Status: upstream
https://github.com/erlang/otp/pull/658

Signed-off-by: Johan Oudinet <johan.oudinet@gmail.com>

From 73392fcb6f8fddba57de6fb7ae6eeafa0e444686 Mon Sep 17 00:00:00 2001
From: Johan Oudinet <johan.oudinet@gmail.com>
Date: Tue, 24 Mar 2015 15:54:31 +0100
Subject: [PATCH] erts: Fix incorrect use of AC_EGREP_CPP

Using 'AC_EGREP_CPP(yes' without restraining the pattern always return
true if it runs from a path containing the string 'yes'.
---
 erts/aclocal.m4   |  2 +-
 erts/configure.in | 17 +++++++++--------
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/erts/aclocal.m4 b/erts/aclocal.m4
index 5735cde..70a5b40 100644
--- a/erts/aclocal.m4
+++ b/erts/aclocal.m4
@@ -559,7 +559,7 @@ dnl
 
 AC_DEFUN(LM_SYS_MULTICAST,
 [AC_CACHE_CHECK([for multicast support], ac_cv_sys_multicast_support,
-[AC_EGREP_CPP(yes,
+[AC_EGREP_CPP(^yes$,
 [#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
diff --git a/erts/configure.in b/erts/configure.in
index b3fe48d..9e19e33 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -1555,10 +1555,11 @@ if test "$have_gethostbyname_r" = yes; then
 				    [Define to flavour of gethostbyname_r]))
 		;;
 		*)
-			AC_EGREP_CPP(yes,[#include <stdio.h>
-			  #ifdef __GLIBC__
-			  yes
-			  #endif
+			AC_EGREP_CPP(^yes$,[
+#include <stdio.h>
+#ifdef __GLIBC__
+yes
+#endif
 			  ], AC_DEFINE(HAVE_GETHOSTBYNAME_R, GHBN_R_GLIBC,
 				[Define to flavour of gethostbyname_r]))
 		;;
@@ -4303,10 +4304,10 @@ case "$erl_xcomp_without_sysroot-$with_ssl" in
 			SSL_INCLUDE="-I$dir/include"
 			old_CPPFLAGS=$CPPFLAGS
 			CPPFLAGS=$SSL_INCLUDE
-			AC_EGREP_CPP(yes,[
+			AC_EGREP_CPP(^yes$,[
 #include <openssl/opensslv.h>
 #if OPENSSL_VERSION_NUMBER >= 0x0090700fL
-  yes
+yes
 #endif
 			],[
 			ssl_found=yes
@@ -4501,10 +4502,10 @@ if test "x$SSL_APP" != "x" ; then
     AC_MSG_CHECKING(for OpenSSL kerberos 5 support)
     old_CPPFLAGS=$CPPFLAGS
     CPPFLAGS=$SSL_INCLUDE
-    AC_EGREP_CPP(yes,[
+    AC_EGREP_CPP(^yes$,[
 #include <openssl/opensslconf.h>
 #ifndef OPENSSL_NO_KRB5
-  yes
+yes
 #endif
       ],[
       AC_MSG_RESULT([yes])
-- 
2.1.0