[LLVMbugs] [Bug 3386] New: clang rejects a sensible application of __alignof__

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Jan 24 03:22:27 PST 2009


           Summary: clang rejects a sensible application of __alignof__
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Semantic Analyzer
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: bagnara at cs.unipr.it
                CC: llvmbugs at cs.uiuc.edu, bolzoni at cs.unipr.it

This comes from linux-

$ cat /tmp/bug28.c 
struct crypto_tfm {
        int crt_flags;
        void *__crt_ctx[];

inline unsigned int crypto_tfm_ctx_alignment(void)
        struct crypto_tfm *tfm;
        return __alignof__(tfm->__crt_ctx);
$ gcc -c -W -Wall /tmp/bug28.c 
$ icc -c -Wall /tmp/bug28.c 
/tmp/bug28.c(9): warning #1549: alignment-of operator applied to incomplete
          return __alignof__(tfm->__crt_ctx);

$ clang /tmp/bug28.c
/tmp/bug28.c:9:16: error: invalid application of '__alignof' to an incomplete
type 'void *[]'
        return __alignof__(tfm->__crt_ctx);
               ^          ~~~~~~~~~~~~~~~~
1 diagnostic generated.

(I miss the point of the warning given by the Intel C compiler, by the way.)

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