Thread: Building with meson on NixOS/nixpkgs
To build on NixOS/nixpkgs I came up with a few small patches to meson.build. All of this works fine with Autoconf/Make already.
Attachment
Hi, Thank you for the patches! On Sat, 16 Mar 2024 at 14:48, Wolfgang Walther <walther@technowledgy.de> wrote: > > To build on NixOS/nixpkgs I came up with a few small patches to > meson.build. All of this works fine with Autoconf/Make already. I do not have NixOS but I confirm that patches cleanly apply to master and do pass CI. I have a small feedback: 0001 & 0002: Adding code comments to explain why they have fallback could be nice. 0003: Looks good to me. -- Regards, Nazir Bilal Yavuz Microsoft
On 2024-Mar-16, Wolfgang Walther wrote:
> The upstream name for the ossp-uuid package / pkg-config file is "uuid". Many
> distributions change this to be "ossp-uuid" to not conflict with e2fsprogs.
I can confirm that this is true for Debian, at least; the packaging
rules have this in override_dh_install:
install -D -m 644 debian/tmp/usr/lib/$(DEB_HOST_MULTIARCH)/pkgconfig/uuid.pc \
debian/libossp-uuid-dev/usr/lib/pkgconfig/ossp-uuid.pc
which matches the fact that Engelschall's official repository has the
file named simply uuid.pc:
https://github.com/rse/uuid/blob/master/uuid.pc.in
--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
Nazir Bilal Yavuz: > 0001 & 0002: Adding code comments to explain why they have fallback > could be nice. > 0003: Looks good to me. Added some comments in the attached. Best, Wolfgang
Attachment
Wolfgang Walther: > To build on NixOS/nixpkgs I came up with a few small patches to > meson.build. All of this works fine with Autoconf/Make already. In v3, I added another small patch for meson, this one about proper handling of -Dlibedit_preferred when used together with -Dreadline=enabled. Best, Wolfgang
Attachment
Hi, From your prior reply: On Thu, 21 Mar 2024 at 23:44, Wolfgang Walther <walther@technowledgy.de> wrote: > > Nazir Bilal Yavuz: > > 0001 & 0002: Adding code comments to explain why they have fallback > > could be nice. > > 0003: Looks good to me. > > Added some comments in the attached. Comments look good, thanks. On Fri, 29 Mar 2024 at 21:48, <walther@technowledgy.de> wrote: > > In v3, I added another small patch for meson, this one about proper > handling of -Dlibedit_preferred when used together with -Dreadline=enabled. You are right. I confirm the bug and your proposed patch fixes this. -- Regards, Nazir Bilal Yavuz Microsoft
On 29.03.24 19:47, walther@technowledgy.de wrote:
> - uuid = dependency('ossp-uuid', required: true)
> + # upstream is called "uuid", but many distros change this to
"ossp-uuid"
> + uuid = dependency('ossp-uuid', 'uuid', required: true)
How would this behave if you have only uuid.pc from e2fsprogs installed
but choose -Duuid=ossp? Then it would pick up uuid.pc here, but fail to
compile later?
Peter Eisentraut:
> On 29.03.24 19:47, walther@technowledgy.de wrote:
> > - uuid = dependency('ossp-uuid', required: true)
> > + # upstream is called "uuid", but many distros change this to
> "ossp-uuid"
> > + uuid = dependency('ossp-uuid', 'uuid', required: true)
>
> How would this behave if you have only uuid.pc from e2fsprogs installed
> but choose -Duuid=ossp? Then it would pick up uuid.pc here, but fail to
> compile later?
It would still fail the meson setup step, because for e2fs we have:
uuidfunc = 'uuid_generate'
uuidheader = 'uuid/uuid.h'
while for ossp we have:
uuidfunc = 'uuid_export'
uuidheader = 'uuid.h'
and later we do:
if not cc.has_header_symbol(uuidheader, uuidfunc, args: test_c_args,
dependencies: uuid)
error('uuid library @0@ missing required function
@1@'.format(uuidopt, uuidfunc))
endif
Best,
Wolfgang
Heikki asked me to take a look at this patchset for the commitfest. Looks good to me. Heikki, just be careful rebasing the first patch. You need to make sure the newly set `required: false` gets carried forward. -- Tristan Partin Neon (https://neon.tech)
On 26/07/2024 23:01, Tristan Partin wrote: > Heikki asked me to take a look at this patchset for the commitfest. > Looks good to me. > > Heikki, just be careful rebasing the first patch. You need to make sure > the newly set `required: false` gets carried forward. Committed and backpatched to v16 and v17. Thanks for the good explanations in the commit messages, Walther! -- Heikki Linnakangas Neon (https://neon.tech)
Hi,
commit 4d8de281b5834c8f5e0be6ae21e884e69dffd4ce
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-07-27 13:53:11 +0300
Fallback to clang in PATH with meson
Some distributions put clang into a different path than the llvm
binary path.
For example, this is the case on NixOS / nixpkgs, which failed to find
clang with meson before this patch.
I think this is a bad change unfortunately - this way clang and llvm version
can mismatch. Yes, we've done it that way for autoconf, but back then LLVM
broke compatibility far less often.
commit a00fae9d43e5adabc56e64a4df6d332062666501
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-07-27 13:53:08 +0300
Fallback to uuid for ossp-uuid with meson
The upstream name for the ossp-uuid package / pkg-config file is
"uuid". Many distributions change this to be "ossp-uuid" to not
conflict with e2fsprogs.
This lookup fails on distributions which don't change this name, for
example NixOS / nixpkgs. Both "ossp-uuid" and "uuid" are also checked
in configure.ac.
Author: Wolfgang Walther
Reviewed-by: Nazir Bilal Yavuz, Alvaro Herrera, Peter Eisentraut
Reviewed-by: Tristan Partin
Discussion: https://www.postgresql.org/message-id/ca8f37e1-a2c3-40e2-91f6-59c3d3652ad4@technowledgy.de
Backpatch: 16-, where meson support was added
I think this is a redundant change with
commit 2416fdb3ee30bdd2810408f93f14d47bff840fea
Author: Andres Freund <andres@anarazel.de>
Date: 2024-07-20 13:51:08 -0700
meson: Add support for detecting ossp-uuid without pkg-config
This is necessary as ossp-uuid on windows installs neither a pkg-config nor a
cmake dependency information. Nor is there another supported uuid
implementation available on windows.
Reported-by: Dave Page <dpage@pgadmin.org>
Reviewed-by: Tristan Partin <tristan@partin.io>
Discussion: https://postgr.es/m/20240709065101.xhc74r3mdg2lmn4w@awork3.anarazel.de
Backpatch: 16-, where meson support was added
Greetings,
Andres Freund
On Fri Aug 9, 2024 at 11:14 AM CDT, Andres Freund wrote: > Hi, > > > commit 4d8de281b5834c8f5e0be6ae21e884e69dffd4ce > Author: Heikki Linnakangas <heikki.linnakangas@iki.fi> > Date: 2024-07-27 13:53:11 +0300 > > Fallback to clang in PATH with meson > > Some distributions put clang into a different path than the llvm > binary path. > > For example, this is the case on NixOS / nixpkgs, which failed to find > clang with meson before this patch. > > > I think this is a bad change unfortunately - this way clang and llvm version > can mismatch. Yes, we've done it that way for autoconf, but back then LLVM > broke compatibility far less often. See the attached patch on how we could make this situation better. > commit a00fae9d43e5adabc56e64a4df6d332062666501 > Author: Heikki Linnakangas <heikki.linnakangas@iki.fi> > Date: 2024-07-27 13:53:08 +0300 > > Fallback to uuid for ossp-uuid with meson > > The upstream name for the ossp-uuid package / pkg-config file is > "uuid". Many distributions change this to be "ossp-uuid" to not > conflict with e2fsprogs. > > This lookup fails on distributions which don't change this name, for > example NixOS / nixpkgs. Both "ossp-uuid" and "uuid" are also checked > in configure.ac. > > Author: Wolfgang Walther > Reviewed-by: Nazir Bilal Yavuz, Alvaro Herrera, Peter Eisentraut > Reviewed-by: Tristan Partin > Discussion: https://www.postgresql.org/message-id/ca8f37e1-a2c3-40e2-91f6-59c3d3652ad4@technowledgy.de > Backpatch: 16-, where meson support was added > > I think this is a redundant change with > > commit 2416fdb3ee30bdd2810408f93f14d47bff840fea > Author: Andres Freund <andres@anarazel.de> > Date: 2024-07-20 13:51:08 -0700 > > meson: Add support for detecting ossp-uuid without pkg-config > > This is necessary as ossp-uuid on windows installs neither a pkg-config nor a > cmake dependency information. Nor is there another supported uuid > implementation available on windows. > > Reported-by: Dave Page <dpage@pgadmin.org> > Reviewed-by: Tristan Partin <tristan@partin.io> > Discussion: https://postgr.es/m/20240709065101.xhc74r3mdg2lmn4w@awork3.anarazel.de > Backpatch: 16-, where meson support was added I'm not sure I would call them redundant. It's cheaper (and better) to do a pkg-config lookup than it is to do the various checks in your patch. I think the two patches are complementary. Yours services Windows plus anywhere else that doesn't have a pkg-config file, while Wolfgang's services distros that install the pkg-config with a different name. -- Tristan Partin https://tristan.partin.io
Attachment
Tristan Partin:
> On Fri Aug 9, 2024 at 11:14 AM CDT, Andres Freund wrote:
> [..]
>> commit a00fae9d43e5adabc56e64a4df6d332062666501
>> Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
>> Date: 2024-07-27 13:53:08 +0300
>>
>> Fallback to uuid for ossp-uuid with meson
>> [..]
>>
>> I think this is a redundant change with
>>
>> commit 2416fdb3ee30bdd2810408f93f14d47bff840fea
>> Author: Andres Freund <andres@anarazel.de>
>> Date: 2024-07-20 13:51:08 -0700
>>
>> meson: Add support for detecting ossp-uuid without pkg-config
>> [..]
>
> I'm not sure I would call them redundant. It's cheaper (and better) to
> do a pkg-config lookup than it is to do the various checks in your
> patch. I think the two patches are complementary. Yours services Windows
> plus anywhere else that doesn't have a pkg-config file, while Wolfgang's
> services distros that install the pkg-config with a different name.
Agreed.
There is also a small difference in output for meson: When uuid is
queried via pkg-config, meson also detects the version, so I get this
output:
External libraries
[..]
uuid : YES 1.6.2
Without pkg-config:
External libraries
[..]
uuid : YES
Best,
Wolfgang
Tristan Partin: > On Fri Aug 9, 2024 at 11:14 AM CDT, Andres Freund wrote: >> commit 4d8de281b5834c8f5e0be6ae21e884e69dffd4ce >> Author: Heikki Linnakangas <heikki.linnakangas@iki.fi> >> Date: 2024-07-27 13:53:11 +0300 >> >> Fallback to clang in PATH with meson >> [..] >> >> I think this is a bad change unfortunately - this way clang and llvm >> version >> can mismatch. Yes, we've done it that way for autoconf, but back then >> LLVM >> broke compatibility far less often. > > See the attached patch on how we could make this situation better. Works great. With the correct clang on path: Program clang found: YES 18.1.8 18.1.8 (/nix/store/mr1y1rxkx59dr2bci2akmw2zkbbpmc15-clang-wrapper-18.1.8/bin/clang) With a mismatching version on path: Program /nix/store/x4gwwwlw2ylv0d9vjmkx3dmlcb7gingd-llvm-18.1.8/bin/clang clang found: NO found 16.0.6 but need: '18.1.8' (/nix/store/r85xsa9z0s04n0y21xhrii47bh74g2a8-clang-wrapper-16.0.6/bin/clang) Yes, the match is exact, also fails with a newer version: Program /nix/store/x4gwwwlw2ylv0d9vjmkx3dmlcb7gingd-llvm-18.1.8/bin/clang clang found: NO found 19.1.0 but need: '18.1.8' (/nix/store/rjsfx6sxjpkgd4f9hl9apm0n8dk7jd9w-clang-wrapper-19.1.0-rc2/bin/clang) +1 for this patch. Best, Wolfgang