meson: use meson.get_compiler() just once

meson.build

@@ -13,6 +13,8 @@ project(
 	],
 )
 
+cpp = meson.get_compiler('cpp')
+
 version = '"@0@"'.format(meson.project_version())
 add_project_arguments('-DWAYFIRE_VERSION=@0@'.format(version), language: 'cpp')
 
@@ -32,7 +34,7 @@ glm            = dependency('glm', required: false)
 libinput       = dependency('libinput', version: '>=1.7.0')
 pixman         = dependency('pixman-1')
 xkbcommon      = dependency('xkbcommon')
-libdl          = meson.get_compiler('cpp').find_library('dl')
+libdl          = cpp.find_library('dl')
 json           = dependency('nlohmann_json', version: '>= 3.11.2')
 udev           = dependency('libudev')
 
@@ -106,11 +108,11 @@ elif get_option('use_system_wfconfig').auto()
 	endif
 endif
 
-if not glm.found() and not meson.get_compiler('cpp').check_header('glm/glm.hpp')
+if not glm.found() and not cpp.check_header('glm/glm.hpp')
   error('GLM not found, and directly using the header \'glm/glm.hpp\' is not possible.')
 endif
 
-backtrace = meson.get_compiler('cpp').find_library('execinfo', required: false)
+backtrace = cpp.find_library('execinfo', required: false)
 
 wfutils = subproject('wf-utils').get_variable('wfutils')
 wftouch = subproject('wf-touch').get_variable('wftouch')
@@ -122,7 +124,7 @@ jpeg = dependency('libjpeg', required: false)
 png  = dependency('libpng',  required: false)
 
 # backtrace() is in a separate library on FreeBSD and Linux with musl
-backtrace = meson.get_compiler('cpp').find_library('execinfo', required: false)
+backtrace = cpp.find_library('execinfo', required: false)
 
 conf_data = configuration_data()
 
@@ -140,8 +142,6 @@ else
   conf_data.set('DEFAULT_CONFIG_BACKEND', get_option('default_config_backend'))
 endif
 
-cpp = meson.get_compiler('cpp')
-
 # needed to dlopen() plugins
 # -E is for RTTI/dynamic_cast across plugins
 add_project_link_arguments(['-rdynamic', '-Wl,-E'], language: 'cpp')

plugins/meson.build

@@ -3,7 +3,6 @@ subdir('common')
 if get_option('custom_pch')
   # Add a workaround for https://github.com/mesonbuild/meson/issues/4350
   # We create a PCH ourselves and manage it for all plugins.
-  cc = meson.get_compiler('cpp')
   pch_file = meson.current_source_dir() / 'pch/plugin_pch.hpp'
   custom_pch_flags = ['@INPUT@', '-c', '-o', '@OUTPUT@', '-MD', '-MF', '@DEPFILE@',
       '-std=' + get_option('cpp_std'), '-pthread', '-fPIC'] + get_option('cpp_args')
@@ -32,18 +31,18 @@ if get_option('custom_pch')
       input: pch_file,
       output: 'plugin_pch.hpp.gch',
       depfile: 'plugin_pch.hpp.d',
-      command: cc.cmd_array() + custom_pch_flags)
+      command: cpp.cmd_array() + custom_pch_flags)
 
   fs = import('fs')
-  if cc.get_id() == 'clang'
+  if cpp.get_id() == 'clang'
     # In clang, everything is simple, we just tell the compiler which PCH file to use
     plugin_pch_arg = ['-include-pch', pch.full_path(), '-pthread']
-  elif cc.get_id() == 'gcc'
+  elif cpp.get_id() == 'gcc'
     # GCC requires that the .gch and the .hpp file are in the same dir.
     fs.copyfile(pch_file) # copy to build dir where .gch is found
     plugin_pch_arg = ['-I' + fs.parent(pch.full_path()), '-include', fs.name(pch_file), '-pthread', '-fpch-preprocess']
   else
-    error('Unsupported compiler for custom pch: ' + cc.get_id())
+    error('Unsupported compiler for custom pch: ' + cpp.get_id())
   endif
 
   plugin_pch_dep = declare_dependency(sources: pch, compile_args: plugin_pch_arg)