depends: expat 2.4.8 & fix building with -flto #25697
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GUIX hashes for lto_in_guix x86: arm64: |
hebasto
reviewed
Jul 25, 2022
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Currently, when building the expat package in depends, using -flto (LTO=1), inside Guix (and only inside Guix from what I've seen), the configure check fails...
It fails not only inside Guix, but for every cross-compiling, e.g.,:
$ make -C depends expat_configured LTO=1 HOST=arm-linux-gnueabihf
Considering that the _DEFAULT_SOURCE macro implies a wider feature set than the _POSIX_C_SOURCE one, is it safe to define the former for a dependency while the latter been used in
Line 45 in aa22009
?
This was referenced Jul 25, 2022
I don't really think that makes much of a difference here. _DEFAULT_SOURCE is still only used for the expat build. |
hebasto
approved these changes
Jul 26, 2022
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ACK 790ae82, I have reviewed the code and it looks OK, I agree it can be merged.
It's worth to mention that in the span from v2.4.1 to v2.4.8 a few CVEs have been fixed.
I've verified that no other adjustments of our depends build system required.
Successfully can cross-compile the expat package in depends with LTO=1.
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Addressed the suggestion and updated the PR description. |
fanquake
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jarolrod
reviewed
Jul 26, 2022
This doesn't fail for me. What system is this on? What compiler are you using etc? |
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I've opened an issue upstream: libexpat/libexpat#618. |
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Not an expat bug, so I've submitted a report further upstream to autoconf: https://savannah.gnu.org/support/index.php?110687. |
sidhujag
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Jul 27, 2022
e838a98 depends: re-enable using -flto when building expat (fanquake) 3044525 depends: expat 2.4.8 (fanquake) Pull request description: Currently, when building the expat package in depends, using `-flto` (`LTO=1`), the configure check can fail, because it cannot determine the system endianess: ```bash configure:18718: result: unknown configure:18733: error: unknown endianness presetting ac_cv_c_bigendian=no (or yes) will help ``` Fix that by defining `_DEFAULT_SOURCE`, which in turn defines `__USE_MISC` (`features.h`): ```c #if defined _DEFAULT_SOURCE # define __USE_MISC1 #endif ``` which exposes additional definitions in `endian.h`: ```c #include <features.h> /* Get the definitions of __*_ENDIAN, __BYTE_ORDER, and __FLOAT_WORD_ORDER. */ #include <bits/endian.h> #ifdef __USE_MISC # define LITTLE_ENDIAN__LITTLE_ENDIAN # define BIG_ENDIAN__BIG_ENDIAN # define PDP_ENDIAN__PDP_ENDIAN # define BYTE_ORDER__BYTE_ORDER #endif ``` and gives us a working configure. You could test building this change with Guix + LTO with [this branch](https://github.com/fanquake/bitcoin/tree/lto_in_guix). Note that that build may fail for other reasons (on x86_64), unrelated to this change. Some related upstream discussion: https://bugs.gentoo.org/757681 https://forums.gentoo.org/viewtopic-t-1013786.html ACKs for top commit: hebasto: re-ACK e838a98, only [suggested](bitcoin#25697 (comment)) changes since my recent [review](bitcoin#25697 (review)). jarolrod: code review ACK e838a98 Tree-SHA512: 9dbf64c9bd1fd995a4d1addc011ffeff83d50df736030012346c97605e63aed4b5bac390a81abe646c1be28ad6fd600f64560dcb26bbc2edf5d513ca3b180bfa
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This has now also been fixed in autoconf upstream: https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=234fc6c86613ed3f366dd1d88996e4d5d85ee222. |
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Currently, when building the expat package in depends, using
-flto(LTO=1), the configure check can fail, because it cannot determine the system endianess:configure:18718: result: unknown configure:18733: error: unknown endianness presetting ac_cv_c_bigendian=no (or yes) will helpFix that by defining
_DEFAULT_SOURCE, which in turn defines__USE_MISC(features.h):which exposes additional definitions in
endian.h:and gives us a working configure.
You could test building this change with Guix + LTO with this branch. Note that that build may fail for other reasons (on x86_64), unrelated to this change.
Some related upstream discussion:
https://bugs.gentoo.org/757681
https://forums.gentoo.org/viewtopic-t-1013786.html