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| author | fanquake <fanquake@gmail.com> | 2022-07-27 12:56:03 +0100 |
|---|---|---|
| committer | fanquake <fanquake@gmail.com> | 2022-07-27 12:56:17 +0100 |
| commit | 207a22877330709e4462e6092c265ab55c8653ac (patch) | |
| tree | d9f702b52521e6efb4b2f44f87818525aee7fdd0 /src/consensus | |
| parent | 9ba73758c908ce0c49f1bd9727ea496958e24d54 (diff) | |
| parent | e838a9847580527b8321d65e57b1c53cc2af6bf4 (diff) | |
Merge bitcoin/bitcoin#25697: depends: expat 2.4.8 & fix building with -flto
e838a9847580527b8321d65e57b1c53cc2af6bf4 depends: re-enable using -flto when building expat (fanquake)
304452558c7f6f5e32ba13d8f05325790c8a4f5f 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 e838a9847580527b8321d65e57b1c53cc2af6bf4, only [suggested](https://github.com/bitcoin/bitcoin/pull/25697#discussion_r929735675) changes since my recent [review](https://github.com/bitcoin/bitcoin/pull/25697#pullrequestreview-1050657421).
jarolrod:
code review ACK e838a9847580527b8321d65e57b1c53cc2af6bf4
Tree-SHA512: 9dbf64c9bd1fd995a4d1addc011ffeff83d50df736030012346c97605e63aed4b5bac390a81abe646c1be28ad6fd600f64560dcb26bbc2edf5d513ca3b180bfa
Diffstat (limited to 'src/consensus')
0 files changed, 0 insertions, 0 deletions