[PATCH] powerpc: Export __parse_hwcap_and_convert_at_platform to, libc.a

[Carlos Eduardo Seo]

Hi

Commit 67385a01d229751569b6aac067ffdcd813a15d7a added a new feature for 
powerpc, where we store HWCAP/Platform bits in the TCB.  In the dynamic 
linking case, we use the versioned symbol 
'__parse_hwcap_and_convert_at_platform' to verify if this feature is 
available.  However, the same symbol was not exported to libc.a, making 
it not possible for GCC to check for it prior to link time. This patch 
fixes that.

Regards,

-- 
Carlos Eduardo Seo
Software Engineer - Linux on Power Toolchain
cseo@linux.vnet.ibm.com

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From 94b6691fd1ac57c3b70bd03e376c8170c8920a9e Mon Sep 17 00:00:00 2001
From: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Date: Wed, 9 Dec 2015 18:48:04 -0200
Subject: [PATCH] powerpc: Export __parse_hwcap_and_convert_at_platform to
 libc.a.

Commit 67385a01d229751569b6aac067ffdcd813a15d7a added a new feature for
powerpc, where we store HWCAP/Platform bits in the TCB.  In the dynamic linking
case, we use the versioned symbol '__parse_hwcap_and_convert_at_platform' to
verify if this feature is available.  However, the same symbol was not exported
to libc.a, making it not possible for GCC to check for it prior to link time.

2015-12-15  Carlos Eduardo Seo  <cseo@linux.vnet.ibm.com>

	* sysdeps/powerpc/hwcapinfo.c: Export symbol
	__parse_hwcap_and_convert_at_platform to libc.a.
---
 sysdeps/powerpc/hwcapinfo.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sysdeps/powerpc/hwcapinfo.c b/sysdeps/powerpc/hwcapinfo.c
index a115ffc..b885f1c 100644
--- a/sysdeps/powerpc/hwcapinfo.c
+++ b/sysdeps/powerpc/hwcapinfo.c
@@ -74,3 +74,11 @@ __tcb_parse_hwcap_and_convert_at_platform (void)
 versioned_symbol (ld, __tcb_parse_hwcap_and_convert_at_platform, \
 		  __parse_hwcap_and_convert_at_platform, GLIBC_2_23);
 #endif
+
+/* Export __parse_hwcap_and_convert_at_platform in libc.a.  This is used by
+   GCC to make sure that the HWCAP/Platform bits are stored in the TCB when
+   using __builtin_cpu_is()/__builtin_cpu_supports() in the static case.  */
+#ifndef SHARED
+weak_alias (__tcb_parse_hwcap_and_convert_at_platform, \
+	    __parse_hwcap_and_convert_at_platform);
+#endif
-- 
2.5.4 (Apple Git-61)