GNU C Library master sources branch master updated. glibc-2.26.9000-725-g4e2dff6

[jsm28 at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=4e2dff67beeb063cb36fe100d9d2b3f2f88d80c6

commit 4e2dff67beeb063cb36fe100d9d2b3f2f88d80c6
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Nov 6 13:26:15 2017 +0000

    Do not declare _Float128 support for powerpc64le -mlong-double-64 (bug 22402).
    
    The powerpc bits/floatn.h declares _Float128 support to be present
    when the compiler supports it for powerpc64le.  However, in the case
    where -mlong-double-64 is used, __MATH_TG does not actually support
    _Float128; it only supports _Float128 in the distinct-long-double
    case.
    
    This shows up as a build failure when building glibc mainline with GCC
    mainline, given the recently added sanity check in math.h for
    configurations supported by __MATH_TG, as the compat code for
    -mlong-double-64 fails to build.  However, the bug was logically
    present before that change (including in 2.26), just less visible.
    
    This patch fixes the build failure by declaring _Float128 to be
    unsupported in that case.  (Of course this can't actually stop users
    calling the type-generic macros with _Float128 arguments with
    -mlong-double-64, just as they could be called with other unsupported
    types on other platforms, but perhaps makes it less likely by making
    all the type-specific _Float128 interfaces invisible in that case.)
    
    Tested compilation for powerpc64le with build-many-glibcs.py.
    
    	[BZ #22402]
    	* sysdeps/powerpc/bits/floatn.h: Include <bits/long-double.h>.
    	[__NO_LONG_DOUBLE_MATH] (__HAVE_FLOAT128): Define to 0.

diff --git a/ChangeLog b/ChangeLog
index f6f3ebf..acd573c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2017-11-06  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #22402]
+	* sysdeps/powerpc/bits/floatn.h: Include <bits/long-double.h>.
+	[__NO_LONG_DOUBLE_MATH] (__HAVE_FLOAT128): Define to 0.
+
 2017-11-04  Mike FABIAN  <mfabian@redhat.com>
 
 	* localedata/locales/tpi_PG (LC_TIME): Fix wrong d_fmt, / needs
diff --git a/sysdeps/powerpc/bits/floatn.h b/sysdeps/powerpc/bits/floatn.h
index 44a9434..a293bfc 100644
--- a/sysdeps/powerpc/bits/floatn.h
+++ b/sysdeps/powerpc/bits/floatn.h
@@ -20,12 +20,13 @@
 #define _BITS_FLOATN_H
 
 #include <features.h>
+#include <bits/long-double.h>
 
 /* Defined to 1 if the current compiler invocation provides a
    floating-point type with the IEEE 754 binary128 format, and this glibc
    includes corresponding *f128 interfaces for it.  */
 #if defined _ARCH_PWR8 && defined __LITTLE_ENDIAN__ && (_CALL_ELF == 2) \
-    && defined __FLOAT128__
+    && defined __FLOAT128__ && !defined __NO_LONG_DOUBLE_MATH
 # define __HAVE_FLOAT128 1
 #else
 # define __HAVE_FLOAT128 0

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                     |    6 ++++++
 sysdeps/powerpc/bits/floatn.h |    3 ++-
 2 files changed, 8 insertions(+), 1 deletions(-)


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