revert: "ci: remove mingw job #18580"

This partially reverts commit f8af81445bb48966d54f4a956842d935d009d275.

The mingw parts of cmake was removed to see if it was still used
(ref: https://github.com/neovim/neovim/pull/18580). It turns out it is,
so this will fix that.

Closes: https://github.com/neovim/neovim/issues/18597

9 files changed, 124 insertions, 6 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 19c81ffcbe..409face71c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -108,7 +108,14 @@ endif()
 
 option(ENABLE_LIBINTL "enable libintl" ON)
 option(ENABLE_LIBICONV "enable libiconv" ON)
-option(ENABLE_LTO "enable link time optimization" ON)
+if (MINGW)
+  # Disable LTO by default as it may not compile
+  # See https://github.com/Alexpux/MINGW-packages/issues/3516
+  # and https://github.com/neovim/neovim/pull/8654#issuecomment-402316672
+  option(ENABLE_LTO "enable link time optimization" OFF)
+else()
+  option(ENABLE_LTO "enable link time optimization" ON)
+endif()
 
 message(STATUS "CMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}")
 
@@ -315,6 +322,10 @@ else()
   endif()
 endif()
 
+if(MINGW)
+  # Use POSIX compatible stdio in Mingw
+  add_definitions(-D__USE_MINGW_ANSI_STDIO)
+endif()
 if(WIN32)
   # Windows Vista is the minimum supported version
   add_definitions(-D_WIN32_WINNT=0x0600)
diff --git a/cmake/FindLuaJit.cmake b/cmake/FindLuaJit.cmake
index c904347f6a..72795afefd 100644
--- a/cmake/FindLuaJit.cmake
+++ b/cmake/FindLuaJit.cmake
@@ -17,6 +17,8 @@ find_path(LUAJIT_INCLUDE_DIR luajit.h
 
 if(MSVC)
   list(APPEND LUAJIT_NAMES lua51)
+elseif(MINGW)
+  list(APPEND LUAJIT_NAMES libluajit libluajit-5.1)
 else()
   list(APPEND LUAJIT_NAMES luajit-5.1)
 endif()
diff --git a/third-party/CMakeLists.txt b/third-party/CMakeLists.txt
index 36965a2e98..21d1f7906a 100644
--- a/third-party/CMakeLists.txt
+++ b/third-party/CMakeLists.txt
@@ -93,6 +93,15 @@ if(CMAKE_GENERATOR MATCHES "Makefiles")
   set(MAKE_PRG "$(MAKE)")
 endif()
 
+if(MINGW AND CMAKE_GENERATOR MATCHES "Ninja")
+  find_program(MAKE_PRG NAMES mingw32-make)
+  if(NOT MAKE_PRG)
+    message(FATAL_ERROR "GNU Make for mingw32 is required to build the dependencies.")
+  else()
+    message(STATUS "Found GNU Make for mingw32: ${MAKE_PRG}")
+  endif()
+endif()
+
 if(CMAKE_C_COMPILER_ARG1)
   set(DEPS_C_COMPILER "${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}")
 else()
diff --git a/third-party/cmake/BuildLibuv.cmake b/third-party/cmake/BuildLibuv.cmake
index 9d0707201f..42650308a8 100644
--- a/third-party/cmake/BuildLibuv.cmake
+++ b/third-party/cmake/BuildLibuv.cmake
@@ -45,11 +45,24 @@ if(UNIX)
     CONFIGURE_COMMAND ${UNIX_CFGCMD} MAKE=${MAKE_PRG}
     INSTALL_COMMAND ${MAKE_PRG} V=1 install)
 
+elseif(MINGW AND CMAKE_CROSSCOMPILING)
+  # Build libuv for the host
+  BuildLibuv(TARGET libuv_host
+    CONFIGURE_COMMAND sh ${DEPS_BUILD_DIR}/src/libuv_host/autogen.sh && ${DEPS_BUILD_DIR}/src/libuv_host/configure --with-pic --disable-shared --prefix=${HOSTDEPS_INSTALL_DIR} CC=${HOST_C_COMPILER}
+    INSTALL_COMMAND ${MAKE_PRG} V=1 install)
+
+  # Build libuv for the target
+  BuildLibuv(
+    CONFIGURE_COMMAND ${UNIX_CFGCMD} --host=${CROSS_TARGET}
+    INSTALL_COMMAND ${MAKE_PRG} V=1 install)
+
 elseif(WIN32)
 
   set(UV_OUTPUT_DIR ${DEPS_BUILD_DIR}/src/libuv/${CMAKE_BUILD_TYPE})
   if(MSVC)
     set(BUILD_SHARED ON)
+  elseif(MINGW)
+    set(BUILD_SHARED OFF)
   else()
     message(FATAL_ERROR "Trying to build libuv in an unsupported system ${CMAKE_SYSTEM_NAME}/${CMAKE_C_COMPILER_ID}")
   endif()
diff --git a/third-party/cmake/BuildLua.cmake b/third-party/cmake/BuildLua.cmake
index 02f762234b..a40cb7dcb2 100644
--- a/third-party/cmake/BuildLua.cmake
+++ b/third-party/cmake/BuildLua.cmake
@@ -39,6 +39,8 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
   set(LUA_TARGET freebsd)
 elseif(CMAKE_SYSTEM_NAME MATCHES "BSD")
   set(CMAKE_LUA_TARGET bsd)
+elseif(CMAKE_SYSTEM_NAME MATCHES "^MINGW")
+  set(CMAKE_LUA_TARGET mingw)
 else()
   if(UNIX)
     set(LUA_TARGET posix)
diff --git a/third-party/cmake/BuildLuajit.cmake b/third-party/cmake/BuildLuajit.cmake
index 9c0a6cfba2..e02d7fe609 100644
--- a/third-party/cmake/BuildLuajit.cmake
+++ b/third-party/cmake/BuildLuajit.cmake
@@ -76,6 +76,57 @@ if(UNIX)
     CC=${DEPS_C_COMPILER} PREFIX=${DEPS_INSTALL_DIR}
     ${DEPLOYMENT_TARGET})
 
+elseif(MINGW AND CMAKE_CROSSCOMPILING)
+
+  # Build luajit for the host
+  BuildLuaJit(TARGET luajit_host
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND ""
+    INSTALL_COMMAND ${INSTALLCMD_UNIX}
+      CC=${HOST_C_COMPILER} PREFIX=${HOSTDEPS_INSTALL_DIR})
+
+  # Build luajit for the target
+  BuildLuaJit(
+    # Similar to Unix + cross - fPIC
+    INSTALL_COMMAND
+      ${MAKE_PRG} PREFIX=${DEPS_INSTALL_DIR}
+        BUILDMODE=static install
+        TARGET_SYS=${CMAKE_SYSTEM_NAME}
+        CROSS=${CROSS_TARGET}-
+        HOST_CC=${HOST_C_COMPILER} HOST_CFLAGS=${HOST_C_FLAGS}
+        HOST_LDFLAGS=${HOST_EXE_LINKER_FLAGS}
+        FILE_T=luajit.exe
+        Q=
+        INSTALL_TSYMNAME=luajit.exe)
+
+elseif(MINGW)
+
+  if(CMAKE_GENERATOR MATCHES "Ninja")
+    set(LUAJIT_MAKE_PRG ${MAKE_PRG})
+  else()
+    set(LUAJIT_MAKE_PRG ${CMAKE_MAKE_PROGRAM})
+  endif()
+  BuildLuaJit(BUILD_COMMAND ${LUAJIT_MAKE_PRG} CC=${DEPS_C_COMPILER}
+                                PREFIX=${DEPS_INSTALL_DIR}
+                                CFLAGS+=-DLUA_USE_APICHECK
+                                CFLAGS+=-funwind-tables
+                                CCDEBUG+=-g
+                                BUILDMODE=static
+                      # Build a DLL too
+                      COMMAND ${LUAJIT_MAKE_PRG} CC=${DEPS_C_COMPILER} BUILDMODE=dynamic
+
+          INSTALL_COMMAND ${CMAKE_COMMAND} -E make_directory ${DEPS_INSTALL_DIR}/bin
+	    COMMAND ${CMAKE_COMMAND} -E copy ${DEPS_BUILD_DIR}/src/luajit/src/luajit.exe ${DEPS_INSTALL_DIR}/bin
+	    COMMAND ${CMAKE_COMMAND} -E copy ${DEPS_BUILD_DIR}/src/luajit/src/lua51.dll ${DEPS_INSTALL_DIR}/bin
+	    COMMAND ${CMAKE_COMMAND} -E make_directory ${DEPS_INSTALL_DIR}/lib
+	    # Luarocks searches for lua51.dll in lib
+	    COMMAND ${CMAKE_COMMAND} -E copy ${DEPS_BUILD_DIR}/src/luajit/src/lua51.dll ${DEPS_INSTALL_DIR}/lib
+	    COMMAND ${CMAKE_COMMAND} -E copy ${DEPS_BUILD_DIR}/src/luajit/src/libluajit.a ${DEPS_INSTALL_DIR}/lib
+	    COMMAND ${CMAKE_COMMAND} -E make_directory ${DEPS_INSTALL_DIR}/include/luajit-2.1
+	    COMMAND ${CMAKE_COMMAND} -DFROM_GLOB=${DEPS_BUILD_DIR}/src/luajit/src/*.h -DTO=${DEPS_INSTALL_DIR}/include/luajit-2.1 -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/CopyFilesGlob.cmake
+	    COMMAND ${CMAKE_COMMAND} -E make_directory ${DEPS_INSTALL_DIR}/bin/lua/jit
+	    COMMAND ${CMAKE_COMMAND} -E copy_directory ${DEPS_BUILD_DIR}/src/luajit/src/jit ${DEPS_INSTALL_DIR}/bin/lua/jit
+	    )
 elseif(MSVC)
 
   BuildLuaJit(
diff --git a/third-party/cmake/BuildLuarocks.cmake b/third-party/cmake/BuildLuarocks.cmake
index 98783d533e..244d1d9fb8 100644
--- a/third-party/cmake/BuildLuarocks.cmake
+++ b/third-party/cmake/BuildLuarocks.cmake
@@ -56,7 +56,7 @@ endif()
 # Defaults to 5.1 for bundled LuaJIT/Lua.
 set(LUA_VERSION "5.1")
 
-if(UNIX)
+if(UNIX OR (MINGW AND CMAKE_CROSSCOMPILING))
 
   if(USE_BUNDLED_LUAJIT)
     list(APPEND LUAROCKS_OPTS
@@ -94,9 +94,13 @@ if(UNIX)
     CONFIGURE_COMMAND ${DEPS_BUILD_DIR}/src/luarocks/configure
       --prefix=${HOSTDEPS_INSTALL_DIR} --force-config ${LUAROCKS_OPTS}
     INSTALL_COMMAND ${MAKE_PRG} -j1 bootstrap)
-elseif(MSVC)
+elseif(MSVC OR MINGW)
 
-  set(COMPILER_FLAG /MSVC)
+  if(MINGW)
+    set(COMPILER_FLAG /MW)
+  elseif(MSVC)
+    set(COMPILER_FLAG /MSVC)
+  endif()
 
   # Ignore USE_BUNDLED_LUAJIT - always ON for native Win32
   BuildLuarocks(INSTALL_COMMAND install.bat /FORCECONFIG /NOREG /NOADMIN /Q /F
@@ -119,6 +123,9 @@ list(APPEND THIRD_PARTY_DEPS luarocks)
 
 if(USE_BUNDLED_LUAJIT)
   add_dependencies(luarocks luajit)
+  if(MINGW AND CMAKE_CROSSCOMPILING)
+    add_dependencies(luarocks luajit_host)
+  endif()
 elseif(USE_BUNDLED_LUA)
   add_dependencies(luarocks lua)
 endif()
@@ -189,6 +196,9 @@ if(USE_BUNDLED_BUSTED)
   set(LUV_DEPS luacheck)
   if(USE_BUNDLED_LUV)
     list(APPEND LUV_DEPS luv-static lua-compat-5.3)
+    if(MINGW AND CMAKE_CROSSCOMPILING)
+      list(APPEND LUV_DEPS libuv_host)
+    endif()
     set(LUV_ARGS "CFLAGS=-O0 -g3 -fPIC")
     if(USE_BUNDLED_LIBUV)
       list(APPEND LUV_ARGS LIBUV_DIR=${HOSTDEPS_INSTALL_DIR})
diff --git a/third-party/cmake/BuildLuv.cmake b/third-party/cmake/BuildLuv.cmake
index 001f5a325a..99822249c2 100644
--- a/third-party/cmake/BuildLuv.cmake
+++ b/third-party/cmake/BuildLuv.cmake
@@ -91,7 +91,16 @@ if(USE_BUNDLED_LIBUV)
     -DCMAKE_PREFIX_PATH=${DEPS_INSTALL_DIR})
 endif()
 
-if(MSVC)
+if(MINGW AND CMAKE_CROSSCOMPILING)
+  get_filename_component(TOOLCHAIN ${CMAKE_TOOLCHAIN_FILE} REALPATH)
+  set(LUV_CONFIGURE_COMMAND
+    ${LUV_CONFIGURE_COMMAND_COMMON}
+    # Pass toolchain
+    -DCMAKE_TOOLCHAIN_FILE=${TOOLCHAIN}
+    "-DCMAKE_C_FLAGS:STRING=${LUV_INCLUDE_FLAGS} -D_WIN32_WINNT=0x0600"
+    # Hack to avoid -rdynamic in Mingw
+    -DCMAKE_SHARED_LIBRARY_LINK_C_FLAGS="")
+elseif(MSVC)
   set(LUV_CONFIGURE_COMMAND
     ${LUV_CONFIGURE_COMMAND_COMMON}
     -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
diff --git a/third-party/cmake/BuildMsgpack.cmake b/third-party/cmake/BuildMsgpack.cmake
index a89c1e34d0..f66a3bdd32 100644
--- a/third-party/cmake/BuildMsgpack.cmake
+++ b/third-party/cmake/BuildMsgpack.cmake
@@ -42,7 +42,18 @@ set(MSGPACK_CONFIGURE_COMMAND ${CMAKE_COMMAND} ${DEPS_BUILD_DIR}/src/msgpack
 set(MSGPACK_BUILD_COMMAND ${CMAKE_COMMAND} --build . --config ${CMAKE_BUILD_TYPE})
 set(MSGPACK_INSTALL_COMMAND ${CMAKE_COMMAND} --build . --target install --config ${CMAKE_BUILD_TYPE})
 
-if(MSVC)
+if(MINGW AND CMAKE_CROSSCOMPILING)
+  get_filename_component(TOOLCHAIN ${CMAKE_TOOLCHAIN_FILE} REALPATH)
+  set(MSGPACK_CONFIGURE_COMMAND ${CMAKE_COMMAND} ${DEPS_BUILD_DIR}/src/msgpack
+    -DMSGPACK_BUILD_TESTS=OFF
+    -DMSGPACK_BUILD_EXAMPLES=OFF
+    -DCMAKE_INSTALL_PREFIX=${DEPS_INSTALL_DIR}
+    # Pass toolchain
+    -DCMAKE_TOOLCHAIN_FILE=${TOOLCHAIN}
+    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+    # Hack to avoid -rdynamic in Mingw
+    -DCMAKE_SHARED_LIBRARY_LINK_C_FLAGS="")
+elseif(MSVC)
   # Same as Unix without fPIC
   set(MSGPACK_CONFIGURE_COMMAND ${CMAKE_COMMAND} ${DEPS_BUILD_DIR}/src/msgpack
     -DMSGPACK_BUILD_TESTS=OFF