Hello,

In order to use a php gallery (spgm) on my wl-500gx, I installed lighttpd with cgi-mod, php5-cgi, php5-mod-gd. PHP things works really fine, but I noticed a weird thing : I was unable to use gd php functions to manipulate jpeg files. I had a look at the libgd et php5 makefiles in the kamikaze repository and found out that they were compiled without support for jpeg files. That's why I decided to include it myself, by changing the following files:

package/libgd/Makefile
-- without-jpeg \
++ with-jpeg=$(STAGING_DIR)/usr \

package/php5/Makefile
-- without-jpeg \
++ with-jpeg-dir="$(STAGING_DIR)/usr"

I then launch the compilation using V=99 make. The target package/libgd-compile fails with the following error message :

...
/home/bdelagoutte/tmp/trunk/openwrt/staging_dir_mipsel/bin/mipsel-linux-uclibc-g
cc -shared  gd.lo gdfx.lo gd_security.lo gd_gd.lo gd_gd2.lo gd_io.lo gd_io_dp.lo
gd_gif_in.lo gd_gif_out.lo gd_io_file.lo gd_io_ss.lo gd_jpeg.lo gd_png.lo gd_ss
.lo gd_topal.lo gd_wbmp.lo gdcache.lo gdfontg.lo gdfontl.lo gdfontmb.lo gdfonts.
lo gdfontt.lo gdft.lo gdhelpers.lo gdkanji.lo gdtables.lo gdxpm.lo wbmp.lo  -Wl,
--rpath -Wl,/usr/lib -Wl,--rpath -Wl,/usr/lib  -L/usr/lib -L/home/bdelagoutte/tm
p/trunk/openwrt/staging_dir_mipsel/usr/lib -L/home/bdelagoutte/tmp/trunk/openwrt
/staging_dir_mipsel/lib /usr/lib/libjpeg.so -lpng12 -lz -lm  -Wl,-rpath -Wl,/usr
/lib -Wl,-soname -Wl,libgd.so.2 -o .libs/libgd.so.2.0.0
/usr/lib/libjpeg.so: could not read symbols: File in wrong format
collect2: ld returned 1 exit status
make[6]: *** [libgd.la] Erreur 1

It seems that the build process is trying to link against my local i386 libjpeg.so library. What's wrong with the changes I made ? Can anyone give me a piece of advice about how to solve this ?

Thank you !

Benjamin

OK, I made some tests today, and found out that the LDFLAGS line in build_mipsel/gd-2.0.33/Makefile was wrong:
LDFLAGS = -L/usr/lib -Wl,-rpath,/usr/lib -L/home/bdelagoutte/tmp/trunk/openwrt/staging_dir_mipsel/usr/lib -L/home/bdelagoutte/tmp/trunk/openwrt/staging_dir_mipsel/lib -L/home/bdelagoutte/tmp/trunk/openwrt/staging_dir_mipsel/usr/lib

Notice that the -L/usr/lib is what lets the linking process being made against my local /usr/lib/libjpeg.so instead against $(STAGING_DIR)/usr/lib/libjpeg.so

I manually edited the LDFLAGS line in build_mipsel/gd-2.0.33/Makefile, removed the -L/usr/lib bad switch. Now it compiles.

I can't figure out why this variable isn't overrided by the LDFLAGS environment variable set in package/libgd/Makefile:

$(PKG_BUILD_DIR)/.configured:
        (cd $(PKG_BUILD_DIR); rm -rf config.{cache,status} ; \
                $(TARGET_CONFIGURE_OPTS) \
                CFLAGS="$(TARGET_CFLAGS)" \
                CPPFLAGS="-I$(STAGING_DIR)/usr/include -I$(STAGING_DIR)/include" \
                LDFLAGS="-L$(STAGING_DIR)/usr/lib -L$(STAGING_DIR)/lib" \
                LIBPNG12_CONFIG="$(STAGING_DIR)/usr/bin/libpng12-config" \
                ./configure \

...

In fact, those LDFLAGS are added to the LDFLAGS in Makefile but don't replace them !

Where is my problem ?

Once it worked, I installed the created packages on my asus wl-500gx. It *theorically* runs fine, i.e. the php5-mod-gd includes support for jpeg files. In fact it's unusable for what I was planning to do : it takes a long long time to create a thumbnail from a small 5 KB jpeg file... It runs out of time for a 100 KB jpeg file...

Seems like it wasn't a good idea !

Why is jpeg processing so slow on a small mips device ? The first thing is that the CPU only runs at 200 MHz. The second thing may be that the libjpeg is using a lot of floating point operation, which are slowly processed by a integer CPU. Am I right ?