feat!: make iconv a non-optional dep

12 files changed, 37 insertions, 133 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c83a8dd617..b3ad290c7a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -342,11 +342,6 @@ install_helper(
   FILES ${CMAKE_SOURCE_DIR}/src/man/nvim.1
   DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
 
-option(ENABLE_LIBICONV "enable libiconv" ON)
-if(ENABLE_LIBICONV)
-  find_package(Iconv REQUIRED)
-endif()
-
 #
 # Go down the tree.
 #
diff --git a/cmake.config/CMakeLists.txt b/cmake.config/CMakeLists.txt
index 0ea2124401..6de86cbaf2 100644
--- a/cmake.config/CMakeLists.txt
+++ b/cmake.config/CMakeLists.txt
@@ -51,11 +51,6 @@ check_function_exists(getpwent HAVE_GETPWENT)
 check_function_exists(getpwnam HAVE_GETPWNAM)
 check_function_exists(getpwuid HAVE_GETPWUID)
 check_function_exists(readv HAVE_READV)
-
-if(Iconv_FOUND)
-  set(HAVE_ICONV 1)
-endif()
-
 check_function_exists(opendir HAVE_OPENDIR)
 check_function_exists(readlink HAVE_READLINK)
 check_function_exists(setpgid HAVE_SETPGID)
diff --git a/cmake.config/config.h.in b/cmake.config/config.h.in
index f946fa6124..c8377bf45c 100644
--- a/cmake.config/config.h.in
+++ b/cmake.config/config.h.in
@@ -24,7 +24,6 @@
 #cmakedefine HAVE_GETPWENT
 #cmakedefine HAVE_GETPWNAM
 #cmakedefine HAVE_GETPWUID
-#cmakedefine HAVE_ICONV
 #cmakedefine HAVE_LANGINFO_H
 #cmakedefine HAVE_LOCALE_H
 #cmakedefine HAVE_NL_LANGINFO_CODESET
diff --git a/runtime/doc/news.txt b/runtime/doc/news.txt
index 83272a0d87..853ca23e5d 100644
--- a/runtime/doc/news.txt
+++ b/runtime/doc/news.txt
@@ -45,6 +45,8 @@ The following changes may require adaptations in user config or plugins.
     - `printheader`
     - `printmbcharset`
 
+• libiconv is now a required build dependency.
+
 ==============================================================================
 NEW FEATURES                                                    *news-features*
 
diff --git a/src/nvim/CMakeLists.txt b/src/nvim/CMakeLists.txt
index 725d7987e7..ac067efef9 100755
--- a/src/nvim/CMakeLists.txt
+++ b/src/nvim/CMakeLists.txt
@@ -34,12 +34,9 @@ find_package(LIBVTERM 0.3 REQUIRED)
 target_include_directories(main_lib SYSTEM BEFORE INTERFACE ${LIBVTERM_INCLUDE_DIRS})
 target_link_libraries(main_lib INTERFACE ${LIBVTERM_LIBRARIES})
 
-if(Iconv_FOUND)
-  target_include_directories(main_lib SYSTEM BEFORE INTERFACE ${Iconv_INCLUDE_DIRS})
-  if(Iconv_LIBRARIES)
-    target_link_libraries(main_lib INTERFACE ${Iconv_LIBRARIES})
-  endif()
-endif()
+find_package(Iconv REQUIRED)
+target_include_directories(main_lib SYSTEM BEFORE INTERFACE ${Iconv_INCLUDE_DIRS})
+target_link_libraries(main_lib INTERFACE ${Iconv_LIBRARIES})
 
 option(ENABLE_LIBINTL "enable libintl" ON)
 if(ENABLE_LIBINTL)
diff --git a/src/nvim/eval/funcs.c b/src/nvim/eval/funcs.c
index c64aad659f..5a31288ecd 100644
--- a/src/nvim/eval/funcs.c
+++ b/src/nvim/eval/funcs.c
@@ -3082,9 +3082,7 @@ static void f_has(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
     "fork",
 #endif
     "gettext",
-#if defined(HAVE_ICONV)
     "iconv",
-#endif
     "insert_expand",
     "jumplist",
     "keymap",
diff --git a/src/nvim/fileio.c b/src/nvim/fileio.c
index a4105e379f..9da9d6199e 100644
--- a/src/nvim/fileio.c
+++ b/src/nvim/fileio.c
@@ -118,9 +118,7 @@ struct bw_info {
   int bw_conv_error;             // set for conversion error
   linenr_T bw_conv_error_lnum;   // first line with error or zero
   linenr_T bw_start_lnum;        // line number at start of buffer
-#ifdef HAVE_ICONV
   iconv_t bw_iconv_fd;           // descriptor for iconv() or -1
-#endif
 };
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
@@ -248,11 +246,9 @@ int readfile(char *fname, char *sfname, linenr_T from, linenr_T lines_to_skip,
   char *fenc_next = NULL;        // next item in 'fencs' or NULL
   bool advance_fenc = false;
   long real_size = 0;
-#ifdef HAVE_ICONV
   iconv_t iconv_fd = (iconv_t)-1;       // descriptor for iconv() or -1
   bool did_iconv = false;               // true when iconv() failed and trying
                                         // 'charconvert' next
-#endif
   bool converted = false;                // true if conversion done
   bool notconverted = false;             // true if conversion wanted but it wasn't possible
   char conv_rest[CONV_RESTLEN];
@@ -779,13 +775,11 @@ retry:
     }
   }
 
-#ifdef HAVE_ICONV
   if (iconv_fd != (iconv_t)-1) {
     // aborted conversion with iconv(), close the descriptor
     iconv_close(iconv_fd);
     iconv_fd = (iconv_t)-1;
   }
-#endif
 
   if (advance_fenc) {
     // Try the next entry in 'fileencodings'.
@@ -838,25 +832,17 @@ retry:
       fio_flags = get_fio_flags(fenc);
     }
 
-#ifdef HAVE_ICONV
     // Try using iconv() if we can't convert internally.
     if (fio_flags == 0
         && !did_iconv) {
       iconv_fd = (iconv_t)my_iconv_open("utf-8", fenc);
     }
-#endif
 
     // Use the 'charconvert' expression when conversion is required
     // and we can't do it internally or with iconv().
     if (fio_flags == 0 && !read_stdin && !read_buffer && *p_ccv != NUL
-        && !read_fifo
-#ifdef HAVE_ICONV
-        && iconv_fd == (iconv_t)-1
-#endif
-        ) {
-#ifdef HAVE_ICONV
+        && !read_fifo && iconv_fd == (iconv_t)-1) {
       did_iconv = false;
-#endif
       // Skip conversion when it's already done (retry for wrong
       // "fileformat").
       if (tmpname == NULL) {
@@ -874,11 +860,7 @@ retry:
         }
       }
     } else {
-      if (fio_flags == 0
-#ifdef HAVE_ICONV
-          && iconv_fd == (iconv_t)-1
-#endif
-          ) {
+      if (fio_flags == 0 && iconv_fd == (iconv_t)-1) {
         // Conversion wanted but we can't.
         // Try the next conversion in 'fileencodings'
         advance_fenc = true;
@@ -961,12 +943,9 @@ retry:
         // ucs-4 to utf-8: 4 bytes become up to 6 bytes, size must be
         // multiple of 4
         real_size = (int)size;
-#ifdef HAVE_ICONV
         if (iconv_fd != (iconv_t)-1) {
           size = size / ICONV_MULT;
-        } else {
-#endif
-        if (fio_flags & FIO_LATIN1) {
+        } else if (fio_flags & FIO_LATIN1) {
           size = size / 2;
         } else if (fio_flags & (FIO_UCS2 | FIO_UTF16)) {
           size = (size * 2 / 3) & ~1;
@@ -975,9 +954,7 @@ retry:
         } else if (fio_flags == FIO_UCSBOM) {
           size = size / ICONV_MULT;  // worst case
         }
-#ifdef HAVE_ICONV
-      }
-#endif
+
         if (conv_restlen > 0) {
           // Insert unconverted bytes from previous line.
           memmove(ptr, conv_rest, (size_t)conv_restlen);  // -V614
@@ -1049,11 +1026,7 @@ retry:
             // not be converted.  Truncated file?
 
             // When we did a conversion report an error.
-            if (fio_flags != 0
-#ifdef HAVE_ICONV
-                || iconv_fd != (iconv_t)-1
-#endif
-                ) {
+            if (fio_flags != 0 || iconv_fd != (iconv_t)-1) {
               if (can_retry) {
                 goto rewind_retry;
               }
@@ -1074,23 +1047,17 @@ retry:
               // character if we were converting; if we weren't,
               // leave the UTF8 checking code to do it, as it
               // works slightly differently.
-              if (bad_char_behavior != BAD_KEEP && (fio_flags != 0
-#ifdef HAVE_ICONV
-                                                    || iconv_fd != (iconv_t)-1
-#endif
-                                                    )) {  // NOLINT(whitespace/parens)
+              if (bad_char_behavior != BAD_KEEP && (fio_flags != 0 || iconv_fd != (iconv_t)-1)) {
                 while (conv_restlen > 0) {
                   *(--ptr) = (char)bad_char_behavior;
                   conv_restlen--;
                 }
               }
               fio_flags = 0;  // don't convert this
-#ifdef HAVE_ICONV
               if (iconv_fd != (iconv_t)-1) {
                 iconv_close(iconv_fd);
                 iconv_fd = (iconv_t)-1;
               }
-#endif
             }
           }
         }
@@ -1155,7 +1122,6 @@ retry:
         break;
       }
 
-#ifdef HAVE_ICONV
       if (iconv_fd != (iconv_t)-1) {
         // Attempt conversion of the read bytes to 'encoding' using iconv().
         const char *fromp = ptr;
@@ -1202,7 +1168,6 @@ retry:
         memmove(line_start, buffer, (size_t)linerest);
         size = (top - ptr);
       }
-#endif
 
       if (fio_flags != 0) {
         unsigned int u8c;
@@ -1420,12 +1385,12 @@ retry:
               if (can_retry && !incomplete_tail) {
                 break;
               }
-#ifdef HAVE_ICONV
+
               // When we did a conversion report an error.
               if (iconv_fd != (iconv_t)-1 && conv_error == 0) {
                 conv_error = readfile_linenr(linecnt, ptr, (char *)p);
               }
-#endif
+
               // Remember the first linenr with an illegal byte
               if (conv_error == 0 && illegal_byte == 0) {
                 illegal_byte = readfile_linenr(linecnt, ptr, (char *)p);
@@ -1448,17 +1413,13 @@ retry:
           // Detected a UTF-8 error.
 rewind_retry:
           // Retry reading with another conversion.
-#ifdef HAVE_ICONV
           if (*p_ccv != NUL && iconv_fd != (iconv_t)-1) {
             // iconv() failed, try 'charconvert'
             did_iconv = true;
           } else {
-#endif
-          // use next item from 'fileencodings'
-          advance_fenc = true;
-#ifdef HAVE_ICONV
-        }
-#endif
+            // use next item from 'fileencodings'
+            advance_fenc = true;
+          }
           file_rewind = true;
           goto retry;
         }
@@ -1683,11 +1644,9 @@ failed:
   if (fenc_alloced) {
     xfree(fenc);
   }
-#ifdef HAVE_ICONV
   if (iconv_fd != (iconv_t)-1) {
     iconv_close(iconv_fd);
   }
-#endif
 
   if (!read_buffer && !read_stdin) {
     close(fd);  // errors are ignored
@@ -2233,9 +2192,7 @@ int buf_write(buf_T *buf, char *fname, char *sfname, linenr_T start, linenr_T en
   write_info.bw_conv_error = false;
   write_info.bw_conv_error_lnum = 0;
   write_info.bw_restlen = 0;
-#ifdef HAVE_ICONV
   write_info.bw_iconv_fd = (iconv_t)-1;
-#endif
 
   // After writing a file changedtick changes but we don't want to display
   // the line.
@@ -2996,7 +2953,6 @@ nobackup:
   }
 
   if (converted && wb_flags == 0) {
-#ifdef HAVE_ICONV
     // Use iconv() conversion when conversion is needed and it's not done
     // internally.
     write_info.bw_iconv_fd = (iconv_t)my_iconv_open(fenc, "utf-8");
@@ -3009,28 +2965,21 @@ nobackup:
       }
       write_info.bw_first = true;
     } else {
-#endif
-
-    // When the file needs to be converted with 'charconvert' after
-    // writing, write to a temp file instead and let the conversion
-    // overwrite the original file.
-    if (*p_ccv != NUL) {
-      wfname = vim_tempname();
-      if (wfname == NULL) {  // Can't write without a tempfile!
-        SET_ERRMSG(_("E214: Can't find temp file for writing"));
-        goto restore_backup;
+      // When the file needs to be converted with 'charconvert' after
+      // writing, write to a temp file instead and let the conversion
+      // overwrite the original file.
+      if (*p_ccv != NUL) {
+        wfname = vim_tempname();
+        if (wfname == NULL) {  // Can't write without a tempfile!
+          SET_ERRMSG(_("E214: Can't find temp file for writing"));
+          goto restore_backup;
+        }
       }
     }
   }
 
-#ifdef HAVE_ICONV
-}
-#endif
-
   if (converted && wb_flags == 0
-#ifdef HAVE_ICONV
       && write_info.bw_iconv_fd == (iconv_t)-1
-#endif
       && wfname == fname) {
     if (!forceit) {
       SET_ERRMSG(_("E213: Cannot convert (add ! to write without conversion)"));
@@ -3551,12 +3500,10 @@ nofail:
   }
   xfree(fenc_tofree);
   xfree(write_info.bw_conv_buf);
-#ifdef HAVE_ICONV
   if (write_info.bw_iconv_fd != (iconv_t)-1) {
     iconv_close(write_info.bw_iconv_fd);
     write_info.bw_iconv_fd = (iconv_t)-1;
   }
-#endif
 #ifdef HAVE_ACL
   os_free_acl(acl);
 #endif
@@ -3801,7 +3748,7 @@ static bool time_differs(const FileInfo *file_info, long mtime, long mtime_ns) F
          || file_info->stat.st_mtim.tv_sec - mtime > 1
          || mtime - file_info->stat.st_mtim.tv_sec > 1;
 #else
-         || (long)file_info->stat.st_mtim.tv_sec != mtime;
+         || file_info->stat.st_mtim.tv_sec != mtime;
 #endif
 }
 
@@ -3914,7 +3861,6 @@ static int buf_write_bytes(struct bw_info *ip)
       }
     }
 
-#ifdef HAVE_ICONV
     if (ip->bw_iconv_fd != (iconv_t)-1) {
       const char *from;
       size_t fromlen;
@@ -3973,7 +3919,6 @@ static int buf_write_bytes(struct bw_info *ip)
       buf = ip->bw_conv_buf;
       len = (int)(to - ip->bw_conv_buf);
     }
-#endif
   }
 
   if (ip->bw_fd < 0) {
diff --git a/src/nvim/iconv.h b/src/nvim/iconv.h
index 509f83c415..f5f3f25786 100644
--- a/src/nvim/iconv.h
+++ b/src/nvim/iconv.h
@@ -1,20 +1,18 @@
 #ifndef NVIM_ICONV_H
 #define NVIM_ICONV_H
 
-#include "auto/config.h"
+#include <errno.h>
+#include <iconv.h>
 
-#ifdef HAVE_ICONV
-# include <errno.h>
-# include <iconv.h>
+#include "auto/config.h"
 
 // define some missing constants if necessary
-# ifndef EILSEQ
-#  define EILSEQ 123
-# endif
-# define ICONV_ERRNO errno
-# define ICONV_E2BIG  E2BIG
-# define ICONV_EINVAL EINVAL
-# define ICONV_EILSEQ EILSEQ
+#ifndef EILSEQ
+# define EILSEQ 123
 #endif
+#define ICONV_ERRNO errno
+#define ICONV_E2BIG  E2BIG
+#define ICONV_EINVAL EINVAL
+#define ICONV_EILSEQ EILSEQ
 
 #endif  // NVIM_ICONV_H
diff --git a/src/nvim/lua/stdlib.c b/src/nvim/lua/stdlib.c
index 8b74418753..6ebca6d97e 100644
--- a/src/nvim/lua/stdlib.c
+++ b/src/nvim/lua/stdlib.c
@@ -482,8 +482,6 @@ static int nlua_stricmp(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
   return 1;
 }
 
-#if defined(HAVE_ICONV)
-
 /// Convert string from one encoding to another
 static int nlua_iconv(lua_State *lstate)
 {
@@ -526,8 +524,6 @@ static int nlua_iconv(lua_State *lstate)
   return 1;
 }
 
-#endif
-
 void nlua_state_add_stdlib(lua_State *const lstate, bool is_thread)
 {
   if (!is_thread) {
@@ -574,12 +570,10 @@ void nlua_state_add_stdlib(lua_State *const lstate, bool is_thread)
     luaopen_spell(lstate);
     lua_setfield(lstate, -2, "spell");
 
-#if defined(HAVE_ICONV)
     // vim.iconv
     // depends on p_ambw, p_emoji
     lua_pushcfunction(lstate, &nlua_iconv);
     lua_setfield(lstate, -2, "iconv");
-#endif
   }
 
   // vim.mpack
diff --git a/src/nvim/mbyte.c b/src/nvim/mbyte.c
index 0a0a2080b4..8b50ba719a 100644
--- a/src/nvim/mbyte.c
+++ b/src/nvim/mbyte.c
@@ -2263,8 +2263,6 @@ enc_locale_copy_enc:
   return enc_canonize(buf);
 }
 
-#if defined(HAVE_ICONV)
-
 // Call iconv_open() with a check if iconv() works properly (there are broken
 // versions).
 // Returns (void *)-1 if failed.
@@ -2272,7 +2270,7 @@ enc_locale_copy_enc:
 void *my_iconv_open(char *to, char *from)
 {
   iconv_t fd;
-# define ICONV_TESTLEN 400
+#define ICONV_TESTLEN 400
   char tobuf[ICONV_TESTLEN];
   char *p;
   size_t tolen;
@@ -2386,8 +2384,6 @@ static char *iconv_string(const vimconv_T *const vcp, const char *str, size_t sl
   return result;
 }
 
-#endif  // HAVE_ICONV
-
 /// Setup "vcp" for conversion from "from" to "to".
 /// The names must have been made canonical with enc_canonize().
 /// vcp->vc_type must have been initialized to CONV_NONE.
@@ -2412,11 +2408,9 @@ int convert_setup_ext(vimconv_T *vcp, char *from, bool from_unicode_is_utf8, cha
   int to_is_utf8;
 
   // Reset to no conversion.
-#ifdef HAVE_ICONV
   if (vcp->vc_type == CONV_ICONV && vcp->vc_fd != (iconv_t)-1) {
     iconv_close(vcp->vc_fd);
   }
-#endif
   *vcp = (vimconv_T)MBYTE_NONE_CONV;
 
   // No conversion when one of the names is empty or they are equal.
@@ -2452,9 +2446,7 @@ int convert_setup_ext(vimconv_T *vcp, char *from, bool from_unicode_is_utf8, cha
   } else if (from_is_utf8 && (to_prop & ENC_LATIN9)) {
     // Internal utf-8 -> latin9 conversion.
     vcp->vc_type = CONV_TO_LATIN9;
-  }
-#ifdef HAVE_ICONV
-  else {  // NOLINT(readability/braces)
+  } else {
     // Use iconv() for conversion.
     vcp->vc_fd = (iconv_t)my_iconv_open(to_is_utf8 ? "utf-8" : to,
                                         from_is_utf8 ? "utf-8" : from);
@@ -2463,7 +2455,6 @@ int convert_setup_ext(vimconv_T *vcp, char *from, bool from_unicode_is_utf8, cha
       vcp->vc_factor = 4;       // could be longer too...
     }
   }
-#endif
   if (vcp->vc_type == CONV_NONE) {
     return FAIL;
   }
@@ -2626,11 +2617,9 @@ char *string_convert_ext(const vimconv_T *const vcp, char *ptr, size_t *lenp, si
     }
     break;
 
-#ifdef HAVE_ICONV
   case CONV_ICONV:  // conversion with vcp->vc_fd
     retval = (char_u *)iconv_string(vcp, ptr, len, unconvlenp, lenp);
     break;
-#endif
   }
 
   return (char *)retval;
diff --git a/src/nvim/mbyte_defs.h b/src/nvim/mbyte_defs.h
index 53b01a211f..e913e20f9f 100644
--- a/src/nvim/mbyte_defs.h
+++ b/src/nvim/mbyte_defs.h
@@ -46,9 +46,7 @@ typedef enum {
 typedef struct {
   int vc_type;    ///< Zero or more ConvFlags.
   int vc_factor;  ///< Maximal expansion factor.
-#ifdef HAVE_ICONV
   iconv_t vc_fd;  ///< Value for CONV_ICONV.
-#endif
   bool vc_fail;   ///< What to do with invalid characters: if true, fail,
                   ///< otherwise use '?'.
 } vimconv_T;
diff --git a/src/nvim/version.c b/src/nvim/version.c
index 92122b2523..44f795cdf1 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -63,12 +63,6 @@ static char *features[] = {
   "-acl",
 #endif
 
-#if defined(HAVE_ICONV)
-  "+iconv",
-#else
-  "-iconv",
-#endif
-
   "+tui",
   NULL
 };