[cfe-dev] clang unable to build example C file

[Chris Lattner]

On Oct 10, 2007, at 12:49 PM, Török Edvin wrote:

> Hi,
>
> I tried to compile a simple program with clang, but it failed.
> I am using clang r42834, and llvm r42834.
> I also tried clang r42834 with llvm 2.1 but build failed because of
> some prototype mismatch.
>
> Which version of clang should I usem and what version of llvm does it
> compile with?

This certainly should work, and does for me :).  I bet that if you  
revert clang back to r42817 that it will work for you.

Do you have valgrind available on your machine?  If so, I'd be  
curious to find out if it reports any problems.  The other  
possibility is that it may be a miscompilation by gcc 4.2.1.  Can you  
please run 'make check' in the main llvm/test directory and see if  
you have problems there?

-Chris

> $ cat t.c
> int main() { return 0; }
>
> $ clang t.c
>
> <predefines>:1:2: error: invalid preprocessing directive
> #define __STDC__ 1
>  ^
> <predefines>:2:2: error: invalid preprocessing directive
> #define __STDC_VERSION__ 199901L
>  ^
> <predefines>:3:2: error: invalid preprocessing directive
> #define __STDC_HOSTED__ 1
> ......
> <predefines>:86:2: error: invalid preprocessing directive
> #define __PIC__ 1
>  ^
> 85 diagnostics generated.
>
> Also the preprocessor acts strange (it gives same errors as above)
> $ clang t.c -E 2>/dev/null
> # 1 "t.c" 1
> # 0 "t.c"
> # 1 "<predefines>" 1
>
>
>
> def  iltin_va_list;
> # 1 "t.c" 2
>  () { rn 0; }
>
> Is that text truncation due to the errors above, or signs of  
> miscompilation?
>
> Some more info:
> $ gcc -v
> Using built-in specs.
> Target: x86_64-linux-gnu
> Configured with: ../src/configure -v
> --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
> --enable-shared --with-system-zlib --libexecdir=/usr/lib
> --without-included-gettext --enable-threads=posix --enable-nls
> --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2
> --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr
> --disable-werror --enable-checking=release --build=x86_64-linux-gnu
> --host=x86_64-linux-gnu --target=x86_64-linux-gnu
> Thread model: posix
> gcc version 4.2.1 (Debian 4.2.1-5)
>
> $ /lib/libc.so.6
> GNU C Library stable release version 2.6.1, by Roland McGrath et al.
> Copyright (C) 2007 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.
> There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
> PARTICULAR PURPOSE.
> Compiled by GNU CC version 4.2.1 (Debian 4.2.1-5).
> Compiled on a Linux >>2.6.17-2-vserver-amd64<< system on 2007-09-17.
> Available extensions:
>         crypt add-on version 2.1 by Michael Glad and others
>         GNU Libidn by Simon Josefsson
>         Native POSIX Threads Library by Ulrich Drepper et al
>         BIND-8.2.3-T5B
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/libc/bugs.html>.
>
> $ ld -v
> GNU ld (GNU Binutils for Debian) 2.18
>
> Thanks,
> Edwin
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