I would add one more thing here too. The plugin.so file comprises of 2 files i.e. plugin.c and smon.c. smon.c contains a call to pow() function. The issue is this that things are working well if am compiling with a normal GCC compiler but when I am using cross compiler it is complaining about the pow() symbol. Regards Abdul On Tue, Sep 4, 2012 at 2:11 PM, Abdul Wahid Memon <engrwahidmemon@xxxxxxxxx> wrote: > Andrew > > This is the problem that cross compiler is not linking with the math library. > > During plugin development, I have specified -lm (though it is also > compiling without specifying -lm) and also when I am calling the > plugin, I am specifying -lm to indicate the compiler that link the > math library too. > > But, in my previous mail, as can be seen that the libraries searched > do not include libmath.so file. This is what I don't understand that > why it is not including the library. > > Regards > > Abdul > > On Tue, Sep 4, 2012 at 1:59 PM, Andrew Haley <aph@xxxxxxxxxx> wrote: >> On 09/04/2012 01:33 PM, Abdul Wahid Memon wrote: >> >>> I did the compilation with LD_DEBUG=symbols and got the following >>> output. I don't understand that why it is not looking for math >>> library. >>> >>> $ LD_DEBUG=symbols arm-none-linux-gnueabi-gcc >>> -fplugin=/home/abdul/plugin_v4.so hello.c -lm >>> -L/home/abdul/cross-tools/rootfs/arm-none-linux-gnueabi/libc/usr/lib/ >>> >>> symbol=pow; lookup in >>> file=/home/abdul/cross-tools/rootfs/bin/../libexec/gcc/arm-none-linux-gnueabi/4.6.2/cc1 >>> [0] >>> 30679: symbol=pow; lookup in >>> file=/home/abdul/cross-tools/rootfs/lib/libmpc.so.2 [0] >>> 30679: symbol=pow; lookup in >>> file=/home/abdul/cross-tools/rootfs/lib/libmpfr.so.1 [0] >>> 30679: symbol=pow; lookup in >>> file=/home/abdul/cross-tools/rootfs/lib/libgmp.so.3 [0] >>> 30679: symbol=pow; lookup in file=/usr/lib/libdl.so.2 [0] >>> 30679: symbol=pow; lookup in file=/usr/lib/libc.so.6 [0] >>> 30679: symbol=pow; lookup in file=/lib64/ld-linux-x86-64.so.2 [0] >>> 30679: symbol=pow; lookup in file=/home/abdul/plugin_v4.so [0] >>> 30679: symbol=pow; lookup in file=/usr/lib/libc.so.6 [0] >>> 30679: symbol=pow; lookup in file=/lib64/ld-linux-x86-64.so.2 [0] >>> 30679: /home/abdul/plugin_v4.so: error: symbol lookup error: >>> undefined symbol: pow (fatal) >>> >>> And for the plugin I got >>> >>> linux-vdso.so.1 (0x00007fffb3ba2000) >>> libc.so.6 => /usr/lib/libc.so.6 (0x00007f8e03274000) >>> /usr/lib/ld-linux-x86-64.so.2 (0x00007f8e03843000) >>> >>> Any further suggestions. >> >> I don't really understand what difficult you are having. Clearly >> something need to be linked with -lm. It's whatever object uses >> pow(). I don't know which object that is, because you haven't told >> me. It may be your plugin, in which case your plugin needs to be >> linked with -lm. This is just normal C programming, nothing to do >> with GCC. >> >> Andrew.
