When building utfcpp (and other packages) a CMake warning is issued.
CMake Warning:
Manually-specified variables were not used by the project:
CMAKE_EXPORT_COMPILE_COMMANDS
Before this change the following files are present:
$ cd build.LibreELEC-Generic.x86_64-13.0-devel/build
$ find utfcpp-4.0.6 -name build.ninja
utfcpp-4.0.6/.x86_64-libreelec-linux-gnu/build.ninja
$ find utfcpp-4.0.6 -name compile_commands.json
$ find soxr-0.1.3 -name build.ninja
soxr-0.1.3/.x86_64-libreelec-linux-gnu/build.ninja
$ find soxr-0.1.3 -name compile_commands.json
soxr-0.1.3/.x86_64-libreelec-linux-gnu/compile_commands.json
When removing the define CMAKE_EXPORT_COMPILE_COMMANDS:
--- a/scripts/build
+++ b/scripts/build
@@ -147,8 +147,7 @@
MESON_BUILD_TYPE="plain"
fi
-CMAKE_GENERATOR_NINJA="-GNinja \
- -DCMAKE_EXPORT_COMPILE_COMMANDS=ON"
+CMAKE_GENERATOR_NINJA="-GNinja"
# configure TARGET build defaults
TARGET_CONFIGURE_OPTS="--host=${TARGET_NAME} \
The resulting build do not have the warning with utfcpp but the files
compile_commands.json are not created (as expected.)
$ find utfcpp-4.0.6 -name build.ninja
utfcpp-4.0.6/.x86_64-libreelec-linux-gnu/build.ninja
$ find utfcpp-4.0.6 -name compile_commands.json
$ find soxr-0.1.3 -name build.ninja
soxr-0.1.3/.x86_64-libreelec-linux-gnu/build.ninja
$ find soxr-0.1.3 -name compile_commands.json
With the change to declare CMAKE_EXPORT_COMPILE_COMMANDS as an environment
variable the warning is not preset with utfcpp and the compile_commands.json
are created, matching the current functionaility but without the warning.
Ref:
- https://cmake.org/cmake/help/latest/variable/CMAKE_EXPORT_COMPILE_COMMANDS.html
- This is initialized by the CMAKE_EXPORT_COMPILE_COMMANDS environment variable.
- https://cmake.org/cmake/help/latest/envvar/CMAKE_EXPORT_COMPILE_COMMANDS.html#envvar:CMAKE_EXPORT_COMPILE_COMMANDS
- https://stackoverflow.com/questions/20059670/how-to-use-cmake-export-compile-commands
