[Bug driver/57238] New: GCC passes --gdwarf2 to assembler despite -gdwarf-4 on command line

[ppluzhnikov at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57238

            Bug ID: 57238
           Summary: GCC passes --gdwarf2 to assembler despite -gdwarf-4 on
                    command line
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ppluzhnikov at google dot com

I noticed that compiling t.c with '-gdwarf-4', I get:

  <15>   DW_AT_comp_dir    : (indirect string, offset: 0x4e): /tmp

But compiling t.s, I get:

  <24>   DW_AT_comp_dir    : /tmp

Looking at 'as' invocation, t.c build results in:

  as -v --64 -o t.o /tmp/ccSXi0lI.s

while t.s results in:

  as --gdwarf2 -v --64 -o t.o t.s

Given that dwarf-4 is now the default, passing --gdwarf2 to as is the wrong
thing to do, especially given -gdwarf-4 on command line.

This was with trunk GCC built @r198709, native Linux/x86_64 build, configured
with:

  --enable-linker-build-id --disable-lto --with-linker-hash-style=gnu
--enable-languages=c,c++,go