Gcc profile questions

[Richard Biener]

On February 19, 2019 5:19:11 PM GMT+01:00, Qing Zhao <qing.zhao@oracle.com> wrote:
>Hi,
>
>Suppose we have a program called foo which is built with gcc
>-fprofile-generate,  Now when foo is executed a bunch of .gcda files
>are created.  
>
>What happens when foo is executed more than once.  Are the .gcda files
>updated with each execution? 

Yes. 

Or are the .gcda files overwritten with
>new .gcda files (and thus contain profile info only for the last
>execution)?
>
>Thanks for the info.
>
>Qing