meson: Increase minimum version to 0.57.2

The previous minimum was to maintain support for Python 3.5, but we
now require Python 3.6 anyway (commit 45363fca63), so that reason is
obsolete.  A small raise to Meson 0.57 allows getting rid of a fair
amount of version conditionals and silences some future-deprecated
warnings.

With the version bump, the following deprecation warnings appeared and
are fixed:

WARNING: Project targets '>=0.57' but uses feature deprecated since '0.55.0': ExternalProgram.path. use ExternalProgram.full_path() instead
WARNING: Project targets '>=0.57' but uses feature deprecated since '0.56.0': meson.build_root. use meson.project_build_root() or meson.global_build_root() instead.

It turns out that meson 0.57.0 and 0.57.1 are buggy for our use, so
the minimum is actually set to 0.57.2.  This is specific to this
version series; in the future we won't necessarily need to be this
precise.

Reviewed-by: Nazir Bilal Yavuz <byavuz81@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/42e13eb0-862a-441e-8d84-4f0fd5f6def0%40eisentraut.org

src/backend/jit/llvm/meson.build

@@ -53,7 +53,7 @@ llvm_irgen_args = [
 
 if ccache.found()
   llvm_irgen_command = ccache
-  llvm_irgen_args = [clang.path()] + llvm_irgen_args
+  llvm_irgen_args = [clang.full_path()] + llvm_irgen_args
 else
   llvm_irgen_command = clang
 endif

src/bin/pg_basebackup/meson.build

@@ -93,9 +93,9 @@ tests += {
   'sd': meson.current_source_dir(),
   'bd': meson.current_build_dir(),
   'tap': {
-    'env': {'GZIP_PROGRAM': gzip.found() ? gzip.path() : '',
-            'TAR': tar.found() ? tar.path() : '',
-            'LZ4': program_lz4.found() ? program_lz4.path() : '',
+    'env': {'GZIP_PROGRAM': gzip.found() ? gzip.full_path() : '',
+            'TAR': tar.found() ? tar.full_path() : '',
+            'LZ4': program_lz4.found() ? program_lz4.full_path() : '',
     },
     'tests': [
       't/010_pg_basebackup.pl',

src/bin/pg_dump/meson.build

@@ -91,9 +91,9 @@ tests += {
   'bd': meson.current_build_dir(),
   'tap': {
     'env': {
-      'GZIP_PROGRAM': gzip.found() ? gzip.path() : '',
-      'LZ4': program_lz4.found() ? program_lz4.path() : '',
-      'ZSTD': program_zstd.found() ? program_zstd.path() : '',
+      'GZIP_PROGRAM': gzip.found() ? gzip.full_path() : '',
+      'LZ4': program_lz4.found() ? program_lz4.full_path() : '',
+      'ZSTD': program_zstd.found() ? program_zstd.full_path() : '',
       'with_icu': icu.found() ? 'yes' : 'no',
     },
     'tests': [

src/bin/pg_verifybackup/meson.build

@@ -23,10 +23,10 @@ tests += {
   'sd': meson.current_source_dir(),
   'bd': meson.current_build_dir(),
   'tap': {
-    'env': {'GZIP_PROGRAM': gzip.found() ? gzip.path() : '',
-            'TAR': tar.found() ? tar.path() : '',
-            'LZ4': program_lz4.found() ? program_lz4.path() : '',
-            'ZSTD': program_zstd.found() ? program_zstd.path() : ''},
+    'env': {'GZIP_PROGRAM': gzip.found() ? gzip.full_path() : '',
+            'TAR': tar.found() ? tar.full_path() : '',
+            'LZ4': program_lz4.found() ? program_lz4.full_path() : '',
+            'ZSTD': program_zstd.found() ? program_zstd.full_path() : ''},
     'tests': [
       't/001_basic.pl',
       't/002_algorithm.pl',

src/include/nodes/meson.build

@@ -28,7 +28,7 @@ node_support_input_i = [
 
 node_support_input = []
 foreach i : node_support_input_i
-  node_support_input += meson.source_root() / 'src' / 'include' / i
+  node_support_input += meson.project_source_root() / 'src' / 'include' / i
 endforeach
 
 node_support_output = [

src/include/pch/meson.build

@@ -1,6 +1,6 @@
 # Copyright (c) 2022-2025, PostgreSQL Global Development Group
 
 # See https://github.com/mesonbuild/meson/issues/10338
-pch_c_h = meson.source_root() / meson.current_source_dir() / 'c_pch.h'
-pch_postgres_h = meson.source_root() / meson.current_source_dir() / 'postgres_pch.h'
-pch_postgres_fe_h = meson.source_root() / meson.current_source_dir() / 'postgres_fe_pch.h'
+pch_c_h = meson.project_source_root() / meson.current_source_dir() / 'c_pch.h'
+pch_postgres_h = meson.project_source_root() / meson.current_source_dir() / 'postgres_pch.h'
+pch_postgres_fe_h = meson.project_source_root() / meson.current_source_dir() / 'postgres_fe_pch.h'

src/makefiles/meson.build

@@ -6,7 +6,7 @@
 
 # Emulation of PGAC_CHECK_STRIP
 strip_bin = find_program(get_option('STRIP'), required: false, native: true)
-strip_cmd = strip_bin.found() ? [strip_bin.path()] : [':']
+strip_cmd = strip_bin.found() ? [strip_bin.full_path()] : [':']
 
 working_strip = false
 if strip_bin.found()
@@ -49,8 +49,8 @@ pgxs_kv = {
   'PORTNAME': portname,
   'PG_SYSROOT': pg_sysroot,
 
-  'abs_top_builddir': meson.build_root(),
-  'abs_top_srcdir': meson.source_root(),
+  'abs_top_builddir': meson.project_build_root(),
+  'abs_top_srcdir': meson.project_source_root(),
 
   'enable_rpath': get_option('rpath') ? 'yes' : 'no',
   'enable_nls': libintl.found() ? 'yes' : 'no',
@@ -123,7 +123,7 @@ pgxs_kv = {
 
 if llvm.found()
   pgxs_kv += {
-    'CLANG': clang.path(),
+    'CLANG': clang.full_path(),
     'CXX': ' '.join(cpp.cmd_array()),
     'LLVM_BINPATH': llvm_binpath,
   }
@@ -258,7 +258,7 @@ pgxs_deps = {
 pgxs_cdata = configuration_data(pgxs_kv)
 
 foreach b, p : pgxs_bins
-  pgxs_cdata.set(b, p.found() ? p.path() : '')
+  pgxs_cdata.set(b, p.found() ? p.full_path() : '')
 endforeach
 
 foreach pe : pgxs_empty

src/pl/plperl/meson.build

@@ -96,7 +96,7 @@ tests += {
       'plperl_transaction',
       'plperl_env',
     ],
-    'regress_args': ['--dlpath', meson.build_root() / 'src/test/regress'],
+    'regress_args': ['--dlpath', meson.project_build_root() / 'src/test/regress'],
   },
 }
 

src/test/modules/injection_points/meson.build

@@ -39,7 +39,7 @@ tests += {
       'reindex_conc',
       'vacuum',
     ],
-    'regress_args': ['--dlpath', meson.build_root() / 'src/test/regress'],
+    'regress_args': ['--dlpath', meson.project_build_root() / 'src/test/regress'],
     # The injection points are cluster-wide, so disable installcheck
     'runningcheck': false,
   },

src/test/modules/oauth_validator/meson.build

@@ -77,7 +77,7 @@ tests += {
       't/002_client.pl',
     ],
     'env': {
-      'PYTHON': python.path(),
+      'PYTHON': python.full_path(),
       'with_libcurl': oauth_flow_supported ? 'yes' : 'no',
       'with_python': 'yes',
     },

src/test/ssl/meson.build

@@ -7,7 +7,7 @@ tests += {
   'tap': {
     'env': {
       'with_ssl': ssl_library,
-      'OPENSSL': openssl.found() ? openssl.path() : '',
+      'OPENSSL': openssl.found() ? openssl.full_path() : '',
     },
     'tests': [
       't/001_ssltests.pl',