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commit c5c792092b57687ae3ebecbe8645fa71ddb19f8c
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Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Date: Thu Feb 2 07:49:02 2023 -0500
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cdefs: Limit definition of fortification macros
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Define the __glibc_fortify and other macros only when __FORTIFY_LEVEL >
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0. This has the effect of not defining these macros on older C90
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compilers that do not have support for variable length argument lists.
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Also trim off the trailing backslashes from the definition of
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__glibc_fortify and __glibc_fortify_n macros.
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Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Reviewed-by: Florian Weimer <fweimer@redhat.com>
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(cherry picked from commit 2337e04e21ba6040926ec871e403533f77043c40)
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diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
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index b166f3d209fe361f..92dbd3e1fc68dae7 100644
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--- a/misc/sys/cdefs.h
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+++ b/misc/sys/cdefs.h
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@@ -151,6 +151,7 @@
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# define __glibc_objsize(__o) __bos (__o)
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#endif
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+#if __USE_FORTIFY_LEVEL > 0
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/* Compile time conditions to choose between the regular, _chk and _chk_warn
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variants. These conditions should get evaluated to constant and optimized
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away. */
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@@ -186,7 +187,7 @@
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? __ ## f ## _alias (__VA_ARGS__) \
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: (__glibc_unsafe_len (__l, __s, __osz) \
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? __ ## f ## _chk_warn (__VA_ARGS__, __osz) \
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- : __ ## f ## _chk (__VA_ARGS__, __osz))) \
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+ : __ ## f ## _chk (__VA_ARGS__, __osz)))
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/* Fortify function f, where object size argument passed to f is the number of
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elements and not total size. */
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@@ -196,7 +197,8 @@
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? __ ## f ## _alias (__VA_ARGS__) \
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: (__glibc_unsafe_len (__l, __s, __osz) \
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? __ ## f ## _chk_warn (__VA_ARGS__, (__osz) / (__s)) \
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- : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s)))) \
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+ : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s))))
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+#endif
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#if __GNUC_PREREQ (4,3)
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# define __warnattr(msg) __attribute__((__warning__ (msg)))
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