Bringing together two interesting technologies:<\/p>\n
is not possible currently, as of 21.12.2018.<\/p>\n
There is no (at least no easy) way to cross-compile Crystal applications for the Raspberry Pi and Alpine Linux, from, for instance, x86 platforms, as the necessary target arm-linux-musleabihf<\/font> is not supported yet.<\/strong><\/p>\n <\/p>\n Unfortunately it\u2019s not possible to compile crystal on Alpine\/ARM\/Raspberry using gcc or the like, as \u201cto compile Crystal you need Crystal\u201d \u2013 the compilation will fail:<\/p>\n pitest:\/usr\/local\/crystal\/crystal# make The idea is that you crosscompile crystal on another architecture, and then can use it to natively compile it.<\/p>\n Alpine Linux uses musl, an alternative libc.<\/p>\n To find out the name of the target (LLVM target triple), you can execute llvm-config on the target system, like this:<\/p>\n llvm-config –host-target<\/p>\n<\/blockquote>\n To be able to run this command on Alpine, you install two packages:<\/p>\n apk add llvm<\/p>\n apk add llvm-dev<\/p>\n<\/blockquote>\n When trying a target which Crystal does not support yet for crosscompilation, you will get this error message:<\/p>\n in \/usr\/share\/crystal\/src\/callstack.cr:3: while requiring “c\/dlfcn”: can’t find file ‘c\/dlfcn’<\/strong><\/p>\n<\/blockquote>\n These libraries are located here:<\/p>\n \/usr\/share\/crystal\/src\/lib_c<\/p>\n<\/blockquote>\n Crystal is supported on Alpine, on the aarch64 (ARM 64bit) and x86_64 platforms. (and x86 via portalier.com)<\/p>\n In general, crosscompiling with Crystal works like this:<\/p>\n crystal build –release –cross-compile –target “aarch64-linux-musl” src\/armtest.cr<\/p>\n<\/blockquote>\n it will give you a command line to execute on the target machine:<\/p>\n cc ‘armtest.o’ -o ‘armtest’ -rdynamic -lpcre -lgc -lpthread \/usr\/share\/crystal\/src\/ext\/libcrystal.a -levent -lrt -L\/usr\/lib -L\/usr\/local\/lib<\/p>\n<\/blockquote>\n Zusammenf\u00fchrung von zwei interessanten Technologien: Alpine Linux - eine kleine und sicherheitsorientierte Linux-Distribution Crystal - eine kompilierte Sprache mit einer sch\u00f6nen Syntax (\u00e4hnlich Ruby) auf dem Raspberry Pi (armhf \/ ARMv6, die auch den Pi Zero W unterst\u00fctzen w\u00fcrde) ist derzeit nicht m\u00f6glich, Stand 21.12.2018. Es gibt keine (zumindest keine...<\/p>","protected":false},"author":830,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[401,416,400],"tags":[417,419,409,418,369],"class_list":["post-6264","post","type-post","status-publish","format-standard","hentry","category-alpine-linux","category-crystal-language","category-raspberry-pi-embedded-development","tag-alpine","tag-crosscompilation","tag-crystal","tag-musl","tag-raspberry"],"_links":{"self":[{"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/posts\/6264","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/users\/830"}],"replies":[{"embeddable":true,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/comments?post=6264"}],"version-history":[{"count":1,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/posts\/6264\/revisions"}],"predecessor-version":[{"id":6265,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/posts\/6264\/revisions\/6265"}],"wp:attachment":[{"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/media?parent=6264"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/categories?post=6264"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/tags?post=6264"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Misc background information<\/h3>\n
\n
\nUsing \/usr\/bin\/llvm-config [version=5.0.1]
\ng++ -c -o src\/llvm\/ext\/llvm_ext.o src\/llvm\/ext\/llvm_ext.cc -I\/usr\/lib\/llvm5\/include -Os -founused-parameter
-Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-fdata-sections -Os
-fomit-frame-pointer -Os -DNDEBUG -fno-exceptions -DLLVM_BUILD_GLOBAL_ISD__STDC_LIMIT_MACROS
\ncc -fPIC -c -o src\/ext\/sigfault.o src\/ext\/sigfault.c
\nar -rcs src\/ext\/libcrystal.a src\/ext\/sigfault.o
\nCRYSTAL_CONFIG_PATH=”\/usr\/local\/crystal\/crystal\/src” CRYSTAL_CONFIG_BUILD_COMMIT=”74c65ce6b” lib
\nYou need to have a crystal executable in your path!<\/strong>
\nmake: *** [Makefile:123: .build\/crystal] Error 1<\/p>\n<\/blockquote>\n\n
\n
\n
\n
\n
\n
<\/h3>\n
See these references:<\/h3>\n
\n