[Driver] Use AddRunTimeLibs on Solaris (#137596)

When linking `libomp.so` on Solaris, I encountered
```
clang: warning: argument unused during compilation: '-static-libgcc' [-Wunused-command-line-argument]

```
This happens because `Solaris.cpp` (`solaris::Linker::ConstructJob`)
links `-lgcc_s` and `-lgcc` on its own instead of using the common
`CommonArgs.cpp` (`tools::AddRunTimeLibs`) which handles
`-static-libgcc` out of the box.

This patch switches to `AddRunTimeLibs` and adds a test for
`-static-libgcc` handling. In `solaris-ld.c`, a few tests had to be
adjusted because `-lgcc` is now linked before `-lgcc_s`.

Tested on `amd64-pc-solaris2.11` and `sparcv9-sun-solaris2.11`.

Author: rorth

clang/lib/Driver/ToolChains/Solaris.cpp

@@ -243,13 +243,10 @@ void solaris::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       CmdArgs.push_back("-latomic");
       addAsNeededOption(ToolChain, Args, CmdArgs, false);
     }
-    addAsNeededOption(ToolChain, Args, CmdArgs, true);
-    CmdArgs.push_back("-lgcc_s");
-    addAsNeededOption(ToolChain, Args, CmdArgs, false);
+
+    AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
     CmdArgs.push_back("-lc");
-    if (!Args.hasArg(options::OPT_shared)) {
-      CmdArgs.push_back("-lgcc");
-    }
+
     const SanitizerArgs &SA = ToolChain.getSanitizerArgs(Args);
     if (NeedsSanitizerDeps) {
       linkSanitizerRuntimeDeps(ToolChain, Args, CmdArgs);

clang/test/Driver/solaris-ld.c

@@ -20,10 +20,10 @@
 // CHECK-LD-SPARC32-SAME: "-L[[SYSROOT]]/usr/lib"
 // CHECK-LD: "-z" "ignore" "-latomic" "-z" "record"
 // CHECK-GLD: "--as-needed" "-latomic" "--no-as-needed"
+// CHECK-LD-SPARC32-SAME: "-lgcc"
 // CHECK-LD: "-z" "ignore" "-lgcc_s" "-z" "record"
 // CHECK-GLD: "--as-needed" "-lgcc_s" "--no-as-needed"
 // CHECK-LD-SPARC32-SAME: "-lc"
-// CHECK-LD-SPARC32-SAME: "-lgcc"
 // CHECK-LD-SPARC32-SAME: "[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2{{/|\\\\}}crtend.o"
 // CHECK-LD-SPARC32-SAME: "[[SYSROOT]]/usr/lib{{/|\\\\}}crtn.o"
 
@@ -42,9 +42,9 @@
 // CHECK-LD-SPARC64-SAME: "-L[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2/../../../sparcv9"
 // CHECK-LD-SPARC64-SAME: "-L[[SYSROOT]]/usr/lib/sparcv9"
 // CHECK-LD-SPARC64-NOT:  "-latomic"
+// CHECK-LD-SPARC64-SAME: "-lgcc"
 // CHECK-LD-SPARC64-SAME: "-lgcc_s"
 // CHECK-LD-SPARC64-SAME: "-lc"
-// CHECK-LD-SPARC64-SAME: "-lgcc"
 // CHECK-LD-SPARC64-SAME: "[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2/sparcv9{{/|\\\\}}crtend.o"
 // CHECK-LD-SPARC64-SAME: "[[SYSROOT]]/usr/lib/sparcv9{{/|\\\\}}crtn.o"
 
@@ -63,9 +63,9 @@
 // CHECK-LD-X32-SAME: "-L[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4/../../.."
 // CHECK-LD-X32-SAME: "-L[[SYSROOT]]/usr/lib"
 // CHECK-LD-X32-NOT:  "-latomic"
+// CHECK-LD-X32-SAME: "-lgcc"
 // CHECK-LD-X32-SAME: "-lgcc_s"
 // CHECK-LD-X32-SAME: "-lc"
-// CHECK-LD-X32-SAME: "-lgcc"
 // CHECK-LD-X32-SAME: "[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4{{/|\\\\}}crtend.o"
 // CHECK-LD-X32-SAME: "[[SYSROOT]]/usr/lib{{/|\\\\}}crtn.o"
 
@@ -85,9 +85,9 @@
 // CHECK-LD-X64-SAME: "-L[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4/../../../amd64"
 // CHECK-LD-X64-SAME: "-L[[SYSROOT]]/usr/lib/amd64"
 // CHECK-LD-X64-NOT:  "-latomic"
+// CHECK-LD-X64-SAME: "-lgcc"
 // CHECK-LD-X64-SAME: "-lgcc_s"
 // CHECK-LD-X64-SAME: "-lc"
-// CHECK-LD-X64-SAME: "-lgcc"
 // CHECK-LD-X64-SAME: "[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4/amd64{{/|\\\\}}crtend.o"
 // CHECK-LD-X64-SAME: "[[SYSROOT]]/usr/lib/amd64{{/|\\\\}}crtn.o"
 
@@ -101,6 +101,15 @@
 // CHECK-SPARC32-SHARED-SAME: "-lc"
 // CHECK-SPARC32-SHARED-NOT: "-lgcc"
 
+/// Check that -static-libgcc is supported.
+// RUN: %clang -### %s --target=sparc-sun-solaris2.11 \
+// RUN:     -static-libgcc \
+// RUN:     --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
+// RUN:   | FileCheck --check-prefixes=CHECK-STATIC-LIBGCC %s
+// CHECK-STATIC-LIBGCC-NOT: warning: argument unused during compilation: '-static-libgcc'
+// CHECK-STATIC-LIBGCC: "-lgcc" "-lgcc_eh"
+// CHECK-STATIC-LIBGCC-NOT: "-lgcc_s"
+
 // Check that libm is only linked with clang++.
 // RUN: %clang -### %s --target=sparc-sun-solaris2.11 \
 // RUN:     --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \