Do not use duplocale if building for libnix because it isnt supported yet

CMakeLists.txt

@@ -84,6 +84,8 @@ if (${CMAKE_SYSTEM_NAME} STREQUAL "AmigaOS")
             set(NEWLIB ON)
         elseif(${M68K_CRT} STREQUAL "clib2")
             set(CLIB2 ON)
+        elseif(${M68K_CRT} STREQUAL "ixemul")
+            set(IXEMUL ON)
         elseif(${M68K_CRT} STREQUAL "nix20")
             set(NIX20 ON)
         elseif(${M68K_CRT} STREQUAL "nix13")
@@ -205,6 +207,10 @@ endif()
 if (HAVE_LOCALE_H)
     check_symbol_exists(setlocale   "locale.h" HAVE_SETLOCALE)
     check_symbol_exists(uselocale   "locale.h" HAVE_USELOCALE)
+    if (NOT NIX20 AND NOT NIX13)
+        # libnix does not fully support this yet
+        check_symbol_exists(duplocale   "locale.h" HAVE_DUPLOCALE)
+    endif()
 endif()
 
 # uClibc *intentionally* crashes in duplocale(), at least as of:
@@ -379,7 +385,7 @@ if (NOT ("${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "MSVC"))
 
 	# OSX Mach-O doesn't support linking with '-Bsymbolic-functions'.
 	# Others may not support it, too.
-	list(APPEND CMAKE_REQUIRED_LIBRARIES "-Wl,-Bsymbolic-functions")
+	list(APPEND CMAKE_REQUIRED_LIBRARIES "-Wl,-Bsymbolic-functions,-lamiga,-lc")
 	check_c_source_compiles(
 	"
 	int main (void)

README.md

@@ -294,7 +294,7 @@ make
 
 libjson-c.a will get created in the build directory.
 
-You can change newlib to nix20, nix13 or clib2 if you would like to build the library suited for libnix or clib2 instead. Newlib is default.
+You can change newlib to nix20, nix13, ixemul or clib2 if you would like to build the library suited for libnix or clib2 instead. Newlib is default.
 
 ### To build for PowerPC Amiga:
 

cmake/config.h.in

@@ -137,6 +137,9 @@
 /* Define to 1 if you have the `uselocale' function. */
 #cmakedefine HAVE_USELOCALE
 
+/* Define to 1 if you have the `duplocale' function. */
+#cmakedefine HAVE_DUPLOCALE
+
 /* Define to 1 if newlocale() needs freelocale() called on it's `base` argument */
 #cmakedefine NEWLOCALE_NEEDS_FREELOCALE
 

json_tokener.c

@@ -345,6 +345,7 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
 
 #ifdef HAVE_USELOCALE
 	{
+#ifdef HAVE_DUPLOCALE
 		locale_t duploc = duplocale(oldlocale);
 		if (duploc == NULL && errno == ENOMEM)
 		{
@@ -352,16 +353,23 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
 			return NULL;
 		}
 		newloc = newlocale(LC_NUMERIC_MASK, "C", duploc);
+#else
+		newloc = newlocale(LC_NUMERIC_MASK, "C", oldlocale);
+#endif
 		if (newloc == NULL)
 		{
 			tok->err = json_tokener_error_memory;
+#ifdef HAVE_DUPLOCALE
 			freelocale(duploc);
+#endif
 			return NULL;
 		}
 #ifdef NEWLOCALE_NEEDS_FREELOCALE
+#ifdef HAVE_DUPLOCALE
 		// Older versions of FreeBSD (<12.4) don't free the locale
 		// passed to newlocale(), so do it here
 		freelocale(duploc);
+#endif
 #endif
 		uselocale(newloc);
 	}