[PATCH v2 3/3] Keep .GCC.command.line sections of LTO objetcs.

[Richard Biener]

On Tue, Mar 3, 2020 at 5:41 PM Egeyar Bagcioglu
<egeyar.bagcioglu@oracle.com> wrote:
>
> This patch is for .GCC.command.line sections in LTO objects to be copied
> into the final objects as in the following example:
>
> [egeyar@localhost lto]$ gcc -flto -O3 demo.c -c -g --record-gcc-command-line
> [egeyar@localhost lto]$ gcc -flto -O2 demo2.c -c -g --record-gcc-command-line -DFORTIFY=2
> [egeyar@localhost lto]$ gcc demo.o demo2.o -o a.out
> [egeyar@localhost lto]$ readelf -p .GCC.command.line a.out
>
> String dump of section '.GCC.command.line':
>   [     0]  10.0.1 20200227 (experimental) : gcc -flto -O3 demo.c -c -g --record-gcc-command-line
>   [    56]  10.0.1 20200227 (experimental) : gcc -flto -O2 demo2.c -c -g --record-gcc-command-line -DFORTIFY=2

--record-gcc-command-line is not a FSF GCC option, there's
-frecord-gcc-switches though which
(also) populates .GCC.command.line

OK.

Thanks,
Richard.

> Regards
> Egeyar
>
> libiberty:
> 2020-02-27  Egeyar Bagcioglu  <egeyar.bagcioglu@oracle.com>
>
>         * simple-object.c (handle_lto_debug_sections): Name
>         ".GCC.command.line" among debug sections to be copied over
>         from lto objects.
> ---
>  libiberty/simple-object.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/libiberty/simple-object.c b/libiberty/simple-object.c
> index d9c648a..3b3ca9c 100644
> --- a/libiberty/simple-object.c
> +++ b/libiberty/simple-object.c
> @@ -298,6 +298,9 @@ handle_lto_debug_sections (const char *name, int rename)
>       COMDAT sections in objects produced by GCC.  */
>    else if (strcmp (name, ".comment") == 0)
>      return strcpy (newname, name);
> +  /* Copy over .GCC.command.line section under the same name if present.  */
> +  else if (strcmp (name, ".GCC.command.line") == 0)
> +    return strcpy (newname, name);
>    free (newname);
>    return NULL;
>  }
> --
> 1.8.3.1
>