Fix build on gcc-based architectures by removing the assumption that FreeBSD

must imply clang.  While here, remove duplicate definition from USES.

PR:		234580
Submitted by:	Piotr Kubaj
Approved by:	portmgr (tier-2 blanket)

databases/percona57-server/Makefile

@@ -22,7 +22,7 @@ LIB_DEPENDS=	libevent.so:devel/libevent \
 
 SLAVEDIRS=	databases/percona57-client \
 		databases/percona57-pam-for-mysql
-USES=		bison:build cmake:insource,noninja compiler:c11 compiler:c++11-lib \
+USES=		bison:build cmake:insource,noninja compiler:c11 \
 		cpe libedit localbase perl5 shebangfix
 
 MY_DBDIR=	/var/db/mysql
@@ -83,8 +83,6 @@ USES+=		libedit
 .else
 LIB_DEPENDS+=	libcurl.so:ftp/curl
 
-BROKEN_powerpc64=	Does not configure: CMake Error at cmake/os/FreeBSD.cmake:34 (MESSAGE): Unsupported compiler!
-
 # MySQL-Server part
 OPTIONS_DEFINE=	OPENSSL FASTMTX INNODBMEMCACHED TOKUDB
 OPTIONS_DEFAULT=	OPENSSL INNODBMEMCACHED
@@ -151,6 +149,10 @@ post-patch:
 
 .include <bsd.port.pre.mk>
 
+.if ${CHOSEN_COMPILER_TYPE} == gcc
+CXXFLAGS+=	-fpermissive
+.endif
+
 .if ${ARCH} == "arm"
 BROKEN=		Does not compile on arm
 .endif

databases/percona57-server/files/patch-cmake_os_FreeBSD.cmake

@@ -0,0 +1,11 @@
+--- cmake/os/FreeBSD.cmake.orig	2018-12-16 19:27:57 UTC
++++ cmake/os/FreeBSD.cmake
+@@ -30,8 +30,6 @@ IF(NOT FORCE_UNSUPPORTED_COMPILER)
+     IF(NOT HAVE_SUPPORTED_CLANG_VERSION)
+       MESSAGE(FATAL_ERROR "Clang 3.3 or newer is required!")
+     ENDIF()
+-  ELSE()
+-    MESSAGE(FATAL_ERROR "Unsupported compiler!")
+   ENDIF()
+ ENDIF()
+