On 08/07/2020 08:13, Sebastian Huber wrote: > On 08/07/2020 08:10, Niteesh G. S. wrote: > >> On Tue, Jul 7, 2020 at 10:42 AM Sebastian Huber >> <sebastian.hu...@embedded-brains.de >> <mailto:sebastian.hu...@embedded-brains.de>> wrote: >> >> Hello, >> >> the problem is that the new build system doesn't export optimization >> flags such as -Wl,--gc-sections. The libbsd build should enable this >> linker option unconditionally. >> >> >> Thank you. I got it fixed (temporarily) by modifying rtems.py. >> >> conf.env.CFLAGS = cflags['cflags'] + ['-ffunction-sections'] + >> ['-fdata-sections'] > This instructs the compiler to add data elements and functions into > separate sections. This is necessary so that the linker can carry out > the garbage collection.
There is an unused function in libbsd that can't link because a function it calls isn't there. Till now the two flags had been provided by the BSP. It seems that now they are not provided anymore. The problematic function is m_unmappedtouio in uipc_mbuf.c. It tries to use PHYS_TO_VM_PAGE which isn't defined in libbsd. I think we should just remove m_unmappedtouio (with #ifndef __rtems__) on the longer term. But not having the -ffunction-sections and -fdata-sections most likely makes our binary bigger and maybe leads to other similar bugs. Therefore I suggested to add the CFLAGS first. >> >> As per Christian suggestions, I tried exporting CFLAGS with these GCC >> flags and then calling ./waf configure but they didn't work. > You have to add -Wl,--gc-sections to the linker flags. As far as I know Niteesh used that one too. I think for that one LDFLAGS worked as a workarround. Best regards Christian -- -------------------------------------------- embedded brains GmbH Herr Christian Mauderer Dornierstr. 4 D-82178 Puchheim Germany email: christian.maude...@embedded-brains.de Phone: +49-89-18 94 741 - 18 Fax: +49-89-18 94 741 - 08 PGP: Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel