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From: Paul Menzel <pmenzel@molgen.mpg.de>
Subject: LLVM/clang ias build fails with unsupported arguments '-mpower4' and
 '-many' to option 'Wa,'
To: Michael Ellerman <mpe@ellerman.id.au>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Paul Mackerras <paulus@samba.org>
Message-ID: <62cc7e62-d072-7b16-8b6c-006f067b1ed7@molgen.mpg.de>
Date: Mon, 13 Sep 2021 11:48:21 +0200
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Cc: Derek Parker <parkerderek86@gmail.com>, llvm@lists.linux.dev,
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Dear Linux folks,


Building Linux with LLVM’s integrated assembler fails with the error 
below [1].

```
$ ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- make LLVM=1 
LLVM_IAS=1 -j72 pseries_defconfig arch/powerpc/kernel/vdso32/gettimeofday.o
...
arch/powerpc/kernel/vdso32/gettimeofday.S:72:8: error: unsupported 
directive '.stabs'
.stabs "_restgpr_31_x:F-1",36,0,0,_restgpr_31_x; .globl _restgpr_31_x; 
_restgpr_31_x:
        ^
arch/powerpc/kernel/vdso32/gettimeofday.S:73:8: error: unsupported 
directive '.stabs'
.stabs "_rest32gpr_31_x:F-1",36,0,0,_rest32gpr_31_x; .globl 
_rest32gpr_31_x; _rest32gpr_31_x:
        ^
```

The LLVM developers are not planning on implementing this, as Stab has 
been succeeded by DWARF [2].


Kind regards,

Paul


[1]: https://github.com/ClangBuiltLinux/linux/issues/1418
[2]: https://bugs.llvm.org/show_bug.cgi?id=31134

From mboxrd@z Thu Jan  1 00:00:00 1970
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	Mon, 13 Sep 2021 11:48:21 +0200 (CEST)
From: Paul Menzel <pmenzel@molgen.mpg.de>
Subject: LLVM/clang ias build fails with unsupported arguments '-mpower4' and
 '-many' to option 'Wa,'
To: Michael Ellerman <mpe@ellerman.id.au>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org, Derek Parker <parkerderek86@gmail.com>,
 Dmitrii Okunev <xaionaro@gmail.com>, Nathan Chancellor <nathan@kernel.org>,
 Nick Desaulniers <ndesaulniers@google.com>, llvm@lists.linux.dev
Message-ID: <62cc7e62-d072-7b16-8b6c-006f067b1ed7@molgen.mpg.de>
Date: Mon, 13 Sep 2021 11:48:21 +0200
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Dear Linux folks,


Building Linux with LLVM’s integrated assembler fails with the error 
below [1].

```
$ ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- make LLVM=1 
LLVM_IAS=1 -j72 pseries_defconfig arch/powerpc/kernel/vdso32/gettimeofday.o
...
arch/powerpc/kernel/vdso32/gettimeofday.S:72:8: error: unsupported 
directive '.stabs'
.stabs "_restgpr_31_x:F-1",36,0,0,_restgpr_31_x; .globl _restgpr_31_x; 
_restgpr_31_x:
        ^
arch/powerpc/kernel/vdso32/gettimeofday.S:73:8: error: unsupported 
directive '.stabs'
.stabs "_rest32gpr_31_x:F-1",36,0,0,_rest32gpr_31_x; .globl 
_rest32gpr_31_x; _rest32gpr_31_x:
        ^
```

The LLVM developers are not planning on implementing this, as Stab has 
been succeeded by DWARF [2].


Kind regards,

Paul


[1]: https://github.com/ClangBuiltLinux/linux/issues/1418
[2]: https://bugs.llvm.org/show_bug.cgi?id=31134