[LLVMbugs] [Bug 10623] New: clang should support -Wlarger-than-num warning, like gcc

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Aug 9 14:56:10 PDT 2011


           Summary: clang should support -Wlarger-than-num warning, like
           Product: clang
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: sean at rogue-research.com
                CC: llvmbugs at cs.uiuc.edu

Consider the following C99:

int main (void)
    int foo[300000];

    return 0;

compiled with gcc:

builder7:~ builder$ gcc -Wlarger-than-300 /Users/builder/Desktop/test.c 
/Users/builder/Desktop/test.c: In function ‘main’:
/Users/builder/Desktop/test.c:3: warning: size of ‘foo’ is 1200000 bytes

compiled with clang there is no warning at all.

Previously, clang warned that the warning flaw was unknown, making swapping gcc
and clang usage with the same warning flags a PITA.  rdar://6970318 requested
that clang support or ignore the flag.  In Options.td, I see the flag is now
silently ignored.  Better.  But I'd like to see this warning supported.

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