[x265] trying to compile a JNI shared lib on linux - libx265.a(cpu-a.asm.o): relocation R_X86_64_PC32

[Zoff]

Hi!

here is a short reproducer:


-------------- jni.c --------------
#include <jni.h>
#include <x265.h>
JNIEXPORT jint JNICALL Java_factorial_fact(JNIEnv *env, jobject obj)
{
     x265_param *param = x265_param_alloc();
     x265_param_free(param);
     return 0;
}
-------------- jni.c --------------


# then compile like this

mkdir -p /tmp/install/
_INST_=/tmp/install/
git clone https://bitbucket.org/multicoreware/x265_git.git
cd x265_git/
git checkout 1d117bed4747758b51bd2c124d738527e30392cb
cmake source/. -DCMAKE_INSTALL_PREFIX="$_INST_" -DENABLE_PIC=ON -DENABLE_ASSEMBLY=ON
make
make install

gcc -O2 -g -fPIC -Wall -I/usr/lib/jvm/java-17-openjdk-amd64/include/ \
  -I/usr/lib/jvm/java-17-openjdk-amd64/include/linux/ -I"$_INST_"/include ./jni.c $_INST_/lib/libx265.a -shared -Wl,-soname,libjni.so -o libjni.so

/usr/bin/ld: /tmp/install//lib/libx265.a(cpu-a.asm.o): warning: relocation against `x265_intel_cpu_indicator_init' in read-only section `.text'
/usr/bin/ld: /tmp/install//lib/libx265.a(cpu-a.asm.o): relocation R_X86_64_PC32 against symbol `x265_intel_cpu_indicator_init' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: bad value


	cheers,
	Zoff.

On 30.11.24 20:03, Zoff wrote:
> Hi!
> 
> i am trying to compile x265 encoder library for linux (amd64) as a static lib and then
> making a shared JNI lib for java with it.
> if i do this:
> 
> git clone https://bitbucket.org/multicoreware/x265_git.git
> cd x265_git/
> git checkout 1d117bed4747758b51bd2c124d738527e30392cb
> cmake . -DCMAKE_INSTALL_PREFIX="$_INST_" -DNATIVE_BUILD=ON -DENABLE_PIC=ON
> 
> everything works fine, but the i don't get asm optimizations.
> 
> if i do this:
> 
> cmake . -DCMAKE_INSTALL_PREFIX="$_INST_" -DNATIVE_BUILD=ON -DENABLE_PIC=ON -DENABLE_ASSEMBLY=ON
> 
> and the link my final JNI lib i get this error:
> 
> libx265.a(cpu-a.asm.o): relocation R_X86_64_PC32 against symbol `x265_intel_cpu_indicator_init' can not be used when making a shared object; recompile with -fPIC
> 
> to the best of my knowledge everything is compiled with FPIC. any ideas why this is not working?
> 
>      cheers,
>      Zoff.
> 
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>