use patched iconv

Dockerfile

@@ -5,7 +5,7 @@ ENV FPMGROUP nginx
 
 ENV VERSION 10.0.1
 
-RUN apk add --no-cache openssl tar nginx postgresql-client
+RUN apk add --no-cache openssl tar nginx postgresql-client libtool g++ make
 
 RUN apk add --no-cache --repository http://dl-3.alpinelinux.org/alpine/edge/main/ --allow-untrusted \
     libressl2.4-libcrypto \
@@ -41,6 +41,20 @@ RUN apk add --no-cache --repository http://dl-3.alpinelinux.org/alpine/edge/test
 
 RUN ln -s /usr/bin/php7 /usr/bin/php
 
+RUN rm /usr/bin/iconv
+RUN mkdir /tmp/iconv
+RUN wget -qO- https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.14.tar.gz | tar xz -C /tmp/iconv --strip 1 
+
+WORKDIR /tmp/iconv
+ADD libiconv-1-fixes.patch /tmp/iconv/libiconv-1-fixes.patch
+RUN ./configure --prefix=/usr/local
+RUN patch -p1 -u < libiconv-1-fixes.patch
+RUN make && make install
+RUN libtool --finish /usr/local/lib
+RUN rm -r /tmp/iconv
+
+ENV LD_PRELOAD /usr/local/lib/preloadable_libiconv.so
+
 RUN mkdir /var/lib/nextcloud
 RUN wget -qO- https://download.nextcloud.com/server/releases/nextcloud-$VERSION.tar.bz2 | tar xj -C /var/lib/nextcloud --strip 1
 
@@ -51,7 +65,7 @@ RUN chmod +x /var/lib/nextcloud/occ
 
 RUN mkdir /run/nginx
 
-RUN apk del tar
+RUN apk del tar libtool g++ make
 
 ADD /rootfs /
 

libiconv-1-fixes.patch

@@ -0,0 +1,46 @@
+This file is part of MXE.
+See index.html for further information.
+
+Contains ad hoc patches for cross building.
+
+From 47345f5dcfb91da8afed7c4e6c29faa2056db447 Mon Sep 17 00:00:00 2001
+From: MXE
+Date: Fri, 7 Jun 2013 17:44:24 +1000
+Subject: [PATCH] remove gets since c++11 removed it
+ https://lists.gnu.org/archive/html/bug-gnulib/2012-03/msg00186.html
+
+
+diff --git a/srclib/stdio.in.h b/srclib/stdio.in.h
+index 473c84c..dfb59eb 100644
+--- a/srclib/stdio.in.h
++++ b/srclib/stdio.in.h
+@@ -679,22 +679,11 @@ _GL_WARN_ON_USE (getline, "getline is unportable - "
+ # endif
+ #endif
+ 
+-#if @GNULIB_GETS@
+-# if @REPLACE_STDIO_READ_FUNCS@ && @GNULIB_STDIO_H_NONBLOCKING@
+-#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+-#   undef gets
+-#   define gets rpl_gets
+-#  endif
+-_GL_FUNCDECL_RPL (gets, char *, (char *s) _GL_ARG_NONNULL ((1)));
+-_GL_CXXALIAS_RPL (gets, char *, (char *s));
+-# else
+-_GL_CXXALIAS_SYS (gets, char *, (char *s));
+-#  undef gets
+-# endif
+-_GL_CXXALIASWARN (gets);
+ /* It is very rare that the developer ever has full control of stdin,
+-   so any use of gets warrants an unconditional warning.  Assume it is
+-   always declared, since it is required by C89.  */
++   so any use of gets warrants an unconditional warning; besides, C11
++   removed it.  */
++#undef gets
++#if HAVE_RAW_DECL_GETS
+ _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
+ #endif
+ 
+-- 
+1.8.2.3
+