* [Buildroot] outdated libiberty and prelink-cross support @ 2022-11-02 13:05 Romain Naour 2023-02-08 15:53 ` Thomas Petazzoni via buildroot 0 siblings, 1 reply; 3+ messages in thread From: Romain Naour @ 2022-11-02 13:05 UTC (permalink / raw) To: buildroot@buildroot.org Hello I was looking at host-binutils-2.38 issue in the autobuilder [1]. The issue appear only when host-libiberty is built before host-binutils (Binutils 2.38 only). It seems that libiberty package is still based on binutils 2.32 release and seems to be updated. host-libiberty is currently used by host-gdb and host-prelink-cross packages. About the prelink-cross package, it come from the Yocto project [2] but the support seems halted. Also the Glibc project will remove prelink support for the upcoming 2.37 release [3]. The annoying part is "Prelink-cross emulates a runtime linker for a given sysroot. This is necessary to allow gobject-introspection to build its typelib files during cross-compiling." [4] host-prelink-cross is currently used by dracut and gobject-introspection packages. Contributions are welcome! [1] http://autobuild.buildroot.org/?reason=host-binutils-2.38 [2] https://git.yoctoproject.org/prelink-cross [3] https://lists.gnu.org/archive/html/info-gnu/2022-08/msg00000.html [4] https://gitlab.com/buildroot.org/buildroot/-/commit/8af40358e3885440248aa783490096bdd1b7a90c Best regards, Romain _______________________________________________ buildroot mailing list buildroot@buildroot.org https://lists.buildroot.org/mailman/listinfo/buildroot ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Buildroot] outdated libiberty and prelink-cross support 2022-11-02 13:05 [Buildroot] outdated libiberty and prelink-cross support Romain Naour @ 2023-02-08 15:53 ` Thomas Petazzoni via buildroot 2023-02-08 16:10 ` Romain Naour 0 siblings, 1 reply; 3+ messages in thread From: Thomas Petazzoni via buildroot @ 2023-02-08 15:53 UTC (permalink / raw) To: Romain Naour; +Cc: Yann E. MORIN, Adam Duskett, buildroot@buildroot.org Hello, +Yann and Adam, with questions/help needed below :) On Wed, 2 Nov 2022 14:05:26 +0100 Romain Naour <romain.naour@smile.fr> wrote: > I was looking at host-binutils-2.38 issue in the autobuilder [1]. > The issue appear only when host-libiberty is built before host-binutils > (Binutils 2.38 only). > > It seems that libiberty package is still based on binutils 2.32 release and > seems to be updated. > > host-libiberty is currently used by host-gdb and host-prelink-cross packages. > > About the prelink-cross package, it come from the Yocto project [2] but the > support seems halted. Also the Glibc project will remove prelink support for the > upcoming 2.37 release [3]. > > The annoying part is "Prelink-cross emulates a runtime linker for a given > sysroot. This is necessary to allow gobject-introspection to build its typelib > files during cross-compiling." [4] > > host-prelink-cross is currently used by dracut and gobject-introspection packages. I had a look, and there are things at two different levels that can be done. First, we need to remove the package/libiberty/ package. libiberty is currently used by host-gdb and host-prelink-cross: * For host-gdb, the commit log says that the host libiberty might be picked up so we need to build our own. This is weird because libiberty is shipped in the gdb tarball. Yann, when you applied f0a583ddc4c2cab121330284e316f54229dee492, do you remember if you looked at why GDB wasn't picking up its own libiberty? Also, there is no autobuilder failure, so we don't really know under what conditions the problem can be reproduced. * For host-prelink-cross, it in fact doesn't need host-libiberty. It links against it, but apparently, the only functions it uses from libiberty are htab_find_slot() and htab_try_create(), and both are provided by src/hashtab.c in prelink-cross, which was copy/pasted from libiberty, most likely to avoid the dependency. So with a bit of effort in host-prelink-cross, the dependency on host-libiberty could be removed. Then, the second level is about host-prelink-cross itself. It is used by only two packages, so let's have a look: * For gobject-instrospection, it is no longer needed: openembedded-core stopped using it in https://github.com/openembedded/openembedded-core/commit/767e0880d4d729e659e859dd99c1cdb084b8ba51. It simply uses "objdump -p" instead. It also allows to remove a patch from gobject-introspection, so overall it seems like a good thing. * For dracut, the usage is pretty much the same, and a small wrapper around objdump -p would most likely be able to emulate the behavior lf prelink-rtld to list the libraries that a binary depends on. So there's a bit of work for sure, but this work would allow to remove both host-libiberty and host-prelink-cross, which are both weird packages that will inevitably cause problems. My main concerns are: (1) How to reproduce the host-gdb issue that caused the addition of the host-liberty dependency (2) How to test gobject-introspection in a simple way. There is no runtime test for it, I have no idea what is the simplest test that one can do to verify the proper functionality of gobject-introspection after we do the above changes. Best regards, Thomas Petazzoni -- Thomas Petazzoni, co-owner and CEO, Bootlin Embedded Linux and Kernel engineering and training https://bootlin.com _______________________________________________ buildroot mailing list buildroot@buildroot.org https://lists.buildroot.org/mailman/listinfo/buildroot ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Buildroot] outdated libiberty and prelink-cross support 2023-02-08 15:53 ` Thomas Petazzoni via buildroot @ 2023-02-08 16:10 ` Romain Naour 0 siblings, 0 replies; 3+ messages in thread From: Romain Naour @ 2023-02-08 16:10 UTC (permalink / raw) To: Thomas Petazzoni; +Cc: Yann E. MORIN, Adam Duskett, buildroot@buildroot.org Hello, Le 08/02/2023 à 16:53, Thomas Petazzoni a écrit : > Hello, > > +Yann and Adam, with questions/help needed below :) > > On Wed, 2 Nov 2022 14:05:26 +0100 > Romain Naour <romain.naour@smile.fr> wrote: > >> I was looking at host-binutils-2.38 issue in the autobuilder [1]. >> The issue appear only when host-libiberty is built before host-binutils >> (Binutils 2.38 only). >> >> It seems that libiberty package is still based on binutils 2.32 release and >> seems to be updated. >> >> host-libiberty is currently used by host-gdb and host-prelink-cross packages. >> >> About the prelink-cross package, it come from the Yocto project [2] but the >> support seems halted. Also the Glibc project will remove prelink support for the >> upcoming 2.37 release [3]. >> >> The annoying part is "Prelink-cross emulates a runtime linker for a given >> sysroot. This is necessary to allow gobject-introspection to build its typelib >> files during cross-compiling." [4] >> >> host-prelink-cross is currently used by dracut and gobject-introspection packages. > > I had a look, and there are things at two different levels that can be > done. Thanks! > > First, we need to remove the package/libiberty/ package. libiberty is > currently used by host-gdb and host-prelink-cross: > > * For host-gdb, the commit log says that the host libiberty might be > picked up so we need to build our own. This is weird because > libiberty is shipped in the gdb tarball. Yann, when you applied > f0a583ddc4c2cab121330284e316f54229dee492, do you remember if you > looked at why GDB wasn't picking up its own libiberty? Also, there is > no autobuilder failure, so we don't really know under what conditions > the problem can be reproduced. I had a look before writing this email and I was not sure about libiberty dependency. For me gdb build its own version. I wasn't able to prove that it can use libiberty from the host if available. > > * For host-prelink-cross, it in fact doesn't need host-libiberty. It > links against it, but apparently, the only functions it uses from > libiberty are htab_find_slot() and htab_try_create(), and both are > provided by src/hashtab.c in prelink-cross, which was copy/pasted > from libiberty, most likely to avoid the dependency. So with a bit of > effort in host-prelink-cross, the dependency on host-libiberty could > be removed. > > Then, the second level is about host-prelink-cross itself. It is used > by only two packages, so let's have a look: > > * For gobject-instrospection, it is no longer needed: openembedded-core > stopped using it in > https://github.com/openembedded/openembedded-core/commit/767e0880d4d729e659e859dd99c1cdb084b8ba51. > It simply uses "objdump -p" instead. It also allows to remove a patch > from gobject-introspection, so overall it seems like a good thing. > > * For dracut, the usage is pretty much the same, and a small wrapper > around objdump -p would most likely be able to emulate the behavior > lf prelink-rtld to list the libraries that a binary depends on. > > So there's a bit of work for sure, but this work would allow to remove > both host-libiberty and host-prelink-cross, which are both weird > packages that will inevitably cause problems. > > My main concerns are: > > (1) How to reproduce the host-gdb issue that caused the addition of the > host-liberty dependency Looking at distribution packaging, the gdb package use a bundled libiberty library: https://src.fedoraproject.org/rpms/gdb/blob/rawhide/f/gdb.spec#_122 > > (2) How to test gobject-introspection in a simple way. There is no > runtime test for it, I have no idea what is the simplest test that one > can do to verify the proper functionality of gobject-introspection > after we do the above changes. Sorry I don't know. Best regards, Romain > > Best regards, > > Thomas Petazzoni _______________________________________________ buildroot mailing list buildroot@buildroot.org https://lists.buildroot.org/mailman/listinfo/buildroot ^ permalink raw reply [flat|nested] 3+ messages in thread
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