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Fix the Meson CMake target for includedir or datadir outside the prefix

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nlohmann_jsonTargets.cmake always prepended the prefix computed from the
file's location to includedir. With an absolute includedir outside the
prefix (as Nix passes for packages with a separate dev output), this gave
"<prefix>//abs/include"; with an absolute datadir outside the prefix, the
number of ".." was derived from the absolute path and the prefix resolved
to "/". In both cases find_package(nlohmann_json) failed with "Imported
target includes non-existent path". Use the absolute include directory in
these cases, as CMake's install(EXPORT) does, and check it in CI.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-27 18:23:27 +02:00
parent 471c7678cf
commit 9cbe62efb0
3 changed files with 24 additions and 7 deletions
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meson.build
+15 -5
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@@ -69,12 +69,22 @@ if not meson.is_subproject()
install_dir: get_option('datadir') / 'pkgconfig',
)
# CMake package config files, so that find_package(nlohmann_json) works
# CMake package config files, so that find_package(nlohmann_json) works. The
# include directory is given relative to the config files, so that the
# installation can be relocated. This is not possible if includedir or datadir
# is an absolute path outside the prefix (e.g., with the separate outputs of
# Nix); then the absolute include directory is used, as CMake does.
fs = import('fs')
cmake_install_dir = get_option('datadir') / 'cmake' / meson.project_name()
cmake_to_prefix = []
foreach component : cmake_install_dir.split('/')
cmake_to_prefix += '..'
endforeach
if fs.is_absolute(get_option('includedir')) or fs.is_absolute(cmake_install_dir)
cmake_include_dir = (get_option('prefix') / get_option('includedir')).replace('\\', '/')
else
foreach component : cmake_install_dir.split('/')
cmake_to_prefix += '..'
endforeach
cmake_include_dir = '${_IMPORT_PREFIX}/' + get_option('includedir')
endif
cmake_conf = configuration_data()
cmake_conf.set('PROJECT_NAME', meson.project_name())
@@ -82,7 +92,7 @@ if not meson.is_subproject()
cmake_conf.set('PROJECT_VERSION_MAJOR', meson.project_version().split('.')[0])
cmake_conf.set('NLOHMANN_JSON_TARGET_NAME', meson.project_name())
cmake_conf.set('NLOHMANN_JSON_TARGETS_EXPORT_NAME', meson.project_name() + 'Targets')
cmake_conf.set('NLOHMANN_JSON_INCLUDE_INSTALL_DIR', get_option('includedir'))
cmake_conf.set('NLOHMANN_JSON_INCLUDE_DIR', cmake_include_dir)
cmake_conf.set('NLOHMANN_JSON_CONFIG_TO_PREFIX', '/'.join(cmake_to_prefix))
cmake_conf.set('NLOHMANN_JSON_COMPILE_DEFINITIONS', ';'.join(json_defines))