linux-kernel - Re: hppa vDSO and compiler (non-)support

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Date:   Tue, 22 Mar 2022 10:50:50 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Helge Deller <deller@....de>
Cc:     Jiri Slaby <jirislaby@...nel.org>, linux-parisc@...r.kernel.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        Martin Liška <mliska@...e.cz>,
        Andreas Schwab <schwab@...ux-m68k.org>
Subject: Re: hppa vDSO and compiler (non-)support

On 3/22/22 09:16, Helge Deller wrote:
> On 3/22/22 16:19, Guenter Roeck wrote:
>> On 3/22/22 07:25, Helge Deller wrote:
>>> On 3/22/22 14:05, Guenter Roeck wrote:
>>>> Does that also fix the build problems now seen in mainline ?
>>>
>>> No.
>>>
>>>> Building parisc64:generic-64bit_defconfig ... failed
>>>> --------------
>>>> Error log:
>>>> arch/parisc/kernel/vdso64/Makefile:30: FORCE prerequisite is missing
>>>> arch/parisc/kernel/vdso32/sigtramp.S: Assembler messages:
>>>> arch/parisc/kernel/vdso32/sigtramp.S:39: Error: unknown pseudo-op: `.proc'
>>>> ...
>>>> arch/parisc/kernel/vdso32/restart_syscall.S:32: Error: .cfi_endproc without corresponding .cfi_startproc
>>>> make[2]: *** [arch/parisc/kernel/vdso32/Makefile:34: arch/parisc/kernel/vdso32/restart_syscall.o] Error 1
>>>> make[2]: *** Waiting for unfinished jobs....
>>>> make[2]: *** [arch/parisc/kernel/vdso32/Makefile:34: arch/parisc/kernel/vdso32/sigtramp.o] Error 1
>>>> make[1]: *** [arch/parisc/Makefile:177: vdso_prepare] Error 2
>>>> make: *** [Makefile:219: __sub-make] Error 2
>>>>
>>>> This is with hppa64-linux-gcc (GCC) 11.2.0.
>>>
>>> Can you check if you have the 32-bit compiler (hppa-linux-gcc) installed too?
>>> The errors above happen when building the 32-bit vDSO, for which you need the 32-bit compiler.
>>>
>>
>> Yes, I do, but that doesn't help much if I want to build a 64-bit target such
>> as generic-64bit_defconfig. Am I missing something ?
> 
> The 64-bit PA-RISC kernel now includes a built-in a 32-bit and a 64-bit vDSO for userspace.
> To build the 32-bit vDSO (vdso32) you need the 32-bit hppa compiler installed.
> That's what's being done above - see the path: arch/parisc/kernel/vdso32/
> Can you try "make V=1" to see the command line?
> 


I am currently bisecting another problem. I'll try that afterwards.
Either case, how does one specify two cross compilers with two different
prefixes on the command line ?

Guenter