Created attachment 9451 [details] quick fix gcc --help -v 2>&1 | grep ffunction-sections This should display the option with description. But with buildroot gcc>=10 with RELRO protection configured to Partial or Full, this doesn't work (doesn't display anything). So affected buildroots are with versions >=2020.11.2 You can check this with bootlin compilers with buildroot>=2021.11 The cause of this is: 1) from gcc 10, the following doesn't work: gcc -Wl,--some-flag --help -v 2>&1 | grep ffunction-section I created a bug report: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108328 2) toolchain-wrapper with BR2_RELRO_PARTIAL or BR2_RELRO_FULL adds -Wl,-z,relro linker flags which trigger this now, BR2_RELRO_PARTIAL or BR2_RELRO_FULL are the default since 2021.05. Moreover, this causes the python and python3 package to compile without the -fwrapv option, because python detects it using the: gcc --help -v 2>&1 | grep fwrapv This is just one example that I stumbled upon, I think this can cause problems in general, and in other packages that do these kinds of checks. I attached a quick fix patch (should I send it to the mailing list too?), but feel free to comment on the gcc bug report I created.
in newer versions of buildroot -Wl,-z,max-page-size is added, so this bug happens even if RELRO protection is configured to None
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