[LLVMdev] Error building compiler-rt

Pranav Garg pranav.garg2107 at gmail.com
Thu Aug 1 06:32:21 PDT 2013 

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);


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
>
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