Remove use_pch option.

Exists as meson builtin `b_pch` (also did before, why did we do this instead???). Empty pch is no longer supported.

Author: HeliumAnt

Source/meson.build

@@ -1,9 +1,4 @@
-
-if use_pch
-  pch = meson.current_source_dir()/'System/StandardIncludes.h'
-else
-  pch = ''
-endif
+pch = meson.current_source_dir()/'System/StandardIncludes.h'
 sources = []
 source_libs = []
 source_inc_dirs += [include_directories(

meson.build

@@ -26,19 +26,6 @@ if get_option('debug') and get_option('b_lto')
   warning('Link time optimization enabled in debug mode, debug symbols may not be fully available. Disable b_lto with "meson configure -Db_lto=false".')
 endif
 
-use_pch = get_option('use_pch').enabled()
-
-if get_option('use_pch').auto()
-  ccache = find_program('ccache', required : false)
-  if ccache.found()
-    message('Detected ccache, disabling precompiled headers')
-    use_pch = false
-  else
-    message('Using precompiled headers')
-    use_pch = true
-  endif
-endif
-
 if compiler.get_argument_syntax()== 'gcc' # used for gcc compatible compilers
   # Build against system libraries on linux
   message('gcc detected')

meson_options.txt

@@ -16,5 +16,3 @@ option('tracy_enable', type: 'boolean', value: true, description: 'Enable Tracy
 option('tracy_callstack', type : 'integer', value : 0, description : 'Enfore callstack collection for tracy regions')
 option('tracy_on_demand', type : 'boolean', value : true, description : 'On-demand profiling')
 option('tracy_debuginfod', type : 'boolean', value : false, description : 'Enable debuginfod support')
-
-option('use_pch', type : 'feature', value : 'auto')