cmake backend: Generate 64 bits build when appropiate

Adds -DCMAKE_GENERATOR_PLATFORM=x64 when needed. It seems that
CMake does not do that by default (although I might be wrong on that).

fixes #382

1 files changed, 5 insertions, 1 deletions

diff --git a/src/luarocks/build/cmake.lua b/src/luarocks/build/cmake.lua
index c8f5a669..a1c08dfa 100644
--- a/src/luarocks/build/cmake.lua
+++ b/src/luarocks/build/cmake.lua
@@ -35,7 +35,6 @@ function cmake.run(rockspec)
       cmake_handler:close()
    end
 
-
    -- Execute cmake with variables.
    local args = ""
    if cfg.cmake_generator then
@@ -45,6 +44,11 @@ function cmake.run(rockspec)
       args = args .. ' -D' ..k.. '="' ..v.. '"'
    end
 
+   -- Generate 64 bit build if appropiate.
+   if not not cfg.arch:match("%-x86_64$") then
+      args = args .. " -DCMAKE_GENERATOR_PLATFORM=x64"
+   end
+
    if not fs.execute_string(rockspec.variables.CMAKE.." -H. -Bbuild.luarocks "..args) then
       return nil, "Failed cmake."
    end