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commit 7163ace3318d666d40771f5c8e7c4a148827070f
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Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Date: Thu Nov 12 12:09:56 2020 +0530
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Use __builtin___stpncpy_chk when available
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The builtin has been available in gcc since 4.7.0 and in clang since
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2.6. This fixes stpncpy fortification with clang since it does a
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better job of plugging in __stpncpy_chk in the right place than the
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header hackery.
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This has been tested by building and running all tests with gcc 10.2.1
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and also with clang tip as of a few days ago (just the tests in debug/
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since running all tests don't work with clang at the moment) to make
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sure that both compilers pass the stpncpy tests.
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diff --git a/string/bits/string_fortified.h b/string/bits/string_fortified.h
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index a07ab0dbc8c8dd5b..4ed6755a6c1ca247 100644
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--- a/string/bits/string_fortified.h
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+++ b/string/bits/string_fortified.h
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@@ -106,7 +106,13 @@ __NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
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return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
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}
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-/* XXX We have no corresponding builtin yet. */
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+#if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
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+__fortify_function char *
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+__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
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+{
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+ return __builtin___stpncpy_chk (__dest, __src, __n, __bos (__dest));
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+}
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+#else
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extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
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size_t __destlen) __THROW;
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extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
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@@ -120,6 +126,7 @@ __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
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return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
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return __stpncpy_alias (__dest, __src, __n);
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}
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+#endif
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__fortify_function char *
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