[clang] Fix --print-libgcc-file-name on Darwin platforms (PR #98325)

[Louis Dionne via cfe-commits]

================
@@ -0,0 +1,55 @@
+// Test the output of -print-libgcc-file-name on Darwin.
+
+//
+// All platforms
+//
+
+// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name \
+// RUN:     --target=x86_64-apple-macos \
+// RUN:     -resource-dir=%S/Inputs/resource_dir 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-MACOS %s
+// CHECK-CLANGRT-MACOS: libclang_rt.osx.a
+
+// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name \
+// RUN:     --target=arm64-apple-ios \
+// RUN:     -resource-dir=%S/Inputs/resource_dir 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-IOS %s
+// CHECK-CLANGRT-IOS: libclang_rt.ios.a
+
+// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name \
+// RUN:     --target=arm64-apple-watchos \
+// RUN:     -resource-dir=%S/Inputs/resource_dir 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-WATCHOS %s
+// CHECK-CLANGRT-WATCHOS: libclang_rt.watchos.a
+
+// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name \
+// RUN:     --target=arm64-apple-tvos \
+// RUN:     -resource-dir=%S/Inputs/resource_dir 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-TVOS %s
+// CHECK-CLANGRT-TVOS: libclang_rt.tvos.a
+
+// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name \
+// RUN:     --target=arm64-apple-driverkit \
+// RUN:     -resource-dir=%S/Inputs/resource_dir 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-DRIVERKIT %s
+// CHECK-CLANGRT-DRIVERKIT: libclang_rt.driverkit.a
+
+// TODO add simulators
+
+//
+// Check the cc_kext variants
+//
+
+// TODO
+
+//
+// Check the sanitizer and profile variants
+//
+
+// TODO
----------------
ldionne wrote:

I'm actually not sure what to do about sanitizers. I am figuring out which libraries we're actually linking by running this command and looking at what we link:

```
echo | xcrun --sdk <SDK> clang++ -### -fsanitize=address -xc++ -
```

For the sanitizers, I see that we link both `libclang_rt.osx.a` and `libclang_rt.asan_osx_dynamic.dylib`. I am not certain what we should output as the result of `-print-libgcc-file-name`.

https://github.com/llvm/llvm-project/pull/98325