[flang][Driver] When linking with the Fortran runtime, the addArchSpecificRPath() should be called too

When linking with other runtimes (OpenMP, sanitizers),
the addArchSpecificRPath() is being called. The same thing should
happen when linking with the Fortran runtime, this will improve
user experience massively.

Author: pawosm-arm

clang/lib/Driver/ToolChains/CommonArgs.cpp

@@ -1293,6 +1293,7 @@ void tools::addFortranRuntimeLibs(const ToolChain &TC, const ArgList &Args,
     }
     CmdArgs.push_back("-lFortranRuntime");
     CmdArgs.push_back("-lFortranDecimal");
+    addArchSpecificRPath(TC, Args, CmdArgs);
   }
 
   // libomp needs libatomic for atomic operations if using libgcc

flang/test/Driver/arch-specific-libdir-rpath.f95

@@ -16,6 +16,13 @@
 !
 ! Test that -rpath is added
 !
+! Add LIBPATH, RPATH
+!
+! RUN: %flang %s -### --target=x86_64-linux \
+! RUN:     -resource-dir=%S/../../../clang/test/Driver/Inputs/resource_dir_with_arch_subdir \
+! RUN:     -frtlib-add-rpath 2>&1 \
+! RUN:   | FileCheck --check-prefixes=RESDIR,LIBPATH-X86_64,RPATH-X86_64 %s
+!
 ! Add LIBPATH, RPATH for OpenMP
 !
 ! RUN: %flang %s -### --target=x86_64-linux -fopenmp \