXX-SAME: "{{.*}}.o"
 // CHECK-RV32-DEFAULTCXX-SAME: "-lc++" "-lm"
 // CHECK-RV32-DEFAULTCXX-SAME: "{{[^"]*}}libclang_rt.builtins.a"
 // CHECK-RV32-DEFAULTCXX-SAME: "-lc"
-// CHECK-RV32-DEFAULTCXX-SAME: "-X" "-o" "a.out"
+// CHECK-RV32-DEFAULTCXX-SAME: "-o" "a.out"
 
 // RUN: %clangxx %s -### 2>&1 --target=riscv32-unknown-elf \
 // RUN:     --sysroot=%S/Inputs/basic_riscv32_tree/riscv32-unknown-elf \
@@ -349,12 +349,12 @@
 // CHECK-RV32-LIBCXX-SAME: "-internal-isystem" "{{[^"]+}}{{[/\\]+}}include{{[/\\]+}}c++{{[/\\]+}}v1"
 // CHECK-RV32-LIBCXX: ld{{(.exe)?}}"
 // CHECK-RV32-LIBCXX-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf"
-// CHECK-RV32-LIBCXX-SAME: "-Bstatic"
+// CHECK-RV32-LIBCXX-SAME: "-Bstatic" "-m" "elf32lriscv"  "-X"
 // CHECK-RV32-LIBCXX-SAME: "-L{{[^"]*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf{{[/\\]+}}lib"
 // CHECK-RV32-LIBCXX-SAME: "{{.*}}.o"
 // CHECK-RV32-LIBCXX-SAME: "-lc++" "-lm"
 // CHECK-RV32-LIBCXX-SAME: "{{[^"]*}}libclang_rt.builtins.a"
-// CHECK-RV32-LIBCXX-SAME: "-X" "-o" "a.out"
+// CHECK-RV32-LIBCXX-SAME: "-o" "a.out"
 
 // RUN: %clangxx %s -### 2>&1 --target=riscv32-unknown-elf \
 // RUN:     --sysroot=%S/Inputs/basic_riscv32_tree/riscv32-unknown-elf \
@@ -365,13 +365,13 @@
 // CHECK-RV32-LIBSTDCXX-SAME: "-internal-isystem" "{{[^"]+}}{{[/\\]+}}include{{[/\\]+}}c++{{[/\\]+}}8.0.1"
 // CHECK-RV32-LIBSTDCXX: ld{{(.exe)?}}"
 // CHECK-RV32-LIBSTDCXX-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf"
-// CHECK-RV32-LIBSTDCXX-SAME: "-Bstatic"
+// CHECK-RV32-LIBSTDCXX-SAME: "-Bstatic" "-m" "elf32lriscv"  "-X"
 // CHECK-RV32-LIBSTDCXX-SAME: "-L{{[^"]*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf{{[/\\]+}}lib"
 // CHECK-RV32-LIBSTDCXX-SAME: "{{.*}}.o"
 // CHECK-RV32-LIBSTDCXX-SAME: "-lstdc++" "-lm"
 // CHECK-RV32-LIBSTDCXX-SAME: "{{[^"]*}}libclang_rt.builtins.a"
 // CHECK-RV32-LIBSTDCXX-SAME: "-lc"
-// CHECK-RV32-LIBSTDCXX-SAME: "-X" "-o" "a.out"
+// CHECK-RV32-LIBSTDCXX-SAME: "-o" "a.out"
 
 // RUN: %clang %s -### 2>&1 --target=riscv64-unknown-elf \
 // RUN:     -nostdlibinc -nobuiltininc \
@@ -390,7 +390,7 @@
 // CHECK-RV64-NDL: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-RV64-NDL: ld{{(.exe)?}}"
 // CHECK-RV64-NDL-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf"
-// CHECK-RV64-NDL-SAME: "-Bstatic"
+// CHECK-RV64-NDL-SAME: "-Bstatic" "-m" "elf64lriscv"  "-X"
 // CHECK-RV64-NDL-SAME: "-L{{[^"]*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf{{[/\\]+}}lib"
 
 // RUN: %clang %s -### 2>&1 --target=riscv64-unknown-elf \
@@ -411,7 +411,7 @@
 // CHECK-RV64FD-SAME: "-x" "c++" "{{.*}}baremetal.cpp"
 // CHECK-RV64FD-NEXT: ld{{(.exe)?}}"
 // CHECK-RV64FD-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv64_tree{{[/\\]+}}riscv64-unknown-elf"
-// CHECK-RV64FD-SAME: "-Bstatic"
+// CHECK-RV64FD-SAME: "-Bstatic" "-m" "elf64lriscv"  "-X"
 // CHECK-RV64FD-SAME: "-L[[SYSROOT:[^"]+]]{{[/\\]+}}rv64imafdc{{[/\\]+}}lp64d{{[/\\]+}}lib"
 
 // RUN: %clang %s -### 2>&1 --target=riscv32-unknown-elf \
@@ -432,7 +432,7 @@
 // CHECK-RV32I-SAME: "-x" "c++" "{{.*}}baremetal.cpp"
 // CHECK-RV32I-NEXT: ld{{(.exe)?}}"
 // CHECK-RV32I-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf"
-// CHECK-RV32I-SAME: "-Bstatic"
+// CHECK-RV32I-SAME: "-Bstatic" "-m" "elf32lriscv"  "-X"
 // CHECK-RV32I-SAME: "-L[[SYSROOT:[^"]+]]{{[/\\]+}}rv32i{{[/\\]+}}ilp32{{[/\\]+}}lib"
 
 // RUN: %clang %s -### 2>&1 --target=riscv32-unknown-elf \
@@ -453,7 +453,7 @@
 // CHECK-RV32IM-SAME: "-x" "c++" "{{.*}}baremetal.cpp"
 // CHECK-RV32IM-NEXT: ld{{(.exe)?}}"
 // CHECK-RV32IM-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf"
-// CHECK-RV32IM-SAME: "-Bstatic"
+// CHECK-RV32IM-SAME: "-Bstatic" "-m" "elf32lriscv"  "-X"
 // CHECK-RV32IM-SAME: "-L[[SYSROOT:[^"]+]]{{[/\\]+}}rv32im{{[/\\]+}}ilp32{{[/\\]+}}lib"
 
 // RUN: %clang %s -### 2>&1 --target=riscv32-unknown-elf \
@@ -469,7 +469,7 @@
 // CHECK-RV32IAC-SAME: "-x" "c++" "{{.*}}baremetal.cpp"
 // CHECK-RV32IAC-NEXT: ld{{(.exe)?}}"
 // CHECK-RV32IAC-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf"
-// CHECK-RV32IAC-SAME: "-Bstatic"
+// CHECK-RV32IAC-SAME: "-Bstatic" "-m" "elf32lriscv"  "-X"
 // CHECK-RV32IAC-SAME: "-L[[SYSROOT:[^"]+]]{{[/\\]+}}rv32iac{{[/\\]+}}ilp32{{[/\\]+}}lib"
 
 // RUN: %clang %s -### 2>&1 --target=riscv32-unknown-elf -march=rv32imafc -mabi=ilp32f \
@@ -492,7 +492,7 @@
 // CHECK-RV32IMAFC-SAME: "-x" "c++" "{{.*}}baremetal.cpp"
 // CHECK-RV32IMAFC-NEXT: ld{{(.exe)?}}"
 // CHECK-RV32IMAFC-SAME: "--sysroot={{.*}}{{[/\\]+}}Inputs{{[/\\]+}}basic_riscv32_tree{{[/\\]+}}riscv32-unknown-elf"
-// CHECK-RV32IMAFC-SAME: "-Bstatic"
+// CHECK-RV32IMAFC-SAME: "-Bstatic" "-m" "elf32lriscv"  "-X"
 // CHECK-RV32IMAFC-SAME: "-L[[SYSROOT:[^"]+]]{{[/\\]+}}rv32imafc{{[/\\]+}}ilp32f{{[/\\]+}}lib"
 
 // RUN: %clang -no-canonical-prefixes %s -### --target=powerpc-unknown-eabi 2>&1 \

quic-garvgupt · 2025-04-10T05:42:41Z

Gentle Ping! This PR is a split of another existing PR #121831 and I think can be quickly reviewed

clang/lib/Driver/ToolChains/BareMetal.cpp

github-actions · 2025-04-22T18:56:51Z

✅ With the latest revision this PR passed the C/C++ code formatter.

clang/lib/Driver/ToolChains/BareMetal.cpp

…toolchain. Change-Id: Ifce8a3a7f1df9c12561d35ca3c923595e3619428

quic-garvgupt mentioned this pull request Apr 4, 2025

[Driver] Forward sysroot from Driver to linker in BareMetal ToolChain Object #132808

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quic-garvgupt changed the title ~~[RISCV][Driver] Add riscv emulation mode to linker job of BareMetal toolchain~~ [RISCV][Driver] Add support for -m flag to linker job of Baremetal toolchain Jun 16, 2025

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[RISCV][Driver] Add support for -m flag to linker job of Baremetal …

9d48ea7

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[RISCV][Driver] Add support for `-m` flag to linker job of Baremetal toolchain #134442

[RISCV][Driver] Add support for `-m` flag to linker job of Baremetal toolchain #134442

quic-garvgupt commented Apr 4, 2025 •

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quic-garvgupt commented Apr 4, 2025 •

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llvmbot commented Apr 4, 2025 •

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github-actions bot commented Apr 22, 2025 •

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