New port: devel/emscripten: LLVM-to-Web Compiler

Caveat: it can only work with the latest llvm-devel, at least 9.0.d20190509, see patch in bug#237819.

devel/Makefile

@@ -556,6 +556,7 @@
     SUBDIR += elixir-tzdata
     SUBDIR += elixir-unsafe
     SUBDIR += embb
+    SUBDIR += emscripten
     SUBDIR += epl.el
     SUBDIR += epm
     SUBDIR += epydoc

devel/emscripten/Makefile

+# $FreeBSD$
+
+PORTNAME=	emscripten
+DISTVERSION=	1.38.31
+CATEGORIES=	devel www
+
+MAINTAINER=	yuri@FreeBSD.org
+COMMENT=	LLVM-to-Web Compiler
+
+LICENSE=	MIT NCSA
+LICENSE_COMB=	dual
+
+RUN_DEPENDS=	llvm-devel>0:devel/llvm-devel # the upstream requires to use either the latest llvm version, or their own llvm fork called emscripten-fastcomp
+
+USES=		python shebangfix
+USE_GITHUB=	yes
+GH_ACCOUNT=	emscripten-core
+GH_PROJECT=	emscripten
+SHEBANG_FILES=	${PYSCRIPTS} emcmake tools/emdump system/bin/sdl-config system/bin/sdl2-config third_party/websockify/run third_party/websockify/websockify.py
+SHEBANG_GLOB=	*.py
+
+PYSCRIPTS=	em++ emar emcc em-config emconfigure emmake emranlib emrun emscons
+
+NO_BUILD=	yes
+NO_ARCH=	yes
+
+post-patch:
+	@${REINPLACE_CMD} -E "s|^__rootpath__ = .*|__rootpath__ = '${PREFIX}/lib/${PORTNAME}'|" ${WRKSRC}/tools/shared.py
+
+do-install:
+	${MKDIR} ${STAGEDIR}${PREFIX}/lib/${PORTNAME}
+	cd ${WRKSRC} && ${CP} -r em* cmake site src system third_party tools ${STAGEDIR}${PREFIX}/lib/${PORTNAME}/
+	${FIND} ${STAGEDIR}${PREFIX}/lib/${PORTNAME} -name "*.bat" -delete
+.for s in ${PYSCRIPTS}
+	${RLN} ${STAGEDIR}${PREFIX}/lib/${PORTNAME}/${s} ${STAGEDIR}${PREFIX}/bin/${s}
+.endfor
+	${RM} -rf ${STAGEDIR}${PREFIX}/lib/emscripten/system/lib/pkgconfig
+
+.include <bsd.port.mk>

devel/emscripten/distinfo

+TIMESTAMP = 1557349627
+SHA256 (emscripten-core-emscripten-1.38.31_GH0.tar.gz) = c87e42cb6a104094e7daf2b7e61ac835f83674ac0168f533455838a1129cc764
+SIZE (emscripten-core-emscripten-1.38.31_GH0.tar.gz) = 41822751

devel/emscripten/files/patch-tools_settings__template__readonly.py

+--- tools/settings_template_readonly.py.orig	2019-05-09 05:05:10 UTC
++++ tools/settings_template_readonly.py
+@@ -17,6 +17,10 @@ EMSCRIPTEN_ROOT = os.path.expanduser(os.
+ LLVM_ROOT = os.path.expanduser(os.getenv('LLVM', '{{{ LLVM_ROOT }}}')) # directory
+ BINARYEN_ROOT = os.path.expanduser(os.getenv('BINARYEN', '')) # if not set, we will use it from ports
+ 
++# based on https://github.com/emscripten-core/emscripten/issues/8564#issuecomment-490682686
++LLVM_ADD_VERSION = 'devel'
++CLANG_ADD_VERSION = 'devel'
++
+ # If not specified, defaults to sys.executable.
+ # PYTHON = 'python'
+ 

devel/emscripten/pkg-descr

+Emscripten is a toolchain for compiling to asm.js and WebAssembly, built using
+LLVM, that lets you run C and C++ on the web at near-native speed without
+plugins.
+
+WWW: https://emscripten.org/