Check if fseeko and realpath exist

Author: rfuest

meson.build

@@ -28,16 +28,33 @@ glib_dep = dependency('glib-2.0', version: glib_req, required: false)
 
 thread_dep = dependency('threads', required: false)
 
-# Generate config.h
+# Check if functions exist
 
 config = configuration_data()
+
+functions = {
+    'fseeko': 'stdio.h',
+    'realpath': 'stdlib.h',
+}
+
+foreach function, include_file : functions
+    exists = cc.has_function(
+        function,
+        args: '-D_GNU_SOURCE',
+        prefix: '#include <@0@>'.format(include_file),
+    )
+    config.set('HAVE_' + function.to_upper(), exists)
+endforeach
+
+# Generate config.h
+
 config.set('FST_WRITER_PARALLEL', thread_dep.found())
 config.set('HAVE_LIBPTHREAD', thread_dep.found())
 
 configure_file(output: 'config.h', configuration: config)
 config_inc = include_directories('.')
 
-add_project_arguments('-DFST_INCLUDE_CONFIG', language : 'c')
+add_project_arguments('-DFST_INCLUDE_CONFIG', language: 'c')
 
 subdir('src')
 subdir('tests')