[clang] [Driver] Add linker options to support statical linking to shared flang-rt on AIX. (PR #131822)

[Hubert Tong via cfe-commits]

================
@@ -127,9 +127,19 @@ void aix::Linker::ConstructJob(Compilation &C, const 
JobAction &JA,
   }
 
   // Force static linking when "-static" is present.
-  if (Args.hasArg(options::OPT_static))
+  if (Args.hasArg(options::OPT_static)) {
     CmdArgs.push_back("-bnso");
 
+    if (D.IsFlangMode()) {
+      // The folllowing linker options are needed to statically link to the
+      // shared libflang_rt.runtime.a on AIX
+      CmdArgs.push_back("-bI:/usr/lib/syscalls.exp");
+      CmdArgs.push_back("-bI:/usr/lib/aio.exp");
+      CmdArgs.push_back("-bI:/usr/lib/threads.exp");
+      CmdArgs.push_back("-lcrypt");
+    }
----------------
hubert-reinterpretcast wrote:

Does this add extra options even when `libflang_rt.runtime.a` is not being 
linked in?
See 
https://github.com/llvm/llvm-project/blob/main/clang/lib/Driver/ToolChains/AIX.cpp#L359-L365


https://github.com/llvm/llvm-project/pull/131822
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