[cfe-dev] clang hangs when compiling simple program

[John Myers]

On Thu, Oct 7, 2010 at 2:45 PM, JP <
jpbonn-keyword-cfedev.957c48 at corniceresearch.com> wrote:

> Clang has recently started hanging when compiling the following program
> from the GCC testsuite.  It had been working fine until a recent change
> (in the past couple days).  I've update from the trunk and done a clean
> rebuild but still have the problem.  Does anyone else have the same issue?
>
> $ clang -cc1 -nostdinc -triple=arm- -emit-llvm-bc /tmp/z.c -o /tmp/z.bc
>
> int
> main (void)
> {
>     long j = 0x40000000;
>     if ((unsigned int) (0x40000000 + j) < 0L)
>         abort ();
>
>     return 0;
> }
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> cfe-dev at cs.uiuc.edu
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>


john at ubuntu:~/src$ /usr/local/src/llvm/Release/bin/clang -cc1 -nostdinc
-triple=arm- -emit-llvm-bc z.c -o z.bc
z.c:6:41: warning: comparison of unsigned expression < 0 is always false
    if ((unsigned int) (0x40000000 + j) < 0L)
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~
z.c:7:9: warning: implicitly declaring C library function 'abort' with type
'void (void)'
        abort ();
        ^
z.c:7:9: note: please include the header <stdlib.h> or explicitly provide a
declaration for 'abort'
2 warnings generated.
john at ubuntu:~/src$ /usr/local/src/llvm/Release/bin/clang --version
clang version 2.9 (trunk 115637)
Target: x86_64-unknown-linux-gnu
Thread model: posix
john at ubuntu:~/src$ cat z.c

int
main (void)
{
    long j = 0x40000000;
    if ((unsigned int) (0x40000000 + j) < 0L)
        abort ();

    return 0;
}
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