Hello,
I have scoured through this until I almost went blind.
https://cmake.org/cmake/help/latest/module/FetchContent.html
Have the following section in a cmake file because I need a much newer version of libtool libraries than Ubuntu 18.04 has.
if (CMAKE_SYSTEM_NAME MATCHES “(Linux|OpenBSD|FreeBSD|NetBSD|DragonFly)”)
# CMake is an odd duck. If you provide SOURCE_DIR definition for
# external project, PREFIX will not create the other directories.
# CMake ASS-U-ME-s all external projects are CMAKE builds. Not
# the case with libtool and so many other things.
#
# The hacky looking path for the configure command is a result of
# CMake forcing its own directory structure on external project.
#
include(ExternalProject)
include(FetchContent)
FetchContent_Populate(
ls_libtool
SUBBUILD_DIR "${CMAKE_BINARY_DIR}/ls_libtool"
URL https://ftp.gnu.org/gnu/libtool/libtool-2.5.4.tar.gz
DOWNLOAD_NO_PROGRESS ON
DOWNLOAD_EXTRACT_TIMESTAMP false
CONFIGURE_COMMAND ${CMAKE_BINARY_DIR}/ls_libtool/src/ls_libtool/configure --prefix=${LIBTOOL_INSTALL_PREFIX} "CFLAGS=-g -O0 ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE}}"
BUILD_COMMAND make
INSTALL_COMMAND make install
)
message( "*******ls_libtool_SOURCE_DIR: ${ls_libtool_SOURCE_DIR}")
message( "*******ls_libtool_BINARY_DIR: ${ls_libtool_BINARY_DIR}")
target_link_libraries(LsCsCore PUBLIC ${LIBTOOL_INSTALL_PREFIX}/lib/libltdl)
target_include_directories(LsCsCore
PUBLIC
$<BUILD_INTERFACE:${LIBTOOL_INSTALL_PREFIX}/include>
$<INSTALL_INTERFACE:include>)
endif()
Just to round out the environment
developer@developer-U1804-VirtualBox:~/github_projects/ls-cs$ cmake --version
cmake version 4.2.3
CMake suite maintained and supported by Kitware (kitware.com/cmake).
When this executes (for lack of a better term) I get the following:
– Build files have been written to: /home/developer/github_projects/LsCs_local_build/ls_libtool
[1/9] Creating directories for ‘ls_libtool-populate’
[1/9] Performing download step (download, verify and extract) for ‘ls_libtool-populate’
– Downloading…
dst=‘/home/developer/github_projects/LsCs_local_build/ls_libtool/ls_libtool-populate-prefix/src/libtool-2.5.4.tar.gz’
timeout=‘none’
inactivity timeout=‘none’
– Using src=‘https://ftp.gnu.org/gnu/libtool/libtool-2.5.4.tar.gz’
– Downloading… done
– extracting…
src=‘/home/developer/github_projects/LsCs_local_build/ls_libtool/ls_libtool-populate-prefix/src/libtool-2.5.4.tar.gz’
dst=‘/home/developer/github_projects/LsCs_local_build/src/core/ls_libtool-src’
– extracting… [tar xf]
– extracting… [analysis]
– extracting… [rename]
– extracting… [clean up]
– extracting… done
[2/9] No update step for ‘ls_libtool-populate’
[3/9] No patch step for ‘ls_libtool-populate’
[5/9] No configure step for ‘ls_libtool-populate’
[6/9] No build step for ‘ls_libtool-populate’
[7/9] No install step for ‘ls_libtool-populate’
[8/9] No test step for ‘ls_libtool-populate’
[9/9] Completed ‘ls_libtool-populate’
*******ls_libtool_SOURCE_DIR: /home/developer/github_projects/LsCs_local_build/src/core/ls_libtool-src
*******ls_libtool_BINARY_DIR: /home/developer/github_projects/LsCs_local_build/src/core/ls_libtool-build
Later on the build gags because
*** Building LSCS
ninja: error: ‘ls_libtool/install/lib/libltdl’, needed by ‘src/core/libLsCsCore.so.0.2.1’, missing and no known rule to make it
I put all of the information in that block required by externalproject to build and that will, you just cannot use the thing because the location of header files and built libraries does not exist during configuration.
All I want is for CMake to pull down this non-CMake project and build it so I can use the headers and libraries as part of my project. Bundling them up for deployment and all.
How do I make build and install steps for the populate? I cannot find anything on this.
Thanks in advance.