[Driver] Have -rdynamic be a no-op on Haiku (#67872)

Do the same as the Haiku GCC patches.

haikuports/haikuports@46afdec

Author: brad0

clang/lib/Driver/ToolChains/Haiku.cpp

@@ -42,15 +42,16 @@ void haiku::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   // Silence warning for "clang -pie foo.o -o foo"
   Args.ClaimAllArgs(options::OPT_pie);
 
+  // -rdynamic is a no-op with Haiku. Claim argument to avoid warning.
+  Args.ClaimAllArgs(options::OPT_rdynamic);
+
   if (!D.SysRoot.empty())
     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
 
   CmdArgs.push_back("--eh-frame-hdr");
   if (Static) {
     CmdArgs.push_back("-Bstatic");
   } else {
-    if (Args.hasArg(options::OPT_rdynamic))
-      CmdArgs.push_back("-export-dynamic");
     if (Shared)
       CmdArgs.push_back("-shared");
     CmdArgs.push_back("--enable-new-dtags");

clang/test/Driver/haiku.c

@@ -56,6 +56,11 @@
 // CHECK-LD-X86_64-SAME: {{^}} "[[SYSROOT]]/boot/system/develop/tools/lib/gcc/x86_64-unknown-haiku/13.2.0/crtendS.o"
 // CHECK-LD-X86_64-SAME: {{^}} "[[SYSROOT]]/boot/system/develop/lib/crtn.o"
 
+// Check -rdynamic is a no-op
+// RUN: %clang -### -rdynamic %s 2>&1 --target=x86_64-unknown-haiku \
+// RUN:    | FileCheck --check-prefix=CHECK-RDYNAMIC %s
+// CHECK-RDYNAMIC-NOT: "-export-dynamic"
+
 // Check the right flags are present with -shared
 // RUN: %clang -### %s -shared 2>&1 --target=x86_64-unknown-haiku \
 // RUN:     --gcc-toolchain="" \