Open Radar

 
Summary:
The Clang LLVM 1.0 compiler warns when %m is included in the format argument to asl_log even though %m is valid there (it is replaced with the current error message).

Steps to Reproduce:
1. Open Xcode 3.2.1
2. Create a new Command Line Tool project
3. Change main.c to the following:
#include <stdio.h>
#include <asl.h>

int main (int argc, const char * argv[]) {
    aslclient asl = asl_open(NULL, "FormatStringWarning", ASL_OPT_STDERR);
    
    asl_log(asl, NULL, ASL_LEVEL_ERR, "Error: %m");
    
    asl_close(asl);
    return 0;
}
4. Select the project in the left hand pane and press Cmd-I to open the project info window.
5. Choose "Clang LLVM 1.0" as the "C/C++ Compiler Warning".
6. Press Cmd-B to build the project.

Expected Results:
The project should build without errors or warnings.

Actual Results:
The project builds without errors but the following warning is issued:
/Users/francis/Code/BugReports/FormatStringWarning/main.c:7:47 /Users/francis/Code/BugReports/FormatStringWarning/main.c:7:47:{7:39-7:50}: warning: invalid conversion '%m' [-Wformat]

Regression:
Does not occur with GCC 4.2.

Notes:
Example project attached.