Merge pull request #847 from sacredbanana/amiga

Add support for Commodore Amiga

.gitignore

@@ -10,6 +10,7 @@
 *.save
 *.autosav
 *.autosave
+.DS_Store
 
 # Tests
 /tests/Makefile

CMakeLists.txt

@@ -45,10 +45,6 @@ include(CMakePackageConfigHelpers)
 option(BUILD_SHARED_LIBS  "Default to building shared libraries" ON)
 option(BUILD_STATIC_LIBS  "Default to building static libraries" ON)
 
-if (BUILD_SHARED_LIBS)
-    add_definitions(-D JSON_C_DLL)
-endif()
-
 # Generate a release merge and test it to verify the correctness of republishing the package.
 ADD_CUSTOM_TARGET(distcheck
 COMMAND make package_source
@@ -73,12 +69,57 @@ option(DISABLE_JSON_PATCH             "Disable JSON patch (RFC6902) support."
 option(NEWLOCALE_NEEDS_FREELOCALE     "Work around newlocale bugs in old FreeBSD by calling freelocale"  OFF)
 option(BUILD_APPS                     "Default to building apps" ON)
 
+if (AMIGA)
+    set(DISABLE_THREAD_LOCAL_STORAGE ON)
+    set(ENABLE_THREADING OFF)
+    set(BUILD_SHARED_LIBS OFF)
+    set(BUILD_APPS OFF)
+    set(DISABLE_STATIC_FPIC ON)
+    if ($ENV{CROSS_PFX} STREQUAL "m68k-amigaos")
+        set(AMIGA_M68K ON)
+        set(BUILD_TESTING OFF)
+        if (${M68K_CRT} STREQUAL "newlib")
+            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")
+            set(NIX13 ON)
+        else()
+            set(NEWLIB ON)
+        endif()
+        message(STATUS "Building for Motorola 68k AmigaOS using CRT: ${M68K_CRT}")
+    elseif ($ENV{CROSS_PFX} STREQUAL "ppc-amigaos")
+        set(AMIGA_PPC ON)
+        message(STATUS "Building for PowerPC AmigaOS")
+    elseif($ENV{CROSS_PFX} STREQUAL "ppc-morphos")
+        set(MORPHOS ON)
+        if (NOIXEMUL)
+            message(STATUS "Building for PowerPC MorphOS without ixemul")
+            set(DISABLE_WERROR ON)
+            set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -noixemul")
+        else()
+            message(STATUS "Building for PowerPC MorphOS with ixemul")
+        endif()
+    else()
+        message(FATAL_ERROR "Unsupported AmigaOS target")
+    endif()
+else()
+    message(STATUS "Building for ${CMAKE_SYSTEM_NAME}")
+endif()
 
-if (UNIX OR MINGW OR CYGWIN)
+if (UNIX OR MINGW OR CYGWIN OR AMIGA)
     list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
 endif()
 
-if (UNIX)
+if (BUILD_SHARED_LIBS)
+    add_definitions(-D JSON_C_DLL)
+endif()
+
+if (UNIX OR AMIGA)
     list(APPEND CMAKE_REQUIRED_LIBRARIES   m)
 endif()
 
@@ -136,7 +177,7 @@ endif()
 check_symbol_exists(_isnan          "float.h" HAVE_DECL__ISNAN)
 check_symbol_exists(_finite         "float.h" HAVE_DECL__FINITE)
 
-if ((MSVC AND NOT (MSVC_VERSION LESS 1800)) OR MINGW OR CYGWIN OR UNIX)
+if ((MSVC AND NOT (MSVC_VERSION LESS 1800)) OR MINGW OR CYGWIN OR UNIX OR AMIGA)
     check_symbol_exists(INFINITY    "math.h" HAVE_DECL_INFINITY)
     check_symbol_exists(isinf       "math.h" HAVE_DECL_ISINF)
     check_symbol_exists(isnan       "math.h" HAVE_DECL_ISNAN)
@@ -144,22 +185,23 @@ if ((MSVC AND NOT (MSVC_VERSION LESS 1800)) OR MINGW OR CYGWIN OR UNIX)
 endif()
 
 check_symbol_exists(_doprnt         "stdio.h" HAVE_DOPRNT)
-if (UNIX OR MINGW OR CYGWIN)
+if (UNIX OR MINGW OR CYGWIN OR AMIGA)
     check_symbol_exists(snprintf    "stdio.h" HAVE_SNPRINTF)
 endif()
 check_symbol_exists(vasprintf       "stdio.h" HAVE_VASPRINTF)
 check_symbol_exists(vsnprintf       "stdio.h" HAVE_VSNPRINTF)
 check_symbol_exists(vprintf         "stdio.h" HAVE_VPRINTF)
-
-check_symbol_exists(arc4random      "stdlib.h" HAVE_ARC4RANDOM)
+if (NOT AMIGA_M68K)
+    check_symbol_exists(arc4random      "stdlib.h" HAVE_ARC4RANDOM)
+endif()
 if (NOT HAVE_ARC4RANDOM AND DISABLE_EXTRA_LIBS STREQUAL "OFF")
     check_include_file(bsd/stdlib.h HAVE_BSD_STDLIB_H)
     if (HAVE_BSD_STDLIB_H)
-		list(APPEND CMAKE_REQUIRED_LIBRARIES "bsd")
-		unset(HAVE_ARC4RANDOM CACHE)
+        list(APPEND CMAKE_REQUIRED_LIBRARIES "bsd")
+        unset(HAVE_ARC4RANDOM CACHE)
         check_symbol_exists(arc4random   "bsd/stdlib.h" HAVE_ARC4RANDOM)
         if (NOT HAVE_ARC4RANDOM)
-			list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "bsd")
+            list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "bsd")
         endif()
     endif()
 endif()
@@ -173,6 +215,10 @@ 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:
@@ -298,6 +344,9 @@ if ("${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "GNU" OR "${CMAKE_C_COMPILER
 	if ("${DISABLE_WERROR}" STREQUAL "OFF")
 	    set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Werror")
 	endif()
+    if (AMIGA_M68K)
+        set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -fbaserel")
+    endif()
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Wall")
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Wcast-qual")
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Wno-error=deprecated-declarations")

README.md

@@ -12,8 +12,9 @@ json-c
 5. [Testing](#testing)
 6. [Building with `vcpkg`](#buildvcpkg)
 7. [Building for Android](#android)
-7. [Linking to libjson-c](#linking)
-8. [Using json-c](#using)
+8. [Building for Commodore Amiga or MorphOS](#amiga)
+9. [Linking to libjson-c](#linking)
+10. [Using json-c](#using)
 
 <a name="overview"></a>
 JSON-C - A JSON implementation in C
@@ -270,6 +271,63 @@ cmake \
 make install
 ```
 
+<a name="amiga"></a>
+Building for Commodore Amiga or MorphOS
+----------------------
+
+Building for Commodore Amiga is supported for both Motorola 68k (AmigaOS 3) and PowerPC (AmigaOS 4) architectures. MorphOS on compatible PowerPC hardware is also supported. You can set up a cross compiler locally, however it is much easier to use the already preconfigured Amiga development environment wtthin a Docker container.
+
+Install Docker on your machine if you don't already have it. You can download Docker Desktop for Windows/macOS/Linux [here](https://www.docker.com/products/docker-desktop/).
+
+### To build for Motorola 68k Amiga:
+
+```
+mkdir build
+docker run --rm \
+    -v ${PWD}:/work \
+    -e USER=$( id -u ) -e GROUP=$( id -g ) \
+    -it  sacredbanana/amiga-compiler:m68k-amigaos bash
+cd build
+cmake -DM68K_CRT=newlib ..
+make
+```
+
+libjson-c.a will get created in the build directory.
+
+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:
+
+```
+mkdir build
+docker run --rm \
+    -v ${PWD}:/work \
+    -e USER=$( id -u ) -e GROUP=$( id -g ) \
+    -it  sacredbanana/amiga-compiler:ppc-amigaos bash
+cd build
+cmake ..
+make
+```
+
+libjson-c.a will get created in the build directory.
+
+### To build for PowerPC MorphOS:
+
+```
+mkdir build
+docker run --rm \
+    -v ${PWD}:/work \
+    -e USER=$( id -u ) -e GROUP=$( id -g ) \
+    -it  sacredbanana/amiga-compiler:ppc-morphos bash
+cd build
+cmake -DNOIXEMUL=1 ..
+make
+```
+
+If you are making an application that absolutely requires ixemul, then remove the `-DNOIXEMUL=1`.
+
+libjson-c.a will get created in the build directory.
+
 <a name="linking"></a>
 Linking to `libjson-c`
 ----------------------

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);
 	}