Improve help message for -fno-fortran-main

Author: mjklemm

clang/include/clang/Driver/Options.td

@@ -6354,9 +6354,11 @@ def J : JoinedOrSeparate<["-"], "J">,
   Group<gfortran_Group>,
   Alias<module_dir>;
 
+let Visibility = [FlangOption] in {
 def no_fortran_main : Flag<["-"], "fno-fortran-main">,
   Visibility<[FlangOption]>, Group<f_Group>,
-  HelpText<"Don't link in Fortran main">;
+  HelpText<"Do not include Fortran_main.a (provided by Flang) when linking">;
+} // let Visibility = [ FlangOption ]
 
 //===----------------------------------------------------------------------===//
 // FC1 Options

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

@@ -64,7 +64,7 @@
 ! CHECK-NEXT:                         Select Windows run-time library
 ! CHECK-NEXT: -fno-automatic          Implies the SAVE attribute for non-automatic local objects in subprograms unless RECURSIVE
 ! CHECK-NEXT: -fno-color-diagnostics  Disable colors in diagnostics
-! CHECK-NEXT: -fno-fortran-main       Don't link in Fortran main
+! CHECK-NEXT: -fno-fortran-main       Do not include Fortran_main.a (provided by Flang) when linking
 ! CHECK-NEXT: -fno-integrated-as      Disable the integrated assembler
 ! CHECK-NEXT: -fno-lto                Disable LTO mode (default)
 ! CHECK-NEXT: -fno-ppc-native-vector-element-order

flang/test/Driver/driver-help.f90

@@ -54,7 +54,7 @@
 ! HELP-NEXT:                         Select Windows run-time library
 ! HELP-NEXT: -fno-automatic          Implies the SAVE attribute for non-automatic local objects in subprograms unless RECURSIVE
 ! HELP-NEXT: -fno-color-diagnostics  Disable colors in diagnostics
-! HELP-NEXT: -fno-fortran-main       Don't link in Fortran main
+! HELP-NEXT: -fno-fortran-main       Do not include Fortran_main.a (provided by Flang) when linking
 ! HELP-NEXT: -fno-integrated-as      Disable the integrated assembler
 ! HELP-NEXT: -fno-lto                Disable LTO mode (default)
 ! HELP-NEXT: -fno-ppc-native-vector-element-order