treewide: Bump C++ standard version to C++23

doc/manual/source/installation/prerequisites-source.md

@@ -10,7 +10,7 @@
   - Bash Shell. The `./configure` script relies on bashisms, so Bash is
     required.
 
-  - A version of GCC or Clang that supports C++20.
+  - A version of GCC or Clang that supports C++23.
 
   - `pkg-config` to locate dependencies. If your distribution does not
     provide it, you can get it from

nix-meson-build-support/export/meson.build

@@ -14,7 +14,7 @@ extra_pkg_config_variables = get_variable('extra_pkg_config_variables', {})
 
 extra_cflags = []
 if not meson.project_name().endswith('-c')
-  extra_cflags += [ '-std=c++2a' ]
+  extra_cflags += [ '-std=c++23' ]
 endif
 
 import('pkgconfig').generate(
@@ -34,7 +34,7 @@ meson.override_dependency(
   declare_dependency(
     include_directories : include_dirs,
     link_with : this_library,
-    compile_args : [ '-std=c++2a' ],
+    compile_args : [ '-std=c++23' ],
     dependencies : deps_public_subproject + deps_public,
     variables : extra_pkg_config_variables,
   ),

src/libcmd/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libexpr-c/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libexpr-test-support/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libexpr-test-support/tests/value/context.cc

@@ -1,3 +1,4 @@
+#include <exception> // Needed by rapidcheck on Darwin
 #include <rapidcheck.h>
 
 #include "nix/store/tests/path.hh"

src/libexpr-tests/derived-path.cc

@@ -1,5 +1,6 @@
 #include <nlohmann/json.hpp>
 #include <gtest/gtest.h>
+#include <exception> // Needed by rapidcheck on Darwin
 #include <rapidcheck/gtest.h>
 
 #include "nix/store/tests/derived-path.hh"

src/libexpr-tests/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libexpr/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libfetchers-c/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libfetchers-tests/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libfetchers/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libflake-c/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libflake-tests/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libflake/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libmain-c/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libmain/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libstore-c/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libstore-test-support/derived-path.cc

@@ -1,5 +1,6 @@
 #include <regex>
 
+#include <exception> // Needed by rapidcheck on Darwin
 #include <rapidcheck.h>
 
 #include "nix/store/tests/derived-path.hh"

src/libstore-test-support/include/nix/store/tests/outputs-spec.hh

@@ -1,6 +1,7 @@
 #pragma once
 ///@file
 
+#include <exception> // Needed by rapidcheck on Darwin
 #include <rapidcheck/gen/Arbitrary.h>
 
 #include "nix/store/outputs-spec.hh"

src/libstore-test-support/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libstore-test-support/path.cc

@@ -1,6 +1,7 @@
-#include <rapidcheck/gen/Arbitrary.h>
+#include <exception> // Needed by rapidcheck on Darwin
 #include <regex>
 
+#include <rapidcheck/gen/Arbitrary.h>
 #include <rapidcheck.h>
 
 #include "nix/store/path-regex.hh"

src/libstore-tests/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libstore/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libutil-c/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libutil-test-support/hash.cc

@@ -1,5 +1,6 @@
 #include <regex>
 
+#include <exception> // Needed by rapidcheck on Darwin
 #include <rapidcheck.h>
 
 #include "nix/util/hash.hh"

src/libutil-test-support/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libutil-tests/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/libutil/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

src/nix/meson.build

@@ -3,7 +3,7 @@ project(
   'cpp',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail

tests/functional/meson.build

@@ -2,7 +2,7 @@ project(
   'nix-functional-tests',
   version : files('.version'),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     # TODO(Qyriad): increase the warning level
     'warning_level=1',
     'errorlogs=true', # Please print logs for tests that fail