Fred Hornsey created XERCESC-2236:
-------------------------------------
Summary: Dependencies aren't loaded when using provided CMake
config package
Key: XERCESC-2236
URL: https://issues.apache.org/jira/browse/XERCESC-2236
Project: Xerces-C++
Issue Type: Bug
Components: Build
Affects Versions: 3.2.3
Environment: Ubuntu 18.04, CMake 3.22.2
Reporter: Fred Hornsey
We have a CMake config package for our libraries that first tries to load
Xerces support like so:
{code:java}
find_package(XercesC PATHS "${OPENDDS_XERCES3}" NO_DEFAULT_PATH)
if (NOT XercesC_FOUND)
find_package(XercesC)
endif(){code}
Where {{OPENDDS_XERCES3}} is the path to the Xerces our libraries were built
with. This works on Windows and Linux when using system-provided package. When
building and installing from source on Linux it seem this doesn't work. In this
case it's trying to use the CMake package provided by Xerces instead of the one
builtin to CMake.
I've created an example to demonstrate this. Xerces is built and installed to a
location on Linux using CMake. Then we create a {{{}CMakeLists.txt{}}}:
{code:java}
cmake_minimum_required(VERSION 3.12.0)
project(xerces_cmake_config_pkg_test)
find_package(XercesC PATHS "${THE_XERCES_ROOT}" NO_DEFAULT_PATH)
add_executable(testexe test.cpp)
target_link_libraries(testexe XercesC::XercesC)
{code}
{{test.cpp}} has to be created, but it doesn't matter what it contains because
CMake doesn't get far enough to allow us to attempt to build. When configuring,
setting {{THE_XERCES_ROOT}} to the installed Xerces, CMake gives these errors:
{code:java}
CMake Error at CMakeLists.txt:10 (add_executable):
Target "testexe" links to target "ICU::uc" but the target was not found.
Perhaps a find_package() call is missing for an IMPORTED target, or an
ALIAS target is missing?
CMake Error at CMakeLists.txt:10 (add_executable):
Target "testexe" links to target "ICU::data" but the target was not found.
Perhaps a find_package() call is missing for an IMPORTED target, or an
ALIAS target is missing?
CMake Error at CMakeLists.txt:10 (add_executable):
Target "testexe" links to target "Threads::Threads" but the target was not
found. Perhaps a find_package() call is missing for an IMPORTED target, or
an ALIAS target is missing? {code}
This seems to be caused by the packages used by Xerces during its configure
([like
ICU|https://github.com/apache/xerces-c/blob/045bdf8ac7755e1ce2735d5ef3f6741ec4718df9/src/CMakeLists.txt#L1113])
not being loaded for the Config package using {{find_package}} or equivalent.
[CMake
documenation|https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#creating-a-package-configuration-file]
suggests that this should be done in somewhere in the [config
file|https://github.com/apache/xerces-c/blob/master/src/xercesc/util/XercesVersion.hpp.in].
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