Add install

[01e9]

I can't use lest as cmake external project

# Here are registered all external projects
#
# Usage:
# add_dependencies(TARGET externalProjectName)
# target_link_libraries(TARGET PRIVATE ExternalLibraryName)

set(EXTERNAL_PROJECTS_PREFIX ${CMAKE_BINARY_DIR}/external-projects)
set(EXTERNAL_PROJECTS_INSTALL_PREFIX ${EXTERNAL_PROJECTS_PREFIX}/installed)

include(GNUInstallDirs)

# MUST be called before any add_executable() # https://stackoverflow.com/a/40554704/8766845
link_directories(${EXTERNAL_PROJECTS_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
include_directories($<BUILD_INTERFACE:${EXTERNAL_PROJECTS_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}>)

include(ExternalProject)

ExternalProject_Add(externalLest
    PREFIX "${EXTERNAL_PROJECTS_PREFIX}"
    GIT_REPOSITORY "https://github.com/martinmoene/lest.git"
    GIT_TAG "master"
    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTERNAL_PROJECTS_INSTALL_PREFIX}
    )

Build the externalLest target and you'll get error:

[ 75%] Performing install step for 'externalLest'
make[4]: *** No rule to make target 'install'.  Stop.

[01e9]

An example on how to achieve that https://github.com/jgaa/restc-cpp/pull/28

[martinmoene]

Thanks, will look into that.

[01e9]

Thanks! It works now

[martinmoene]

Thanks to you too!