project: Remove unused defines

meson generates the config.h file with multiple defines to be used
as guards, in the same way as autotools does. However, some of them
are not used.

This patch removes those unused defines.

https://bugzilla.gnome.org/show_bug.cgi?id=790234

meson.build

@@ -62,50 +62,6 @@ foreach define: set_defines
   config_h.set_quoted(define[0], define[1])
 endforeach
 
-# headers
-check_headers = [
-  ['HAVE_DLFCN_H', 'dlfcn.h'],
-  ['HAVE_INTTYPES_H', 'inttypes.h'],
-  ['HAVE_LANGINFO_H', 'langinfo.h'],
-  ['HAVE_LOCALE_H', 'locale.h'],
-  ['HAVE_MEMORY_H', 'memory.h'],
-  ['HAVE_STDINT_H', 'stdint.h'],
-  ['HAVE_STDLIB_H', 'stdlib.h'],
-  ['HAVE_STRINGS_H', 'strings.h'],
-  ['HAVE_STRING_H', 'string.h'],
-  ['HAVE_SYS_STAT_H', 'sys/stat.h'],
-  ['HAVE_SYS_TYPES_H', 'sys/types.h'],
-  ['HAVE_UNISTD_H', 'unistd.h']
-]
-
-foreach header: check_headers
-  config_h.set(header[0], cc.has_header(header[1]))
-endforeach
-
-# functions
-check_functions = [
-  ['HAVE_DCGETTEXT', 'dcgettext'],
-  ['HAVE_GETTEXT', 'gettext'],
-  ['HAVE_FLOOR', 'floor'],
-  ['HAVE_ICONV', 'iconv'],
-  ['HAVE_MEMSET', 'memset'],
-  ['HAVE_NL_LANGINFO', 'nl_langinfo'],
-  ['HAVE_POW', 'pow'],
-  ['HAVE_SETLOCALE', 'setlocale'],
-  ['HAVE_STRSTR', 'strstr']
-]
-
-if host_machine.system().contains('darwin')
-  check_functions += [
-    ['HAVE_CFLOCALECOPYCURRENT', 'CFLocaleCopyCurrent'],
-    ['HAVE_CFPREFERENCESCOPYAPPVALUE', 'CFPreferencesCopyAppValue']
-  ]
-endif
-
-foreach func: check_functions
-  config_h.set(func[0], cc.has_function(func[1]))
-endforeach
-
 assert(cc.has_function('strerror'), '"strerror" not found')
 
 # options
@@ -133,13 +89,11 @@ common_flags = [
   '-DGWEATHER_I_KNOW_THIS_IS_UNSTABLE'
 ]
 
-test_cflags = ['-Wno-sign-compare']
+test_cflags = '-Wno-sign-compare'
 
-foreach cflag: test_cflags
+if cc.has_argument(cflag)
-  if cc.has_argument(cflag)
+  common_flags += [cflag]
-    common_flags += [cflag]
+endif
-  endif
-endforeach
 
 if calendar_debug
   common_flags += [
@@ -180,11 +134,6 @@ geoclue_dep = dependency('libgeoclue-2.0', version: '>=2.4')
 geocode_dep = dependency('geocode-glib-1.0', version: '>=3.23')
 m_dep = cc.find_library('m')
 
-configure_file(
-         output: 'config.h',
-  configuration: config_h
-)
-
 gnome = import('gnome')
 i18n = import('i18n')
 pkg = import('pkgconfig')
@@ -209,6 +158,11 @@ if enable_gtk_doc
   subdir('doc/reference')
 endif
 
+configure_file(
+         output: 'config.h',
+  configuration: config_h
+)
+
 meson.add_install_script('meson_post_install.py')
 
 output = '\n\n      GNOME Calendar ' + calendar_version + '\n'