[AIX] Disable -gsplit-dwarf as it is unsupported at the moment on AIX

[aditya-chaudhary1]

-gsplit-dwarf flag causes the internal compiler error on the AIX. This PR aims to disable the -gsplit-dwarf flag on the AIX platform, as it is unsupported at the moment.

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Author: Aditya Chaudhary (adityankit)

Changes

-gsplit-dwarf flag causes the internal compiler error on the AIX. This PR aims to disable the -gsplit-dwarf flag on the AIX platform, as it is unsupported at the moment.
This is a temporary workaround.

---

Full diff: https://github.com/llvm/llvm-project/pull/158199.diff

2 Files Affected:

• (modified) clang/lib/Driver/ToolChains/Clang.cpp (+7)
• (added) clang/test/Driver/aix-gsplit-dwarf.c (+12)

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 946b1e39af3b9..a72bdedd7317b 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4393,6 +4393,13 @@ renderDebugOptions(const ToolChain &TC, const Driver &D, const llvm::Triple &T,
   // object file generation and no IR generation, -gN should not be needed. So
   // allow -gsplit-dwarf with either -gN or IR input.
   if (IRInput || Args.hasArg(options::OPT_g_Group)) {
+    // FIXME: -gsplit-dwarf on AIX is currently unimplemented.
+    if (TC.getTriple().isOSAIX() && Args.hasArg(options::OPT_gsplit_dwarf)) {
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << Args.getLastArg(options::OPT_gsplit_dwarf)->getSpelling()
+          << TC.getTriple().str();
+      return;
+    }
     Arg *SplitDWARFArg;
     DwarfFission = getDebugFissionKind(D, Args, SplitDWARFArg);
     if (DwarfFission != DwarfFissionKind::None &&
diff --git a/clang/test/Driver/aix-gsplit-dwarf.c b/clang/test/Driver/aix-gsplit-dwarf.c
new file mode 100644
index 0000000000000..5332bc07e9b55
--- /dev/null
+++ b/clang/test/Driver/aix-gsplit-dwarf.c
@@ -0,0 +1,12 @@
+// Verify error message is emitted for `-gsplit-dwarf` on AIX 
+// as it's unsupported at the moment.
+
+// RUN: not %clang -target powerpc-ibm-aix -gdwarf-4 -gsplit-dwarf %s 2>&1 \
+// RUN: | FileCheck %s --check-prefix=UNSUP_OPT_AIX
+// RUN: not %clang -target powerpc64-ibm-aix -gdwarf-4 -gsplit-dwarf %s 2>&1 \
+// RUN: | FileCheck %s --check-prefix=UNSUP_OPT_AIX64
+
+// UNSUP_OPT_AIX: error: unsupported option '-gsplit-dwarf' for target 'powerpc-ibm-aix'
+// UNSUP_OPT_AIX64: error: unsupported option '-gsplit-dwarf' for target 'powerpc64-ibm-aix'
+
+int main(){return 0;}
\ No newline at end of file

[tonykuttai]

LGTM

[daltenty]

LGTM, thanks!

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