[flang][driver] Mark -Wl as visible in Flang

Differential Revision: https://reviews.llvm.org/D158309

Author: banach-space

clang/include/clang/Driver/Options.td

@@ -912,7 +912,8 @@ def Wdeprecated : Flag<["-"], "Wdeprecated">, Group<W_Group>,
   HelpText<"Enable warnings for deprecated constructs and define __DEPRECATED">;
 def Wno_deprecated : Flag<["-"], "Wno-deprecated">, Group<W_Group>,
   Visibility<[ClangOption, CC1Option]>;
-def Wl_COMMA : CommaJoined<["-"], "Wl,">, Flags<[LinkerInput, RenderAsInput]>,
+def Wl_COMMA : CommaJoined<["-"], "Wl,">, Visibility<[ClangOption, FlangOption]>,
+  Flags<[LinkerInput, RenderAsInput]>,
   HelpText<"Pass the comma separated arguments in <arg> to the linker">,
   MetaVarName<"<arg>">, Group<Link_Group>;
 // FIXME: This is broken; these should not be Joined arguments.

flang/test/Driver/driver-help-hidden.f90

@@ -132,6 +132,7 @@
 ! CHECK-NEXT: -U <macro>              Undefine macro <macro>
 ! CHECK-NEXT: --version               Print version information
 ! CHECK-NEXT: -v                      Show commands to run and use verbose output
+! CHECK-NEXT: -Wl,<arg>               Pass the comma separated arguments in <arg> to the linker
 ! CHECK-NEXT: -W<warning>             Enable the specified warning
 ! CHECK-NEXT: -Xflang <arg>           Pass <arg> to the flang compiler
 ! CHECK-NEXT: -x <language>           Treat subsequent input files as having type <language>

flang/test/Driver/driver-help.f90

@@ -120,6 +120,7 @@
 ! HELP-NEXT: -U <macro>              Undefine macro <macro>
 ! HELP-NEXT: --version               Print version information
 ! HELP-NEXT: -v                      Show commands to run and use verbose output
+! HELP-NEXT: -Wl,<arg>               Pass the comma separated arguments in <arg> to the linker
 ! HELP-NEXT: -W<warning>             Enable the specified warning
 ! HELP-NEXT: -Xflang <arg>           Pass <arg> to the flang compiler
 ! HELP-NEXT: -x <language>           Treat subsequent input files as having type <language>

flang/test/Driver/misc-flags.f90

@@ -1,6 +1,9 @@
 ! Make sure that `-l` is "visible" to Flang's driver
 ! RUN: %flang -lpgmath -### %s
 
+! Make sure that `-Wl` is "visible" to Flang's driver
+! RUN: %flang -Wl,abs -### %s
+
 program hello
   write(*,*), "Hello world!"
 end program hello