forked from rpms/glibc
75bedb0a34
- Auto-sync with upstream master. - Revert to only defining __extern_always_inline for g++-4.3+. - Fix build failure in compat-gcc-32 (#186410).
127 lines
4.7 KiB
Diff
127 lines
4.7 KiB
Diff
From 0998aff9be4f0a25b7a822c4f28e832d367977c6 Mon Sep 17 00:00:00 2001
|
|
From: Siddhesh Poyarekar <siddhesh@redhat.com>
|
|
Date: Wed, 13 Aug 2014 23:28:18 +0530
|
|
Subject: [PATCH] Revert to defining __extern_inline only for gcc-4.3+
|
|
|
|
The check for only __GNUC_STDC_INLINE__ and __GNUC_GNU_INLINE__ may
|
|
not be sufficient since those flags were added during initial support
|
|
for C99 inlining semantics. There is also a problem with always
|
|
defining __extern_inline and __extern_always_inline, since it enables
|
|
inline wrapper functions even when GNU inlining semantics are not
|
|
guaranteed. This, along with the possibility of such wrappers using
|
|
redirection (btowc for example) could result in compiler generating an
|
|
infinitely recusrive call to the function.
|
|
|
|
In fact it was such a recursion that led to this code being written
|
|
the way it was; see:
|
|
|
|
https://bugzilla.redhat.com/show_bug.cgi?id=186410
|
|
|
|
The initial change was to fix bugs 14530 and 13741, but they can be
|
|
resolved by checking if __fortify_function and/or
|
|
__extern_always_inline are defined, as it has been done in this patch.
|
|
In addition, I have audited uses of __extern_always_inline to make
|
|
sure that none of the uses result in compilation errors.
|
|
|
|
There is however a regression in this patch for llvm, since it reverts
|
|
the llvm expectation that __GNUC_STDC_INLINE__ or __GNUC_GNU_INLINE__
|
|
definition imply proper extern inline semantics.
|
|
---
|
|
libio/stdio.h | 2 +-
|
|
math/bits/math-finite.h | 8 +++++---
|
|
misc/sys/cdefs.h | 18 ++++++++----------
|
|
3 files changed, 14 insertions(+), 14 deletions(-)
|
|
|
|
diff --git a/libio/stdio.h b/libio/stdio.h
|
|
index d8c0bdb..1f4f837 100644
|
|
--- a/libio/stdio.h
|
|
+++ b/libio/stdio.h
|
|
@@ -932,7 +932,7 @@ extern void funlockfile (FILE *__stream) __THROW;
|
|
#ifdef __USE_EXTERN_INLINES
|
|
# include <bits/stdio.h>
|
|
#endif
|
|
-#if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline
|
|
+#if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
|
|
# include <bits/stdio2.h>
|
|
#endif
|
|
#ifdef __LDBL_COMPAT
|
|
diff --git a/math/bits/math-finite.h b/math/bits/math-finite.h
|
|
index aa755de..0656645 100644
|
|
--- a/math/bits/math-finite.h
|
|
+++ b/math/bits/math-finite.h
|
|
@@ -251,7 +251,8 @@ extern long double __REDIRECT_NTH (lgammal_r, (long double, int *),
|
|
# endif
|
|
#endif
|
|
|
|
-#if defined __USE_XOPEN || defined __USE_ISOC99
|
|
+#if ((defined __USE_XOPEN || defined __USE_ISOC99) \
|
|
+ && defined __extern_always_inline)
|
|
/* lgamma. */
|
|
__extern_always_inline double __NTH (lgamma (double __d))
|
|
{
|
|
@@ -284,7 +285,8 @@ __extern_always_inline long double __NTH (lgammal (long double __d))
|
|
# endif
|
|
#endif
|
|
|
|
-#if defined __USE_MISC || defined __USE_XOPEN
|
|
+#if ((defined __USE_MISC || defined __USE_XOPEN) \
|
|
+ && defined __extern_always_inline)
|
|
/* gamma. */
|
|
__extern_always_inline double __NTH (gamma (double __d))
|
|
{
|
|
@@ -422,7 +424,7 @@ extern long double __REDIRECT_NTH (sqrtl, (long double), __sqrtl_finite);
|
|
# endif
|
|
#endif
|
|
|
|
-#ifdef __USE_ISOC99
|
|
+#if defined __USE_ISOC99 && defined __extern_always_inline
|
|
/* tgamma. */
|
|
extern double __gamma_r_finite (double, int *);
|
|
__extern_always_inline double __NTH (tgamma (double __d))
|
|
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
|
|
index 04db956..d8ee73c 100644
|
|
--- a/misc/sys/cdefs.h
|
|
+++ b/misc/sys/cdefs.h
|
|
@@ -131,7 +131,6 @@
|
|
/* Fortify support. */
|
|
#define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
|
|
#define __bos0(ptr) __builtin_object_size (ptr, 0)
|
|
-#define __fortify_function __extern_always_inline __attribute_artificial__
|
|
|
|
#if __GNUC_PREREQ (4,3)
|
|
# define __warndecl(name, msg) \
|
|
@@ -318,12 +317,10 @@
|
|
# define __attribute_artificial__ /* Ignore */
|
|
#endif
|
|
|
|
-#ifdef __GNUC__
|
|
-/* One of these will be defined if the __gnu_inline__ attribute is
|
|
- available. In C++, __GNUC_GNU_INLINE__ will be defined even though
|
|
- __inline does not use the GNU inlining rules. If neither macro is
|
|
- defined, this version of GCC only supports GNU inline semantics. */
|
|
-# if defined __GNUC_STDC_INLINE__ || defined __GNUC_GNU_INLINE__
|
|
+/* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
|
|
+ inline semantics, unless -fgnu89-inline is used. */
|
|
+#if !defined __cplusplus || __GNUC_PREREQ (4,3)
|
|
+# if defined __GNUC_STDC_INLINE__ || defined __cplusplus
|
|
# define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
|
|
# define __extern_always_inline \
|
|
extern __always_inline __attribute__ ((__gnu_inline__))
|
|
@@ -331,9 +328,10 @@
|
|
# define __extern_inline extern __inline
|
|
# define __extern_always_inline extern __always_inline
|
|
# endif
|
|
-#else /* Not GCC. */
|
|
-# define __extern_inline /* Ignore */
|
|
-# define __extern_always_inline /* Ignore */
|
|
+#endif
|
|
+
|
|
+#ifdef __extern_always_inline
|
|
+# define __fortify_function __extern_always_inline __attribute_artificial__
|
|
#endif
|
|
|
|
/* GCC 4.3 and above allow passing all anonymous arguments of an
|
|
--
|
|
1.9.3
|
|
|