Hi,
I'm attempting to create a shared library and application which uses
that shared library using the option -nostdlib, i.e. statically link in
the system libraries. I have created some link rules by past
experiences in this area and locating previous attempts by other users.
Here's the output of gmake, my environment, source files, ldd output,
and last few lines of strace output. To summarize, the library and
application seem to build correctly but then when I attempt to run the
application, I encounter a "Segmentation fault" - see strace output. I
first created the shared library and application without using -nostdlib
option and it ran correctly.
Any suggestions, etc. are appreciated - many thanks in advance.
Thanks.
-Chris
cborn@linux:~/workspace/cpptests> gmake
cd ./src && gmake all
gmake[1]: Entering directory `/home/cborn/workspace/cpptests/src'
g++ -o tutil.o -c tutil.cpp -g -I../include
g++ -O -v -shared -nostdlib -o libtestsl.so tutil.o -L/usr/lib `g++
--print-file-name=crt1.o` `g++ --print-file-name=crti.o` `g++
--print-file-name=crtbegin.o`
-L/usr/lib -Wl,-Bsymbolic -Wl,-Bdynamic -lm -lgcc_eh -lgcc -lc
-lgcc_eh -lgcc `
g++ --print-file-name=crtend.o` `g++ --print-file-name=crtn.o`
Reading specs from /usr/lib/gcc-lib/i586-suse-linux/3.3.1/specs
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/us
r/lib --enable-languages=c,c++,f77,objc,java,ada --disable-checking
--enable-libgcj --with-gxx-include-dir=/usr/include/g++
--with-slibdir=/lib --with-system-zlib --enable-shared
--enable-__cxa_atexit i586-suse-linux
Thread model: posix
gcc version 3.3.1 (SuSE Linux)
/usr/lib/gcc-lib/i586-suse-linux/3.3.1/collect2 --eh-frame-hdr -m
elf_i386 -shared -o libtestsl.so -L/usr/lib -L/usr/lib
-L/usr/lib/gcc-lib/i586-suse-linux/3.3.1
-L/usr/lib/gcc-lib/i586-suse-linux/3.3.1/../../../../i586-suse-linux/lib
-L/usr/lib/gcc-lib/i586-suse-linux/3.3.1/../../.. tutil.o
/usr/lib/gcc-lib/i586-suse-linux/3.3.1/../../../crt1.o
/usr/lib/gcc-lib/i586-suse-linux/3.3.1/../../../crti.o
/usr/lib/gcc-lib/i586-suse-linux/3.3.1/crtbegin.o -Bsymbolic -Bdynamic
-lm -lgcc_eh -lgcc -lc -lgcc_eh -lgcc
/usr/lib/gcc-lib/i586-suse-linux/3.3.1/crtend.o
/usr/lib/gcc-lib/i586-suse-linux/3.3.1/../../../crtn.o
g++ -o main.o -c main.cpp -g -I../include
g++ -o main main.o -nostdlib -Wl,-Bstatic -lstdc++ -g -I../include
-L../src -Wl,-Bdynamic -ltestsl -Wl,-Bstatic -lstdc++ -L/usr/lib `g++
--print-file-name=crt1.o` `g++ --print-file-name=crti.o` `g++
--print-file-name=crtbegin.o` -L/usr/lib
-Wl,-Bsymbolic -Wl,-Bdynamic -lm -lgcc_eh -lgcc -lc -lgcc_eh -lgcc
`g++ --print
-file-name=crtend.o` `g++ --print-file-name=crtn.o`
gmake[1]: Leaving directory `/home/cborn/workspace/cpptests/src'
Env:
cborn@linux:~/workspace/cpptests> uname -a
Linux linux 2.4.21-144-default #1 Fri Nov 14 00:01:36 UTC 2003 i686 i686
i386 GN
U/Linux
cborn@linux:~/workspace/cpptests> g++ -v
Reading specs from /usr/lib/gcc-lib/i586-suse-linux/3.3.1/specs
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib
--enable-languages=c,c++,f77,objc,java,ada --disable-checking
--enable-libgcj --with-gxx-include-dir=/usr/include/g++
--with-slibdir=/lib --with-system-zlib --enable-shared
--enable-__cxa_atexit i586-suse-linux
Thread model: posix
gcc version 3.3.1 (SuSE Linux)
Source:
cborn@linux:~/workspace/cpptests/src> cat main.cpp
#include <iostream>
using namespace std;
#include <tutil.h>
int main(int nArgc, const char **ppchArgv) {
cout << "About to call api in shared lib" << endl;
EchoTest("Call to shared library");
cout << "returned from api in shared lib" << endl;
exit(0);
}
cborn@linux:~/workspace/cpptests/src> cat tutil.cpp
#include <iostream>
#include <tutil.h>
using namespace std;
void EchoTest(const string& echo)
{
tutil testobj(echo);
}
tutil::tutil(const string& echo)
{
cout << echo << endl;
}
cborn@linux:~/workspace/cpptests/src> cat ../include/tutil.h
#ifndef __tutil_h_included__
#define __tutil_h_included__
#include <string>
using namespace std;
extern void EchoTest(const string& echo);
class tutil
{
protected:
string str_echo;
public:
tutil(const string& echo);
};
#endif//__tutil_h_included__
cborn@linux:~/workspace/cpptests/src>
cborn@linux:~/workspace/cpptests/src> ldd libtestsl.so
libm.so.6 => /lib/i686/libm.so.6 (0x40014000)
libc.so.6 => /lib/i686/libc.so.6 (0x40037000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
cborn@linux:~/workspace/cpptests/src> ldd main
libtestsl.so => libtestsl.so (0x4001a000)
libm.so.6 => /lib/i686/libm.so.6 (0x4002d000)
libc.so.6 => /lib/i686/libc.so.6 (0x40050000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
cborn@linux:~/workspace/cpptests/src>
strace output:
open("/home/db2inst1/sqllib/lib/libm.so.6", O_RDONLY) = -1 ENOENT (No such file
or directory)
stat64("/home/db2inst1/sqllib/lib", {st_mode=S_IFDIR|0755, st_size=3656, ...}) =
0
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=51245, ...}) = 0
old_mmap(NULL, 51245, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40020000
close(3) = 0
open("/lib/i686/libm.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0 5\0\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=183008, ...}) = 0
old_mmap(NULL, 142672, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4002d000
old_mmap(0x4004f000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x210
00) = 0x4004f000
close(3) = 0
open("tls/i686/mmx/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("tls/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("tls/mmx/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("tls/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("i686/mmx/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("mmx/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/home/db2inst1/sqllib/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file
or directory)
open("/lib/i686/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\320]\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1461208, ...}) = 0
old_mmap(NULL, 1256644, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40050000
old_mmap(0x4017c000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x12
c000) = 0x4017c000
old_mmap(0x40181000, 7364, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONY
MOUS, -1, 0) = 0x40181000
close(3) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0
x40183000
mprotect(0x4001a000, 20480, PROT_READ|PROT_WRITE) = 0
mprotect(0x4001a000, 20480, PROT_READ|PROT_EXEC) = 0
munmap(0x40020000, 51245) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
cborn@linux:~/workspace/cpptests/src>
