Explicitly require Meson >= 0.45.0 to build

Closes #117

README.rst

@@ -26,7 +26,7 @@ Dependencies
 Build-only dependencies
 ^^^^^^^^^^^^^^^^^^^^^^^
 
--  meson >= 0.39.0 (build system)
+-  meson >= 0.45.0 (build system)
 -  Python >= 3.4
 -  pkg-config
 -  docutils (optional, for documentation)

meson.build

@@ -13,6 +13,12 @@ project('taisei', 'c',
     ]
 )
 
+meson_required = '0.45.0'
+
+if meson.version().version_compare('<@0@'.format(meson_required))
+    error('Your Meson version is too old: @0@; at least @1@ is required. Please update.'.format(meson.version(), meson_required))
+endif
+
 ver_fb = get_option('version_fallback').strip()
 version_fallback = ver_fb != '' ? ver_fb : meson.project_version()
 
@@ -47,7 +53,7 @@ eolconv = find_program(join_paths(scripts_dir, 'eolconv.py'))
 taisei_version_result = run_command(version_command, '{string}')
 
 if taisei_version_result.stderr() != ''
-    message(taisei_version_result.stderr().strip())
+    warning(taisei_version_result.stderr().strip())
 endif
 
 if taisei_version_result.returncode() != 0

resources/shader/meson.build

@@ -108,10 +108,10 @@ if get_option('validate_glsl') != 'false'
         if test_result.returncode() == 0
             validate_glsl = true
         else
-            message(test_result.stderr())
+            warning(test_result.stderr())
 
             if get_option('validate_glsl') == 'auto'
-                message('glslc test failed, you probably have an incompatible version. GLSL validation will be disabled.')
+                warning('glslc test failed, you probably have an incompatible version. GLSL validation will be disabled.')
             else
                 error('glslc test failed, you probably have an incompatible version.')
             endif

src/meson.build

@@ -9,8 +9,6 @@ version_deps += custom_target('version information',
 if host_machine.system() == 'windows'
     winmod = import('windows')
 
-    # NOTE: this code requires https://github.com/mesonbuild/meson/pull/2815
-
     rcpath = join_paths(meson.current_build_dir(), 'taisei.rc')
     rcdefs = [
         '-DICONS_DIR=@0@'.format(join_paths(meson.source_root(), 'misc', 'icons'))
@@ -54,7 +52,7 @@ if use_intel_intrin
     message('SSE 4.2 intrinsics will be used')
 elif get_option('intel_intrin')
     config.set('TAISEI_BUILDCONF_USE_SSE42', false)
-    message('SSE 4.2 intrinsics can not be used')
+    warning('SSE 4.2 intrinsics can not be used')
 endif
 
 taisei_src = files(