neovim/cmake/LuaHelpers.cmake

#
# Functions to help checking for a Lua interpreter
#

# Check if a module is available in Lua
function(check_lua_module LUA_PRG_PATH MODULE RESULT_VAR)
  execute_process(COMMAND ${LUA_PRG_PATH} -l "${MODULE}" -e ""
    RESULT_VARIABLE module_missing)
  if(module_missing)
    set(${RESULT_VAR} False PARENT_SCOPE)
  else()
    set(${RESULT_VAR} True PARENT_SCOPE)
  endif()
endfunction()
Refactor the lua dependency checking. This is in preparation for the next step, which is to find a suitable lua interpreter, rather than just erroring when an interpreter is found but doesn't have the necessary dependencies. Helped-by: John Szakmeister <john@szakmeister.net> 2014-07-11 04:12:10 -07:00			`#`
			`# Functions to help checking for a Lua interpreter`
			`#`

			`# Check if a module is available in Lua`
			`function(check_lua_module LUA_PRG_PATH MODULE RESULT_VAR)`
cmake/LuaHelpers.cmake: check_lua_module: use 'lua -l' It only shortens the traceback a bit for when a module is not found though, only removing the "(command line):1: in main chunk" (with lua5.2). 2018-02-21 17:22:26 -07:00			`execute_process(COMMAND ${LUA_PRG_PATH} -l "${MODULE}" -e ""`
cmake/LuaHelpers.cmake: check_lua_module: display errors This helps to figure out what the problem is, e.g. in my case I have lua51-mpack installed to be used with luajit, but it is broken (missing libmpack). With this patch you get: -- Checking Lua interpreter /usr/bin/luajit /usr/bin/luajit: error loading module 'mpack' from file '/usr/lib/lua/5.1/mpack.so': libmpack.so.0: cannot open shared object file: No such file or directory stack traceback: [C]: at 0x55fcf0166fb0 [C]: in function 'require' (command line):1: in main chunk [C]: at 0x55fcf01188a0 -- [/usr/bin/luajit] The 'mpack' lua package is required for building Neovim -- Checking Lua interpreter /usr/bin/lua5.1 /usr/bin/lua5.1: error loading module 'mpack' from file '/usr/lib/lua/5.1/mpack.so': libmpack.so.0: cannot open shared object file: No such file or directory stack traceback: [C]: ? [C]: in function 'require' (command line):1: in main chunk [C]: ? -- [/usr/bin/lua5.1] The 'mpack' lua package is required for building Neovim -- Checking Lua interpreter /usr/bin/lua5.2 /usr/bin/lua5.2: (command line):1: module 'mpack' not found: no field package.preload['mpack'] no file '/usr/share/lua/5.2/mpack.lua' no file '/usr/share/lua/5.2/mpack/init.lua' no file '/usr/lib/lua/5.2/mpack.lua' no file '/usr/lib/lua/5.2/mpack/init.lua' no file './mpack.lua' no file '/usr/lib/lua/5.2/mpack.so' no file '/usr/lib/lua/5.2/loadall.so' no file './mpack.so' stack traceback: [C]: in function 'require' (command line):1: in main chunk [C]: in ? -- [/usr/bin/lua5.2] The 'mpack' lua package is required for building Neovim -- Checking Lua interpreter /usr/bin/lua /usr/bin/lua: (command line):1: module 'mpack' not found: no field package.preload['mpack'] no file '/usr/share/lua/5.3/mpack.lua' no file '/usr/share/lua/5.3/mpack/init.lua' no file '/usr/lib/lua/5.3/mpack.lua' no file '/usr/lib/lua/5.3/mpack/init.lua' no file './mpack.lua' no file './mpack/init.lua' no file '/usr/lib/lua/5.3/mpack.so' no file '/usr/lib/lua/5.3/loadall.so' no file './mpack.so' stack traceback: [C]: in function 'require' (command line):1: in main chunk [C]: in ? -- [/usr/bin/lua] The 'mpack' lua package is required for building Neovim CMake Error at CMakeLists.txt:459 (message): A suitable Lua interpreter was not found. While this makes it more verbose for the expected error case ("module 'mpack' not found"), the behavior before this patch hides too much. This is the old output: -- Checking Lua interpreter /usr/bin/luajit -- [/usr/bin/luajit] The 'mpack' lua package is required for building Neovim -- Checking Lua interpreter /usr/bin/lua5.1 -- [/usr/bin/lua5.1] The 'mpack' lua package is required for building Neovim -- Checking Lua interpreter /usr/bin/lua5.2 -- [/usr/bin/lua5.2] The 'mpack' lua package is required for building Neovim -- Checking Lua interpreter /usr/bin/lua -- [/usr/bin/lua] The 'mpack' lua package is required for building Neovim CMake Error at CMakeLists.txt:459 (message): A suitable Lua interpreter was not found. This is for when the whole configuration runs (i.e. after `make distclean`), afterwards only one Lua interpreter gets checked only. 2018-02-21 17:22:19 -07:00			`RESULT_VARIABLE module_missing)`
Refactor the lua dependency checking. This is in preparation for the next step, which is to find a suitable lua interpreter, rather than just erroring when an interpreter is found but doesn't have the necessary dependencies. Helped-by: John Szakmeister <john@szakmeister.net> 2014-07-11 04:12:10 -07:00			`if(module_missing)`
			`set(${RESULT_VAR} False PARENT_SCOPE)`
			`else()`
			`set(${RESULT_VAR} True PARENT_SCOPE)`
			`endif()`
			`endfunction()`