------- Comment #10 from hjl dot tools at gmail dot com  2010-02-21 16:47 -------
[hjl@gnu-6 gcc]$ cat /tmp/x.i
float f5(float x, int y)
{
  return x * y;
}
[hjl@gnu-6 gcc]$ gcc -S /tmp/x.i -Wconversion -m32 -std=c99
/tmp/x.i: In function ‘f5’:
/tmp/x.i:3: warning: conversion to ‘float’ from ‘int’ may alter its value
[hjl@gnu-6 gcc]$ ./xgcc -B./ -S /tmp/x.i -Wconversion -m32 -std=c99
[hjl@gnu-6 gcc]$ 


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43128