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Re: [testsuite, i386] Require -static support in gcc.dg/pie-static-[12].c (PR testsuite/81793)


Hi Mike,

> On Aug 12, 2017, at 9:03 AM, Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> wrote:
>> 
>> The new gcc.dg/pie-static-[12].c testcases FAIL on several systems:
>> 
>> * Solaris 11.4 has PIE support, but lacks static libc, libm
>> 
>> * Linux without the static libc, libm installed
>> 
>> The following patch fixes this by requiring both PIE and -static
>> support.
>> 
>> Tested with the appropriate runtest invocations on i386-pc-solaris2.11
>> and x86_64-pc-linux-gnu (where the tests come up as UNSUPPORTED; I don't
>> have a Linux system with static libc/libm installed), installed on
>> mainline.
>> 
>> The tests also FAIL on Darwin/x86_64, but the failure mode is different:
>> for -static, the executable is linked with -lcrt0.o (done this way to
>> locate crt0.o in the linker's search path, cf. config/darwin.h
>> (STARTFILE_SPEC)), but neither on Darwin 11 nor on Darwin 17 could I
>> find where crt0.o would come from, so I've left this part alone.
>
> darwin isn't exactly like other systems.  There is no crt0.o and static is
> more special than you can imagine.  There was once 1 program that did a
> static link, but one was exceptionally special.
>
> Indeed, one way to implement it would be as a request option, and then
> ignore the parts that don't make sense for the platform.  In that case,
> -static-libgcc and friends might be the end semantics.

All this begs the question why on earth would darwin.h (STARTFILE_SPEC)
accept -static and try to link libcrt0.o it the latter doesn't exist.

However, I've just found that the bundled clang on Darwin 11 does the
same (and fails in the same way: "ld: library not found for -lcrt0.o").

	Rainer

-- 
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University


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