I have installed Clang in my machine (ubuntu) in order to find memory leaks in my C code. I wrote a sample code in order to check the working of it which is as follows:
/* File: hello.c for leak detection */
#include <stdio.h>
#include <stdlib.h>
void *x;
int main() {
x = malloc(2);
x = 0; // Memory leak
return 0;
}
I found some options in internet to compile like
$ scan-build clang --analyze hello.c
and
$ scan-build clang -fsanitize=address hello.c
But none of them are showing any signs of memory leak.
scan-build: Using '/usr/bin/clang' for static analysis
scan-build: Removing directory '/tmp/scan-build-2015-07-02-122717-16928-1' because it contains no reports.
scan-build: No bugs found.
Can anyone kindly tell how to correctly use Clang for Memory leak detection.
Interestingly, the clang static analyzer finds the memory leak if you declare void *x inside main:
int main() {
void *x = malloc(2);
x = 0; // Memory leak
return 0;
}
Analyzing this code by running:
scan-build clang -g hello.c
gives a warning like:
hello.c:9:3: warning: Potential leak of memory pointed to by 'x'
return 0;
^~~~~~~~