2017-08-21 14:07:18 +00:00
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From c2921b17a37e887b8a5ca9d84b875b9ba702b79c Mon Sep 17 00:00:00 2001
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From: "Gabriel F. T. Gomes" <gftg@linux.vnet.ibm.com>
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Date: Mon, 21 Aug 2017 14:23:27 +0200
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Subject: [PATCH 10] Do not use __builtin_types_compatible_p in C++ mode
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(bug 21930)
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The logic to define isinf for float128 depends on the availability of
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__builtin_types_compatible_p, which is only available in C mode,
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however, the conditionals do not check for C or C++ mode. This lead to
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an error in libstdc++ configure, as reported by bug 21930.
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This patch adds a conditional for C mode in the definition of isinf for
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float128. No definition is provided in C++ mode, since libstdc++
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headers undefine isinf.
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Tested for powerpc64le (glibc test suite and libstdc++-v3 configure).
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[BZ #21930]
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* math/math.h (isinf): Check if in C or C++ mode before using
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__builtin_types_compatible_p, since this is a C mode feature.
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(cherry picked from commit 47a67213a9f51c5f8816d240500b10db605d8b77)
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---
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ChangeLog | 6 ++++++
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NEWS | 1 +
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math/math.h | 8 ++++++--
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3 files changed, 13 insertions(+), 2 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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2017-10-10 14:38:13 +00:00
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index 6886cd9361..415fa3cc79 100644
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2017-08-21 14:07:18 +00:00
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,9 @@
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+2017-08-18 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
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+
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+ [BZ #21930]
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+ * math/math.h (isinf): Check if in C or C++ mode before using
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+ __builtin_types_compatible_p, since this is a C mode feature.
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+
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2017-08-10 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
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[BZ #21941]
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diff --git a/NEWS b/NEWS
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2017-10-10 14:38:13 +00:00
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index d57c4052cf..75b82c899e 100644
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2017-08-21 14:07:18 +00:00
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--- a/NEWS
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+++ b/NEWS
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@@ -11,6 +11,7 @@ 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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+ [21930] Do not use __builtin_types_compatible_p in C++ mode
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[21932] Unpaired __resolv_context_get in generic get*_r implementation
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Version 2.26
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diff --git a/math/math.h b/math/math.h
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2017-10-10 14:38:13 +00:00
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index e21708045a..dea8dbe1ae 100644
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2017-08-21 14:07:18 +00:00
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--- a/math/math.h
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+++ b/math/math.h
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@@ -442,8 +442,12 @@ enum
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/* Return nonzero value if X is positive or negative infinity. */
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# if __HAVE_DISTINCT_FLOAT128 && !__GNUC_PREREQ (7,0) \
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- && !defined __SUPPORT_SNAN__
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- /* __builtin_isinf_sign is broken for float128 only before GCC 7.0. */
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+ && !defined __SUPPORT_SNAN__ && !defined __cplusplus
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+ /* Since __builtin_isinf_sign is broken for float128 before GCC 7.0,
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+ use the helper function, __isinff128, with older compilers. This is
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+ only provided for C mode, because in C++ mode, GCC has no support
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+ for __builtin_types_compatible_p (and when in C++ mode, this macro is
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+ not used anyway, because libstdc++ headers undefine it). */
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# define isinf(x) \
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(__builtin_types_compatible_p (__typeof (x), _Float128) \
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? __isinff128 (x) : __builtin_isinf_sign (x))
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