benchmarks/unixbench: remove march optimization

Introducing OPTIMIZED_CFLAGS option to enable march.
march is disable by default, as pkg shouldn't be build with this kind
of low level optimization.

benchmarks/unixbench/Makefile

@@ -2,6 +2,7 @@ PORTNAME=	unixbench
 DISTVERSIONPREFIX=	v
 DISTVERSION=	5.1.3-51
 DISTVERSIONSUFFIX=	-g6705203
+PORTREVISION=	1
 CATEGORIES=	benchmarks
 
 MAINTAINER=	pizzamig@FreeBSD.org
@@ -22,9 +23,19 @@ USE_XORG=	x11 xext
 CFLAGS+=	-I${LOCALBASE}/include \
 			-L${LOCALBASE}/lib
 
+OPTIONS_DEFINE=	OPTIMIZED_CFLAGS
+OPTIONS_EXCLUDE_aarch64=	OPTIMIZED_CFLAGS
+MAKE_ENV=	"UB_GCC_OPTIONS=-O3 -ffast-math -fomit-frame-pointer"
+#march generates code that can be incompatibe with previous CPU generations
+OPTIMIZED_CFLAGS_MAKE_ENV=	"UB_GCC_OPTIONS=-O3 -ffast-math -fomit-frame-pointer -march=native"
+
 SUB_FILES=	unixbench
 SHEBANG_FILES=	Run pgms/gfx-x11
 
+post-patch:
+	${REINPLACE_CMD} -e 's/^CC=gcc/#CC=gcc/' ${WRKSRC}/Makefile
+	${REINPLACE_CMD} -e 's/^# GRAPHIC_TESTS = defined/GRAPHIC_TESTS = defined/' ${WRKSRC}/Makefile
+
 do-install:
 	${INSTALL_SCRIPT} ${WRKDIR}/unixbench ${STAGEDIR}${PREFIX}/bin/
 	${MKDIR} ${STAGEDIR}${PREFIX}/libexec/unixbench