Red Hat EL6.1

$ g++ --version
g++ (GCC) 4.4.5 20110214 (Red Hat 4.4.5-6)

$ ccache --version
ccache version 3.1.6

--- >8 --- >8 ---
/* test.cpp */

#include <string>
#include <stdio.h>

void foo()
{
    std::string path;
    path.erase( path.find_last_not_of("/\\")+1 );
    printf("   // bigfoo 1\n");
}

--- >8 --- >8 ---

$ ccache g++ -c test.cpp
$ strings -a test.o | grep //
   // bigfoo 1


Now, modify test.cpp to say "mytest" instead of "bigfoo"

$ ccache g++ -c test.cpp
$ strings -a test.o | grep //
   // bigfoo 1

It should say "mytest" but it says "bigfoo" instead.  The object file is not re-generated.


I also tried ccache 3.1.7 from fedora http://koji.fedoraproject.org/koji/buildinfo?buildID=282043 but the bug remained.


I also tested this on OS X SnowLeopard but the bug did not exhibit itself there:

$ g++ --version
i686-apple-darwin10g++-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)


Could it be related to the compiler?