Use libiconv instead of the system iconv in libretro builds

src/meson.build

@@ -8,10 +8,27 @@ if is_libretro
     global_args += '-DMPG123_NO_LARGENAME'
     global_args += '-DGL_GLES_PROTOTYPES=0'
 
-    global_dependencies += dependency('iconv', static: core_is_static or host_system == 'windows')
-
     global_dependencies += subproject('libretro-common').get_variable('libretro_common')
 
+    uchardet_options = cmake.subproject_options()
+    uchardet_options.add_cmake_defines({
+        'CMAKE_POLICY_VERSION_MINIMUM': '3.10',
+        'CMAKE_C_FLAGS': ' '.join(global_args),
+        'CMAKE_CXX_FLAGS': ' '.join(global_args + global_cpp_args),
+        'CMAKE_POSITION_INDEPENDENT_CODE': use_pic,
+        'BUILD_BINARY': false,
+        'BUILD_SHARED_LIBS': false,
+    })
+    global_dependencies += cmake.subproject('uchardet', options: uchardet_options).dependency('libuchardet')
+
+    libiconv_options = [
+        'cflags=@0@'.format(','.join(global_args)),
+        'cppflags=@0@'.format(','.join(global_args)),
+        'default_library=static',
+        'b_staticpic=@0@'.format(use_pic),
+    ]
+    global_dependencies += subproject('libiconv', default_options: libiconv_options).get_variable('libiconv')
+
     boost_options = cmake.subproject_options()
     boost_options.add_cmake_defines({
         'CMAKE_POLICY_VERSION_MINIMUM': '3.10',
@@ -262,17 +279,6 @@ if is_libretro
         'zlib=disabled',
     ]
     global_dependencies += subproject('freetype', default_options: freetype_options).get_variable('freetype_dep')
-
-    uchardet_options = cmake.subproject_options()
-    uchardet_options.add_cmake_defines({
-        'CMAKE_POLICY_VERSION_MINIMUM': '3.10',
-        'CMAKE_C_FLAGS': ' '.join(global_args),
-        'CMAKE_CXX_FLAGS': ' '.join(global_args + global_cpp_args),
-        'CMAKE_POSITION_INDEPENDENT_CODE': use_pic,
-        'BUILD_BINARY': false,
-        'BUILD_SHARED_LIBS': false,
-    })
-    global_dependencies += cmake.subproject('uchardet', options: uchardet_options).dependency('libuchardet')
 else
     physfs = dependency('physfs', version: '>=2.1', static: build_static)
     openal = dependency('openal', static: build_static, method: 'pkg-config')

subprojects/libiconv.wrap

@@ -0,0 +1,6 @@
+[wrap-file]
+source_url = https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.18.tar.gz
+source_filename = libiconv.tar.gz
+source_hash = 3b08f5f4f9b4eb82f151a7040bfd6fe6c6fb922efe4b1659c66ea933276965e8
+directory = libiconv-1.18
+patch_directory = libiconv

subprojects/packagefiles/libiconv/meson.build

@@ -0,0 +1,50 @@
+project('libiconv', 'c', meson_version: '>=1.3.0')
+
+configuration = {
+    'BROKEN_WCHAR_H': 0,
+    'DLL_VARIABLE': '',
+    'EILSEQ': '',
+    'HAVE_VISIBILITY': meson.get_compiler('c').compiles('__attribute__((__visibility__("default"))) void f(void) {}', name: 'GNU visibility attribute support check') ? 1 : 0,
+    'ICONV_CONST': '',
+    'USE_MBSTATE_T': 0,
+}
+
+libiconv = declare_dependency(
+    include_directories: '.',
+    link_with: library(
+        'iconv',
+        link_with: static_library(
+            'localcharset',
+            c_args: get_option('cflags').split(',') + ['-DBUILDING_LIBCHARSET'],
+            include_directories: 'libcharset/include',
+            sources: [
+                configure_file(
+                    input: 'libcharset/config.h.in',
+                    output: 'config.h',
+                    copy: true,
+                ),
+                'libcharset/lib/localcharset.c',
+            ],
+            pic: get_option('b_staticpic'),
+            gnu_symbol_visibility: 'hidden',
+            install: false,
+        ),
+        c_args: get_option('cflags').split(',') + ['-DBUILDING_LIBICONV', '-DBUILDING_LIBCHARSET', '-DICONV_CONST=' + configuration['ICONV_CONST'], '-DENABLE_EXTRA'],
+        include_directories: 'include',
+        sources: [
+            configure_file(
+                input: 'libcharset/include/localcharset.h.build.in',
+                output: 'localcharset.h',
+                configuration: configuration,
+            ),
+            configure_file(
+                input: 'include/iconv.h.build.in',
+                output: 'iconv.h',
+                configuration: configuration,
+            ),
+            'lib/iconv.c',
+        ],
+        pic: get_option('b_staticpic'),
+        gnu_symbol_visibility: 'hidden',
+    ),
+)

subprojects/packagefiles/libiconv/meson_options.txt

@@ -0,0 +1,2 @@
+option('cflags', type: 'string')
+option('cppflags', type: 'string')