From: H.J. Lu <hjl.tools@gmail.com>
Date: Thu, 15 Oct 2015 20:35:40 +0000 (-0700)
Subject: Add comments for GCC 5 requirement
X-Git-Tag: glibc-2.23~336
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=983a33fa7d50aa8bcff1e0f183388c74b1b5e213;p=thirdparty%2Fglibc.git

Add comments for GCC 5 requirement

	* sysdeps/unix/sysv/linux/i386/sysdep.h: Add comments for
	GCC 5 requirement.
---

diff --git a/ChangeLog b/ChangeLog
index 77878ded96b..6f103e86320 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-10-15  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* sysdeps/unix/sysv/linux/i386/sysdep.h: Add comments for
+	GCC 5 requirement.
+
 2015-10-15  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/i386/configure.ac (libc_cv_as_i686): Remove configure
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h
index 5324da6329a..76db7b8ab95 100644
--- a/sysdeps/unix/sysv/linux/i386/sysdep.h
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.h
@@ -227,6 +227,10 @@
 extern int __syscall_error (int)
   attribute_hidden __attribute__ ((__regparm__ (1)));
 
+/* Since GCC 5 and above can properly spill %ebx with PIC when needed,
+   we can inline syscalls with 6 arguments if GCC 5 or above is used
+   to compile glibc.  */
+
 #if !__GNUC_PREREQ (5,0)
 /* We need some help from the assembler to generate optimal code.  We
    define some macros here which later will be used.  */