From: Patrick Herbst <paherbst@gmail.com>
To: gcc-help <gcc-help@gcc.gnu.org>
Subject: Optimization auto-setting _FORTIFY_SOURCE ??
Date: Sun, 29 Jan 2023 18:05:14 -0500 [thread overview]
Message-ID: <CACMdL5JQAf07dknwFq9DrQn_7rw-i-Z7PnOJ1H59fURe+jQnGw@mail.gmail.com> (raw)
Using GCC 9.4, I've noticed setting -O1 will set
_FORTIFY_SOURCE=2
I'm able to see this by running
gcc -c -E -dM -O1 - < /dev/null | grep FORTIFY_SOURCE
But running the same command without -O1 doesn't set it.
Is this documented? is this expected behavior? I could not find any
reference to how optimization leads to setting this macro.
Any tips on where I can look, or what i'm missing to see this connection?
Thanks!
next reply other threads:[~2023-01-29 23:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-29 23:05 Patrick Herbst [this message]
2023-01-30 4:23 ` Xi Ruoyao
2023-01-30 4:57 ` LIU Hao
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