devel/qbe: add port qbe - an embeddable compiler backend

The qbe program translates intermediate language (IL) code into
assembler code of supported processors (amd64, arm64, and riscv64).

devel/Makefile

@@ -5544,6 +5544,7 @@
     SUBDIR += pysvn
     SUBDIR += pythontidy
     SUBDIR += pytype
+    SUBDIR += qbe
     SUBDIR += qbs
     SUBDIR += qca
     SUBDIR += qconf

devel/qbe/Makefile

@@ -0,0 +1,25 @@
+PORTNAME=	qbe
+DISTVERSION=	g20220411
+CATEGORIES=	devel
+MASTER_SITES=	https://c9x.me/git/qbe.git/snapshot/
+DISTNAME=	qbe-2caa26e388b
+
+MAINTAINER=	se@FreeBSD.org
+COMMENT=	Embeddable compiler backend for C type languages
+
+LICENSE=	MIT
+LICENSE_FILE=	${WRKSRC}/LICENSE
+
+USES=		gmake
+
+OPTIONS_DEFINE=	DOCS
+
+do-build:
+		cd ${WRKSRC}; ${GMAKE}
+
+do-install:
+		${INSTALL_PROGRAM} ${WRKSRC}/obj/qbe ${STAGEDIR}${PREFIX}/bin
+		${MKDIR} ${STAGEDIR}${DOCSDIR}
+		${INSTALL_DATA} ${WRKSRC}/doc/*.txt ${STAGEDIR}${DOCSDIR}/
+
+.include <bsd.port.mk>

devel/qbe/distinfo

@@ -0,0 +1,3 @@
+TIMESTAMP = 1651151683
+SHA256 (qbe-2caa26e388b.tar.gz) = 508b22d9792016627b56a04c9167e16cd9303c7d35c2630edefdd57a2bfaec4d
+SIZE (qbe-2caa26e388b.tar.gz) = 351810

devel/qbe/pkg-descr

@@ -0,0 +1,8 @@
+QBE aims to be a pure C embeddable backend that provides 70% of
+the performance of advanced compilers in 10% of the code.
+
+Its small size serves both its aspirations of correctness and
+our ability to understand, fix, and improve it. It also serves
+its users by providing trivial integration and great flexibility.
+
+WWW: https://c9x.me/compile/

devel/qbe/pkg-plist

@@ -0,0 +1,6 @@
+bin/qbe
+%%PORTDOCS%%%%DOCSDIR%%/abi.txt
+%%PORTDOCS%%%%DOCSDIR%%/il.txt
+%%PORTDOCS%%%%DOCSDIR%%/llvm.txt
+%%PORTDOCS%%%%DOCSDIR%%/rv64.txt
+%%PORTDOCS%%%%DOCSDIR%%/win.txt