[LLVMdev] Error building compiler-rt

Alexey Samsonov samsonov at google.com
Thu Aug 1 07:29:40 PDT 2013 

On Thu, Aug 1, 2013 at 5:32 PM, Pranav Garg <pranav.garg2107 at gmail.com>wrote:

> Dear Alexey,
>
> Yes I am sure that the llvm, clang and compiler-rt are synced to the same
> version. I downloaded them all from git
> http://llvm.org/docs/GettingStarted.html#git-mirror
> I think I need compiler-rt for my project but I'll verify it again to see
> if I can proceed without it.
> You are correct that compiler-rt is compiled with the just built clang.
> The complete command that gives an error while compiler-rt compilation is:
>
> /home/pranav/smack-project/llvm/build/Release+Asserts/bin/clang -fPIC
> -Wall -Werror -O3 -fomit-frame-pointer -m64
> --sysroot=/home/pranav/smack-project/llvm/src/projects/compiler-rt/SDKs/linux
> -c -o
> /home/pranav/smack-project/llvm/build/tools/clang/runtime/compiler-rt/clang_linux/full-x86_64/x86_64/SubDir.lib/enable_execute_stack.o
> /home/pranav/smack-project/llvm/src/projects/compiler-rt/lib/enable_execute_stack.c
>
> /home/pranav/smack-project/llvm/src/projects/compiler-rt/lib/enable_execute_stack.c:53:29:
> error: cast to 'unsigned char *' from smaller integer type 'unsigned int'
>       [-Werror,-Wint-to-pointer-cast]
>         unsigned char* startPage = (unsigned char*)(p & pageAlignMask);
>

Hm... Is it true that somewhy on your system (32-bit host, I presume),
sizeof(uintptr_t) != sizeof(unsigned char *) when you build code in 64-bit
mode (with -m64)?


>
>
> Thanks
> Pranav
>
>
> On Thu, Aug 1, 2013 at 7:27 AM, Alexey Samsonov <samsonov at google.com>wrote:
>
>> Hi Pranav,
>>
>> On Thu, Aug 1, 2013 at 1:54 AM, Pranav Garg <pranav.garg2107 at gmail.com>wrote:
>>
>>> Hi,
>>>
>>> I see that ENABLE_WERROR is being set to off (the default value) in the
>>> config.log in the llvm build. However on grepping for WERROR in the
>>> compiler-rt folder I get the following output:
>>>
>>> pranav at pranav:~/smack-project/llvm-3.4/src/projects/compiler-rt$ grep
>>> -Rin WERROR *
>>> lib/asan/tests/CMakeLists.txt:38:  -Werror
>>> lib/asan/asan_malloc_mac.cc:253:// This function is currently unused,
>>> and we build with -Werror.
>>> lib/tsan/check_cmake.sh:8:CC=clang CXX=clang++ cmake
>>> -DLLVM_ENABLE_WERROR=ON -DCMAKE_BUILD_TYPE=Release
>>> -DLLVM_ENABLE_ASSERTIONS=ON $ROOT/../../../..
>>> lib/tsan/Makefile.old:3:CXXFLAGS = -fPIE -fno-rtti -g -Wall -Werror \
>>> lib/tsan/rtl/Makefile.old:1:CXXFLAGS = -fPIE -g -Wall -Werror
>>> -fno-builtin -DTSAN_DEBUG=$(DEBUG) -DSANITIZER_DEBUG=$(DEBUG)
>>> lib/tsan/go/buildgo.sh:68:FLAGS=" -I../rtl -I../..
>>> -I../../sanitizer_common -I../../../include -m64 -Wall -Werror
>>> -Wno-maybe-uninitialized -fno-exceptions -fno-rtti -DTSAN_GO -DSANITIZER_GO
>>> -DTSAN_SHADOW_COUNT=4 $OSCFLAGS"
>>> lib/sanitizer_common/sanitizer_platform_limits_posix.cc:410:  unsigned
>>> IOCTL_FDWERRORCLR = FDWERRORCLR;
>>> lib/sanitizer_common/sanitizer_platform_limits_posix.cc:411:  unsigned
>>> IOCTL_FDWERRORGET = FDWERRORGET;
>>> lib/sanitizer_common/sanitizer_platform_limits_posix.h:442:  extern
>>> unsigned IOCTL_FDWERRORCLR;
>>> lib/sanitizer_common/sanitizer_platform_limits_posix.h:443:  extern
>>> unsigned IOCTL_FDWERRORGET;
>>> lib/sanitizer_common/tests/CMakeLists.txt:36:  -Wall -Werror
>>> -Werror=sign-compare)
>>> lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc:177:
>>> _(FDWERRORCLR, NONE, 0);
>>> lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc:178:
>>> _(FDWERRORGET, WRITE, struct_floppy_write_errors_sz);
>>> make/options.mk:10:CFLAGS := -Wall -Werror
>>> make/platform/clang_linux.mk:85:CFLAGS := -Wall -Werror -O3
>>> -fomit-frame-pointer
>>> make/platform/clang_darwin.mk:109:CFLAGS := -Wall -Werror -O3
>>> -fomit-frame-pointer
>>> make/platform/multi_arch.mk:10:CFLAGS := -Wall -Werror
>>> make/platform/darwin_fat.mk:42:CFLAGS := -Wall -Werror
>>>
>>> I see that -DLLVM_ENABLE_WERROR is being set in the script
>>> "lib/tsan/check_cmake.sh". Should I disable -DLLVM_ENABLE_WERROR at this
>>> point?
>>>
>>> Thanks
>>> Pranav
>>>
>>>
>>> On Wed, Jul 31, 2013 at 3:24 PM, Matt Arsenault <arsenm2 at gmail.com>wrote:
>>>
>>>> You can disable -Werror by adding the cmake flag
>>>> -DLLVM_ENABLE_WERROR=OFF, which should let it just ignore that (that's also
>>>> the default, so you must have turned it on somewhere)
>>>>
>>>> On Jul 31, 2013, at 13:09 , Pranav Garg <pranav.garg2107 at gmail.com>
>>>> wrote:
>>>>
>>>> > Hi,
>>>> >
>>>> > I am trying to build llvm along with clang and compiler-rt. When I
>>>> run make, I am getting the following compilation error (I tried compiling
>>>> llvm-3.2, which is what I need for my project, but also tried llvm-3.3 and
>>>> the current llvm source from the git repository).
>>>> >
>>>> > ...
>>>> >   COMPILE:   clang_linux/full-x86_64/x86_64:
>>>> /home/pranav/smack-project/llvm/src/projects/compiler-rt/lib/enable_execute_stack.c
>>>> >
>>>> /home/pranav/smack-project/llvm/src/projects/compiler-rt/lib/enable_execute_stack.c:53:29:
>>>> error: cast to 'unsigned char *' from smaller integer type 'unsigned int'
>>>> >       [-Werror,-Wint-to-pointer-cast]
>>>> >         unsigned char* startPage = (unsigned char*)(p &
>>>> pageAlignMask);
>>>> >                                    ^
>>>> >
>>>> /home/pranav/smack-project/llvm/src/projects/compiler-rt/lib/enable_execute_stack.c:54:27:
>>>> error: cast to 'unsigned char *' from smaller integer type 'unsigned int'
>>>> >       [-Werror,-Wint-to-pointer-cast]
>>>> >         unsigned char* endPage = (unsigned
>>>> char*)((p+TRAMPOLINE_SIZE+pageSize) & pageAlignMask);
>>>> >                                  ^
>>>> > 2 errors generated.
>>>>
>>>
>> This is weird. In configure+make build all sources from
>> projects/compiler-rt are compiled with just-built Clang, so -Werror should
>> work fine for you,
>> no matter which host compiler you have. Are you sure llvm, clang and
>> compiler-rt checkouts are synced to the same revision?
>> As a workaround, you may try to remove compiler-rt checkout if you don't
>> need it for now.
>>
>>
>>
>>>  > ...
>>>> >
>>>> > On gcc --version I get the following output:
>>>> >         gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
>>>> > My operating system is a Ubuntu 12.04.1 LTS. On typing uname -a I get:
>>>> >         Linux pranav 3.2.0-33-generic-pae #52-Ubuntu SMP Thu Oct 18
>>>> 16:39:21 UTC 2012 i686 i686 i386 GNU/Linux
>>>> >
>>>> > Any ideas as to how to resolve this compilation error?
>>>> >
>>>> > Thanks
>>>> > Pranav
>>>> > _______________________________________________
>>>> > LLVM Developers mailing list
>>>> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>
>>>>
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>>>
>>
>>
>> --
>> Alexey Samsonov, MSK
>>
>
>


-- 
Alexey Samsonov, MSK
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