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fortify: Ensure that __glibc_fortify condition is a constant [BZ #29141]
The fix c8ee1c85
introduced a -1 check for object size without also
checking that object size is a constant. Because of this, the tree
optimizer passes in gcc fail to fold away one of the branches in
__glibc_fortify and trips on a spurious Wstringop-overflow. The warning
itself is incorrect and the branch does go away eventually in DCE in the
rtl passes in gcc, but the constant check is a helpful hint to simplify
code early, so add it in.
Resolves: BZ #29141
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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@ -164,7 +164,7 @@
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/* Length is known to be safe at compile time if the __L * __S <= __OBJSZ
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condition can be folded to a constant and if it is true, or unknown (-1) */
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#define __glibc_safe_or_unknown_len(__l, __s, __osz) \
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((__osz) == (__SIZE_TYPE__) -1 \
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((__builtin_constant_p (__osz) && (__osz) == (__SIZE_TYPE__) -1) \
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|| (__glibc_unsigned_or_positive (__l) \
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&& __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \
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(__s), (__osz))) \
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