Cmake/cpack: how to create a libc++ static library deb without headers? - cmake

Question

I have been trying to create a deb for LLVM libc++ 3.4 on a Ubuntu 12.04LTS 64bit box tonight. I would like to first create a deb that just consists of just /usr/lib64/libc++.a without any headers. Yes, I know per Debian library packaging guide, I should include the file in a *-dev package, But being new to cmake and cpack, I would like to get there incrementally.
So, I first changed the libcxx-3.4/lib/CMakeLists.txt and added an if check (see line 14 and 18)
$ cat CMakeLists.txt
1 if (NOT LIBCXX_INSTALL_SUPPORT_HEADERS)
2 set(LIBCXX_SUPPORT_HEADER_PATTERN PATTERN "support" EXCLUDE)
3 endif()
4
5 file(COPY .
6 DESTINATION "${CMAKE_BINARY_DIR}/include/c++/v1"
7 FILES_MATCHING
8 PATTERN "*"
9 PATTERN "CMakeLists.txt" EXCLUDE
10 PATTERN ".svn" EXCLUDE
11 ${LIBCXX_SUPPORT_HEADER_PATTERN}
12 )
13
14 if (${LIBCXX_ENABLE_SHARED} MATCHES "ON")
15 install(DIRECTORY "${CMAKE_BINARY_DIR}/include/c++/v1/"
16 DESTINATION include/c++/v1/
17 )
18 endif()
Then, at in the build subdirectory, I issued a
CC=clang CXX=clang++ cmake -j2 -G "Unix Makefiles" -DLIBCXX_CXX_ABI=libcxxabi -DLIBCXX_LIBCXXABI_INCLUDE_PATHS="../libcxxabi/include" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr ../libcxx -DLIBCXX_ENABLE_SHARED=OFF
The created deb still consists of all headers. If I commented out lines 14 to 18, then no headers were included in the package. I am puzzled by this. A variable defined for the parent CMakeLists.txt should be picked up by a child CMakeLists.txt. What did I miss? I would appreciate a hint or two.

Answer 1

I have figured out the answer for my own question. Being new to cmake and cpack, I initially focused on the wrong CMakeLists.txt. The install command for headers in the include/CMakeLists.txt is not the only one. The main CMakeLists.txt file has a marcro in which there is also an install command. That should be disabled too. Specifically:
In the main CMakeLists.txt, one could do:
129 message(STATUS "Inside of setup_abi_libs; LIBCXX_ENABLE_SHARED: ${LIBCXX_ENABLE_SHARED}")
130 if (LIBCXX_ENABLE_SHARED)
131 install(DIRECTORY "${CMAKE_BINARY_DIR}/include/"
132 DESTINATION include/c++/v1
133 FILES_MATCHING
134 PATTERN "*"
135 )
136 endif()
137 endmacro()
Then, in the include/CMakeLists.txt, one could do:
13
14 message(STATUS "Inside of include; LIBCXX_ENABLE_SHARED: ${LIBCXX_ENABLE_SHARED}")
15
16 if (LIBCXX_ENABLE_SHARED)
17 install(DIRECTORY "${CMAKE_BINARY_DIR}/include/c++/v1/"
18 DESTINATION include/c++/v1/
19 )
20 endif()
This is the end result that I was trying to obtain but failed last night:
$ dpkg-deb -c libcxx_3.4-1_amd64.deb
drwxrwxr-x root/root 0 2014-03-04 08:59 ./usr/
drwxrwxr-x root/root 0 2014-03-04 08:59 ./usr/lib64/
-rw-r--r-- root/root 1928770 2014-03-04 08:58 ./usr/lib64/libc++.a
No more headers. Now I just need to figure out how to change the original CMakeLists.txt files to make a real dev package :)

Answer 2

Please read documenation for if:
MATCHES is for regular expressions, use if (LIBCXX_ENABLE_SHARED) or if (${LIBCXX_ENABLE_SHARED} STREQUAL "ON") instead