[LLVMbugs] [Bug 12624] New: Clang error when trying to printf the value of a void function

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sun Apr 22 14:19:17 PDT 2012


             Bug #: 12624
           Summary: Clang error when trying to printf the value of a void
           Product: clang
           Version: 3.0
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: adriafarres at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 8425
  --> http://llvm.org/bugs/attachment.cgi?id=8425
Terminal's output

Basically, when trying to printf a void function, it leads to an error. The
code to reproduce the error is:
#include <stdio.h>

void add(int n);

int main()
    int p=5;
    printf("%d", add(p));
    return 0;

void add(int n)
I attach both the output of Clang in the terminal and the diagnostic of the
preprocessor, though you will probably be able to reproduce it.

GCC's output is as simple as:

file.c:8:2: error: invalid use of void expression.

I think there is nothing else hidden in the code. I'm not an experienced
programmer, so it is a simple error.

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