[PATCH] elf: Support lld-style link map for librtld.map

[Adhemerval Zanella]

On 12/03/2020 23:09, Fangrui Song wrote:
> GNU ld and gold's -Map include a line like:
> 
>   path/to/build/libc_pic.a(check_fds.os)
> 
> lld -Map does not have the archive member list, but we can still derive the
> members from the following output
> 
>              VMA              LMA     Size Align Out     In      Symbol
> ...
>            1a1c0            1a1c0       e2    16         path/to/build/libc_pic.a(check_fds.os):(.text)

The new regex will match more entries, but I think it is ok.

LGTM, thanks.

> 
> ---
>  elf/Makefile | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/elf/Makefile b/elf/Makefile
> index da689a2c7b..b035407112 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -512,9 +512,10 @@ $(objpfx)librtld.map: $(objpfx)dl-allobjs.os $(common-objpfx)libc_pic.a
>  	rm -f $@.o
>  	mv -f $@T $@
>  
> +# For lld, skip preceding addresses and values before matching the archive and the member.
>  $(objpfx)librtld.mk: $(objpfx)librtld.map Makefile
>  	LC_ALL=C \
> -	sed -n 's@^$(common-objpfx)\([^(]*\)(\([^)]*\.os\)) *.*$$@\1 \2@p' \
> +	sed -n 's@^[0-9a-f ]*$(common-objpfx)\([^(]*\)(\([^)]*\.os\)) *.*$$@\1 \2@p' \
>  	    $< | \
>  	while read lib file; do \
>  	  case $$lib in \
>