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Warn on unsupported fortification levels 

Make the _FORTIFY_SOURCE macro soup in features.h warn about
unsupported fortification levels.  For example, it will warn about
_FORTIFY_SOURCE=3 and over with an indication of which level has been
selected.

Co-authored-by: Paul Eggert <eggert@cs.ucla.edu>
This commit is contained in:
Siddhesh Poyarekar 2020-12-10 16:47:02 +05:30
parent 41f013cef2
commit 2a08b6e833
1 changed files with 3 additions and 0 deletions
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3
include/features.h
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@ -398,6 +398,9 @@
# elif !__GNUC_PREREQ (4, 1)
# warning _FORTIFY_SOURCE requires GCC 4.1 or later
# elif _FORTIFY_SOURCE > 1
# if _FORTIFY_SOURCE > 2
# warning _FORTIFY_SOURCE > 2 is treated like 2 on this platform
# endif
# define __USE_FORTIFY_LEVEL 2
# else
# define __USE_FORTIFY_LEVEL 1