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Remove support for LLVM versions 10-13. The default on all non-EOL'd
OSes represented in our build farm will be at least LLVM 14 when
PostgreSQL 18 ships.
Author: Thomas Munro <thomas.munro@gmail.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/CA%2BhUKGLhNs5geZaVNj2EJ79Dx9W8fyWUU3HxcpZy55sMGcY%3DiA%40mail.gmail.com
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The current method of detecting perl build flags breaks if the path to
perl contains a space. This change makes two improvements. First,
instead of getting a list of ldflags and ccdlflags and then trying to
filter those out of the reported ldopts, we tell perl to suppress
reporting those in the first instance. Second, it tells perl to parse
those and output them, one per line. Thus any space on the option in a
file name, for example, is preserved.
Issue reported off-list by Muralikrishna Bandaru
Discussion: https://postgr.es/01117f88-f465-bf6c-9362-083bd72ca305@dunslane.net
Backpatch to release 16.
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Latest versions of Strawberry Perl define USE_THREAD_SAFE_LOCALE, and we
therefore get a handshake error when building against such instances.
The solution is to perform a test to see if USE_THREAD_SAFE_LOCALE is
defined and only define NO_THREAD_SAFE_LOCALE if it isn't.
Backpatch the meson.build fix back to release 16 and apply the same
logic to Mkvcbuild.pm in releases 12 through 16.
Original report of the issue from Muralikrishna Bandaru.
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OpenSSL 1.0.2 has been EOL from the upstream OpenSSL project for
some time, and is no longer the default OpenSSL version with any
vendor which package PostgreSQL. By retiring support for OpenSSL
1.0.2 we can remove a lot of no longer required complexity for
managing state within libcrypto which is now handled by OpenSSL.
Reviewed-by: Jacob Champion <jacob.champion@enterprisedb.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/ZG3JNursG69dz1lr@paquier.xyz
Discussion: https://postgr.es/m/CA+hUKGKh7QrYzu=8yWEUJvXtMVm_CNWH1L_TLWCbZMwbi1XP2Q@mail.gmail.com
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Use gmtime_r() and localtime_r() instead of gmtime() and localtime(),
for thread-safety.
There are a few affected calls in libpq and ecpg's libpgtypes, which
are probably effectively bugs, because those libraries already claim
to be thread-safe.
There is one affected call in the backend. Most of the backend
otherwise uses the custom functions pg_gmtime() and pg_localtime(),
which are implemented differently.
While we're here, change the call in the backend to gmtime*() instead
of localtime*(), since for that use time zone behavior is irrelevant,
and this side-steps any questions about when time zones are
initialized by localtime_r() vs localtime().
Portability: gmtime_r() and localtime_r() are in POSIX but are not
available on Windows. Windows has functions gmtime_s() and
localtime_s() that can fulfill the same purpose, so we add some small
wrappers around them. (Note that these *_s() functions are also
different from the *_s() functions in the bounds-checking extension of
C11. We are not using those here.)
On MinGW, you can get the POSIX-style *_r() functions by defining
_POSIX_C_SOURCE appropriately before including <time.h>. This leads
to a conflict at least in plpython because apparently _POSIX_C_SOURCE
gets defined in some header there, and then our replacement
definitions conflict with the system definitions. To avoid that sort
of thing, we now always define _POSIX_C_SOURCE on MinGW and use the
POSIX-style functions here.
Reviewed-by: Stepan Neretin <sncfmgg@gmail.com>
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/eba1dc75-298e-4c46-8869-48ba8aad7d70@eisentraut.org
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We don't need configure probes for HAVE_LANGINFO_H (it is implied by
!WIN32), and we don't need to consider systems that have it but don't
define CODESET (that was for OpenBSD in commit 81cca218, but it has now
had it for 19 years).
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Discussion: https://postgr.es/m/CA%2BhUKGJqVe0%2BPv9dvC9dSums_PXxGo9SWcxYAMBguWJUGbWz-A%40mail.gmail.com
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This allows the code to be used by other frontend applications.
Amul Sul, reviewed by Sravan Kumar, Andres Freund (whose input
I specifically solicited regarding the meson.build changes),
and me.
Discussion: http://postgr.es/m/CAAJ_b94StvLWrc_p4q-f7n3OPfr6GhL8_XuAg2aAaYZp1tF-nw@mail.gmail.com
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This warning flag detects global variables not declared in header
files. This is similar to what -Wmissing-prototypes does for
functions. (More correctly, it is similar to what
-Wmissing-declarations does for functions, but -Wmissing-prototypes is
a superset of that in C.)
This flag is new in GCC 14. Clang has supported it for a while.
Several recent commits have cleaned up warnings triggered by this, so
it should now be clean.
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/e0a62134-83da-4ba4-8cdb-ceb0111c95ce@eisentraut.org
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Modern versions of all relevant architectures and tool chains have
atomics support. Since edadeb07, there is no remaining reason to carry
code that simulates atomic flags and uint32 imperfectly with spinlocks.
64 bit atomics are still emulated with spinlocks, if needed, for now.
Any modern compiler capable of implementing C11 <stdatomic.h> must have
the underlying operations we need, though we don't require C11 yet. We
detect certain compilers and architectures, so hypothetical new systems
might need adjustments here.
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> (concept, not the patch)
Reviewed-by: Andres Freund <andres@anarazel.de> (concept, not the patch)
Discussion: https://postgr.es/m/3351991.1697728588%40sss.pgh.pa.us
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A later change will require atomic support, so it wouldn't make sense
for a hypothetical new system not to be able to implement spinlocks.
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> (concept, not the patch)
Reviewed-by: Andres Freund <andres@anarazel.de> (concept, not the patch)
Discussion: https://postgr.es/m/3351991.1697728588%40sss.pgh.pa.us
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To build with -Dreadline=enabled one can use either readline or
libedit. The -Dlibedit_preferred flag is supposed to control the order
of names to lookup. This works fine when either both libraries are
present or -Dreadline is set to auto. However, explicitly enabling
readline with only libedit present, but not setting libedit_preferred,
or alternatively enabling readline with only readline present, but
setting libedit_preferred, too, are both broken. This is because
cc.find_library will throw an error for a not found dependency as soon
as the first required dependency is checked, thus it's impossible to
fallback to the alternative.
Here we only check the second of the two dependencies for
requiredness, thus we only fail when none of the two can be found.
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
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Passing an absolute bindir/libdir will install the binaries and
libraries to <build>/tmp_install/<bindir> and
<build>/tmp_install/<libdir> respectively.
This path is correctly passed to the regression test suite via
configure/make, but not via meson, yet. This is because the "/"
operator in the following expression throws away the whole left side
when the right side is an absolute path:
test_install_location / get_option('libdir')
This was already correctly handled for dir_prefix, which is likely
absolute as well. This patch handles both bindir and libdir in the
same way - prefixing absolute paths with the tmp_install path
correctly.
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
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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.
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
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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
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OpenSSL supports two types of session tickets for TLSv1.3, stateless
and stateful. The option we've used only turns off stateless tickets
leaving stateful tickets active. Use the new API introduced in 1.1.1
to disable all types of tickets.
Backpatch to all supported versions.
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reported-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20240617173803.6alnafnxpiqvlh3g@awork3.anarazel.de
Backpatch-through: v12
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from OpenBSD, similar to strlcat, strlcpy
There are currently no uses, but some will be added soon.
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-by: David Steele <david@pgmasters.net>
Discussion: https://www.postgresql.org/message-id/flat/79692bf9-17d3-41e6-b9c9-fc8c3944222a@eisentraut.org
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Particularly on windows it's useful to look up dependencies via cmake, instead
of pkg-config. Meson supports doing so. Unfortunately the dependency names
used by various projects often differs between their pkg-config and cmake
files.
This would look a lot neater if we could rely on meson >= 0.60.0...
Reviewed-by: Tristan Partin <tristan@partin.io>
Discussion: https://postgr.es/m/20240709065101.xhc74r3mdg2lmn4w@awork3.anarazel.de
Backpatch: 16-, where meson support was added
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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
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This is required as MIT Kerberos does provide neither pkg-config nor cmake
dependency information 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
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These were missing since the initial introduction of the meson based build, in
e6927270cd18. As-is this is unlikely to cause an issue, but a future commit
will add support for detecting gssapi without use of dependency(), which could
fail due to this.
Discussion: https://postgr.es/m/20240708225659.gmyqoosi7km6ysgn@awork3.anarazel.de
Backpatch: 16-, where the meson based build was added
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Let the hacking begin ...
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This changes the import library name from 'postgres.exe.lib' to
'postgres.lib', which is what it was with the old MSVC build system.
Extension builds use that name.
Bug: #18513
Reported-by: Muralikrishna Bandaru <muralikrishna.bandaru@enterprisedb.com>
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Required for Cygwin.
Backpatch to release 16.
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Meson uses warning/debug/optimize flags such as "-Wall", "-g", and
"-O2" automatically based on "--warnlevel" and "--buildtype" options.
And we use "--warning_level=1" and "--buildtype=debugoptimized" by
default.
But we need these flags for Makefile.global (for extensions) and
pg_config, so we need to compute them manually based on the
higher-level options.
Without this change, extensions building using pgxs wouldn't get -Wall
or optimization options.
Author: Sutou Kouhei <kou@clear-code.com>
Discussion: https://www.postgresql.org/message-id/flat/20240122.141139.931086145628347157.kou%40clear-code.com
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The OSSP uuid.h file includes unistd.h, so to use it with MSVC we need to
include the postgres include directories so it picks up our version of
that in src/include/port/win32_msvc. Adjust the meson test accordingly.
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Commit 619bc23a1 changed "make dist" to invoke "git archive",
but hard-wired the call to specify that the HEAD revision should
be packaged. Our tarball building process needs to be able to
specify which git commit to package (notably, for packaging
back branches). While we could make that work with some hackery
to operate in detached-HEAD state, it's a lot nicer just to expose
git archive's ability to specify what to package. Hence, invent
a new make variable PG_GIT_REVISION. This is undocumented, but
so is "make dist".
Also make corresponding changes in the meson scripts. We have no
near-term intention of using that for package building, but it
will likely happen eventually, so stay prepared.
Discussion: https://postgr.es/m/3552543.1713909947@sss.pgh.pa.us
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The checks for
HAVE_DECL_LLVMCREATEGDBREGISTRATIONLISTENER and
HAVE_DECL_LLVMCREATEPERFJITEVENTLISTENER
are in configure but are missing on the meson side. This adds those.
Reported-by: Heikki Linnakangas <hlinnaka@iki.fi>
Discussion: https://www.postgresql.org/message-id/5539b16c-cff7-46d5-9621-c3fb6b549e9e@iki.fi
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The test for pstat was removed from configure by 9db300ce6e3 but not
from meson.build. Do that now.
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Presently, pg_popcount() processes data in 32-bit or 64-bit chunks
when possible. Newer hardware that supports AVX-512 instructions
can use 512-bit chunks, which provides a nice speedup, especially
for larger buffers. This commit introduces the infrastructure
required to detect compiler and CPU support for the required
AVX-512 intrinsic functions, and it adds a new pg_popcount()
implementation that uses these functions. If CPU support for this
optimized implementation is detected at runtime, a function pointer
is updated so that it is used by subsequent calls to pg_popcount().
Most of the existing in-tree calls to pg_popcount() should benefit
from these instructions, and calls with smaller buffers should at
least not regress compared to v16. The new infrastructure
introduced by this commit can also be used to optimize
visibilitymap_count(), but that is left for a follow-up commit.
Co-authored-by: Paul Amonson, Ants Aasma
Reviewed-by: Matthias van de Meent, Tom Lane, Noah Misch, Akash Shankaran, Alvaro Herrera, Andres Freund, David Rowley
Discussion: https://postgr.es/m/BL1PR11MB5304097DF7EA81D04C33F3D1DCA6A%40BL1PR11MB5304.namprd11.prod.outlook.com
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Commit 619bc23a1a introduced
WARNING: Project targets '>=0.54' but uses feature introduced in '0.55.0': Passing executable/found program object to script parameter of add_dist_script
Work around that by wrapping the offending line in a meson version check.
Author: Tristan Partin <tristan@neon.tech>
Discussion: https://www.postgresql.org/message-id/flat/D096Q3NFFVH1.1T5RE4MOO9ZFH%40neon.tech
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This changes "make dist" to directly use "git archive", rather than
the custom shell script it currently runs.
This is to make the creation of the distribution tarball more directly
traceable to the git repository. That is why we removed the "make
distprep" step.
"make dist" continues to produce a .gz and a .bz2 tarball as before.
The archives produced this way are deterministic and reproducible,
meaning for a given commit the result file should always be
bit-for-bit identical. The exception is that if you use a git version
older than 2.38.0, gzip records the platform in the archive, so you'd
get a different output on Windows vs. macOS vs. "UNIX" (everything
else). In git 2.38.0, this was changed so that everything is recorded
as "UNIX" now. This is just something to keep in mind. This issue is
specific to the gzip format, it does not affect other compression
formats.
Meson has its own distribution building command (meson dist), but we
are not using that at this point. The main problem is that, the way
they have implemented it, it is not deterministic in the above sense.
Also, we want a "make" version for the time being. But the target
name "dist" in meson is reserved for that reason, so we call the
custom target "pgdist" (so call something like "meson compile -C build
pgdist").
Reviewed-by: Tristan Partin <tristan@neon.tech>
Discussion: https://www.postgresql.org/message-id/flat/40e80f77-a294-4f29-a16f-e21bc7bc75fc%40eisentraut.org
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Starting with the Sonoma toolchain macos' linker emits warnings when the same
library is linked to twice. That's ill considered, as the same library can be
used by multiple subsidiary libraries. Luckily there's a flag to suppress that
warning.
On Ventura meson's default of -Wl,-undefined,dynamic_lookup caused warnings,
which we suppressed with -Wl,-undefined,error. Unfortunately that causes a
warning on Sonoma, which is absurd, as it's documented linker default. To
avoid that warning, only add -Wl,-undefined,error if it does not trigger
warnings. Luckily dynamic_lookup doesn't trigger a warning on Sonoma anymore.
Discussion: https://postgr.es/m/20231201040515.p5bshhhtfru7d3da@awork3.anarazel.de
Backpatch: 16-, where the meson build was added
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The copy_file_range() system call is available on at least Linux and
FreeBSD, and asks the kernel to use efficient ways to copy ranges of a
file. Options available to the kernel include sharing block ranges
(similar to --clone mode), and pushing down block copies to the storage
layer.
For automated testing, see PG_TEST_PG_UPGRADE_MODE. (Perhaps in a later
commit we could consider setting this mode for one of the CI targets.)
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/CA%2BhUKGKe7Hb0-UNih8VD5UNZy5-ojxFb3Pr3xSBBL8qj2M2%3DdQ%40mail.gmail.com
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There isn't a lot of user demand for AIX support, we have a bunch of
hacks to work around AIX-specific compiler bugs and idiosyncrasies,
and no one has stepped up to the plate to properly maintain it.
Remove support for AIX to get rid of that maintenance overhead. It's
still supported for stable versions.
The acute issue that triggered this decision was that after commit
8af2565248, the AIX buildfarm members have been hitting this
assertion:
TRAP: failed Assert("(uintptr_t) buffer == TYPEALIGN(PG_IO_ALIGN_SIZE, buffer)"), File: "md.c", Line: 472, PID: 2949728
Apperently the "pg_attribute_aligned(a)" attribute doesn't work on AIX
for values larger than PG_IO_ALIGN_SIZE, for a static const variable.
That could be worked around, but we decided to just drop the AIX support
instead.
Discussion: https://www.postgresql.org/message-id/20240224172345.32@rfd.leadboat.com
Reviewed-by: Andres Freund, Noah Misch, Thomas Munro
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Remove support for older LLVM versions. The default on common software
distributions will be at least LLVM 10 when PostgreSQL 17 ships.
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/CA%2BhUKGLhNs5geZaVNj2EJ79Dx9W8fyWUU3HxcpZy55sMGcY%3DiA%40mail.gmail.com
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This appears to be what is missing to support builds on Android (with
meson).
Author: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/CAC7zN94TdsHhY88XkroJzSMx7E%3DBQpV9LKKjNSEnTM04ihoWCA%40mail.gmail.com
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portname is set to host_system, but host_system might still be changed
later in the file. As a consequence, platforms where host_system is
changed later wouldn't find some of their platform-specific files
(driven by portname), and the build would fail. Move the assignment
of portname further down after the last change of host_system (but
before further overriding assignments to portname).
Discussion: https://www.postgresql.org/message-id/flat/CAC7zN94TdsHhY88XkroJzSMx7E%3DBQpV9LKKjNSEnTM04ihoWCA%40mail.gmail.com
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Injection points are a new facility that makes possible for developers
to run custom code in pre-defined code paths. Its goal is to provide
ways to design and run advanced tests, for cases like:
- Race conditions, where processes need to do actions in a controlled
ordered manner.
- Forcing a state, like an ERROR, FATAL or even PANIC for OOM, to force
recovery, etc.
- Arbitrary sleeps.
This implements some basics, and there are plans to extend it more in
the future depending on what's required. Hence, this commit adds a set
of routines in the backend that allows developers to attach, detach and
run injection points:
- A code path calling an injection point can be declared with the macro
INJECTION_POINT(name).
- InjectionPointAttach() and InjectionPointDetach() to respectively
attach and detach a callback to/from an injection point. An injection
point name is registered in a shmem hash table with a library name and a
function name, which will be used to load the callback attached to an
injection point when its code path is run.
Injection point names are just strings, so as an injection point can be
declared and run by out-of-core extensions and modules, with callbacks
defined in external libraries.
This facility is hidden behind a dedicated switch for ./configure and
meson, disabled by default.
Note that backends use a local cache to store callbacks already loaded,
cleaning up their cache if a callback has found to be removed on a
best-effort basis. This could be refined further but any tests but what
we have here was fine with the tests I've written while implementing
these backend APIs.
Author: Michael Paquier, with doc suggestions from Ashutosh Bapat.
Reviewed-by: Ashutosh Bapat, Nathan Bossart, Álvaro Herrera, Dilip
Kumar, Amul Sul, Nazir Bilal Yavuz
Discussion: https://postgr.es/m/ZTiV8tn_MIb_H2rE@paquier.xyz
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Reported-by: Michael Paquier
Discussion: https://postgr.es/m/ZZKTDPxBBMt3C0J9@paquier.xyz
Backpatch-through: 12
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Commit db6d9891e8 changed them to be initialized with --no-locale, but
that reduced the test coverage for non-C locales.
Discussion: https://postgr.es/m/0d47e5ecc037b3908149aad5f2a987793cf938bd.camel%40j-davis.com
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They are only used for some tests. The tests are already set to skip
as appropriate if they are not available.
Discussion: https://www.postgresql.org/message-id/flat/ZQzp_VMJcerM1Cs_%40paquier.xyz
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sed is used only if dtrace or selinux are enabled. Those options are
only used on Unix platforms, which should have sed. But we don't want
to make sed a hard requirement on Windows, which was the case in meson
until now.
This just changes sed to be not-required by meson. If you happen to
use a system with, say, dtrace but without sed, you might get a
slightly complicated error from meson during the build, but that seems
better than making the requiredness a complicated conditional that
will need to be maintained.
Discussion: https://www.postgresql.org/message-id/flat/ZQzp_VMJcerM1Cs_%40paquier.xyz
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This commit removes all the scripts located in src/tools/msvc/ to build
PostgreSQL with Visual Studio on Windows, meson becoming the recommended
way to achieve that. The scripts held some information that is still
relevant with meson, information kept and moved to better locations.
Comments that referred directly to the scripts are removed.
All the documentation still relevant that was in install-windows.sgml
has been moved to installation.sgml under a new subsection for Visual.
All the content specific to the scripts is removed. Some adjustments
for the documentation are planned in a follow-up set of changes.
Author: Michael Paquier
Reviewed-by: Peter Eisentraut, Andres Freund
Discussion: https://postgr.es/m/ZQzp_VMJcerM1Cs_@paquier.xyz
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Reported-by: Junwang Zhao <zhjwpku@gmail.com>
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Commit 252dcb32397f6 introduced initdb template caching to speed up
tests by re-using initdb output. The initdb command didn't however
use the --no-clean option to preserve generated data in case initdb
crashes unlike pg_regress which does do this. This adds the option
to initdb to aid debugging.
While changing the commandline, switch to using long options for
initdb to make the code more self-documenting.
Author: Matthias van de Meent <boekewurm+postgres@gmail.com>
Discussion: https://postgr.es/m/CAEze2WhSTjfK_M+Ea4GSQp8odrEOaQS8HyORd1TJUEiyXaB+rw@mail.gmail.com
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The just released meson 1.3 strongly deprecated a hack we were using, emitting
a noisy warning (the hack basically depended on an implementation detail to
work). Turns out there has been a better way available for a while, I just
hadn't found it. 1.4 added a more convenient approach, but we can't rely on
that.
Reviewed-by: Tristan Partin <tristan@neon.tech>
Discussion: https://postgr.es/m/20231129185053.s6c7f73eg7b4ztfi@awork3.anarazel.de
Backpatch: 16-, where the meson build was added.
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When we look for the Python installation using the meson python
module, we should make it use the python program previously determined
by the 'PYTHON' option. Otherwise, it will just use its own search
and the 'PYTHON' option won't affect it. We need this to be able to
select the Python installation to build PL/Python against.
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/3f5427e8-cef6-474d-ae88-13db1bfdc1a7%40eisentraut.org
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