/in/foo.cc: In function 'int gcd(int, int)':
/in/foo.cc:29:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(r==0)
   ^~
/in/foo.cc:31:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
    a=b; b=r;
    ^