'How to recursively expand cmake generator expressions?

I am using a cmake generator expression to read a target property

set_tests_properties(
    Java-wrapper
PROPERTIES
    ENVIRONMENT _JAVA_OPTIONS=-Djava.library.path=$<TARGET_PROPERTY:ktx-jni,LIBRARY_OUTPUT_DIRECTORY>
)

LIBRARY_OUTPUT_DIRECTORY is itself defined using a generator expression

set_target_properties(ktx-jni PROPERTIES
    LIBRARY_OUTPUT_DIRECTORY ${KTX_BUILD_DIR}/$<CONFIG>
)

During build LIBRARY_OUTPUT_DIRECTORY is expanded correctly and the built library appears in Debug or Release as expected. However in the environment seen by the test $<CONFIG> is not expanded.

Picked up _JAVA_OPTIONS: -Djava.library.path=/Users/mark/Projects/khronos/github/KTX-Software/build/macos/$<CONFIG>

If instead I use

ENVIRONMENT _JAVA_OPTIONS=-Djava.library.path=${KTX_BUILD_DIR}/$<CONFIG>

$<CONFIG> is expanded correctly and the test runs successfully.

How can I get cmake to recursively expand LIBRARY_OUTPUT_DIRECTORY?

cmake


Solution 1:[1]

I found the solution, use TARGET_GENEX_EVAL, as in the below.

    ENVIRONMENT _JAVA_OPTIONS=-Djava.library.path=$<TARGET_GENEX_EVAL:ktx-jni,$<TARGET_PROPERTY:ktx-jni,LIBRARY_OUTPUT_DIRECTORY>>

I missed it before because it is listed under String Transformations not Target Dependent Queries in the cmake documentation.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 msc

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