[libiconv] Make built libraries relocatable (#9229)

This is required to build libintl (gettext) with iconv support (see #8484).

Also updated to the latest version 1.16.

ports/libiconv/0001-Add-export-definitions.patch

@@ -1,34 +0,0 @@
-diff --git "a/include/iconv.h.build.in" "b/include/iconv.h.build.in"
-index 0feb068..74e5613 100644
---- "a/include/iconv.h.build.in"	
-+++ "b/include/iconv.h.build.in"
-@@ -27,6 +27,12 @@
- #define LIBICONV_DLL_EXPORTED __attribute__((__visibility__("default")))
-+#elif defined(_WIN32) && @LIBICONV_DYNAMIC@
-+  #if defined(libiconv_EXPORTS)
-+    #define LIBICONV_DLL_EXPORTED __declspec(dllexport)
-+  #else
-+    #define LIBICONV_DLL_EXPORTED __declspec(dllimport)
-+  #endif
- #else
- #define LIBICONV_DLL_EXPORTED
- #endif
- extern LIBICONV_DLL_EXPORTED @DLL_VARIABLE@ int _libiconv_version; /* Likewise */
- 
-diff --git "a/libcharset/include/localcharset.h.build.in" "b/libcharset/include/localcharset.h.build.in"
-index c691359..2a23585 100644
---- "a/libcharset/include/localcharset.h.build.in"	
-+++ "b/libcharset/include/localcharset.h.build.in"
-@@ -24,6 +24,12 @@
- #define LIBCHARSET_DLL_EXPORTED __attribute__((__visibility__("default")))
-+#elif defined(_WIN32) && @LIBICONV_DYNAMIC@
-+  #if defined(libcharset_EXPORTS)
-+    #define LIBCHARSET_DLL_EXPORTED __declspec(dllexport)
-+  #else
-+    #define LIBCHARSET_DLL_EXPORTED __declspec(dllimport)
-+  #endif
- #else
- #define LIBCHARSET_DLL_EXPORTED
- #endif
- 
- 

ports/libiconv/0003-Add-export.patch

@@ -0,0 +1,12 @@
+diff -uNr libiconv-1.16/libcharset/include/libcharset.h.in libiconv-1.16-work/libcharset/include/libcharset.h.in
+--- libiconv-1.16/libcharset/include/libcharset.h.in	2018-09-17 19:07:42.000000000 +0300
++++ libiconv-1.16-work/libcharset/include/libcharset.h.in	2019-12-04 17:15:50.000000000 +0300
+@@ -33,7 +33,7 @@
+    by the corresponding pathname with the current prefix instead.  Both
+    prefixes should be directory names without trailing slash (i.e. use ""
+    instead of "/").  */
+-extern void libcharset_set_relocation_prefix (const char *orig_prefix,
++extern void LIBCHARSET_DLL_EXPORTED libcharset_set_relocation_prefix (const char *orig_prefix,
+                                               const char *curr_prefix);
+ 
+ 

ports/libiconv/CMakeLists.txt

@@ -25,10 +25,31 @@ if(WIN32)
   string(REPLACE "#undef ICONV_CONST" "#define ICONV_CONST const" _contents "${_contents}")
   string(REPLACE "#undef EILSEQ" "" _contents "${_contents}")
   string(REPLACE "#undef WORDS_LITTLEENDIAN" "#define WORDS_LITTLEENDIAN 1" _contents "${_contents}")
+  string(REPLACE "#undef ENABLE_RELOCATABLE" "#define ENABLE_RELOCATABLE 1" _contents "${_contents}")
   file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/config.h" "${_contents}")
 
   configure_file(libcharset/include/localcharset.h.build.in localcharset.h)
+  configure_file(libcharset/include/libcharset.h.in libcharset.h)
   configure_file(include/iconv.h.build.in iconv.h)
+
+  if(MSVC)
+    add_compile_options(/wd4018)
+  endif()
+
+  add_definitions(
+    -D_CRT_SECURE_NO_WARNINGS
+    -DLIBDIR=${LIBDIR}
+    -DINSTALLDIR=${INSTALLDIR}
+    -DNO_XMALLOC=1
+    -DENABLE_RELOCATABLE=1
+    -DIN_LIBRARY=1
+  )
+  if(BUILD_SHARED_LIBS)
+    add_definitions(
+      -DBUILDING_LIBCHARSET=1
+      -DBUILDING_LIBICONV=1
+      -DBUILDING_DLL=1)
+  endif()
 else()
   if(BUILD_SHARED_LIBS)
     set(STATIC_SHARED --enable-shared --disable-static)
@@ -43,19 +64,23 @@ else()
     WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/autoconf
   )
 
-  configure_file(${CMAKE_CURRENT_BINARY_DIR}/autoconf/config.h config.h @ONLY)
+  configure_file(${CMAKE_CURRENT_BINARY_DIR}/autoconf/lib/config.h config.h @ONLY)
   configure_file(${CMAKE_CURRENT_BINARY_DIR}/autoconf/include/iconv.h iconv.h @ONLY)
   configure_file(${CMAKE_CURRENT_BINARY_DIR}/autoconf/libcharset/include/localcharset.h localcharset.h @ONLY)
 endif()
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})
 
-add_definitions(-DLIBDIR -D_CRT_SECURE_NO_WARNINGS)
-
-add_library(libcharset libcharset/lib/localcharset.c)
+add_library(libcharset libcharset/lib/localcharset.c libcharset/lib/relocatable-stub.c)
 target_include_directories(libcharset PUBLIC $<INSTALL_INTERFACE:include>)
 
-add_library(libiconv lib/iconv.c)
+add_library(libiconv lib/iconv.c lib/relocatable.c)
+if(WIN32)
+  target_compile_definitions(libiconv PRIVATE
+                                          -Dset_relocation_prefix=libiconv_set_relocation_prefix
+                                          -Drelocate=libiconv_relocate -Drelocate2=libiconv_relocate2
+  )
+endif()
 target_link_libraries(libiconv PRIVATE libcharset)
 target_include_directories(libiconv PUBLIC $<INSTALL_INTERFACE:include>)
 

ports/libiconv/CONTROL

@@ -1,4 +1,4 @@
 Source: libiconv
-Version: 1.15-6
+Version: 1.16-1
 Homepage: https://www.gnu.org/software/libiconv/
 Description: GNU Unicode text conversion

ports/libiconv/portfile.cmake

@@ -1,26 +1,24 @@
-if(VCPKG_CMAKE_SYSTEM_NAME AND NOT VCPKG_CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+if(NOT VCPKG_TARGET_IS_WINDOWS)
     set(VCPKG_POLICY_EMPTY_PACKAGE enabled)
     file(MAKE_DIRECTORY ${CURRENT_PACKAGES_DIR}/share/unofficial-iconv)
     file(COPY ${CMAKE_CURRENT_LIST_DIR}/unofficial-iconv-config.cmake DESTINATION ${CURRENT_PACKAGES_DIR}/share/unofficial-iconv)
     return()
 endif()
 
-include(vcpkg_common_functions)
-
-set(LIBICONV_VERSION 1.15)
+set(LIBICONV_VERSION 1.16)
 
 vcpkg_download_distfile(ARCHIVE
     URLS "https://ftp.gnu.org/gnu/libiconv/libiconv-${LIBICONV_VERSION}.tar.gz" "https://www.mirrorservice.org/sites/ftp.gnu.org/gnu/libiconv/libiconv-${LIBICONV_VERSION}.tar.gz"
     FILENAME "libiconv-${LIBICONV_VERSION}.tar.gz"
-    SHA512 1233fe3ca09341b53354fd4bfe342a7589181145a1232c9919583a8c9979636855839049f3406f253a9d9829908816bb71fd6d34dd544ba290d6f04251376b1a
+    SHA512 365dac0b34b4255a0066e8033a8b3db4bdb94b9b57a9dca17ebf2d779139fe935caf51a465d17fd8ae229ec4b926f3f7025264f37243432075e5583925bb77b7
 )
 vcpkg_extract_source_archive_ex(
     OUT_SOURCE_PATH SOURCE_PATH
     ARCHIVE ${ARCHIVE}
     REF ${LIBICONV_VERSION}
     PATCHES
-        0001-Add-export-definitions.patch
         0002-Config-for-MSVC.patch
+        0003-Add-export.patch
 )
 
 #Since libiconv uses automake, make and configure, we use a custom CMake file
@@ -29,6 +27,7 @@ file(COPY ${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt DESTINATION ${SOURCE_PATH})
 vcpkg_configure_cmake(
     SOURCE_PATH ${SOURCE_PATH}
     PREFER_NINJA
+    OPTIONS -DINSTALLDIR=\"\" -DLIBDIR=\"\"
     OPTIONS_DEBUG -DDISABLE_INSTALL_HEADERS=ON
 )