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Date: Mon, 27 Apr 2020 14:24:24 +0200
From: Harald Hoyer <harald@...hat.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] Enable linking to a static position independent
executable
Am 24.04.20 um 17:08 schrieb Rich Felker:
> On Tue, Apr 07, 2020 at 03:17:07PM +0200, harald@...hat.com wrote:
>> diff --git a/tools/musl-gcc.specs.sh b/tools/musl-gcc.specs.sh
>> old mode 100644
>> new mode 100755
>> index 30492574..4d93626a
>> --- a/tools/musl-gcc.specs.sh
>> +++ b/tools/musl-gcc.specs.sh
>> @@ -17,13 +17,13 @@ cat <<EOF
>> libgcc.a%s %:if-exists(libgcc_eh.a%s)
>>
>> *startfile:
>> -%{!shared: $libdir/Scrt1.o} $libdir/crti.o crtbeginS.o%s
>> +%{shared:;static:$libdir/crt1.o%s; static-pie:$libdir/rcrt1.o%s; pie:$libdir/Scrt1.o%s; :$libdir/crt1.o%s} $libdir/crti.o%s %{static:crtbeginT.o%s; shared|static-pie|pie:crtbeginS.o%s; :crtbegin.o%s}
>>
>> *endfile:
>> -crtendS.o%s $libdir/crtn.o
>> +%{static:crtend.o%s; shared|static-pie|pie:crtendS.o%s; :crtend.o%s} $libdir/crtn.o%s
>
> Is there a reason for this change? I think crtendS.o is always
> preferable and the other ones just exist for weird historical reasons.
I just didn't want to divert too much from the original gcc spec.
>
>> *link:
>> --dynamic-linker $ldso -nostdlib %{shared:-shared} %{static:-static} %{rdynamic:-export-dynamic}
>> +%{!r:--build-id} --no-add-needed %{!static|static-pie:--eh-frame-hdr} --hash-style=gnu %{shared:-shared} %{!shared:%{!static:%{!static-pie:%{rdynamic:-export-dynamic} -dynamic-linker $ldso}} %{static:-static} %{static-pie:-static -pie --no-dynamic-linker -z text}}
>
Same as above. I just didn't want to divert too much from the original gcc spec. But you are right. Small steps.
> There are multiple unrelated and probably unwanted changes here:
>
> * --build-id> * --eh-frame-header but only for non-static?
> * --hash-style=gnu?
> * Disallowing -rdynamic for static[-pie]?
> * ... ?
>
> I think all that should be done here is ensuring that
> --no-dynamic-linker is passed whenever -static-pie is. Is there
> something else that's a wanted change that I'm overlooking?
>
> Rich
>
Will update with a minimal diff.
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