ROOTTEST_GENERATE_REFLEX_DICTIONARY output does not depend on rootcling/genreflex

Hi,

The dictionary generated in roottest via the ctest ROOTTEST_GENERATE_REFLEX_DICTIONARY macro do not always get rebuild when rootcling/genreflex is updated resulting in false failure.

For example in roottest/root/io/cpp11Containers, I build ROOT and ran ctest. Then I modified rootcling and libCling in a way that only new dictionary works with the new libCling. Then I rebuild ROOT and ran ctest (simply by typing ctest from the build directory). The result is that the test in roottest/root/io/cpp11Containers (and others) failed in way that made it clear the dictionary were not rebuild and indeed, I have:

-rw-r--r--   1 pcanal  wheel    72049 Nov 13 20:40 forwardList.cxx

but I also have:

-rwxr-xr-x  3 pcanal  wheel  55207100 Nov 13 22:16 /opt/build/root_builds/rootcling.cmake/bin/rootcling

-rwxr-xr-x  3 pcanal  wheel  55207100 Nov 13 22:16 /opt/build/root_builds/rootcling.cmake/bin/genreflex

I re-ran ctest several time, including after cd-ing to roottest/root/io/cpp11Containers in the build directory and the dictionary never got rebuild until I deleted them by hand ...

Philippe.

mac-122034:cpp11Containers pcanal$ ctest .
Test project /opt/build/root_builds/rootcling.cmake/roottest/root/io/cpp11Containers
Start 1: roottest-root-io-cpp11Containers-forwardList-libgen-build
1/7 Test #1: roottest-root-io-cpp11Containers-forwardList-libgen-build .... Passed 0.62 sec
Start 2: roottest-root-io-cpp11Containers-forwardList
2/7 Test #2: roottest-root-io-cpp11Containers-forwardList .................***Failed 5.47 sec
Start 3: roottest-root-io-cpp11Containers-unorderedSet-libgen-build
3/7 Test #3: roottest-root-io-cpp11Containers-unorderedSet-libgen-build ... Passed 0.46 sec
Start 4: roottest-root-io-cpp11Containers-unorderedSet
4/7 Test #4: roottest-root-io-cpp11Containers-unorderedSet ................***Failed 4.58 sec
Start 5: roottest-root-io-cpp11Containers-unorderedMap-libgen-build
5/7 Test #5: roottest-root-io-cpp11Containers-unorderedMap-libgen-build ... Passed 0.46 sec
Start 6: roottest-root-io-cpp11Containers-unorderedMap
6/7 Test #6: roottest-root-io-cpp11Containers-unorderedMap ................***Failed 20.06 sec
Start 7: roottest-root-io-cpp11Containers-Names
7/7 Test #7: roottest-root-io-cpp11Containers-Names .......................***Failed 2.34 sec

PS. Alternatively what is the way to 'clean' for sure the ctest build area?