[PATCH] powerpc: Fix --disable-multi-arch build on POWER8

["Tulio Magno Quites Machado Filho" <tuliom at linux dot vnet dot ibm dot com>]

Add missing symbols of stpncpy and strcasestr when multi-arch is
disabled.
Fix memset call from strncpy/stpncpy when multi-arch is disabled.

2016-05-30  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>

	* sysdeps/powerpc/powerpc64/power8/strcasestr.S (__strcasestr):
	New symbol defined as libc_hidden_def.
	(strcasestr): Became a weak alias to __strcasestr.
	* sysdeps/powerpc/powerpc64/power8/strncpy.S: Handle memset calls
	according to multi-arch support.  Move __stpncpy hidden
	definition from here to...
	* sysdeps/powerpc/powerpc64/power8/stpncpy.S: ...here.  Add
	symbol stpncpy.
	* sysdeps/powerpc/powerpc64/multiarch/stpncpy-power8.S: Undefine
	libc_hidden_builtin_def.
	* sysdeps/powerpc/powerpc64/multiarch/strncpy-power8.S: Specify which
	memset symbol to use when multi-arch support is available.
---
 sysdeps/powerpc/powerpc64/multiarch/stpncpy-power8.S |  3 +++
 sysdeps/powerpc/powerpc64/multiarch/strncpy-power8.S |  3 +++
 sysdeps/powerpc/powerpc64/power8/stpncpy.S           |  4 ++++
 sysdeps/powerpc/powerpc64/power8/strcasestr.S        |  7 +++++--
 sysdeps/powerpc/powerpc64/power8/strncpy.S           | 16 ++++++++++++----
 5 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power8.S b/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power8.S
index 804e499..e08fbe5 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power8.S
+++ b/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power8.S
@@ -36,4 +36,7 @@
   TRACEBACK(__stpncpy_power8)					\
   END_2(__stpncpy_power8)
 
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
 #include <sysdeps/powerpc/powerpc64/power8/stpncpy.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncpy-power8.S b/sysdeps/powerpc/powerpc64/multiarch/strncpy-power8.S
index 3263bbd..7522155 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strncpy-power8.S
+++ b/sysdeps/powerpc/powerpc64/multiarch/strncpy-power8.S
@@ -37,4 +37,7 @@
 #undef libc_hidden_builtin_def
 #define libc_hidden_builtin_def(name)
 
+/* memset is used to pad the end of the string.  */
+#define MEMSET __memset_power8
+
 #include <sysdeps/powerpc/powerpc64/power8/strncpy.S>
diff --git a/sysdeps/powerpc/powerpc64/power8/stpncpy.S b/sysdeps/powerpc/powerpc64/power8/stpncpy.S
index 067910b..9393dd4 100644
--- a/sysdeps/powerpc/powerpc64/power8/stpncpy.S
+++ b/sysdeps/powerpc/powerpc64/power8/stpncpy.S
@@ -18,3 +18,7 @@
 
 #define USE_AS_STPNCPY
 #include <sysdeps/powerpc/powerpc64/power8/strncpy.S>
+
+weak_alias (__stpncpy, stpncpy)
+libc_hidden_def (__stpncpy)
+libc_hidden_builtin_def (stpncpy)
diff --git a/sysdeps/powerpc/powerpc64/power8/strcasestr.S b/sysdeps/powerpc/powerpc64/power8/strcasestr.S
index 24b2b76..60015ae 100644
--- a/sysdeps/powerpc/powerpc64/power8/strcasestr.S
+++ b/sysdeps/powerpc/powerpc64/power8/strcasestr.S
@@ -81,7 +81,7 @@
 /* TODO: change this to .machine power8 when the minimum required binutils
    allows it.  */
 	.machine  power7
-EALIGN (strcasestr, 4, 0)
+EALIGN (__strcasestr, 4, 0)
 	CALL_MCOUNT 2
 	mflr	r0			/* Load link register LR to r0.  */
 	std	r31, -8(r1)		/* Save callers register r31.  */
@@ -527,5 +527,8 @@ L(end):
 	cfi_restore(r31)
 	mtlr	r0		/* Branch to link register.  */
 	blr
-END (strcasestr)
+END (__strcasestr)
+
+weak_alias (__strcasestr, strcasestr)
+libc_hidden_def (__strcasestr)
 libc_hidden_builtin_def (strcasestr)
diff --git a/sysdeps/powerpc/powerpc64/power8/strncpy.S b/sysdeps/powerpc/powerpc64/power8/strncpy.S
index 437edeb..b7fae6d 100644
--- a/sysdeps/powerpc/powerpc64/power8/strncpy.S
+++ b/sysdeps/powerpc/powerpc64/power8/strncpy.S
@@ -24,6 +24,16 @@
 # define FUNC_NAME strncpy
 #endif
 
+#ifndef MEMSET
+/* For builds without IFUNC support, local calls should be made to internal
+   GLIBC symbol (created by libc_hidden_builtin_def).  */
+# ifdef SHARED
+#  define MEMSET   __GI_memset
+# else
+#  define MEMSET   memset
+# endif
+#endif
+
 #define FRAMESIZE (FRAME_MIN_SIZE+48)
 
 /* Implements the function
@@ -223,7 +233,7 @@ L(zero_pad_start_1):
 	stdu	r1,-FRAMESIZE(r1)
 	cfi_adjust_cfa_offset(FRAMESIZE)
 
-	bl	__memset_power8
+	bl	MEMSET
 	nop
 
 	/* Restore the stack frame.  */
@@ -442,8 +452,6 @@ L(zero_pad_start_prepare_1):
 	b	L(zero_pad_start_1)
 END (FUNC_NAME)
 
-#ifdef USE_AS_STPNCPY
-libc_hidden_def (__stpncpy)
-#else
+#ifndef USE_AS_STPNCPY
 libc_hidden_builtin_def (strncpy)
 #endif
-- 
2.1.0