Hi,

Sorry, I didn't notice your reply as it is sent to -hackers list only.
Thank you for looking into this!

On Fri, 3 Jul 2026 at 00:50, Zsolt Parragi <[email protected]> wrote:
>
> Everything seems to be properly working with the new version in my
> tests, I only have a few minor comments:
>
> +   <para>
> +    When <productname>PostgreSQL</productname> is built with
> +    <productname>Meson</productname>, it installs a
> +    <literal>pkg-config</literal> file named
> +    <literal>postgresql-&majorversion;-llvm-jit-bitcode.pc</literal>.  It is
> +    used internally to emit <acronym>LLVM</acronym> <acronym>JIT</acronym>
> +    bitcode for the server and for selected
> +    <filename>contrib</filename> modules, and it collects the same
> +    compilation flags that are used to build the server itself.
> +   </para>
>
> Do we want to install these pc files even with -Dllvm=disabled?

I think we want to install them as these pc files can be used for
building extensions.


> diff --git a/src/tools/irlink b/src/tools/irlink
> new file mode 100644
> index 00000000000..6a03e4f5695
> --- /dev/null
> +++ b/src/tools/irlink
>
> Shouldn't this file committed as executable?

Yes, done.


> +import shutil
> +import subprocess
> +import sys
>
> Is shutil and sys used in the script?

They are not used, removed.


v14 is attached.

--
Regards,
Nazir Bilal Yavuz
Microsoft
From 5e02510b7b68f1ca2a20ce6a760f9f05c70cdd69 Mon Sep 17 00:00:00 2001
From: Andres Freund <[email protected]>
Date: Sat, 27 Aug 2022 09:52:03 -0700
Subject: [PATCH v14 1/4] meson: Add postgresql-$version-llvm-jit-bitcode.pc

This .pc file collects the cflags (in particular the include directories)
needed to compile server code, so that the LLVM JIT bitcode emission can
reuse them. It is versioned and intentionally scoped to JIT bitcode only,
since there is not yet agreement on a stable, general extension-build
interface.

Author: Andres Freund <[email protected]>
Author: Nazir Bilal Yavuz <[email protected]>
Reviewed-by: Peter Eisentraut <[email protected]>
Discussion: https://postgr.es/m/206b001d-1884-4081-bd02-bed5c92f02ba%40eisentraut.org
---
 src/backend/meson.build | 117 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)

diff --git a/src/backend/meson.build b/src/backend/meson.build
index f737d799c61..759b53737b2 100644
--- a/src/backend/meson.build
+++ b/src/backend/meson.build
@@ -213,6 +213,123 @@ pg_test_mod_args = pg_mod_args + {
 
 
 
+###############################################################
+# Define a .pc file used when emitting LLVM JIT bitcode
+###############################################################
+
+# Versioned name, so we don't claim a too-general name before there's
+# agreement on a stable interface for building extensions.
+pg_bitcode_pc_name = 'postgresql-@0@-llvm-jit-bitcode'.format(pg_version_major)
+
+pg_ext_vars = []
+pg_ext_vars_inst = []
+pg_ext_vars_uninst = []
+
+pg_ext_cflags = pg_mod_c_args + cppflags
+pg_ext_libs = [backend_mod_deps, thread_dep, ldflags, ldflags_mod]
+pg_ext_subdirs = ['']
+
+# Compute directories to add include directories to the .pc files for.
+# This is a bit more complicated due to port/win32 etc.
+i = 0
+foreach incdir : postgres_inc_d
+  if fs.is_absolute(incdir)
+    # an absolute path from -Dextra_include_dirs
+    pg_ext_cflags += '-I@0@'.format(incdir)
+    continue
+  elif incdir.startswith('src/include')
+    subincdir = dir_include_pkg_rel / 'server' / incdir.split('src/include/').get(1, '')
+  else
+    subincdir = ''
+  endif
+  pg_ext_subdirs += subincdir
+
+  # Add directories in source / build dir containing headers to cflags for the
+  # -uninstalled.pc. Older versions of pkg-config complain if a referenced
+  # variable is not defined, so we emit an empty one for the installed .pc
+  # file.
+  pg_ext_vars += [
+    'build_inc@0@=""'.format(i),
+    'src_inc@0@=""'.format(i),
+  ]
+  pg_ext_vars_uninst += [
+    'build_inc@0@=-I${prefix}/@1@'.format(i, incdir),
+    'src_inc@0@=-I${srcdir}/@1@'.format(i, incdir),
+  ]
+  pg_ext_cflags += [
+    '${build_inc@0@}'.format(i),
+    '${src_inc@0@}'.format(i)
+  ]
+
+  i += 1
+endforeach
+
+
+# We need to have these flags inside the .pc file but it is not very nice
+# since these flags (-fwrapv for example) change the behavior.
+pg_ext_cflags_warn = pg_ext_cflags + cflags_warn
+pg_ext_cflags += cflags
+
+# Directories for extensions to install into
+# TODO: more might be needed
+pg_ext_vars += 'pkglibdir=${prefix}/@0@'.format(dir_lib_pkg)
+pg_ext_vars += 'dir_mod=${pkglibdir}'
+pg_ext_vars += 'dir_data=${prefix}/@0@'.format(dir_data_extension)
+pg_ext_vars += 'dir_include=${prefix}/@0@'.format(dir_include_extension)
+pg_ext_vars += 'dir_doc=${prefix}/@0@'.format(dir_doc_extension)
+pg_ext_vars += 'dir_bitcode=${prefix}/@0@'.format(dir_bitcode)
+# referenced on some platforms, via mod_link_with_dir
+pg_ext_vars += 'bindir=${prefix}/@0@'.format(dir_bin)
+
+# TODO: Define variables making it easy to define tests, too
+
+# Some platforms need linker flags to link with binary, they are the same
+# between building with meson and .pc file, except that we have have to
+# reference a variable to make it work for both normal and -uninstalled .pc
+# files.
+if mod_link_args_fmt.length() != 0
+  assert(link_with_inst != '')
+  assert(link_with_uninst != '')
+
+  # We define mod_link_with_dir as bindir in MacOS but there is already bindir
+  # variable in pg_ext_vars, meson gives warning if we define it again.
+  if not link_with_inst.startswith('${bindir}')
+    pg_ext_vars_inst += 'mod_link_with=@0@'.format(link_with_inst)
+  endif
+  pg_ext_vars_uninst += 'mod_link_with=@0@'.format(link_with_uninst)
+
+  foreach el : mod_link_args_fmt
+    pg_ext_libs += el.format('${mod_link_with}')
+  endforeach
+endif
+
+# main .pc used to emit LLVM JIT bitcode
+pkgconfig.generate(
+  name: pg_bitcode_pc_name,
+  description: 'PostgreSQL LLVM JIT Bitcode Support',
+  url: pg_url,
+
+  subdirs: pg_ext_subdirs,
+  libraries: pg_ext_libs,
+  extra_cflags: pg_ext_cflags,
+
+  variables: pg_ext_vars + pg_ext_vars_inst,
+  uninstalled_variables: pg_ext_vars + pg_ext_vars_uninst,
+)
+
+# a .pc depending on the above, but with all our warnings enabled
+pkgconfig.generate(
+  name: pg_bitcode_pc_name + '-warnings',
+  description: 'PostgreSQL LLVM JIT Bitcode Support with compiler warnings the same as core code',
+  requires: pg_bitcode_pc_name,
+  url: pg_url,
+  extra_cflags: pg_ext_cflags_warn,
+
+  variables: pg_ext_vars + pg_ext_vars_inst,
+  uninstalled_variables: pg_ext_vars + pg_ext_vars_uninst,
+)
+
+
 # Shared modules that, on some system, link against the server binary. Only
 # enter these after we defined the server build.
 
-- 
2.47.3

From c1f564e37c27855e581aacedb29a93f5ff8bf57f Mon Sep 17 00:00:00 2001
From: Nazir Bilal Yavuz <[email protected]>
Date: Thu, 6 Mar 2025 17:46:57 +0300
Subject: [PATCH v14 2/4] meson: Add docs for
 postgresql-$version-llvm-jit-bitcode.pc

Author: Andres Freund <[email protected]>
Author: Nazir Bilal Yavuz <[email protected]>
Reviewed-by: Peter Eisentraut <[email protected]>
Discussion: https://postgr.es/m/206b001d-1884-4081-bd02-bed5c92f02ba%40eisentraut.org
---
 doc/src/sgml/extend.sgml | 98 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 90 insertions(+), 8 deletions(-)

diff --git a/doc/src/sgml/extend.sgml b/doc/src/sgml/extend.sgml
index 63c5ec6d1eb..ac7c2e54d2f 100644
--- a/doc/src/sgml/extend.sgml
+++ b/doc/src/sgml/extend.sgml
@@ -1439,21 +1439,34 @@ include $(PGXS)
    </sect2>
   </sect1>
 
-  <sect1 id="extend-pgxs">
+  <sect1 id="extend-postgres">
    <title>Extension Building Infrastructure</title>
 
-   <indexterm zone="extend-pgxs">
-    <primary>pgxs</primary>
-   </indexterm>
-
    <para>
     If you are thinking about distributing your
     <productname>PostgreSQL</productname> extension modules, setting up a
     portable build system for them can be fairly difficult.  Therefore
     the <productname>PostgreSQL</productname> installation provides a build
-    infrastructure for extensions, called <acronym>PGXS</acronym>, so
-    that simple extension modules can be built simply against an
-    already installed server.  <acronym>PGXS</acronym> is mainly intended
+    infrastructure for extensions, called <literal>PGXS</literal>
+    (<xref linkend="extend-pgxs"/>).
+   </para>
+
+   <para>
+    When <productname>PostgreSQL</productname> is built with
+    <productname>Meson</productname>, it also installs a
+    <literal>pkg-config</literal> file,
+    <literal>postgresql-&majorversion;-llvm-jit-bitcode.pc</literal>
+    (<xref linkend="extend-pkg-config"/>).  This file is used internally to
+    emit <acronym>LLVM</acronym> <acronym>JIT</acronym> bitcode; it is not
+    (yet) a stable, supported interface for building extensions.
+   </para>
+
+  </sect1>
+
+  <sect1 id="extend-pgxs">
+   <title>PGXS</title>
+
+   <para>  <acronym>PGXS</acronym> is mainly intended
     for extensions that include C code, although it can be used for
     pure-SQL extensions too.  Note that <acronym>PGXS</acronym> is not
     intended to be a universal build system framework that can be used
@@ -1929,4 +1942,73 @@ make VPATH=/path/to/extension/source/tree install
    </tip>
   </sect1>
 
+  <sect1 id="extend-pkg-config">
+   <title>postgresql-&majorversion;-llvm-jit-bitcode.pc</title>
+
+   <para>
+    When <productname>PostgreSQL</productname> is built with
+    <productname>Meson</productname>, it installs a
+    <literal>pkg-config</literal> file named
+    <literal>postgresql-&majorversion;-llvm-jit-bitcode.pc</literal>.  It is
+    used internally to emit <acronym>LLVM</acronym> <acronym>JIT</acronym>
+    bitcode for the server and for selected
+    <filename>contrib</filename> modules, and it collects the same
+    compilation flags that are used to build the server itself.
+   </para>
+
+   <para>
+    The file is deliberately versioned and named after its bitcode purpose
+    because there is not yet agreement on a stable, general-purpose interface
+    for building extensions.  It is therefore <emphasis>not</emphasis> a
+    supported replacement for <acronym>PGXS</acronym>
+    (<xref linkend="extend-pgxs"/>), and its name and contents may change
+    between major releases.
+   </para>
+
+   <para>
+    To use the
+    <literal>postgresql-&majorversion;-llvm-jit-bitcode.pc</literal>
+    infrastructure for your extension, you must write a simple
+    <filename>meson.build</filename> file. In the
+    <filename>meson.build</filename> file, you need to include the
+    <literal>postgresql-&majorversion;-llvm-jit-bitcode.pc</literal>
+    <literal>pkg-config</literal> file. Here is an example that builds an
+    extension module named <literal>isbn_issn</literal>, consisting of a
+    shared library containing some C code, an extension control file, an
+    <acronym>SQL</acronym> script, an include file (only needed if other
+    modules might need to access the extension functions without going via
+    <acronym>SQL</acronym>), and a documentation text file:
+<programlisting>
+project('isbn_issn', 'c')
+
+pg_ext = dependency('postgresql-&majorversion;-llvm-jit-bitcode-warnings')
+
+isbn_issn_sources = files('isbn_issn.c')
+
+isbn_issn = shared_module('isbn_issn',
+  isbn_issn_sources,
+  dependencies: pg_ext,
+  install_dir: pg_ext.get_variable(pkgconfig: 'dir_mod'),
+)
+
+install_data(
+     'isbn_issn.control',
+     'isbn_issn--1.0.sql',
+     install_dir: pg_ext.get_variable(pkgconfig: 'dir_data'),
+)
+
+install_headers(
+     'isbn_issn.h',
+     install_dir: pg_ext.get_variable(pkgconfig: 'dir_include'),
+)
+
+install_data(
+     'README.isbn_issn',
+     install_dir: pg_ext.get_variable(pkgconfig: 'dir_doc'),
+)
+</programlisting>
+   </para>
+
+  </sect1>
+
  </chapter>
-- 
2.47.3

From ffc905a3d5840fa63f26ab4ea13c95dd7288404f Mon Sep 17 00:00:00 2001
From: Nazir Bilal Yavuz <[email protected]>
Date: Fri, 7 Mar 2025 12:10:58 +0300
Subject: [PATCH v14 3/4] meson: Add architecture for LLVM bitcode emission

This commit adds support for bitcode emission for backend and extension
source files. These bitcode files are installed into the
$pkglibdir/bitcode/ directory if LLVM is found.

New variable `bitcode_modules` is introduced to generate bitcode files.
All required information is gathered in this variable. Then, this
variable is processed by the main meson LLVM bitcode emission scripts:
src/backend/jit/llvm/bitcode/meson.build -> src/tools/irlink.

An example of a possible structure of bitcode_modules is:
```
bitcode_modules = [
  {
    'name': '...',
    'target': ...,
    'srcfiles': [
      '...',
      '...',
    ],
    'additional_flags': [
      '-I...',
      '-I...',
    ],
  }
]
```

Instead of depending on the generated backend headers explicitly, each
bitcode target lists the corresponding extracted object file as an input.
The command only consumes the source file, but referencing the object
file pulls in its dependencies (e.g. generated headers) without the large
slowdown in build.ninja generation that an explicit depends causes.

Author: Andres Freund <[email protected]>
Author: Nazir Bilal Yavuz <[email protected]>
Author: Diego Fronza <[email protected]>
Reviewed-by: Peter Eisentraut <[email protected]>
Reviewed-by: Diego Fronza <[email protected]>
Reviewed-by: Zsolt Parragi <[email protected]>
Discussion: https://postgr.es/m/206b001d-1884-4081-bd02-bed5c92f02ba%40eisentraut.org
---
 meson.build                              | 21 +++++++++++
 src/backend/jit/llvm/bitcode/meson.build | 47 ++++++++++++++++++++++++
 src/backend/jit/llvm/meson.build         | 40 +++++++++++++-------
 src/backend/meson.build                  |  9 +++++
 src/makefiles/meson.build                |  5 +--
 src/tools/irlink                         | 26 +++++++++++++
 6 files changed, 131 insertions(+), 17 deletions(-)
 create mode 100644 src/backend/jit/llvm/bitcode/meson.build
 create mode 100755 src/tools/irlink

diff --git a/meson.build b/meson.build
index d88a7a70308..738422a97ec 100644
--- a/meson.build
+++ b/meson.build
@@ -937,6 +937,8 @@ if have_cxx
     # Some distros put LLVM and clang in different paths, so fallback to
     # find via PATH, too.
     clang = find_program(llvm_binpath / 'clang', 'clang', required: true)
+    llvm_lto = find_program(llvm_binpath / 'llvm-lto', required: true)
+    irlink = find_program('src/tools/irlink', native: true)
   endif
 else
   msg = 'llvm requires a C++ compiler'
@@ -3381,6 +3383,11 @@ update_unicode_targets = []
 test_deps = []
 tests = []
 
+# List of object files + source files to generated LLVM IR for inlining.
+# Each element is a hash of:
+# {'target': target, 'srcfiles': ..., 'additional_flags': ...}.
+bitcode_modules = []
+
 
 # Default options for targets
 
@@ -3704,6 +3711,11 @@ subdir('src/interfaces/ecpg/test')
 
 subdir('doc/src/sgml')
 
+# generate bitcode for JIT inlining after giving contrib modules etc a chance
+# to add themselves to bitcode_modules[]
+subdir('src/backend/jit/llvm/bitcode', if_found: llvm)
+
+
 generated_sources_ac += {'': ['GNUmakefile']}
 
 # After processing src/test, add test_install_libs to the testprep_targets
@@ -4314,6 +4326,15 @@ summary(
   section: 'Programs',
 )
 
+if llvm.found()
+  summary(
+    {
+      'clang': clang,
+    },
+    section: 'Programs',
+  )
+endif
+
 summary(
   {
     'bonjour': bonjour,
diff --git a/src/backend/jit/llvm/bitcode/meson.build b/src/backend/jit/llvm/bitcode/meson.build
new file mode 100644
index 00000000000..8c0448ea6c6
--- /dev/null
+++ b/src/backend/jit/llvm/bitcode/meson.build
@@ -0,0 +1,47 @@
+# Copyright (c) 2022-2026, PostgreSQL Global Development Group
+#
+# emit LLVM bitcode for JIT inlining
+
+assert(llvm.found())
+
+foreach bitcode_module : bitcode_modules
+  bitcode_targets = []
+  bitcode_obj = bitcode_module['target']
+  bitcode_cflags_local = bitcode_cflags + bitcode_module.get('additional_flags', [])
+  bitcode_name = bitcode_module.get('name', bitcode_obj.name())
+
+  foreach srcfile : bitcode_module['srcfiles']
+    if meson.version().version_compare('>=0.59')
+      srcfilename = fs.parent(srcfile) / fs.name(srcfile)
+    else
+      srcfilename = '@0@'.format(srcfile)
+    endif
+
+    targetname = '@0@_@[email protected]'.format(
+      bitcode_name,
+      srcfilename.underscorify(),
+    )
+    bitcode_targets += custom_target(
+      targetname,
+      # Depend on the bitcode object file's extracted object. Referencing the
+      # object file pulls in its dependencies (e.g. generated headers) without
+      # slowing down the build.
+      input: [srcfile, bitcode_obj.extract_objects(srcfile)],
+      output: targetname,
+      command: [llvm_irgen_command, llvm_irgen_dep_args, bitcode_cflags_local],
+      depfile: targetname + '.d',
+      install: true,
+      install_dir: dir_bitcode,
+    )
+  endforeach
+
+  index_name = '@[email protected]'.format(bitcode_name)
+  bitcode_index = custom_target('@0@'.format(bitcode_name),
+    output: index_name,
+    input: bitcode_targets,
+    command: [irlink, '--lto', llvm_lto, '--outdir', '@OUTDIR@', '--index', index_name, '@INPUT@'],
+    install: true,
+    install_dir: dir_bitcode,
+  )
+  backend_targets += bitcode_index
+endforeach
diff --git a/src/backend/jit/llvm/meson.build b/src/backend/jit/llvm/meson.build
index 7df8453ad6f..c3b5464f8c1 100644
--- a/src/backend/jit/llvm/meson.build
+++ b/src/backend/jit/llvm/meson.build
@@ -42,28 +42,32 @@ backend_targets += llvmjit
 
 # Define a few bits and pieces used here and elsewhere to generate bitcode
 
-llvm_irgen_args = [
-  '-c', '-o', '@OUTPUT@', '@INPUT@',
+llvm_irgen_command = []
+if ccache.found()
+  llvm_irgen_command += ccache
+endif
+
+llvm_irgen_command += [
+  clang,
+  '-c', '-o', '@OUTPUT0@', '@INPUT0@',
   '-flto=thin', '-emit-llvm',
-  '-MD', '-MQ', '@OUTPUT@', '-MF', '@DEPFILE@',
-  '-O2',
   '-Wno-ignored-attributes',
   '-Wno-empty-body',
+  '-Wno-unknown-warning-option',
+  '-Wno-compound-token-split-by-macro',
 ]
-
-if ccache.found()
-  llvm_irgen_command = ccache
-  llvm_irgen_args = [clang.full_path()] + llvm_irgen_args
-else
-  llvm_irgen_command = clang
-endif
+llvm_irgen_dep_args = ['-MD', '-MQ', '@OUTPUT0@', '-MF', '@DEPFILE@']
 
 
 # XXX: Need to determine proper version of the function cflags for clang
-bitcode_cflags = ['-fno-strict-aliasing', '-fwrapv']
-bitcode_cflags += get_option('c_args')
+bitcode_cflags = ['-fno-strict-aliasing', '-fwrapv', '-O2']
 bitcode_cflags += cppflags
 
+var_bitcode_cxxflags = bitcode_cflags
+var_bitcode_cxxflags += get_option('cpp_args')
+bitcode_cflags += get_option('c_args')
+var_bitcode_cflags = bitcode_cflags
+
 # XXX: Worth improving on the logic to find directories here
 bitcode_cflags += '-I@BUILD_ROOT@/src/include'
 bitcode_cflags += '-I@BUILD_ROOT@/src/backend/utils/misc'
@@ -73,7 +77,7 @@ bitcode_cflags += '-I@SOURCE_ROOT@/src/include'
 # Note this is intentionally not installed to bitcodedir, as it's not for
 # inlining
 llvmjit_types = custom_target('llvmjit_types.bc',
-  command: [llvm_irgen_command] + llvm_irgen_args + bitcode_cflags,
+  command: llvm_irgen_command + llvm_irgen_dep_args + bitcode_cflags,
   input: 'llvmjit_types.c',
   output: 'llvmjit_types.bc',
   depends: [postgres],
@@ -82,3 +86,11 @@ llvmjit_types = custom_target('llvmjit_types.bc',
   depfile: '@[email protected]',
 )
 backend_targets += llvmjit_types
+
+# Figure out -I's needed to build all postgres code, including all its
+# dependencies
+pkg_config = find_program(['pkg-config', 'pkgconf'], required: true)
+r = run_command(pkg_config,
+  ['--cflags-only-I', meson.project_build_root() / 'meson-uninstalled/postgresql-@[email protected]'.format(pg_version_major)],
+  check: true)
+bitcode_cflags += r.stdout().split()
diff --git a/src/backend/meson.build b/src/backend/meson.build
index 759b53737b2..2b53265dafe 100644
--- a/src/backend/meson.build
+++ b/src/backend/meson.build
@@ -7,6 +7,9 @@ backend_link_with = [pgport_srv, common_srv]
 generated_backend_sources = []
 post_export_backend_sources = []
 
+var_bitcode_cflags = []
+var_bitcode_cxxflags = []
+
 subdir('access')
 subdir('archive')
 subdir('backup')
@@ -165,6 +168,12 @@ postgres = executable('postgres',
 
 backend_targets += postgres
 
+bitcode_modules += {
+  'name': 'postgres',
+  'target': postgres_lib,
+  'srcfiles': backend_sources,
+}
+
 pg_mod_c_args = cflags_mod
 pg_mod_cxx_args = cxxflags_mod
 pg_mod_link_args = ldflags_sl + ldflags_mod
diff --git a/src/makefiles/meson.build b/src/makefiles/meson.build
index 2401025d1cd..1d09aed1d86 100644
--- a/src/makefiles/meson.build
+++ b/src/makefiles/meson.build
@@ -113,9 +113,8 @@ pgxs_kv = {
     ' '.join(cc.get_supported_link_arguments('-Wl,--export-dynamic')),
   'LDFLAGS_SL': var_ldflags_sl,
 
-  # TODO: requires bitcode generation to be implemented for meson
-  'BITCODE_CFLAGS': '',
-  'BITCODE_CXXFLAGS': '',
+  'BITCODE_CFLAGS': ' '.join(var_bitcode_cflags),
+  'BITCODE_CXXFLAGS': ' '.join(var_bitcode_cxxflags),
 
   'BISONFLAGS': ' '.join(bison_flags),
   'FLEXFLAGS': ' '.join(flex_flags),
diff --git a/src/tools/irlink b/src/tools/irlink
new file mode 100755
index 00000000000..d3e30cc0581
--- /dev/null
+++ b/src/tools/irlink
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+#
+# Link per-source LLVM bitcode files into a single ThinLTO index module
+# (e.g. postgres.index.bc) used for JIT inlining.
+
+import argparse
+import os
+import subprocess
+
+parser = argparse.ArgumentParser(
+    description='generate PostgreSQL JIT IR module')
+
+parser.add_argument('--index', type=str, required=True)
+parser.add_argument('--lto', type=str, required=True)
+parser.add_argument('--outdir', type=str, required=True)
+parser.add_argument('INPUT', type=str, nargs='+')
+
+args = parser.parse_args()
+
+file_names = [os.path.basename(f) for f in args.INPUT]
+command = [args.lto,
+           '-thinlto', '-thinlto-action=thinlink',
+           '-o', args.index] + file_names
+res = subprocess.run(command, cwd=args.outdir)
+
+exit(res.returncode)
-- 
2.47.3

From 444e4931400c4edc8d5ce78662c5863fa3220128 Mon Sep 17 00:00:00 2001
From: Nazir Bilal Yavuz <[email protected]>
Date: Mon, 6 Jul 2026 16:02:06 +0300
Subject: [PATCH v14 4/4] meson: Add LLVM bitcode emissions for contrib
 libraries

The libraries for which bitcode files are generated are selected
manually. Bitcode is only worthwhile for extensions that provide
lightweight SQL operators/functions that can benefit from being inlined
into JIT-compiled expressions, so this is restricted to citext, hstore,
intarray, ltree and pg_trgm.

Author: Andres Freund <[email protected]>
Author: Nazir Bilal Yavuz <[email protected]>
Author: Diego Fronza <[email protected]>
Reviewed-by: Peter Eisentraut <[email protected]>
Reviewed-by: Diego Fronza <[email protected]>
Reviewed-by: Zsolt Parragi <[email protected]>
Discussion: https://postgr.es/m/206b001d-1884-4081-bd02-bed5c92f02ba%40eisentraut.org
---
 contrib/citext/meson.build   | 5 +++++
 contrib/hstore/meson.build   | 5 +++++
 contrib/intarray/meson.build | 5 +++++
 contrib/ltree/meson.build    | 9 +++++++++
 contrib/pg_trgm/meson.build  | 5 +++++
 5 files changed, 29 insertions(+)

diff --git a/contrib/citext/meson.build b/contrib/citext/meson.build
index 1cc49fc999f..fc29fc843f5 100644
--- a/contrib/citext/meson.build
+++ b/contrib/citext/meson.build
@@ -30,6 +30,11 @@ install_data(
   kwargs: contrib_data_args,
 )
 
+bitcode_modules += {
+  'target': citext,
+  'srcfiles': citext_sources,
+}
+
 tests += {
   'name': 'citext',
   'sd': meson.current_source_dir(),
diff --git a/contrib/hstore/meson.build b/contrib/hstore/meson.build
index 6175abc708e..37a23bca0e3 100644
--- a/contrib/hstore/meson.build
+++ b/contrib/hstore/meson.build
@@ -43,6 +43,11 @@ install_headers(
   install_dir: dir_include_extension / 'hstore',
 )
 
+bitcode_modules += {
+  'target': hstore,
+  'srcfiles': hstore_sources,
+}
+
 tests += {
   'name': 'hstore',
   'sd': meson.current_source_dir(),
diff --git a/contrib/intarray/meson.build b/contrib/intarray/meson.build
index e49ff77f167..24ba3110371 100644
--- a/contrib/intarray/meson.build
+++ b/contrib/intarray/meson.build
@@ -33,6 +33,11 @@ install_data(
   kwargs: contrib_data_args,
 )
 
+bitcode_modules += {
+  'target': intarray,
+  'srcfiles': intarray_sources,
+}
+
 tests += {
   'name': 'intarray',
   'sd': meson.current_source_dir(),
diff --git a/contrib/ltree/meson.build b/contrib/ltree/meson.build
index f78521bfe55..b02a133ec58 100644
--- a/contrib/ltree/meson.build
+++ b/contrib/ltree/meson.build
@@ -41,6 +41,15 @@ install_headers(
   install_dir: dir_include_extension / 'ltree',
 )
 
+ltree_dir = meson.current_source_dir()
+bitcode_modules += {
+  'target': ltree,
+  'srcfiles': ltree_sources,
+  'additional_flags': [
+    '-I@0@'.format(ltree_dir)
+  ]
+}
+
 tests += {
   'name': 'ltree',
   'sd': meson.current_source_dir(),
diff --git a/contrib/pg_trgm/meson.build b/contrib/pg_trgm/meson.build
index 3ecf95ba862..31b79db7c57 100644
--- a/contrib/pg_trgm/meson.build
+++ b/contrib/pg_trgm/meson.build
@@ -32,6 +32,11 @@ install_data(
   kwargs: contrib_data_args,
 )
 
+bitcode_modules += {
+  'target': pg_trgm,
+  'srcfiles': pg_trgm_sources,
+}
+
 tests += {
   'name': 'pg_trgm',
   'sd': meson.current_source_dir(),
-- 
2.47.3

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