<sys/cdefs.h>: Add __glibc_has_include macro

diff --git a/ChangeLog b/ChangeLog
index 01fc0988654a30546c9a86f94d6d172834ccd059..003302317913ae30d355ebeca23d3b4519ace083 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2019-06-12  Florian Weimer  <fweimer@redhat.com>
+
+       * misc/sys/cdefs.h (__glibc_has_include): Define.
+
 2019-06-12  Wilco Dijkstra  <wdijkstr@arm.com>
 
        * string/memmem.c (__memmem): Rewrite to improve performance.

diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index b1695376dc07872ccbb8d7dfec2e5c2975187f62..638872b87b53b31b7cadad546aace637134690c0 100644 (file)
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -412,6 +412,12 @@
 # define __glibc_has_attribute(attr)   0
 #endif
 
+#ifdef __has_include
+# define __glibc_has_include(header)   __has_include (header)
+#else
+# define __glibc_has_include(header)   0
+#endif
+
 #if (!defined _Noreturn \
      && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
      &&  !__GNUC_PREREQ (4,7))