Compiling dynamic library with ACLIC using "-rpath"

Cling
1

Hello.

I want to compile dynamic library with ACLIC and link it it with another library compiled by gcc. And then use this library in CLING. How can i do that?

That’s what I have:

“ns_lib.hpp”:

#ifndef _NS_LIB_HPP_
# define _NS_LIB_HPP_

extern char const *gBuf;

extern int main_ns_lib();

#endif

“ns_lib.cpp”:

#ifndef _NS_LIB_CPP_
# define _NS_LIB_CPP_

# include "ns_lib.hpp"

# include <stdio.h>

# include "NS/FuncUtils.hxx"
# include "NS/CommonUtils.hxx"

char const *gBuf = "test buffer";

int main_ns_lib()
{
	NS_abs_buf buf;
	double a[] = {0, 1, 2};

	NS_AbsBufInit(&buf);

	printf("Hello world from main_ns_lib()!\n");
	printf("Check FuncUtils: pol = %f\n", NS_PolF(a, 2, 1));

	NS_AbsBufPushBack< double >(&buf, 2);
	NS_AbsBufFini(&buf);
	return (0);
}
#endif

where NS_abs_buf, NS_AbsBufInit, NS_AbsBufPushBack, NS_AbsBufFini are from my CommonUtils dynamic library, and NS_PolF is from FuncUtils dynamic library.

So, i try to compile the library with this script:

#include <string.h>

#include "root/TSystem.h"


void build_aclic(char const *aLib)
{
	char strb[128];

	gSystem->AddIncludePath("-I${TESTDIR}/src/include"); // includedir of "ns_lib.hpp"
	sprintf(strb, "./src/test/root6/%s", aLib);
	printf("compile 'ns_lib.cpp ...\n");
	gSystem->AddLinkedLibs("-L/usr/local/lib/NSutils -lFuncUtils -lCommonUtils");
	gSystem->CompileMacro(strb, "kfcv-", "ns_lib", "./build/aclic");
	return;
}

The library “ns_lib.so” is created successfully.
Now I want to use this library in another script (“load_lib.cpp”):

#include "root/Rtypes.h"
#include "root/TROOT.h"

R__ADD_INCLUDE_PATH($PROJECTSDIR/test.world/src/include) // includedir of ns_lib.hpp and ns_lib2.hpp
#include "ns_lib.hpp"
#include "ns_lib2.hpp"

R__ADD_LIBRARY_PATH($PROJECTSDIR/test.world/build/aclic) // path of ns_lib.so

R__LOAD_LIBRARY(ns_lib.so)


int main_load_aclic_libs()
{
	printf("libraries: %s\n", gSystem->GetLibraries());
	main_ns_lib();
	return (0);
}

But after loading this script in CLING (in ROOT session) with .L load_lib.cpp I have the next:

cling::DynamicLibraryManager::loadLibrary(): libCommonUtils.so: cannot open shared object file: No such file or directory
Error in <AutoloadLibraryMU>: Failed to load library /home/nazar_s/devel/projects/test.world/build/aclic/ns_lib.socling JIT session error: Failed to materialize symbols: { (main, { _Z11main_ns_libv }) }
[runStaticInitializersOnce]: Failed to materialize symbols: { (main, { _Z20main_load_aclic_libsi, __stmts__0, _GLOBAL__sub_I_cling_module_10, __orc_init_func.cling-module-10, $.cling-module-10.__inits.0 }) }

So, what I’m doing wrong?

Best wishes,
Nazar

2

Ok, I found what I need.
I should manually add -Wl,-rpath=/usr/local/lib/NSutils to fMakeSharedLib using gSystem->SetMakeSharedLib().

So:

  1. I get the fMakeSharedLib with gSystem->GetMakeSharedLib()
  2. Insert -Wl,-rpath=/my/path right before "$LinkedLibs"
  3. Push it back with gSystem->SetMakeSharedLib()
  4. Compiling by gSystem->CompileMacro(strb, "kfcv-", "ns_lib", "./build/aclic");

Now i can use my ns_lib.so in “run-time” without adding library path and loading CommonUtils and FuncUtils.

1 Like
3

Thanks for sharing the solution with the ROOT Community!

D

1 Like