Updated meson build options

meson.build

 project('spdlog', ['cpp'],
-  license         : 'MIT',
-  version         : run_command(find_program('scripts/extract_version.py')).stdout().strip(),
-  default_options : [
+    license         : 'MIT',
+    version         : run_command(find_program('scripts/extract_version.py')).stdout().strip(),
+    default_options : [
     'warning_level=3',
     'cpp_std=c++11',
     'buildtype=release',
     'b_colorout=always',
-  ],
+    ],
 )
 
 # ------------------------
@@ -20,17 +20,57 @@ dep_list += dependency('threads')
 
 # Check for FMT
 if get_option('external_fmt')
-  if not meson.version().version_compare('>=0.49.0')
+    if not meson.version().version_compare('>=0.49.0')
     warning('Finding fmt can fail with meson versions before 0.49.0')
-  endif
-  dep_list     += dependency('fmt')
-  compile_args += '-DSPDLOG_FMT_EXTERNAL'
+    endif
+    dep_list     += dependency('fmt')
+    compile_args += '-DSPDLOG_FMT_EXTERNAL'
 endif
 
 if get_option('no_exceptions')
   compile_args += '-DSPDLOG_NO_EXCEPTIONS'
 endif
 
+if get_option('wchar_support')
+    if build_machine.system() != 'windows'
+        error('wchar_support only supported under windows')
+    endif
+    compile_args += '-DSPDLOG_WCHAR_TO_UTF8_SUPPORT'
+endif
+
+if get_option('wchar_filenames')
+    if build_machine.system() != 'windows'
+        error('wchar_support only supported under windows')
+    endif
+      compile_args += '-DSPDLOG_WCHAR_FILENAMES'
+endif
+
+if get_option('clock_coarse')
+    if build_machine.system() != 'linux'
+        error('clock_coarse only supported under linux')
+    endif
+    compile_args += '-DSPDLOG_CLOCK_COARSE'
+endif
+
+if get_option('prevent_child_fd')
+    compile_args += '-DSPDLOG_PREVENT_CHILD_FD'
+endif
+
+if get_option('no_thread_id')
+    compile_args += '-DSPDLOG_NO_THREAD_ID'
+endif
+
+if get_option('no_tls')
+    compile_args += '-DSPDLOG_NO_TLS'
+endif
+
+if get_option('no_atomic_levels')
+    compile_args += '-DSPDLOG_NO_ATOMIC_LEVELS'
+endif
+
+compile_args_compiled = compile_args + ['-DSPDLOG_COMPILED_LIB']
+compile_args_ho = compile_args
+
 # ------------------------------------
 # ---   Compiled library version   ---
 # ------------------------------------
@@ -50,40 +90,40 @@ if not get_option('external_fmt')
 endif
 
 if get_option('library_type') == 'static'
-  spdlog = static_library(
+    spdlog = static_library(
     'spdlog',
     spdlog_srcs,
-    cpp_args            : [compile_args] + ['-DSPDLOG_COMPILED_LIB'],
+    cpp_args            : compile_args_compiled,
     include_directories : spdlog_inc,
     dependencies        : dep_list,
     install             : not meson.is_subproject()
     )
 else
-  spdlog = shared_library('spdlog',
+    spdlog = shared_library('spdlog',
     spdlog_srcs,
-    cpp_args            : [compile_args] + ['-DSPDLOG_COMPILED_LIB'],
+    cpp_args            : compile_args_compiled,
     include_directories : spdlog_inc,
     dependencies        : dep_list,
     install             : not meson.is_subproject(),
-  )
+    )
 endif
 
 spdlog_dep = declare_dependency(
-  link_with           : spdlog,
-  include_directories : spdlog_inc,
-  compile_args        : compile_args + ['-DSPDLOG_COMPILED_LIB'],
-  dependencies        : dep_list,
-  version             : meson.project_version(),
+      link_with           : spdlog,
+      include_directories : spdlog_inc,
+      compile_args        : compile_args_compiled,
+      dependencies        : dep_list,
+      version             : meson.project_version(),
 )
 
 # ----------------------------------
 # ---   Header only dependency   ---
 # ----------------------------------
 spdlog_headeronly_dep = declare_dependency(
-  include_directories : spdlog_inc,
-  compile_args        : compile_args,
-  dependencies        : dep_list,
-  version             : meson.project_version(),
+    include_directories : spdlog_inc,
+    compile_args        : compile_args_ho,
+    dependencies        : dep_list,
+    version             : meson.project_version(),
 )
 
 # ------------------------
@@ -92,15 +132,15 @@ spdlog_headeronly_dep = declare_dependency(
 
 # Do not install when spdlog is used as a subproject
 if not meson.is_subproject()
-  install_subdir('include/spdlog', install_dir: get_option('includedir'))
+    install_subdir('include/spdlog', install_dir: get_option('includedir'))
 
-  pkg = import('pkgconfig')
-  pkg.generate(spdlog,
+    pkg = import('pkgconfig')
+    pkg.generate(spdlog,
     name         : 'spdlog',
     description  : 'Fast C++ logging library',
     url          : 'https://github.com/gabime/spdlog',
-    extra_cflags : ['-DSPDLOG_COMPILED_LIB']
-  )
+    extra_cflags : compile_args_compiled
+    )
 endif
 
 # -------------------------------------
@@ -108,15 +148,15 @@ endif
 # -------------------------------------
 
 if get_option('enable_tests')
-  subdir('tests')
+    subdir('tests')
 endif
 
 if get_option('enable_examples')
-  subdir('example')
+    subdir('example')
 endif
 
 if get_option('enable_benchmarks')
-  subdir('bench')
+    subdir('bench')
 endif
 
 # -------------------
@@ -124,7 +164,6 @@ endif
 # -------------------
 
 summary_str = '''spdlog build summary:
-
   - using external fmt:  @0@
   - building tests:      @1@
   - building examples:   @2@

meson_options.txt

@@ -3,4 +3,12 @@ option('enable_examples',   type: 'boolean', value: true, description: 'Build ex
 option('enable_benchmarks', type: 'boolean', value: false, description: 'Build benchmarks')
 option('enable_tests',      type: 'boolean', value: true, description: 'Build tests')
 option('library_type',      type: 'combo', choices: ['static', 'shared'], value: 'static', description: 'Library build type')
-option('no_exceptions',      type: 'boolean', value: false, description: 'Disabled exceptions - abort() instead any error')
+option('no_exceptions',     type: 'boolean', value: false, description: 'Disabled exceptions - abort() instead any error')
+
+option('wchar_support',     type: 'boolean', value: false, description:'(Windows only) Support wchar api')
+option('wchar_filenames',   type: 'boolean', value: false, description: '(Windows only) Support wchar filenames')
+option('clock_coarse',      type: 'boolean', value: false, description:  '(Linux only) Use the much faster (but much less accurate) CLOCK_REALTIME_COARSE instead of the regular clock')
+option('prevent_child_fd',  type: 'boolean', value: false, description:  'Prevent from child processes to inherit log file descriptors')
+option('no_thread_id',      type: 'boolean', value: false, description:  'prevent spdlog from querying the thread id on each log call if thread id is not needed')
+option('no_tls',            type: 'boolean', value: false, description:  'prevent spdlog from using thread local storage')
+option('no_atomic_levels',  type: 'boolean', value: false, description:  'prevent spdlog from using of std::atomic log levels (use only if your code never modifies log levels concurrently')