[please keep the list in cc] On Fri, Aug 27, 2021 at 2:25 PM Mahyar Shokraeian <mahyarshokraeian@xxxxxxxx> wrote: > Hi. Sorry I forgot to attach the build.log file. Yes crosstool-ng > officially supports FDPIC. Can I ask how do you build your toolchains > without the use of crosstool-ng? > The log is not very informative, though it fails in /home/mahyar1284/embedded/crosstool-ng/.build/arm-linux-uclibcgnueabi/build/build-libc-final/multilib which seems to confirm that it is building libpthread in several configurations, include a thumb-1 one, which is not supported. How is gcc configured? (what is the output of arm-none-uclinuxfdpiceabi-gcc -v?) Why does crosstool-ng want to build multilibs? Maybe you can disable this? For my toolchain builds & testing, I'm using custom scripts. Christophe > > Mahyar > > > > > > Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows > > > ------------------------------ > *From:* Christophe Lyon <christophe.lyon.oss@xxxxxxxxx> > *Sent:* Thursday, August 26, 2021 5:31:34 PM > *To:* Mahyar Shokraeian <mahyarshokraeian@xxxxxxxx>; gcc-help@xxxxxxxxxxx > <gcc-help@xxxxxxxxxxx> > *Subject:* Re: why gcc won't support FDPIC in thumb mode? > > > > On Thu, Aug 26, 2021 at 1:24 PM Mahyar Shokraeian < > mahyarshokraeian@xxxxxxxx> wrote: > > Hi. Thank you for your response. This is where it throws the error: > > I’ve also attached my build.log and my crosstool-ng .config file for more > accurate info. Thanks for helping me out. > > > Hello, > > Looks like you forgot to attach build.log? > > Sorry I don't use crosstool-ng, so I am afraid I won't be able to help > much. > Does crosstool-ng actually support arm FDPIC configs? > > Christophe > > > > > [INFO ] ================================================================= > > [INFO ] Installing pass-2 core C gcc compiler > > [EXTRA] Configuring core C gcc compiler > > [EXTRA] Building gcc > > [EXTRA] Installing gcc > > [EXTRA] Housekeeping for core gcc compiler > > [EXTRA] '' --> lib (gcc) lib (os) > > [INFO ] Installing pass-2 core C gcc compiler: done in 1375.84s (at 58:08) > > [INFO ] Saving state to restart at step 'libc_main'... > > [INFO ] ================================================================= > > [INFO ] Installing C library > > [INFO ] > ================================================================= > > [INFO ] Building for multilib 1/1: '' > > [EXTRA] Copying sources to build dir > > [EXTRA] Applying configuration > > [EXTRA] Cleaning up startfiles > > [EXTRA] Building C library > > [ERROR] make[2]: *** [Makerules:369: > libpthread/linuxthreads_db/td_thr_setprio.os] Error 1 > > [ERROR] > > [ERROR] >> > > [ERROR] >> Build failed in step 'Building for multilib 1/1: ''' > > [ERROR] >> called in step 'Installing C library' > > [ERROR] >> called in step '(top-level)' > > [ERROR] >> > > [ERROR] >> Error happened in: CT_DoExecLog[scripts/functions@376] > > [ERROR] >> called from: > uClibc_backend_once[scripts/build/libc/uClibc.sh@185] > > [ERROR] >> called from: CT_IterateMultilibs[scripts/functions@1608 > ] > > [ERROR] >> called from: > uClibc_backend[scripts/build/libc/uClibc.sh@36] > > [ERROR] >> called from: uClibc_main[scripts/build/libc/uClibc.sh@16 > ] > > [ERROR] >> called from: do_libc_main[scripts/build/libc.sh@33] > > [ERROR] >> called from: main[scripts/crosstool-NG.sh@697] > > [ERROR] >> > > [ERROR] >> For more info on this error, look at the file: 'build.log' > > [ERROR] >> There is a list of known issues, some with workarounds, in: > > [ERROR] >> https://crosstool-ng.github.io/docs/known-issues/ > > [ERROR] >> > > [ERROR] >> If you feel this is a bug in crosstool-NG, report it at: > > [ERROR] >> https://github.com/crosstool-ng/crosstool-ng/issues/ > > [ERROR] >> > > [ERROR] >> Make sure your report includes all the information pertinent > to this issue. > > [ERROR] >> Read the bug reporting guidelines here: > > [ERROR] >> http://crosstool-ng.github.io/support/ > > [ERROR] > > [ERROR] (elapsed: 58:52.62) > > [58:54] / make[1]: *** [/usr/local/bin/ct-ng:261: build] Error 2 > > make: *** [/usr/local/bin/ct-ng:265: build.0] Error 2 > > > > > > Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows > > > ------------------------------ > *From:* Christophe Lyon <christophe.lyon.oss@xxxxxxxxx> > *Sent:* Thursday, August 26, 2021 1:14:36 PM > *To:* Mahyar Shokraeian <mahyarshokraeian@xxxxxxxx> > *Cc:* gcc-help@xxxxxxxxxxx <gcc-help@xxxxxxxxxxx> > *Subject:* Re: why gcc won't support FDPIC in thumb mode? > > Hello, > > On Thu, Aug 26, 2021 at 1:06 AM Mahyar Shokraeian via Gcc-help < > gcc-help@xxxxxxxxxxx> wrote: > > why gcc won't support FDPIC in thumb mode? > > I'm trying to build a toolchain for my mmu-less cortex m7 cpu that is > running the latest release of the mainline linux kernel using crosstool-ng. > I've set the instruction-set to thumb because cortex m doesn't support ARM > ISA (it's a thumb only processor). > > because I use shared libraries, I need FDPIC ELF instead of flat BFLT > executables. so, I choosed FDPIC in the crosstool-ng configuration > menuconfig. > > when I build the toolchain, it throws a very strange error. > > cc1: sorry, unimplemented: FDPIC mode is not supported in Thumb-1 mode > > I'm so confused! FDPIC ELF format is mainly designed for mmu-less > architectures such as cortex-m and cortex-r that are thumb only processors. > so why it is saying that FDPIC mode is not supported in Thumb-1 mode? > Even I've set -mcpu=cortex-m7 and -march=armv7e-m in my toolchain > configuration but still I see the error. > > > At which point exactly do you see this error? > > I run daily builds of arm-none-uclinuxfdpiceabi for cortex-m4, which is > similar to cortex-m7 from FDPIC perspective. > Both support thumb-2, so it should be OK. > > Note that FDPIC support has not been ported to thumb-1, as indicated by > the error message you are seeing. > Maybe you are facing the problem when building multilibs for thumb1? > > Christophe > > these are some useful sources about fdpic format on ARM MCUs: > > > https://static.linaro.org/connect/sfo15/Presentations/09-24-Thursday/SFO15-406-%20ARM%20FDPIC%20Toolchains.pdf > > https://gcc.gnu.org/legacy-ml/gcc-patches/2019-09/msg00098.html > > https://gcc.gnu.org/legacy-ml/gcc-patches/2019-09/msg00533.html > > > https://www.google.com/url?sa=t&source=web&rct=j&url=https://ntnuopen.ntnu.no/ntnu-xmlui/bitstream/handle/11250/250748/347817_FULLTEXT01.pdf%3Fsequence%3D3&ved=2ahUKEwiztaiqgMbyAhUFwKQKHeeGAGQ4ChAWegQIHRAB&usg=AOvVaw3SLe1u323I7JjkoqBipoXH > > > Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows > >
