add cross compile scripts and config

Author: barelyhuman

cross-compile.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euxo pipefail
+
+build_commands=('
+    choosenim stable \
+    ; nim c -d:release -o:bin/linux-amd64/nimclog src/nimclog.nim \
+    ; nim c -d:release --cpu:arm64 --os:linux -o:bin/linux-arm64/nimclog src/nimclog.nim \
+    ; nim c -d:release --os:macosx --cpu:amd64 -o:bin/darwin-amd64/nimclog src/nimclog.nim \
+    ; nim c -d:release -d:mingw --cpu:i386 -o:bin/windows-386/nimclog.exe src/nimclog.nim \
+    ; nim c -d:release -d:mingw --cpu:amd64 -o:bin/windows-amd64/nimclog.exe src/nimclog.nim
+')
+
+docker run -it --rm -v `pwd`:/usr/local/src \
+   chrishellerappsian/docker-nim-cross:latest \
+   /bin/bash -c "choosenim stable; $build_commands"

src/nimclog.nim.cfg

@@ -0,0 +1,36 @@
+# mingw
+amd64.windows.gcc.path = "/usr/bin/"
+amd64.windows.gcc.exe = "x86_64-w64-mingw32-gcc"
+amd64.windows.gcc.cpp.exe = "x86_64-w64-mingw32-g++"
+amd64.windows.gcc.linkerexe = "x86_64-w64-mingw32-gcc"
+# non-zero length string to override default -ldl
+amd64.windows.gcc.options.linker = " "
+
+i386.windows.gcc.path = "/usr/bin/"
+i386.windows.gcc.exe = "i686-w64-mingw32-gcc"
+i386.windows.gcc.cpp.exe = "i686-w64-mingw32-g++"
+i386.windows.gcc.linkerexe = "i686-w64-mingw32-gcc"
+# non-zero length string to override default -ldl
+i386.windows.gcc.options.linker = " "
+
+# macos
+amd64.macosx.clang.path = "/opt/osxcross/target/bin/"
+amd64.macosx.clang.exe = "o64-clang"
+amd64.macosx.clang.linkerexe = "o64-clang"
+
+i386.macosx.clang.path = "/opt/osxcross/target/bin/"
+i386.macosx.clang.exe = "o32-clang"
+i386.macosx.clang.linkerexe = "o32-clang"
+
+# linux (32 bit)
+@if unix and i386:
+  passC = "-m32"
+  passL = "-m32"
+@end
+
+# linux (musl)
+@if musl:
+  passL = "-static"
+  gcc.exe = "/usr/bin/musl-gcc"
+  gcc.linkerexe = "/usr/bin/musl-gcc"
+@end