Hello, Finally, I have been able to update all tests with -Wreturn-type enabled by default. AFAIK, under GNU/Linux Debian Jessie 64 bits, there is no PASS->FAIL tests. Now, I would like to know if I can commit that into the repository. Who can review that? As attachment, you will find the actual (tiny) patch. I split the tests update by languages. As they are big ( 1260 files changed, 1638 insertions(+), 903 deletions(-) ), I uploaded the patches on my server: http://sylvestre.ledru.info/bordel/patch/0002-Update-Objective-c-tests-with-warning-return-type-en.patch http://sylvestre.ledru.info/bordel/patch/0003-Update-Fortran-tests-with-warning-return-type-enable.patch http://sylvestre.ledru.info/bordel/patch/0004-Update-gcc-tests-with-warning-return-type-enabled-by.patch http://sylvestre.ledru.info/bordel/patch/0005-Update-C-tests-with-warning-return-type-enabled-by-d.patch http://sylvestre.ledru.info/bordel/patch/0006-Update-OpenMP-tests-with-warning-return-type-enabled.patch Thanks, Sylvestre