On 12/12/13 2:13 PM, "Richard Shaw"
<[email protected]<mailto:[email protected]>> wrote:
Very interesting but not quite what I'm looking for, in this case the main
CMakeLists.txt does actually build a project, I just need it to build wxWidgets
first.
Well it's up to you but 'build X and then build Y' is the definition of how
using ExternalProject work.
What you describe doesn't seem like it would ever work, because the CMake
source code is evaluated at Configuration time, not compile time. How is
wxWidgets a target? Do you have an ADD_CUSTOM_TARGET command somewhere? You
might have had it accidentally work because of how variables persist between
make/configure runs in CMakeCache.txt, but I don't see how it could ever be
dependable or predictable.
if(BOOTSTRAP_WXWIDGETS AND NOT TARGET wxWidgets)
message("Build wxWidgets")
else()
message("Doing normal build")
endif()
The CMake code below would do what you want to do. It builds wxWindows, and
then builds your project.
project(TWOSTAGE)
include(ExternalProject)
if(NOT BUILD_MY_PROJECT) # starts out un-set/false at top level build dir
include(cmake/BuildWxWidgets.cmake)
# your project builds in a subdirectory of the top level build dir
ExternalProject_add(MyActualProject
DOWNLOAD_COMMAND ""
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}
BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/MyActualProject-build
CMAKE_ARGS
-DBUILD_MY_PROJECT:BOOL=TRUE
<all relevant cmake args, including where to find wxWindows
libs/include>
INSTALL_COMMAND "" # presumably you don't want to install immediately.
)
else()
<normal build stuff, depending on WxWidgets>
endif()
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