add libiconv

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         run: |
           pacman -Syu --needed --noconfirm \
             git unzip ghc cabal-install haskell-shake haskell-aeson-pretty \
-            cmake extra-cmake-modules ninja fmt fcitx5 boost python opencc jdk17-openjdk check
+            cmake extra-cmake-modules ninja fmt fcitx5 boost python opencc jdk17-openjdk check gperf
 
       - name: Fetch source code
         uses: actions/checkout@v4

.gitmodules

@@ -60,3 +60,6 @@
 [submodule "libthai"]
 	path = libthai
 	url = https://github.com/tlwg/libthai
+[submodule "libiconv"]
+	path = libiconv
+	url = https://git.savannah.gnu.org/git/libiconv

README.md

@@ -35,3 +35,4 @@ Cabal is required to build this project.
 * libhangul: [libhangul/libhangul](https://github.com/libhangul/libhangul)
 * libchewing: [chewing/libchewing](https://github.com/chewing/libchewing)
 * libthai: [tlwg/libthai](https://github.com/tlwg/libthai)
+* libiconv: [GNU/libiconv](https://savannah.gnu.org/projects/libiconv)

patches/iconv.h.in.patch

@@ -0,0 +1,26 @@
+24c24
+< extern @DLL_VARIABLE@ int _libiconv_version; /* Likewise */
+---
+> extern  int _libiconv_version; /* Likewise */
+58c58
+< #define EILSEQ @EILSEQ@
+---
+> #define EILSEQ 
+82c82
+< extern size_t iconv (iconv_t cd, @ICONV_CONST@ char* * inbuf, size_t *inbytesleft, char* * outbuf, size_t *outbytesleft);
+---
+> extern size_t iconv (iconv_t cd,  char* * inbuf, size_t *inbytesleft, char* * outbuf, size_t *outbytesleft);
+100,101c100,101
+< #if @USE_MBSTATE_T@
+< #if @BROKEN_WCHAR_H@
+---
+> #if 1
+> #if 0
+121c121
+< #if @USE_MBSTATE_T@
+---
+> #if 1
+168c168
+< #if @HAVE_WCHAR_T@
+---
+> #if 1

patches/libiconv.cmake

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.22.1)
+project(libiconv)
+
+set(LIBICONV_HEADER
+    "include/iconv.h"
+)
+set(LIBICONV_SOURCE
+    lib/iconv.c
+    libcharset/lib/localcharset.c
+)
+
+add_library(iconv STATIC ${LIBICONV_SOURCE})
+target_include_directories(iconv PRIVATE include libcharset/include)
+install(TARGETS iconv)
+install(FILES ${LIBICONV_HEADER} DESTINATION include)