devel/wasi-compiler-rt12: new port

step one in unbreaking www/firefox in 2021Q4: we need a wasi-compiler-rt
port which matches the clang building firefox, which in turn has to
match rust's embedded llvm. rust 1.55 on 2021Q4 has llvm 12.

(cherry picked from commit 0741c12be4)
(also connects devel/wasi-compiler-rt13, which was missed in a previous
cherry-pick)

devel/Makefile

@@ -7115,6 +7115,8 @@
     SUBDIR += wand-libconfig
     SUBDIR += wandio
     SUBDIR += wasi-compiler-rt11
+    SUBDIR += wasi-compiler-rt12
+    SUBDIR += wasi-compiler-rt13
     SUBDIR += wasi-libc
     SUBDIR += wasi-libcxx
     SUBDIR += wasm3

devel/wasi-compiler-rt12/Makefile

@@ -0,0 +1,52 @@
+PORTNAME=	compiler-rt
+DISTVERSION=	12.0.1
+CATEGORIES=	devel lang
+MASTER_SITES=	https://github.com/llvm/llvm-project/releases/download/llvmorg-${DISTVERSION:S/rc/-rc/}/ \
+		https://${PRE_}releases.llvm.org/${LLVM_RELEASE}/${RCDIR}
+PKGNAMEPREFIX=	wasi-
+PKGNAMESUFFIX=	${LLVM_SUFFIX}
+DISTNAME=	llvm-project-${DISTVERSION}.src
+DISTFILES=	llvm-project-${DISTVERSION}.src${EXTRACT_SUFX}
+
+MAINTAINER=	cmt@FreeBSD.org
+COMMENT=	Clang builtins library for WebAssembly System Interface
+
+LICENSE=	LLVM2
+LICENSE_FILE=	${WRKSRC}/llvm/LICENSE.TXT
+LICENSE_NAME=	Apache License 2.0 with LLVM Exceptions
+LICENSE_PERMS=	dist-mirror dist-sell pkg-mirror pkg-sell auto-accept
+
+DEPRECATED=	this ports exists solely for building Firefox 95+ in 2021Q4
+EXPIRATION_DATE=2022-01-15
+
+LLVM_RELEASE=	${DISTVERSION:C/rc.*//}
+LLVM_SUFFIX=	${LLVM_RELEASE:C/\.[0-9]\.[0-9]$//}
+LLVM_PREFIX=	${PREFIX}/llvm${LLVM_SUFFIX}
+
+WASI_SYSROOT=	${LOCALBASE}/share/wasi-sysroot
+
+BUILD_DEPENDS=	${WASI_SYSROOT}/include/stdarg.h:devel/wasi-libc \
+		clang${LLVM_SUFFIX}:devel/llvm${LLVM_SUFFIX}
+
+USES=		cmake tar:xz
+NO_ARCH=	yes
+
+PLIST_FILES=	llvm${LLVM_SUFFIX}/lib/clang/${LLVM_RELEASE}/lib/wasi/libclang_rt.builtins-wasm32.a
+
+CC=		${LOCALBASE}/bin/clang${LLVM_SUFFIX}
+CXX=		${LOCALBASE}/bin/clang++${LLVM_SUFFIX}
+
+CMAKE_SOURCE_PATH=	${WRKSRC}/compiler-rt/lib/builtins
+CMAKE_INSTALL_PREFIX=	${LLVM_PREFIX}/lib/clang/${LLVM_RELEASE}
+CMAKE_ARGS=	-DCMAKE_C_COMPILER_WORKS=1 \
+		-DCMAKE_SYSROOT=${WASI_SYSROOT} \
+		-DLLVM_CONFIG_PATH=${LOCALBASE}/bin/llvm-config${LLVM_SUFFIX} \
+		-DCOMPILER_RT_OS_DIR=wasi \
+		-DCOMPILER_RT_BAREMETAL_BUILD=TRUE \
+		-DCOMPILER_RT_DEFAULT_TARGET_TRIPLE=wasm32-wasi \
+		-DCOMPILER_RT_EXCLUDE_ATOMIC_BUILTIN=TRUE
+
+post-build:
+	${LOCALBASE}/bin/llvm-ranlib${LLVM_SUFFIX} ${CONFIGURE_WRKSRC}/lib/wasi/*.a
+
+.include <bsd.port.mk>

devel/wasi-compiler-rt12/distinfo

@@ -0,0 +1,3 @@
+TIMESTAMP = 1638258887
+SHA256 (llvm-project-12.0.1.src.tar.xz) = 129cb25cd13677aad951ce5c2deb0fe4afc1e9d98950f53b51bdcfb5a73afa0e
+SIZE (llvm-project-12.0.1.src.tar.xz) = 90910004

devel/wasi-compiler-rt12/pkg-descr

@@ -0,0 +1,7 @@
+The LLVM Project is a collection of modular and reusable compiler and
+toolchain technologies.
+
+This port includes Clang builtins for WASI
+(WebAssembly System Interface).
+
+WWW: http://llvm.org/