[LLVMdev] Error building compiler-rt

Pranav Garg pranav.garg2107 at gmail.com
Thu Aug 1 08:26:56 PDT 2013 

yes I think that is correct. I wrote a simple program to print if
sizeof(uintptr_t) != sizeof(unsigned char *) and when I compile with gcc
-m64 and execute it on a 64-bit host (that is different from the 32-bit
laptop on which I originally compiled the program), it says the sizes are
not equal.

Thanks
Pranav


On Thu, Aug 1, 2013 at 9:29 AM, Alexey Samsonov <samsonov at google.com> wrote:

>
> 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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