[LLVMdev] Error building compiler-rt

[Matt Arsenault]

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.
> ...
> 
> 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
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