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From: "adhemerval.zanella at linaro dot org"
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Subject: [Bug manual/28998] Document -D_FORTIFY_SOURCE
Date: Thu, 24 Mar 2022 12:27:10 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28998

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |adhemerval.zanella at lina=
ro dot o
                   |                            |rg

--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot or=
g> ---
It is documented briefly on manual/creature.texi:

303 @defvr Macro _FORTIFY_SOURCE
304 @standards{GNU, (none)}
305 If this macro is defined to @math{1}, security hardening is added to
306 various library functions.  If defined to @math{2}, even stricter
307 checks are applied. If defined to @math{3}, @theglibc{} may also use
308 checks that may have an additional performance overhead.
309 @end defvr

But there is no further explanation of exactly each level enables, the
functions covered, and how it plays with compiler.

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