Question about shared library for Solaris
komiyama
komiyama@sddc.sps.mot.com
Tue Apr 20 06:38:00 GMT 2004
Hi GCC experts,
I have a question about Shared library that compiled with Gcc for Solaris.
With above example code,
---------- test1.h -----------------------------------------------
class class1 {
public:
~class1 ();
void func1 ();
};
---------- test1.cc ----------------------------------------------
#include <stdexcept>
#include "test1.h"
using namespace std;
void class1::func1 () {
throw runtime_error ("This is erro ");
}
class1::~class1 () {
cout << "Class1 destructor is called " << endl;
}
--------- main.cc -------------------------------------------------
#include "test1.h"
#include <stdexcept>
using namespace std;
class except_1 {};
class class2 {
public:
~class2 () {
cout << "Class2 destructor is called "<< endl;
}
void func1() { throw except_1 (); }
void func2 () { throw runtime_error ("Error from class2"); }
};
int main () {
class2 test2;
try {
test2.func1();
}
catch ( except_1& e ) {
cout << "Catch except1 " << endl;
}
try {
test2.func2();
}
catch ( runtime_error& e ) {
cout << "Catch except2 " << e.what() << endl;
}
try { // This try block ignored (1)
class1 test;
test.func1();
}
catch ( runtime_error& e ) {
cout << "Catch except2 "<< e.what () << endl;
}
}
-------------------------------------------------------------------
When I create executable with Makefile1, the generated executable
is crashed with,
Catch except1
Catch except2 Error from class2
Abort <----
It seems that try catch block (1) seems to ignored.
---------- Makefile1 ----------------------------------------------
SHARE_OBJ = test1.o
.cc.o :
g++ -g -fPIC -c -o $@ -save-temps $<
libshared.so: ${SHARE_OBJ}
/usr/ccs/bin/ld -G -o $@ ${SHARE_OBJ}
test: main.o libshared.so
g++ -v -o $@ $< -L. -L/usr/local/gcc/2.95.3/lib -lshared -lstdc++
clean:
-/bin/rm *.o *.so
-----------------------------------------------------------------------
But when I compiled with Makefile2, generated executable run without
any problems.
The only difference is when created shared library, in the failed case,
it directory called /usr/ccs/bin/ld ,but passed case it called /usr/ccs/bin/ld
through g++ compiler driver.
( It seems that g++ called collect2 and collect2 called /usr/ccs/bin/ld)
So my questions are,
1: What does collect2 do when it passed data to /usr/ccs/bin/ld ?
2: Is it possible to work with only /usr/ccs/bin/ld ?
( Does not use g++ compiler driver when create shared object )
Environemnt is
O.S : Solaris8 (Sparc)
Gcc : 2.95.3
-------------------- Makefile2 ----------------------------------------
SHARE_OBJ = test1.o
.cc.o :
g++ -g -fPIC -c -o $@ -save-temps $<
libshared.so: ${SHARE_OBJ}
g++ -v -G -o $@ ${SHARE_OBJ} -lc
test: main.o libshared.so
g++ -v -o $@ $< -L. -L/usr/local/gcc/2.95.3/lib -lshared -lstdc++
clean:
-/bin/rm *.o *.so
----------------------------------------------------------------------
Takeo Komiyama
-----------------------------------------------------------------------
Takeo Komiyama
Voice : +81-22-377-9767 Fax : +81-22-377-9709
ESLD design , CSG
Semiconductor Products Division , Nippon Motorola Ltd.
2-9-1 , Akedori, Izumiku, Sendai-shi, Miyagi-ken 981-32
Email : komiyama@sddc.sps.mot.com
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