feat: first-class musl support

.cross_rubies

@@ -1,32 +1,48 @@
-3.0.0:aarch64-linux
-3.0.0:arm-linux
+3.0.0:aarch64-linux-gnu
+3.0.0:aarch64-linux-musl
+3.0.0:arm-linux-gnu
+3.0.0:arm-linux-musl
 3.0.0:arm64-darwin
 3.0.0:x64-mingw32
-3.0.0:x86-linux
+3.0.0:x86-linux-gnu
+3.0.0:x86-linux-musl
 3.0.0:x86-mingw32
 3.0.0:x86_64-darwin
-3.0.0:x86_64-linux
-3.1.0:aarch64-linux
-3.1.0:arm-linux
+3.0.0:x86_64-linux-gnu
+3.0.0:x86_64-linux-musl
+3.1.0:aarch64-linux-gnu
+3.1.0:aarch64-linux-musl
+3.1.0:arm-linux-gnu
+3.1.0:arm-linux-musl
 3.1.0:arm64-darwin
 3.1.0:x64-mingw-ucrt
-3.1.0:x86-linux
+3.1.0:x86-linux-gnu
+3.1.0:x86-linux-musl
 3.1.0:x86-mingw32
 3.1.0:x86_64-darwin
-3.1.0:x86_64-linux
-3.2.0:aarch64-linux
-3.2.0:arm-linux
+3.1.0:x86_64-linux-gnu
+3.1.0:x86_64-linux-musl
+3.2.0:aarch64-linux-gnu
+3.2.0:aarch64-linux-musl
+3.2.0:arm-linux-gnu
+3.2.0:arm-linux-musl
 3.2.0:arm64-darwin
 3.2.0:x64-mingw-ucrt
-3.2.0:x86-linux
+3.2.0:x86-linux-gnu
+3.2.0:x86-linux-musl
 3.2.0:x86-mingw32
 3.2.0:x86_64-darwin
-3.2.0:x86_64-linux
-3.3.0:aarch64-linux
-3.3.0:arm-linux
+3.2.0:x86_64-linux-gnu
+3.2.0:x86_64-linux-musl
+3.3.0:aarch64-linux-gnu
+3.3.0:aarch64-linux-musl
+3.3.0:arm-linux-gnu
+3.3.0:arm-linux-musl
 3.3.0:arm64-darwin
 3.3.0:x64-mingw-ucrt
-3.3.0:x86-linux
+3.3.0:x86-linux-gnu
+3.3.0:x86-linux-musl
 3.3.0:x86-mingw32
 3.3.0:x86_64-darwin
-3.3.0:x86_64-linux
+3.3.0:x86_64-linux-gnu
+3.3.0:x86_64-linux-musl

Gemfile

@@ -17,7 +17,7 @@ group :development do
 
   # building extensions
   gem "rake-compiler", "1.2.5"
-  gem "rake-compiler-dock", "1.4.0"
+  gem "rake-compiler-dock", "1.5.0.rc1"
 
   # parser generator
   gem "rexical", "= 1.0.7"

rakelib/extensions.rake

@@ -8,7 +8,8 @@ CrossRuby = Struct.new(:version, :platform) do
   MINGWUCRT_PLATFORM_REGEX = /mingw-ucrt/
   MINGW32_PLATFORM_REGEX = /mingw32/
   LINUX_PLATFORM_REGEX = /linux/
-  X86_LINUX_PLATFORM_REGEX = /x86.*linux/
+  X86_LINUX_GNU_PLATFORM_REGEX = /x86.*linux-gnu$/
+  X86_LINUX_MUSL_PLATFORM_REGEX = /x86.*linux-musl$/
   AARCH_LINUX_PLATFORM_REGEX = /aarch.*linux/
   ARM_LINUX_PLATFORM_REGEX = /arm-linux/
   DARWIN_PLATFORM_REGEX = /darwin/
@@ -42,70 +43,35 @@ CrossRuby = Struct.new(:version, :platform) do
     end
   end
 
-  def host
-    @host ||= case platform
-    when "x64-mingw-ucrt"
-      "x86_64-w64-mingw32"
-    when "x64-mingw32"
-      "x86_64-w64-mingw32"
-    when "x86-mingw32"
-      "i686-w64-mingw32"
-    when "x86_64-linux"
-      "x86_64-linux-gnu"
-    when "x86-linux"
-      "i686-linux-gnu"
-    when "aarch64-linux"
-      "aarch64-linux"
-    when "x86_64-darwin"
-      "x86_64-darwin"
-    when "arm64-darwin"
-      "aarch64-darwin"
-    else
-      raise "CrossRuby.platform: unsupported platform: #{platform}"
-    end
-  end
-
   def tool(name)
     (@binutils_prefix ||= case platform
-     when "x64-mingw-ucrt", "x64-mingw32"
-       "x86_64-w64-mingw32-"
-     when "x86-mingw32"
-       "i686-w64-mingw32-"
-     when "x86_64-linux"
-       "x86_64-redhat-linux-"
-     when "x86-linux"
-       "i686-redhat-linux-"
-     when "aarch64-linux"
-       "aarch64-linux-gnu-"
-     when "x86_64-darwin"
-       "x86_64-apple-darwin-"
-     when "arm64-darwin"
-       "aarch64-apple-darwin-"
-     when "arm-linux"
-       "arm-linux-gnueabihf-"
+     when "aarch64-linux-gnu" then "aarch64-linux-gnu-"
+     when "aarch64-linux-musl" then "aarch64-linux-musl-"
+     when "arm-linux-gnu" then "arm-linux-gnueabihf-"
+     when "arm-linux-musl" then "arm-linux-musleabihf-"
+     when "arm64-darwin" then "aarch64-apple-darwin-"
+     when "x64-mingw-ucrt", "x64-mingw32" then "x86_64-w64-mingw32-"
+     when "x86-linux-gnu" then "i686-redhat-linux-gnu-"
+     when "x86-linux-musl" then "i686-unknown-linux-musl-"
+     when "x86-mingw32" then "i686-w64-mingw32-"
+     when "x86_64-darwin" then "x86_64-apple-darwin-"
+     when "x86_64-linux-gnu" then "x86_64-redhat-linux-gnu-"
+     when "x86_64-linux-musl" then "x86_64-unknown-linux-musl-"
      else
        raise "CrossRuby.tool: unmatched platform: #{platform}"
      end) + name
   end
 
   def target_file_format
     case platform
-    when "x64-mingw-ucrt", "x64-mingw32"
-      "pei-x86-64"
-    when "x86-mingw32"
-      "pei-i386"
-    when "x86_64-linux"
-      "elf64-x86-64"
-    when "x86-linux"
-      "elf32-i386"
-    when "aarch64-linux"
-      "elf64-littleaarch64"
-    when "x86_64-darwin"
-      "Mach-O 64-bit x86-64" # hmm
-    when "arm64-darwin"
-      "Mach-O arm64"
-    when "arm-linux"
-      "elf32-littlearm"
+    when "aarch64-linux-gnu", "aarch64-linux-musl" then "elf64-littleaarch64"
+    when "arm-linux-gnu", "arm-linux-musl" then "elf32-littlearm"
+    when "arm64-darwin" then "Mach-O arm64"
+    when "x64-mingw-ucrt", "x64-mingw32" then "pei-x86-64"
+    when "x86-linux-gnu", "x86-linux-musl" then "elf32-i386"
+    when "x86-mingw32" then "pei-i386"
+    when "x86_64-darwin" then "Mach-O 64-bit x86-64" # hmm
+    when "x86_64-linux-gnu", "x86_64-linux-musl" then "elf64-x86-64"
     else
       raise "CrossRuby.target_file_format: unmatched platform: #{platform}"
     end
@@ -162,14 +128,18 @@ CrossRuby = Struct.new(:version, :platform) do
         "api-ms-win-crt-utility-l1-1-0.dll",
         libruby_dll,
       ]
-    when X86_LINUX_PLATFORM_REGEX
+    when X86_LINUX_GNU_PLATFORM_REGEX
       [
         "libm.so.6",
         "libc.so.6",
         "libdl.so.2", # on old dists only - now in libc
       ].tap do |dlls|
         dlls << "libpthread.so.0" if ver >= "3.2.0"
       end
+    when X86_LINUX_MUSL_PLATFORM_REGEX
+      [
+        "libc.so",
+      ]
     when AARCH_LINUX_PLATFORM_REGEX
       [
         "libm.so.6",
@@ -201,10 +171,12 @@ CrossRuby = Struct.new(:version, :platform) do
 
   def dll_ref_versions
     case platform
-    when X86_LINUX_PLATFORM_REGEX
+    when X86_LINUX_GNU_PLATFORM_REGEX
       { "GLIBC" => "2.17" }
     when AARCH_LINUX_PLATFORM_REGEX, ARM_LINUX_PLATFORM_REGEX
       { "GLIBC" => "2.29" }
+    when X86_LINUX_MUSL_PLATFORM_REGEX
+      {}
     else
       raise "CrossRuby.dll_ref_versions: unmatched platform: #{platform}"
     end