convert docx to pdf creates a document which display all []

I need help.

After spent many days of struggling, finally I built libreoffcie-4.4.0.3 on
Arch linux. I built it without X enabled so I can't use the UI to see is
anything wrong apparently.

I run the command line on new built software: soffice --headless
--convert-to pdf my.docx 
(here my.docx is a regular English document with size 19K) 

my.pdf has been created successfully. but the display in Adobe Reader looks
strange: The structure of pdf resembles original docx format. but all
characters in pdf are display as [], in Adobe Reader. 

I used an online tool which claims to extract text from pdf file. I got back
space plus FFFFFFFFFF...

I did the compare with the result from running the same command against
libreoffice installed on Mac. Here is the summary: 

                                                    Original file size
(.docx)        size of pdf after convert (.pdf) 
using software built on linux box:       19K                                         
8.5K 
using software installed on Mac:         19K                                         
98K 

I did further testing:
1. convert docx to txt or html, there is no issue
2. create a txt document which contains one character, after convert to pdf
file. The display is a single []

I used pacman to install required libraries first. and build libreoffice.

Following is the options in command line:
--without-java
                --disable-cups
                --with-doxygen=no
                --with-build-version="${_LOver} Arch Linux build-${pkgrel}"
--with-vendor="Arch Linux"
                --prefix=/usr
                --exec-prefix=/usr
                --sysconfdir=/etc
                --libdir=/usr/lib
                --mandir=/usr/share/man
                        --enable-split-app-modules
                        --with-parallelism=${MAKEFLAGS/-j/}
                        --with-system-openssl
                        --disable-fetch-external
                        --enable-verbose
                        --enable-debug
                        --disable-release-build
                        --enable-crashdump
                        --disable-coinmp
                        --disable-avahi
                        --disable-dbus
                        --disable-evolution2
                        --disable-gio
                        --disable-gnome-vfs
                        --disable-lockdown
                        --disable-odk
                        --disable-orcus
                        --enable-python=system
                        --disable-scripting-javascript
                        --disable-telepathy
                        --enable-ext-nlpsolver=no
                        --without-fonts
                        --with-system-apr
                        --with-myspell-dicts
                        --with-system-libcmis
                        --with-system-libexttextcat
                        --with-system-orcus
                        --with-system-liblangtag
                        --with-system-jfreereport
                        --without-system-apache-commons
                        --with-system-libatomic-ops
                        --with-system-dicts
                        --with-system-graphite
                        --with-system-glm
                        --with-system-redland
                        --with-system-serf
                        --without-system-npapi-headers
                        --without-system-libgltf
                        --with-system-poppler
                        --without-system-sane
                        --with-system-boost
                        --with-system-icu
                        --with-system-cairo
                        --with-system-libs
                        --with-system-mythes
                        --with-system-headers
                        --with-system-hsqldb
                        --with-alloc=system
                        --with-system-clucene
                        --with-system-jpeg
                        --with-system-lcms2
                        --with-system-nss
                --without-krb5
                --with-gssapi
                --with-system-vigra
                --with-system-odbc
                --disable-gconf
                --disable-liblangtag
                --with-system-liblangtag
                --disable-postgresql-sdbc
                --disable-firebird-sdbc
                --with-system-clucene
                --with-system-libebook
                --with-system-libetonyek
                --with-system-libfreehand
                --with-system-libcdr
                --with-system-harfbuzz
                        --disable-dependency-tracking
                        --disable-gltf
                        --disable-gtk
                        --disable-gstreamer-1-0
                --disable-gstreamer-0-10
                        --enable-hardlink-deliver

Any idea how this happened or how to debug the issue (which module ? Is
vcl/source/gdi/pdfwriter_impl.cxx the correct place to look at it?).
 
<http://nabble.documentfoundation.org/file/n4143177/Screen_Shot_2015-03-12_at_5.png> 



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