Gentoo incompatible Cmake

[archenroot]

Hi, I am working on Torch ebuild files for Gentoo. In case of openCV I have little issue with the way how CMakeLists.txt file is prepared as it end up by installing libraries (.so) and lua files (.lua) into same folders. But probably not only Gentoo, but other distributions are using usually different folders for libs and lua files.

In my case Gentoo expects following:

• so files should usually go into /usr/lib(64)/lua/5.1 directory
• lua files should usually go into /usr/share/lua/5.1 directory

I don't have such problem with other Torch packages, i will customize current CMakeFiles.txt and try to make it more compatible with other torch packages.

In Gentoo ebuild system I of course have my own way how to handle this situation, but I think it is better to handle this directly here.

Any hints or counter-offers?

Ladislav

[archenroot]

Any hints on this? To be more precious, while building using CMAKE the libraries gets installed in /usr directory on Gentoo. I believe I am missing some variable, or the macros executed to find some dirs do not find it, any suggestion?

[shrubb]

Hi, sorry for delay.

That's strange because INSTALL command is issued "${Torch_INSTALL_LUA_PATH_SUBDIR}/cv".

@yangky11, can you give us a hint on this? I'm not sure what do these your lines tell luarocks to do:

IF(LUAROCKS_PREFIX)
    MESSAGE(STATUS "Installing Torch through Luarocks")
    STRING(REGEX REPLACE "(.*)lib/luarocks/rocks.*" "\\1" CMAKE_INSTALL_PREFIX  "${LUAROCKS_PREFIX}")
    MESSAGE(STATUS "Prefix inferred from Luarocks: ${CMAKE_INSTALL_PREFIX}")
ENDIF()

[archenroot]

I see, well I am producing Gentoo ebuilds for all other Torch packages and usually I am enough with following local variable sets to pass to CMAKE (the way how I obtain the values is experimental and not kosher yet from Gentoo perspective, but important are variables passed):

"-DCMAKE_BUILD_TYPE=Release"
"-DLUADIR=$($(tc-getPKG_CONFIG) --variable INSTALL_LMOD $(usex luajit 'luajit' 'lua'))"
"-DLIBDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_LIB $(usex luajit 'luajit' 'lua'))"
"-DLUA_BINDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))"
"-DLUA_INCDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_INC $(usex luajit 'luajit' 'lua'))"
"-DLUA_LIBDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_CMOD $(usex luajit 'luajit' 'lua'))"
"-DSCRIPTS_DIR=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))"
"-DLUALIB=`equery files luajit |grep lib64/libluajit | grep .so | awk 'NR==0; END{print}'`"
"-DLUA=/usr/bin/luajit"

There are also some others, but required only by specific Torch components to be passed for build:

"-DQT_INSTALL_LIBRARIES=ON"
"-DQtLua_INSTALL_INCLUDE=$($(tc-getPKG_CONFIG) --variable INSTALL_INC $(usex luajit 'luajit'  lua'))"
"-DQtLua_INSTALL_BIN_SUBDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))"
"-DQtLua_INSTALL_LIB=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))"
"-DQtLua_INSTALL_LIB_SUBDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_CMOD $(usex luajit 'luajit' 'lua'))"
"-DCONFDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_LMOD $(usex luajit 'luajit' 'lua'))/etc"

Olso note, I talked to Torch dev team and they also say that not all CMakeLists.txt files are in perfect condition, and I plan to go one by one and check them, so they follow the same layout for easy adoption. If all is ok, then the only work for me from Gentoo portage compatibility system is to use cmake eclasses available and do something like:

src_configure() {
	local mycmakeargs=(
		"-DLUADIR=$($(tc-getPKG_CONFIG) --variable INSTALL_LMOD $(usex luajit 'luajit' 'lua'))"
		"-DLIBDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_LIB $(usex luajit 'luajit' 'lua'))"
		"-DLUA_BINDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))"
		"-DLUA_INCDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_INC $(usex luajit 'luajit' 'lua'))"
		"-DLUA_LIBDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_CMOD $(usex luajit 'luajit' 'lua'))"
		"-DSCRIPTS_DIR=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))"
		"-DLUALIB=`equery files luajit |grep lib64/libluajit | grep .so | awk 'NR==0; END{print}'`"
		"-DLUA=/usr/bin/luajit"
		"-DCMAKE_BUILD_TYPE=Release"
		"-DCMAKE_PREFIX_PATH=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))/.."
		"-DCMAKE_INSTALL_PREFIX=/usr"
	)

	cmake-utils_src_configure
}

src_install() {
	cmake-utils_src_install
}

And it is end of story. Note I am not expert on CMAKE, but I am on learning kurve :-)

Thanks for suggestions.

Maybe I should manually set CMAKE_INSTALL_PREFIX and LUAROCKS_PREFIX, but note these are not common variables used on other Torch components. I am of course not saying it is wrong, I just wonder...