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From: Ed Maste <emaste@FreeBSD.org>
Date: Fri, 21 Sep 2018 17:49:37 +0000 (UTC)
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Subject: svn commit: r338861 - head/lib/libc
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Author: emaste
Date: Fri Sep 21 17:49:37 2018
New Revision: 338861
URL: https://svnweb.freebsd.org/changeset/base/338861

Log:
  libc: require ifunc-capable linker for amd64/i386
  
  We expect to introduce optimized libc routines in the near future,
  which requires use of a linker that supports ifuncs.
  
  Approved by:	re (gjb, kib)
  Sponsored by:   The FreeBSD Foundation

Modified:
  head/lib/libc/Makefile

Modified: head/lib/libc/Makefile
==============================================================================
--- head/lib/libc/Makefile	Fri Sep 21 17:44:05 2018	(r338860)
+++ head/lib/libc/Makefile	Fri Sep 21 17:49:37 2018	(r338861)
@@ -21,6 +21,11 @@ LIBC_ARCH=${MACHINE_ARCH}
 LIBC_ARCH=${MACHINE_CPUARCH}
 .endif
 
+.if (${LIBC_ARCH} == amd64 || ${LIBC_ARCH} == i386) && \
+    defined(LINKER_FEATURES) && ${LINKER_FEATURES:Mifunc} == ""
+.error ${LIBC_ARCH} libc requires linker ifunc support
+.endif
+
 # All library objects contain FreeBSD revision strings by default; they may be
 # excluded as a space-saving measure.  To produce a library that does
 # not contain these strings, add -DSTRIP_FBSDID (see <sys/cdefs.h>) to CFLAGS