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.
By default Neovim searched a Luajit instalation and linked against
the luajit library.
In practice Neovim only requires luajit to run the unit tests. All other
targets only require lua and the correct lua modules. This commit:
1. Remove the strict dependency on Luajit
2. Makes the unittest target depend on the lua 'ffi' module.
If the module is not available the target is not enabled
and a message is displayed.
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>
