[LLVMbugs] [Bug 18711] New: -Wcast-align doesn't special case char*

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Feb 3 10:23:37 PST 2014


            Bug ID: 18711
           Summary: -Wcast-align doesn't special case char*
           Product: clang
           Version: 3.4
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: htam at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

$ cat foo.c
void foo(char* bar) {
    *(int*)(bar + 4) = 7;

$ clang foo.c -c -o /dev/null -Wcast-align
foo.c:2:6: warning: cast from 'char *' to 'int *' increases required alignment
     from 1 to 4 [-Wcast-align]
   *(int*)(bar + 4) = 7;
1 warning generated.

The -Wcast-align warning should not be generated by casts from char*, since it
is magical and often points to things that are not remotely related to char.

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