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authorGabriel F. T. Gomes <gftg@linux.vnet.ibm.com>2016-12-09 11:41:55 -0200
committerGabriel F. T. Gomes <gftg@linux.vnet.ibm.com>2017-05-17 18:59:23 -0300
commit477bf19a590b6e6de65f326cb00dcb8999fa8b26 (patch)
treeabb4d8a31bc1a82c783d021e2a7991b7e923c408 /misc/sys
parentb2980e3c545294d71b3960ce74b6148e274d2488 (diff)
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float128: Extend __MATH_TG for float128 support
* math/math.h (__MATH_TG): Extend the conditions to add _Float128 support. * misc/sys/cdefs.h (__HAVE_GENERIC_SELECTION): New macro.
Diffstat (limited to 'misc/sys')
-rw-r--r--misc/sys/cdefs.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 74f9a49b05..06523bfe9c 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -464,4 +464,20 @@
# define __glibc_macro_warning(msg)
#endif
+/* Support for generic selection (ISO C11) is available in GCC since
+ version 4.9. Previous versions do not provide generic selection,
+ even though they might set __STDC_VERSION__ to 201112L, when in
+ -std=c11 mode. Thus, we must check for !defined __GNUC__ when
+ testing __STDC_VERSION__ for generic selection support.
+ On the other hand, Clang also defines __GNUC__, so a clang-specific
+ check is required to enable the use of generic selection. */
+#if __GNUC_PREREQ (4, 9) \
+ || __glibc_clang_has_extension (c_generic_selections) \
+ || (!defined __GNUC__ && defined __STDC_VERSION__ \
+ && __STDC_VERSION__ >= 201112L)
+# define __HAVE_GENERIC_SELECTION 1
+#else
+# define __HAVE_GENERIC_SELECTION 0
+#endif
+
#endif /* sys/cdefs.h */