[glibc/zack/more-obsolete-typedefs] <sys/cdefs.h>: Inhibit macro expansion for __glibc_has_include

[glibc/zack/more-obsolete-typedefs] <sys/cdefs.h>: Inhibit macro expansion for __glibc_has_include

[Zack Weinberg]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8d141877e07cc594e9fefc3795b8ba729288093c

commit 8d141877e07cc594e9fefc3795b8ba729288093c
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Jun 14 15:46:02 2019 +0200

    <sys/cdefs.h>: Inhibit macro expansion for __glibc_has_include
    
    This is currently ineffective with GCC because of GCC PR 80005, but
    it makes sense to anticipate a fix for this defect.
    
    Suggested by Zack Weinberg.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 ChangeLog        | 6 ++++++
 misc/sys/cdefs.h | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index fc12a3e..4aae5e7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2019-06-14  Florian Weimer  <fweimer@redhat.com>
+
+	* misc/sys/cdefs.h (__glibc_has_include): Do not use a
+	function-like macro, so that __has_include can inhibit expansion
+	of its argument.
+
 2019-06-13  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/unix/sysv/linux/bits/in.h (IPV6_ROUTER_ALERT_ISOLATE):
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 638872b..f1bd994 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -413,7 +413,9 @@
 #endif
 
 #ifdef __has_include
-# define __glibc_has_include(header)	__has_include (header)
+/* Do not use a function-like macro, so that __has_include can inhibit
+   macro expansion.  */
+# define __glibc_has_include __has_include
 #else
 # define __glibc_has_include(header)	0
 #endif