luajit: ignore extra version info in jit.version (#1519)

Ignore any extra version info in jit.version when separated by a space.

A normal LuaJIT jit.version string looks like "LuaJIT 2.1.0-beta3".
Since official LuaJIT releases have all but stopped, various forks
continue to use the same version for all forks.

This change allows forks and patched rebuilds to add additional version
information at the end of the string without breaking luarocks version
detection, e.g. "LuaJIT 2.1.0-beta3 some-extra-version-info".

1 files changed, 2 insertions, 1 deletions

diff --git a/src/luarocks/util.lua b/src/luarocks/util.lua
index fa3a628e..dd05b4ac 100644
--- a/src/luarocks/util.lua
+++ b/src/luarocks/util.lua
@@ -457,7 +457,8 @@ do
 
       local ljv
       if cfg.lua_version == "5.1" then
-         ljv = util.popen_read(Q(cfg.variables["LUA_BINDIR"] .. "/" .. cfg.lua_interpreter) .. ' -e "io.write(tostring(jit and jit.version:gsub([[^%S+ ]], [[]])))"')
+         -- Ignores extra version info for custom builds, e.g. "LuaJIT 2.1.0-beta3 some-other-version-info"  
+         ljv = util.popen_read(Q(cfg.variables["LUA_BINDIR"] .. "/" .. cfg.lua_interpreter) .. ' -e "io.write(tostring(jit and jit.version:gsub([[^%S+ (%S+).*]], [[%1]])))"')
          if ljv == "nil" then
             ljv = nil
          end