[Buildroot] SDL2_ttf requires libpng12 but Buildroot installs libpng16

[Buildroot] SDL2_ttf requires libpng12 but Buildroot installs libpng16

[Peter Thompson]

I am trying to install the SDL2 suite  (SDL2, SDL2_gfx, SDL2_image,
SDL2_ttf) using Buildroot-2016-02.  SDL2 is incorporated into
Buildroot-2016-02.   SDL2_gfx and SDL2_image are relatively straight
forward to add,  but SDL2_ttf is being problematic.    SDL2_ttf can't/won't
use libpng16.

I manually compiled libpng-1.2.56 and freetype-2.6.3 and used those (and
buildroot staging) to compile SDL2_ttf.

It compiled ok, as did my application  but now I get runtime error messages
when running my test application on my igepv2 board.


libpng warning: Application built with libpng-1.2.56 but running with 1.6.21
SDL message::  unable to load viewsensor.png:: Couldn't allocate memory for
PNG file or incompatible PNG dll


My questions are:

1. Can I change Buildroot-2016-02 to use libpng12 instead of libpng16?   I
looked at libpng dependencies in Buildroot and they are HUGE!   I see no
easy way to change to libpng12.

2. Does an earlier version of buildroot use libpng12?  Should I use that?
I would miss having SDL2 available in buildroot - I had problems compiling
that earlier.

3. Should I use buildroot to build a barebones rootfs without libpng and
create what I need from there.  Looking briefly at the dependencies, I am
not sure that is possible.


I checked Ubuntu on which my application works fine.  It runs with libpng12
only.


===========================================================================
Below are my personal notes which I used to create SDL2_ttf...
    [Free Electons] refers to course notes from Free Electrons that I still
use.
===============================================================================


Step 1 Download SDL2_ttf & png-1.2.56.tar.gz
-----------------------------------------------

SDL2_ttf-2.0.12.tar.gz
libpng-1.2.56.tar.gz    ##NOTE libpng12 needed by SDL2_ttf.
                        ## Buildroot provides libpng16
cd 94SDLttf
tar -xvzf SDL2_ttf-2.0.12.tar.gz
tar -xvzf libpng-1.2.56.tar.gz

echo $PATH
export PATH=$PATH:/usr/local/xtools/arm-unknown-linux-gnueabi/bin/
        # Buildroot requires glibc (Error IPV6 required)
            - will not work against uclibc

arm-linux-gcc -print-search-dirs ==>



Step 2 - compile libpng  (see Free Electrons)
------------------------------------------------
cd libpng-1.2.56/
export PATH=$PATH:/usr/local/xtools/arm-unknown-linux-gnueabi/bin/
export CC=arm-linux-gcc
export
CPPFLAGS=-I/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/staging/usr/include
export  LDFLAGS=-L/home/peter/igep2015/94SDLttf/pmtstaging/usr/lib/
export CFLAGS=-Wl,--verbose
./configure --host=arm-linux --prefix=/usr
make
make DESTDIR=/home/peter/igep2015/pmtstaging/  install


sudo cp -a ~/igep2015/pmtstaging/usr/lib/libpng12.so*
/home/peter/igep2015/pmtroot/usr/lib/
arm-linux-strip /home/peter/igep2015/pmtroot/usr/lib/libpng12.so.0.56.0

NOTE::: Don't forget to add the fonts to pmtroot (copy from Ubuntu)
cp /usr/share/fonts/truetype/freefont/*.*
~/igep2015/pmtroot/usr/share/fonts/truetype/freefont/


Step 2 - compile freetype-2.6.3  (see Free Electrons)
------------------------------------------------------

cd freetype-2.6.3
export PATH=$PATH:/usr/local/xtools/arm-unknown-linux-gnueabi/bin/
export CC=arm-linux-gcc
export
CPPFLAGS=-I/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/staging/usr/include
export  LDFLAGS=-L/home/peter/igep2015/94SDLttf/pmtstaging/usr/lib/
./configure --host=arm-linux  --prefix=/usr
make
make DESTDIR=/home/peter/igep2015/94SDLttf/pmtstaging/  install
make DESTDIR=/home/peter/igep2015/pmtstaging/  install

sudo cp -a ~/igep2015/pmtstaging/usr/lib/libfreetype.so*
/home/peter/igep2015/pmtroot/usr/lib/
arm-linux-strip /home/peter/igep2015/pmtroot/usr/lib/libfreetype.so.6.12.3



*******************************************************************
****************** Finally what I want - SDL2_ttf ******************
*********************************************************************

Step 3 - compile SDL2_ttf (see Free Electrons DirectFB for ideas)
-------------------------------------------------------------

cd ~/igep2015/94SDLttf/SDL2_ttf-2.0.14/

######################################################################
##### change 2 linker scripts in Buildroot #### see stackoverflow by peter
####
Change
/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/host/usr/armeb-buildroot-linux-gnueabi/sysroot/usr/lib/libc.so
FROM:
/* GNU ld script
    Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( /lib/libc.so.6 /usr/lib/libc_nonshared.a  AS_NEEDED (
/lib/ld-linux.so.3 ) )
TO:
/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( ../../lib/libc.so.6 libc_nonshared.a  AS_NEEDED (
../../lib/ld-linux.so.3 ) )

Change
/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/host/usr/armeb-buildroot-linux-gnueabi/sysroot/usr/lib/libpthread.so
FROM:
/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( /lib/libpthread.so.0 /usr/lib/libpthread_nonshared.a )
TO:
/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( ../../lib/libpthread.so.0 libpthread_nonshared.a )

################################################################
   ### create pmtstaging - if not done before ###
cp -a
/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/host/usr/armeb-buildroot-linux-gnueabi/sysroot
/home/peter/igep2015/
mv /home/peter/igep2015/sysroot   /home/peter/igep2015/pmtstaging

#################################################################


export PATH=$PATH:/usr/local/xtools/arm-unknown-linux-gnueabi/bin/
export CC=arm-linux-gcc
export CFLAGS="-v -Wl,--verbose"           ###optional for debugging
export CPPFLAGS="-I/home/peter/igep2015/94SDLttf/pmtstaging/usr/include
-I/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/host/usr/armeb-buildroot-linux-gnueabi/sysroot/usr/include
-I/home/peter/igep2015/94SDLttf/pmtstaging/usr/include/freetype2"

export
LDFLAGS="-L/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/host/usr/armeb-buildroot-linux-gnueabi/sysroot/lib
-L/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY5/output/host/usr/armeb-buildroot-linux-gnueabi/sysroot/usr/lib
-L/home/peter/igep2015/94SDLttf/pmtstaging/usr/lib"




./configure --host=arm-linux --prefix=/usr
--with-freetype-prefix=/home/peter/igep2015/94SDLttf/pmtstaging/usr


make
make DESTDIR=/home/peter/igep2015/pmtstaging/  install
YIPPEEEE   YIPPPEEEEE ---- IT WORKS!!!  AFTER 3+ WEEKS OF WORK *****




Step 6  - transfer libs to igpev2
--------------------------------
sudo cp -a ~/igep2015/pmtstaging/usr/lib/libSDL2_ttf-2.0.so*
/home/peter/igep2015/pmtroot/usr/lib/
sudo cp -a ~/igep2015/pmtstaging/usr/lib/libSDL2_ttf.so
/home/peter/igep2015/pmtroot/usr/lib/
arm-linux-strip
/home/peter/igep2015/pmtroot/usr/lib/libSDL2_ttf-2.0.so.0.14.0



=================================================================================
Compile the application
=================================================================================
export PKG_CONFIG_PATH=/home/peter/igep2015/pmtstaging/usr/lib/pkgconfig/


arm-linux-gcc viewtestARM.c SDL2init.c -o viewtestARM -Wl,--verbose
--sysroot=/home/peter/igep2015/pmtstaging/ $(pkg-config --libs --cflags
sdl2)  $(pkg-config --libs --cflags SDL2_gfx)  $(pkg-config --libs --cflags
SDL2_image)  $(pkg-config --libs --cflags SDL2_ttf)

==============================================================================
Buildroot configuration used
=========================================================================
Target Options
        Target Architecture:      ARM (little endian)
        Target ARchitecture Variant: arm926t
        Target ABI:            EABI
        Floating point strategy    Soft float
        ARM instruction set        ARM
Build options --ignore
    please enable BR2_TOOLCHAIN_HAS_SSP [peter ? why needed - not sure??]
        after toolchain built below
Toolchain
    Toolchain type:     External toolchain
    Toolchain:        Custom toolchain
    Toolchain origin:    Pre-installed toolchain
    Toolchain path:        /usr/local/xtools/arm-unknown-linux-gnueabi
    Toolchain prefix:    arm-linux       OR    #normally is $(ARCH)-linux
==> arm-linux
    External toolchain gcc version: (see arm-linux-gcc --version OR
        OR arm-linux-gcc -xc -v  ==> 5.1.x
    External toolchain kernel headers series: (.../sysroot/usr/include/ )
==> 4.0.x
    External toolchain C library: uClibc OR glibc --> see 00README for
which machine
        NOTE with glibc several options below are already included eg
WCHAR, locale
    enable[Free Electrons]    large file support, RPC support, C++ support
    enable[peter]        WCHAR,locale,

    enable copy gdb server to Target, enable MMU support,
    Target linker options:    NONE

System Configuration
    System hostname:    PMTigepv2
    System banner        PMTigepv2 - Jan 23, 2016 {ie build date}
    enable Dynamic using devtmpfs + mdev
            ( instead of Dynamic using devtmpfs only) for fxos8700
    enable install timezone info
    leave everything else buildroot default ( be sure busybox is init
program)
Kernel --ignore
Target Packages
    Filesystem and flash utilities
        mtd,jffs2 and ukbi/ubifs tools  ## needed for mtdinfo: use defaults
        squashfs                        ## not really needed?? add anyway
    Graphics libraries and applications (graphic/text)
        DirectFB (remove DirectFB touchscreen)   #NO - use defaults
        DirectFB (all examples -- df_andi for sure)
        fbterm        #next 6 fb items are NEW
        fbv
        fbdump
        fbgrab
        fb-test-app
        SDL2
        SDL2 directFB video driver   # Don't forget this SILLY!!!

    Hardware Handling:
        evtest  NEW-ADD-ON-NEXT-COMPILE-PLEASE PETER
        i2c-tools  ::NOTE: lm-sensors.org disappeared.
              may have to build from scratch using
              https://web.archive.org/web/20150905145034/
            http://www.lm-sensors.org/
        lshw
        picocom
        minicom

    Libraries - Graphics (NEW)
        tiff (NEW)
        tiff utilities (NEW)
    Text Editors
        nano



Filesystem images
    ext 2/3/4 root filesystem:    ext3
    compression method = no compression
    enable tar the root filesystem + gzip compression
        OR leave tar the root filesystem at no compression
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[Buildroot] SDL2_ttf requires libpng12 but Buildroot installs libpng16

[Gustavo Zacarias]

On 02/05/16 12:57, Peter Thompson wrote:

> I am trying to install the SDL2 suite  (SDL2, SDL2_gfx, SDL2_image,
> SDL2_ttf) using Buildroot-2016-02.  SDL2 is incorporated into
> Buildroot-2016-02.   SDL2_gfx and SDL2_image are relatively straight
> forward to add,  but SDL2_ttf is being problematic.    SDL2_ttf
> can't/won't use libpng16.

Hi.
SDL2_ttf doesn't use libpng at all, combined with the fact that you're 
building the additional SDL2* packages manually is a recipe for trouble.

> My questions are:
>
> 1. Can I change Buildroot-2016-02 to use libpng12 instead of libpng16?
> I looked at libpng dependencies in Buildroot and they are HUGE!   I see
> no easy way to change to libpng12.

Maybe, but expect other packages breaking because they require newer API 
functionality or decided they didn't want to deal with old libpng.

> 2. Does an earlier version of buildroot use libpng12?  Should I use
> that?  I would miss having SDL2 available in buildroot - I had problems
> compiling that earlier.

Not really, i think you're wrong in trying to manually build everything.

> 3. Should I use buildroot to build a barebones rootfs without libpng and
> create what I need from there.  Looking briefly at the dependencies, I
> am not sure that is possible.

No, again, make the additional SDL2* packages (sic) proper packages, 
that's the way, i'm pretty sure it will just work(tm) at least for 
SDL2_ttf since there's no mention of anything png-related in the source.
Regards.

[Buildroot] SDL2_ttf requires libpng12 but Buildroot installs libpng16

[Peter Thompson]

Hi Thomas,
You are correct of course.     I am guilty of clicking the box and using
the results of Buildroot - without ever really looking under the hood....
and I got away with it in SDL1-2....:)

Peter

On Fri, May 13, 2016 at 2:44 PM, Thomas Petazzoni <
thomas.petazzoni@free-electrons.com> wrote:

> Hello,
>
> On Fri, 13 May 2016 14:39:23 -0600, Peter Thompson wrote:
>
> > The  answer is that I was unaware of the Buildroot autotools capability.
>
> Well, this is a bit hard to believe. Your work relies on the fact that
> Buildroot builds SDL2, right?
>
> And what is SDL2 using? The autotools. So surely, if you had taken a
> look at package/sdl2/sdl2.mk, which is the Buildroot description of how
> to build SDL2, you would have seen in a few minutes how an
> autotools-based package is handled.
>
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
>
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[Buildroot] SDL2_ttf requires libpng12 but Buildroot installs libpng16

[Thomas Petazzoni]

Hello,

On Fri, 13 May 2016 14:39:23 -0600, Peter Thompson wrote:

> The  answer is that I was unaware of the Buildroot autotools capability.

Well, this is a bit hard to believe. Your work relies on the fact that
Buildroot builds SDL2, right?

And what is SDL2 using? The autotools. So surely, if you had taken a
look at package/sdl2/sdl2.mk, which is the Buildroot description of how
to build SDL2, you would have seen in a few minutes how an
autotools-based package is handled.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[Buildroot] SDL2_ttf requires libpng12 but Buildroot installs libpng16

[Peter Thompson]

Hi Thomas,
The  answer is that I was unaware of the Buildroot autotools capability.
Without really searching, I assumed if something was not already in
Buildroot, I had to add it manually.    I have re-examined the Buildroot
users manual
     https://*buildroot*.org/manual.html
and the Free Electrons notes
     http://free-electrons.com/~thomas/buildroot/manual/html/ch11.html
and it seems like a much better way to do it and is something within my
capability.

Having said that,  I learned a lot doing things manually even though it was
extremely frustrating and took me a very long time.    I almost gave up a
couple of times.    The help I got from you guys was super - and really
encouraging.

Thanks
Peter


On Thu, May 12, 2016 at 3:45 PM, Thomas Petazzoni <
thomas.petazzoni@free-electrons.com> wrote:

> Hello,
>
> On Thu, 12 May 2016 13:05:56 -0600, Peter Thompson wrote:
>
> > Below are my personal notes on how I compiled the SDL2 suite  -   in the
> > hopes it is helpful to someone else.   pmtstaging is a copy of the
> > buildroot sysroot which I wanted to keep pristine during this process.
> >
> > I will try to convert these  notes into a buildroot patch and submit it -
> > making life much easier in the future.
>
> Quick question that might sound silly, but I believe worth asking: why
> are you taking this terribly complicated path to build SDL2_ttf
> manually, rather than creating a Buildroot package directly?
>
> The Buildroot autotools package infrastructure already handles most of
> the cross-compilation problems by itself. So all this terrible dance of
> CFLAGS and LDFLAGS, copying of sysroot and stuff that you're doing
> would have been completely unneeded if you had done a Buildroot package
> from the beginning.
>
> It seems to me like you've wasted a huge amount of time :-/
>
> Best regards,
>
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
>
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[Buildroot] SDL2_ttf requires libpng12 but Buildroot installs libpng16

[Thomas Petazzoni]

Hello,

On Thu, 12 May 2016 13:05:56 -0600, Peter Thompson wrote:

> Below are my personal notes on how I compiled the SDL2 suite  -   in the
> hopes it is helpful to someone else.   pmtstaging is a copy of the
> buildroot sysroot which I wanted to keep pristine during this process.
> 
> I will try to convert these  notes into a buildroot patch and submit it -
> making life much easier in the future.

Quick question that might sound silly, but I believe worth asking: why
are you taking this terribly complicated path to build SDL2_ttf
manually, rather than creating a Buildroot package directly?

The Buildroot autotools package infrastructure already handles most of
the cross-compilation problems by itself. So all this terrible dance of
CFLAGS and LDFLAGS, copying of sysroot and stuff that you're doing
would have been completely unneeded if you had done a Buildroot package
from the beginning.

It seems to me like you've wasted a huge amount of time :-/

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[Buildroot] SDL2_ttf requires libpng12 but Buildroot installs libpng16

[Peter Thompson]

Thanks Gustavo,   You are absolutely correct - and you saved me a huge
amount of mis-spent effort doing "wrong" things.

Below are my personal notes on how I compiled the SDL2 suite  -   in the
hopes it is helpful to someone else.   pmtstaging is a copy of the
buildroot sysroot which I wanted to keep pristine during this process.

I will try to convert these  notes into a buildroot patch and submit it -
making life much easier in the future.

Again - thanks for the help.

PS - I hope I am submitting this update properly....

===================================================
original message

On 02/05/16 12:57, Peter Thompson wrote:

>* I am trying to install the SDL2 suite  (SDL2, SDL2_gfx, SDL2_image,
*>* SDL2_ttf) using Buildroot-2016-02.  SDL2 is incorporated into
*>* Buildroot-2016-02.   SDL2_gfx and SDL2_image are relatively straight
*>* forward to add,  but SDL2_ttf is being problematic.    SDL2_ttf
*>* can't/won't use libpng16.
*
Hi.
SDL2_ttf doesn't use libpng at all, combined with the fact that you're
building the additional SDL2* packages manually is a recipe for trouble.

>* My questions are:
*>>* 1. Can I change Buildroot-2016-02 to use libpng12 instead of libpng16?
*>* I looked at libpng dependencies in Buildroot and they are HUGE!   I see
*>* no easy way to change to libpng12.
*
Maybe, but expect other packages breaking because they require newer API
functionality or decided they didn't want to deal with old libpng.

>* 2. Does an earlier version of buildroot use libpng12?  Should I use
*>* that?  I would miss having SDL2 available in buildroot - I had problems
*>* compiling that earlier.
*
Not really, i think you're wrong in trying to manually build everything.

>* 3. Should I use buildroot to build a barebones rootfs without libpng and
*>* create what I need from there.  Looking briefly at the dependencies, I
*>* am not sure that is possible.
*
No, again, make the additional SDL2* packages (sic) proper packages,
that's the way, i'm pretty sure it will just work(tm) at least for
SDL2_ttf since there's no mention of anything png-related in the source.
Regards.

======================================================
Peter Thompson personal notes on building SDL2 suite.

Step 5 - Create pmtstaging
---------------------------
cp -a
/home/peter/igep2015/09Buildroot/buildroot-2016.02-TRY6/output/host/usr/armeb-buildroot-linux-gnueabi/sysroot
/home/peter/igep2015/
mv /home/peter/igep2015/sysroot   /home/peter/igep2015/pmtstaging



BUILD FROM SCRATCH BECAUSE BUILDROOT USES SDL1.2
#########   also see readme-raspberrypi.txt in SDL sources ##############

Step -1 Download SDL2 suite
--------------------------
SDL2_gfx-1.0.1.tar.gz
SDL2_image-2.0.0.tar.gz
SDL2_ttf-2.0.14.tar.gz
tar -xvzf  SDL2_gfx-1.0.1.tar.gz
tar -xvzf  SDL2_image-2.0.0.tar.gz
tar -xvzf  SDL2_ttf-2.0.14.tar.gz


Step 0 - Set Ubuntu environment variables
-----------------------------------------
echo $PATH
export PATH=$PATH:/usr/local/xtools/arm-unknown-linux-gnueabi/bin/
        # Buildroot requires glibc (Error IPV6 required)
            - will not work against uclibc

export PATH=$PATH:/usr/local/xtools/arm-unknown-linux-gnueabi/bin/
export CC=arm-linux-gcc
export CFLAGS="-v -Wl,--verbose"           ###optional for debugging

======================================================================
#########################    SDL2_gfx    ############################


Step 1 - Configure SDLgfx
--------------------------
cd ~/igep2015/92SDLgfx/SDL2_gfx-1.0.1
read README file

./configure --help         # look in config.log to debug SDL configuration

make clean                #
make distclean            # if redoing configuration

--environment variables
export LDFLAGS="-L/home/peter/igep2015/pmtstaging/lib
-L/home/peter/igep2015/pmtstaging/usr/lib"
export CPPFLAGS=-I/home/peter/igep2015/pmtstaging/usr/include
export CC="arm-linux-gcc --sysroot=/home/peter/igep2015/pmtstaging"

./configure  --prefix=/usr --host=arm-linux --disable-mmx
--with-sysroot=/home/peter/igep2015/pmtstaging


Step 2 make & install in pmtstaging
-----------------------------------
make
make DESTDIR=/home/peter/igep2015/pmtstaging/  install

 ## to see what's being installed also do ###
make DESTDIR=/home/peter/igep2015/93SDLgfx/staging  install



Step 3 - transfer libs to igpev2 sysroot (pmtroot)
---------------------------------------------------
....copy the library libSDL2_gfx to pmtroot
sudo cp -a ~/igep2015/pmtstaging/usr/lib/libSDL2_gfx-1.0.*
/home/peter/igep2015/pmtroot/usr/lib/
sudo cp -a ~/igep2015/pmtstaging/usr/lib/libSDL2_gfx.so
/home/peter/igep2015/pmtroot/usr/lib/

# if not still debugging, strip symbols
arm-linux-strip
/home/peter/igep2015/pmtroot/usr/lib/libSDL2_gfx-1.0.so.0.0.1


==============================================================================
########################    SDL2_image
####################################


Step 1 - Configure
------------------
cd ~/igep2015/93SDLimage/SDL2_image-2.0.0
read README.txt file

./configure --help         # look in config.log to debug SDL configuration

make clean
make distclean            # if redoing configuration



 -- environment variables (same as above)
export LDFLAGS="-L/home/peter/igep2015/pmtstaging/lib
-L/home/peter/igep2015/pmtstaging/usr/lib"
export CPPFLAGS=-I/home/peter/igep2015/pmtstaging/usr/include
export CC="arm-linux-gcc --sysroot=/home/peter/igep2015/pmtstaging"


./configure  --prefix=/usr --host=arm-linux --disable-gif --disable-jpg
--disable-jpg-shared --disable-lbm --disable-pcx --disable-pnm
--disable-tga --disable-xcf --disable-xpm --disable-xv --disable-webp
--disable-webp-shared
   (**NOTE --with-sysroot= not supported)


Step 2 make & install in pmtstaging
-----------------------------------
make
make DESTDIR=/home/peter/igep2015/pmtstaging/  install

 ## to see what's being installed also do ###
make DESTDIR=/home/peter/igep2015/94SDLimage/staging  install


Step 3 - transfer libs to igpev2 sysroot (pmtroot)
--------------------------------------------------
....copy the library libSDL2_image to pmtroot
sudo cp -a ~/igep2015/pmtstaging/usr/lib/libSDL2_image-2.0.*
/home/peter/igep2015/pmtroot/usr/lib/
sudo cp -a ~/igep2015/pmtstaging/usr/lib/libSDL2_image.so
/home/peter/igep2015/pmtroot/usr/lib/

# if not still debugging, strip symbols
arm-linux-strip
/home/peter/igep2015/pmtroot/usr/lib/libSDL2_image-2.0.so.0.0.0


Step 4 Cross-Compile into pmtroot & test
----------------------------------------
cd ~/igep2015/pmtroot/root/helloworld/hellosensor
export PATH=$PATH:/usr/local/xtools/arm-unknown-linux-gnueabi/bin/
export PKG_CONFIG_PATH=/home/peter/igep2015/pmtstaging/usr/lib/pkgconfig/
rm test3
arm-linux-gcc -o test3 ~/Documents/helloworld/hellosensor/test3.c
--sysroot=/home/peter/igep2015/pmtstaging/ $(pkg-config --libs --cflags
sdl2) $(pkg-config --libs --cflags SDL2_image)
./test3
IT WORKS!!!

==============================================================================
########################    SDL2_ttf    ####################################

Information
------------
arm-linux-gcc -print-search-dirs ==>
arm-linux-gcc -print-sysroot
-Wl,--verbose   pass this flag to linker as in
        arm-linux-gcc -Wl,--verbose hello.c
see www.stackoverflow.com >> user >> Peter Thompson (3 questions)
http://stackoverflow.com/questions/36682302/cant-access-buildroot-staging-libraries-via-configure-when-cross-compiling-i
http://stackoverflow.com/questions/36682427/cannot-cross-compile-sdl2-ttf-onto-arm-linux
http://stackoverflow.com/questions/33343266/cross-compile-sdl2-with-directfb-and-add-to-a-buildroot-root-filesystem


Step 1 - Configure
------------------
cd ~/igep2015/94SDLttf/SDL2_ttf-2.0.14/

 -- environment variables (same as above)
export CPPFLAGS="-I/home/peter/igep2015/pmtstaging/usr/include"
export LDFLAGS="-L/home/peter/igep2015/pmtstaging/lib
-L/home/peter/igep2015/pmtstaging/usr/lib"
export CC="arm-linux-gcc --sysroot=/home/peter/igep2015/pmtstaging"

./configure --host=arm-linux --prefix=/usr
--with-freetype-prefix=/home/peter/igep2015/pmtstaging/usr



Step 2 - make & install in pmtstaging
----------------------------------------
make
make DESTDIR=/home/peter/igep2015/pmtstaging/  install

 ## to see what's being installed also do ###
make DESTDIR=/home/peter/igep2015/95SDLttf/staging  install


Step 3 - transfer libs to igpev2 sysroot (pmtroot)
---------------------------------------------------
sudo cp -a ~/igep2015/pmtstaging/usr/lib/libSDL2_ttf-2.0.so*
/home/peter/igep2015/pmtroot/usr/lib/
sudo cp -a ~/igep2015/pmtstaging/usr/lib/libSDL2_ttf.so
/home/peter/igep2015/pmtroot/usr/lib/

# if not still debugging, strip symbols
arm-linux-strip
/home/peter/igep2015/pmtroot/usr/lib/libSDL2_ttf-2.0.so.0.14.0


Step 4 Cross-Compile into pmtroot & test
----------------------------------------
cd ~/igep2015/pmtroot/root/viewsensor/
export PATH=$PATH:/usr/local/xtools/arm-unknown-linux-gnueabi/bin/
export PKG_CONFIG_PATH=/home/peter/igep2015/pmtstaging/usr/lib/pkgconfig/
rm viewtest
arm-linux-gcc -o viewtest ~/Documents/oz2/sdl2test/viewsensor/viewtest.c
SDL2init.c  --sysroot=/home/peter/igep2015/pmtstaging/ $(pkg-config --libs
--cflags sdl2) $(pkg-config --libs --cflags SDL2_image)  $(pkg-config
--libs --cflags SDL2_ttf)
./viewtest
IT WORKS (be sure to copy fonts into pmtroot)
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