[llvm-dev] Compilation issue "unsupported relocation on symbol" with clang 3.7.1
via llvm-dev
llvm-dev at lists.llvm.org
Tue Nov 28 00:04:52 PST 2017
Hi again,
So I applied the patch but I have still the same issue.
---
-- Build files have been written to: /tmp/aki/llvm-5.0.0.src/build
[1465/5024] Creating library symlink lib/libc++.so.1 lib/libc++.so
GENERATING SCRIPT: 'INPUT(libc++.so.1 -lc++abi)' as file /tmp/aki/llvm-5.0.0.src/build/lib/libc++.so
[1588/5024] Building C object projects/compiler-rt/lib...ins/CMakeFiles/clang_rt.builtins-arm.dir/cpu_model.c.o
../projects/compiler-rt/lib/builtins/cpu_model.c:596:7: warning: ISO C requires a translation unit to contain at least one declaration [-Wempty-translation-unit]
#endif
^
1 warning generated.
[1786/5024] Building C object projects/compiler-rt/lib.../CMakeFiles/clang_rt.builtins-armv6m.dir/cpu_model.c.o
../projects/compiler-rt/lib/builtins/cpu_model.c:596:7: warning: ISO C requires a translation unit to contain at least one declaration [-Wempty-translation-unit]
#endif
^
1 warning generated.
[1915/5024] Building ASM object projects/compiler-rt/l...iles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o
FAILED: projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o
/usr/bin/clang -DLLVM_BUILD_GLOBAL_ISEL -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/builtins -I../projects/compiler-rt/lib/builtins -Iinclude -I../include -fPIC -O3 -DNDEBUG -march=armv6m -mfloat-abi=soft -fno-lto -MD -MT projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o -MF projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o.d -o projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o -c ../projects/compiler-rt/lib/builtins/arm/aeabi_memcmp.S
clang -cc1as: fatal error: error in backend: unsupported relocation on symbol
[1917/5024] Building ASM object projects/compiler-rt/l...iles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o
FAILED: projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o
/usr/bin/clang -DLLVM_BUILD_GLOBAL_ISEL -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/builtins -I../projects/compiler-rt/lib/builtins -Iinclude -I../include -fPIC -O3 -DNDEBUG -march=armv6m -mfloat-abi=soft -fno-lto -MD -MT projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o -MF projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o.d -o projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o -c ../projects/compiler-rt/lib/builtins/arm/aeabi_memcpy.S
clang -cc1as: fatal error: error in backend: unsupported relocation on symbol
[1918/5024] Building ASM object projects/compiler-rt/l...les/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o
FAILED: projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o
/usr/bin/clang -DLLVM_BUILD_GLOBAL_ISEL -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/builtins -I../projects/compiler-rt/lib/builtins -Iinclude -I../include -fPIC -O3 -DNDEBUG -march=armv6m -mfloat-abi=soft -fno-lto -MD -MT projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o -MF projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o.d -o projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o -c ../projects/compiler-rt/lib/builtins/arm/aeabi_memmove.S
clang -cc1as: fatal error: error in backend: unsupported relocation on symbol
[1920/5024] Building CXX object lib/Target/ARM/MCTargetDesc/CMakeFiles/LLVMARMDesc.dir/ARMMCTargetDesc.cpp.o
ninja: build stopped: subcommand failed
---
So if we check the content of the following file :
projects/compiler-rt/lib/builtins/arm/aeabi_memcmp.S
---
//===-- aeabi_memcmp.S - EABI memcmp implementation -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
// void __aeabi_memcmp(void *dest, void *src, size_t n) { memcmp(dest, src, n); }
.syntax unified
.p2align 2
DEFINE_COMPILERRT_FUNCTION(__aeabi_memcmp)
#ifdef USE_THUMB_1
push {r7, lr}
bl memcmp
pop {r7, pc}
#else
b memcmp
#endif
END_COMPILERRT_FUNCTION(__aeabi_memcmp)
DEFINE_AEABI_FUNCTION_ALIAS(__aeabi_memcmp4, __aeabi_memcmp)
DEFINE_AEABI_FUNCTION_ALIAS(__aeabi_memcmp8, __aeabi_memcmp)
NO_EXEC_STACK_DIRECTIVE
---
The file has been correctly patch but do I need to provide a switch to the pre-processor
for USE_THUMB_1 like "-DUSE_THUMB_1" ?
Cheers
November 27, 2017 3:36 PM, "via llvm-dev" <llvm-dev at lists.llvm.org> wrote:
> Thank you Peter, I will try to patch instead.
>
> Cheers
>
> November 27, 2017 3:12 PM, "Peter Smith" <peter.smith at linaro.org> wrote:
>
>> A very recent change to compiler-rt https://reviews.llvm.org/D39700
>> recently the unconditional branch for v6-m in some of the aeabi_
>> functions, if you are able to use compiler-rt from trunk or alter the
>> compiler-rt source yourself you may be able to work around the problem
>> without changing versions of llvm.
>>
>> I'm not sure what to recommend otherwise, you may be able to turn off
>> the integrated assembler and use arm-non-eabi-as for the files with
>> unconditional branches, but I couldn't guarantee that would wouldn't
>> result in other problems.
>>
>> Peter
>>
>> On 27 November 2017 at 11:02, <shiftag at nanotek.info> wrote:
>
> November 27, 2017 2:43 PM, "Peter Smith" <peter.smith at linaro.org> wrote:
>> My best guess is that this is PR30279
>> https://bugs.llvm.org/show_bug.cgi?id=30279 which was fixed in r280651
>> in September 2016. Can you try again with a version of clang/llvm from
>> after that point? Some versions of aeabi_memcpy.S contain an
>> unconditional branch to memcpy (a branch out of section that can't be
>> resolved at assembly time). The v6m unconditional branch has a very
>> short range and earlier versions of llvm did not support the
>> relocation.
>>
>> Hope this helps
>
> Hi Peter,
>
> Thank you for your answer. I saw that pages before but I didn't find any
> information about how to fix this. And unfortunately, I can't use a different
> version of clang/llvm.
>
> Thanks
>> On 26 November 2017 at 12:09, via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
> Hi List,
>
> I'm trying to build llvm-5.0.0 with clang-3.7.1 on ARM (native building). At
> some point I have the following issue :
>
> ----
>
> [1588/5024] Building C object
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-arm.dir/cpu_model.c.o
> ../projects/compiler-rt/lib/builtins/cpu_model.c:596:7: warning: ISO C
> requires a translation unit to contain at least one declaration
> [-Wempty-translation-unit]
> #endif
> ^
> 1 warning generated.
> [1786/5024] Building C object
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/cpu_model.c.o
> ../projects/compiler-rt/lib/builtins/cpu_model.c:596:7: warning: ISO C
> requires a translation unit to contain at least one declaration
> [-Wempty-translation-unit]
> #endif
> ^
> 1 warning generated.
> [1915/5024] Building ASM object
> projects/compiler-rt/lib/built...s/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o
> FAILED:
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o
> /usr/bin/clang -DLLVM_BUILD_GLOBAL_ISEL -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
> -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
> -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/builtins
> -I../projects/compiler-rt/lib/builtins -Iinclude -I../include -fPIC -O3
> -DNDEBUG -march=armv6m -mfloat-abi=soft -fno-lto -MD -MT
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o
> -MF
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o.d
> -o
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcmp.S.o
> -c ../projects/compiler-rt/lib/builtins/arm/aeabi_memcmp.S
> clang -cc1as: fatal error: error in backend: unsupported relocation on
> symbol
> [1917/5024] Building ASM object
> projects/compiler-rt/lib/built.../CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o
> FAILED:
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o
> /usr/bin/clang -DLLVM_BUILD_GLOBAL_ISEL -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
> -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
> -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/builtins
> -I../projects/compiler-rt/lib/builtins -Iinclude -I../include -fPIC -O3
> -DNDEBUG -march=armv6m -mfloat-abi=soft -fno-lto -MD -MT
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o
> -MF
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memmove.S.o.d
> -o
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins----armv6m.dir/arm/aeabi_memmove.S.o
> -c ../projects/compiler-rt/lib/builtins/arm/aeabi_memmove.S
> clang -cc1as: fatal error: error in backend: unsupported relocation on
> symbol
> [1918/5024] Building ASM object
> projects/compiler-rt/lib/built...s/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o
> FAILED:
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o
> /usr/bin/clang -DLLVM_BUILD_GLOBAL_ISEL -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
> -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
> -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/builtins
> -I../projects/compiler-rt/lib/builtins -Iinclude -I../include -fPIC -O3
> -DNDEBUG -march=armv6m -mfloat-abi=soft -fno-lto -MD -MT
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o
> -MF
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o.d
> -o
> projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-armv6m.dir/arm/aeabi_memcpy.S.o
> -c ../projects/compiler-rt/lib/builtins/arm/aeabi_memcpy.S
> clang -cc1as: fatal error: error in backend: unsupported relocation on
> symbol
> [1920/5024] Building CXX object
> lib/Target/ARM/MCTargetDesc/CMakeFiles/LLVMARMDesc.dir/ARMMCTargetDesc.cpp.o
> ninja: build stopped: subcommand failed.
>
> ----
>
> Relevant stuff:
> clang -cc1as: fatal error: error in backend: unsupported relocation on
> symbol
>
> Well, I don't know how to fix that. Any ideas ?
>
> Let me know if you need further info.
>
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