Summary

In cmake, option -DMBEDTLS_CONFIG_FILE=my_mbedtls_config.h makes that file take the place of include/mbedtls/mbedtls_config.h. However, during cmake install, the override is ignored and the original include/mbedtls/mbedtls_config.h is copied into the build area.

System information

Mbed TLS version (number or commit id): 2ca6c285a0dd3f33982dd57299012dacab1ff206 (though no change is apparent on the default development branch)
Operating system and version: Fedora 41
Configuration (if not default, please attach mbedtls_config.h): (not relevant)
Compiler and options (if you used a pre-built binary, please indicate how you obtained it): (not relevant)
Additional environment information:

Expected behavior

When the user specifies an alternative mbedtls_config.h, it should not only be used in the build, but also be installed. Otherwise the mbedtls_config.h in the installed includes is not consistent with the build it corresponds to.

Actual behavior

cmake copies the original include/mbedtls/mbedtls_config.h instead of the one that was actually used to produce the corresponding build.

Steps to reproduce

Set flag -DMBEDTLS_CONFIG_FILE to any file other than include/mbedtls/mbedtls_config.h and observe that in fact it is the latter file which is installed, not the former.

Additional information