subprojects/spp: use meson configuration

subprojects/rzspp/config.h.in

@@ -1,16 +1,10 @@
-#ifndef HAVE_FORK
-#define HAVE_FORK 1
-#endif
+#ifndef SPP_CONFIG_H
+#define SPP_CONFIG_H
 
-#if HAVE_FORK
-# if TARGET_OS_IPHONE || APPLE_SDK_IPHONEOS || APPLE_SDK_IPHONESIMULATOR
-#  define HAVE_SYSTEM 0
-# else
-#  define HAVE_SYSTEM 1
-# endif
-#else
-# define HAVE_SYSTEM 0
-#endif
+// clang-format off
+#define HAVE_SYSTEM                 @HAVE_SYSTEM@
+#define HAVE_FORK                   @HAVE_FORK@
+// clang-format on
 
 #if HAVE_SYSTEM
 #include "p/sh.h"
@@ -34,4 +28,4 @@ struct Proc *procs[] = {
 
 DEFAULT_PROC(spp)
 
-#define DEBUG 0
+#endif

subprojects/rzspp/meson.build

@@ -1,10 +1,6 @@
 project('rzspp', 'c')
 spp_version = '1.2.0'
 
-configure_file(input: 'config.def.h',
-  output: 'config.h',
-  copy: true)
-
 spp_files = [
   'spp.c',
 ]
@@ -19,6 +15,25 @@ librzspp = static_library('rzspp', spp_files,
   implicit_include_directories: false
 )
 
+cc = meson.get_compiler('c')
+
+userconf = configuration_data()
+foreach item : [
+    ['system', '#include <stdlib.h>', []],
+    ['fork', '#include <unistd.h>', []],
+  ]
+  func = item[0]
+  ok = cc.has_function(func, prefix: item[1], dependencies: item[2])
+  userconf.set10('HAVE_@0@'.format(func.to_upper()), ok)
+endforeach
+
+userconf_h_in = files('config.h.in')
+userconf_h = configure_file(
+  input: userconf_h_in,
+  output: 'config.h',
+  configuration: userconf,
+)
+
 spp_static_dep = declare_dependency(
   link_whole: librzspp,
   include_directories: spp_inc,