2017-08-21 16:07:18 +02:00
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From 2aa1a7a8f8b9b7879bc6eb1c34d1580f992c406d Mon Sep 17 00:00:00 2001
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From: Florian Weimer <fweimer@redhat.com>
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Date: Fri, 11 Aug 2017 15:48:14 +0200
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Subject: [PATCH 08] assert: Suppress pedantic warning caused by statement
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expression [BZ #21242]
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(cherry picked from commit 8b2c63e4e2ad1fd161f80004ed30624f2a37b57b)
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---
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ChangeLog | 7 +++++++
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NEWS | 1 +
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assert/assert.h | 12 +++++++++---
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3 files changed, 17 insertions(+), 3 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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2017-10-10 16:38:13 +02:00
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index 5ea9b8baa7..0057c0902a 100644
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2017-08-21 16:07:18 +02:00
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,10 @@
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+2017-08-11 Florian Weimer <fweimer@redhat.com>
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+
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+ [BZ #21242]
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+ * assert/assert.h [__GNUC__ && !__STRICT_ANSI__] (assert):
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+ Suppress pedantic warning resulting from statement expression.
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+ (__ASSERT_FUNCTION): Add missing __extension__.
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+
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2017-08-10 Florian Weimer <fweimer@redhat.com>
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* malloc/malloc.c (get_max_fast): Reimplement as an inline
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diff --git a/NEWS b/NEWS
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2017-10-10 16:38:13 +02:00
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index ec6cf34122..d57c4052cf 100644
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2017-08-21 16:07:18 +02:00
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--- a/NEWS
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+++ b/NEWS
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@@ -9,6 +9,7 @@ Version 2.26.1
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The following bugs are resolved with this release:
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+ [21242] assert: Suppress pedantic warning caused by statement expression
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[21885] getaddrinfo: Release resolver context on error in gethosts
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[21932] Unpaired __resolv_context_get in generic get*_r implementation
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diff --git a/assert/assert.h b/assert/assert.h
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2017-10-10 16:38:13 +02:00
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index 22f019537c..6801cfeb10 100644
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2017-08-21 16:07:18 +02:00
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--- a/assert/assert.h
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+++ b/assert/assert.h
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@@ -91,13 +91,19 @@ __END_DECLS
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? __ASSERT_VOID_CAST (0) \
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: __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION))
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# else
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+/* The first occurrence of EXPR is not evaluated due to the sizeof,
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+ but will trigger any pedantic warnings masked by the __extension__
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+ for the second occurrence. The explicit comparison against zero is
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+ required to support function pointers and bit fields in this
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+ context, and to suppress the evaluation of variable length
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+ arrays. */
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# define assert(expr) \
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- ({ \
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+ ((void) sizeof ((expr) == 0), __extension__ ({ \
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if (expr) \
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; /* empty */ \
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else \
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__assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION); \
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- })
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+ }))
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# endif
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# ifdef __USE_GNU
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@@ -113,7 +119,7 @@ __END_DECLS
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C9x has a similar variable called __func__, but prefer the GCC one since
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it demangles C++ function names. */
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# if defined __cplusplus ? __GNUC_PREREQ (2, 6) : __GNUC_PREREQ (2, 4)
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-# define __ASSERT_FUNCTION __PRETTY_FUNCTION__
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+# define __ASSERT_FUNCTION __extension__ __PRETTY_FUNCTION__
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# else
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# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
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# define __ASSERT_FUNCTION __func__
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