[syslog-ng] cannot find -lglib-2.0 while cross compiling

[Sergei Zhirikov]

On 2010-07-08 11:22, Pal Tamas wrote:
> Hi,
>
> On Thu, Jul 08, 2010 at 10:33:24AM +0300, Hasan Ümit Ezerçe wrote:
>> Hi,
>>
>> I need to run syslog-ng on an itanium RHEL 4.7 server but cannot find
>> any RPM's for ia64 arch. So decided to cross compile it. I am trying
>> to build it on a centos 4.7 VM and get the following error:
>>
>> ia64-unknown-linux-gnu-gcc  -Os -Wall   -o syslog-ng  main.o
>> libsyslog-ng.a -lnsl -lrt  -Wl,-Bstatic  -lglib-2.0   -levtlog   -lnet
>>   -Wl,-Bdynamic  -ldl
>> /opt/crosstool/gcc-3.4.5-glibc-2.3.6/ia64-unknown-linux-gnu/lib/gcc/ia64-unknown-linux-gnu/3.4.5/../../../../ia64-unknown-linux-gnu/bin/ld:
>> cannot find -lglib-2.0
>> collect2: ld returned 1 exit status
>>
>> However it seems that I already have glib-2.0 libs installed:
>> $ pkg-config glib-2.0 --cflags --libs
>> -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -lglib-2.0
>>
>> Can you tell what am I missing here?
>>
>> Best regards.
> By default, pkg-config looks for the native libs on your system, not the
> cross-compiled ones the cross compiler needs. Sadly, I don't have any
> experience with cross-compiling but it'll go something like this:
>
>
> For syslog-ng you need to cross-compile the following libs if you don't
> need crypto support:
>   - libintl
>   - gettext
>   - glib
>   - eventlog
>   - libnet
>
> You have to cross compile and install them to an arbitrary directory.
>
> In all cases, you have to tell ./configure and pkg-config to look for
> needed files under the cross-compile directory. Ex.
> Say, the holding directory for the cross compiled libs is
> /usr/local/cross/ia64.
>
> You have to set the following environment variables before running
> ./configure --prefix=/usr/local/cross/ia64/&&  make:
> PATH=/usr/local/cross/ia64/bin:$PATH
> CFLAGS="-I/usr/local/cross/ia64/include $CFLAGS"
> LDFLAGS="-L/usr/local/cross/ia64/lib $LDFLAGS"
> PKG_CONFIG_PATH=/usr/local/cross/ia64/lib/pkgconfig
>

If you are using sysrooted toolchain then the correct way of using pkg-config is:

PKG_CONFIG_SYSROOT_DIR=$SYSROOT
PKG_CONFIG_LIBDIR=$SYSROOT/usr/lib/pkgconfig

And no PKG_CONFIG_PATH or CFLAGS or LDFLAGS.

For this to work you need a recent version of pkg-config (version 0.25 works weel, but 0.23 does not).