-----Original Message----- From: gcc-help-owner@xxxxxxxxxxx [mailto:gcc-help-owner@xxxxxxxxxxx] On Behalf Of Dale Reese Sent: Wednesday, November 18, 2009 11:58 AM To: gcc-help@xxxxxxxxxxx Subject: finstrument-functions dual instrumentation problem >>Hello, >>Thank you in advance for your help. This is my first time using the mailing >>list. Please notify me if this is not the proper place for these types of >>questions. >>I am working with gcc and the ?finstrument-functions option. I have been >>trying to instrument both kerbose ftp and putty sfpt. I have noticed an >>unusual event. It seems that gcc is instrumenting the function entry and >>exit twice. Has anyone experienced this? Any ideas on what might be causing >>this? I found the problem. It seems that the CFLAG -O2 was causing the problem. My theory is that loop unrolling was causing the compiler to duplicate/unroll the instrumentation routine in certain functions. My fix is to compile without the -O2 option. I am a little skeptical about what actually was happening because I wouldn't think that The optimization would change the program in such a way as to alter its operation. This might be a bug with the way the optimizer handles code that utilizes finstrument-functions Dale Reese
