[LLVMdev] Error building compiler-rt

[Alexey Samsonov]

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
>>
>>
>
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>
>


-- 
Alexey Samsonov, MSK
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