🚀 go-pugleaf

When I try to create a shared library under HPUX10.01 and gcc-2.7.2,
I get the message:

/usr/bin/ld: DP-Relative Code in file /var/tmp/cca04159.o - Shared Library must be Position-Independent 

I believe that the problem is with collect, where the .o file that
collect builds is not being built with -fpic or -fPIC.

Here's how to reproduce this bug.

Create a trivial file:

cxh@hewlett 21% echo "int f() { return 1;}" > fn.c

Create a .o file with -fPIC

cxh@hewlett 22% gcc -fPIC -v -c fn.c
Reading specs from /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/specs
gcc version 2.7.2
 /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/cpp -lang-c -v -undef -D__GNUC__=2 -D__GNUC_MINOR__=7 -Dhppa -Dhp9000s800 -D__hp9000s800 -Dhp9k8 -DPWB -Dhpux -Dunix -D_HPUX_SOURCE -D__hppa__ -D__hp9000s800__ -D__hp9000s800 -D__hp9k8__ -D__PWB__ -D__hpux__ -D__unix__ -D_HPUX_SOURCE -D__hppa -D__hp9000s800 -D__hp9k8 -D__PWB -D__hpux -D__unix -Asystem(unix) -Asystem(hpux) -Acpu(hppa) -Amachine(hppa) -D__hp9000s700 -D_PA_RISC1_1 fn.c /tmp/cca04211.i
GNU CPP version 2.7.2 (hppa)
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /users/ptdesign/gnu/hppa/hppa1.1-hp-hpux10.01/include
 /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/include
 /usr/include
End of search list.
 /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/cc1 /tmp/cca04211.i -quiet -dumpbase fn.c -version -fPIC -o /tmp/cca04211.s
GNU C version 2.7.2 (hppa) compiled by GNU C version 2.7.2.
 /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/as -o fn.o /tmp/cca04211.s

Try to create a shared library:

cxh@hewlett 23% gcc -v -shared -Wl,-debug -o /tmp/libfn.sl fn.o
Reading specs from /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/specs
gcc version 2.7.2
 /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/ld -b -o /tmp/libfn.sl -L/users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2 -L/users/ptdesign/gnu/hppa/lib -debug fn.o
collect2 version 2.7.2 (hppa)
ld_file_name        = /usr/bin/ld
c_file_name         = /users/ptdesign/bin.hppa/gcc
nm_file_name        = /usr/sww/bin/gnm
ldd_file_name       = /usr/bin/chatr
strip_file_name     = /usr/sww/bin/gstrip
c_file              = /tmp/cca04216.c
o_file              = /tmp/cca04216.o
COLLECT_NAMES       = /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/ld
COLLECT_GCC_OPTIONS = -v -shared -o /tmp/libfn.sl
COLLECT_GCC         = gcc
COMPILER_PATH       = /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/:/users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/:/usr/lib/gcc/hppa1.1-hp-hpux10.01/2.7.2/:/usr/lib/gcc/hppa1.1-hp-hpux10.01/:/users/ptdesign/gnu/hppa/hppa1.1-hp-hpux10.01/bin/hppa1.1-hp-hpux10.01/2.7.2/:/users/ptdesign/gnu/hppa/hppa1.1-hp-hpux10.01/bin/
LIBRARY_PATH        = /users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2/:/usr/lib/gcc/hppa1.1-hp-hpux10.01/2.7.2/:/users/ptdesign/gnu/hppa/hppa1.1-hp-hpux10.01/lib/hppa1.1-hp-hpux10.01/2.7.2/:/users/ptdesign/gnu/hppa/hppa1.1-hp-hpux10.01/lib/:/users/ptdesign/gnu/hppa/lib/hppa1.1-hp-hpux10.01/2.7.2/:/users/ptdesign/gnu/hppa/lib/:/lib/hppa1.1-hp-hpux10.01/2.7.2/:/lib/:/usr/lib/hppa1.1-hp-hpux10.01/2.7.2/:/usr/lib/

/usr/bin/ld -b -o /tmp/libfn.sl -L/users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2 -L/users/ptdesign/gnu/hppa/lib fn.o
 /usr/sww/bin/gnm -p /tmp/libfn.sl

nm output with constructors/destructors.

 /usr/bin/chatr /tmp/libfn.sl

ldd output with constructors/destructors.

0 constructor(s) found
0 destructor(s)  found
[Leaving /tmp/libfn.sl]

write_c_file - output name is /tmp/libfn.sl, prefix is libfn_sl

========== output_file = /tmp/libfn.sl, c_file = /tmp/cca04216.c

write_c_file - output name is /tmp/libfn.sl, prefix is libfn_sl
static int count;
typedef void entry_pt();
void _GLOBAL__FI_libfn_sl() {
     ++count;
}
void _GLOBAL__FD_libfn_sl() {
}
void _GLOBAL__DI() {
     _GLOBAL__FI_libfn_sl();
}
void _GLOBAL__DD() {
    _GLOBAL__FD_libfn_sl();
}
========== end of c_file

/users/ptdesign/bin.hppa/gcc -c -o /tmp/cca04216.o /tmp/cca04216.c
/usr/bin/ld -b -o /tmp/libfn.sl -L/users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2 -L/users/ptdesign/gnu/hppa/lib fn.o /tmp/cca04216.o
/usr/bin/ld: DP-Relative Code in file /tmp/cca04216.o - Shared Library must be Position-Independent 
collect2: ld returned 1 exit status
[Leaving /tmp/cca04216.c]
[Leaving /tmp/cca04216.o]
[Leaving /tmp/cca04216.x]
[Leaving /tmp/cca04216.ld]
[Leaving /tmp/libfn.sl]
cxh@hewlett 24%


As a workaround, compile the interim .c file that collect produced with -fPIC:

cxh@hewlett 24% /users/ptdesign/bin.hppa/gcc -fPIC -c -o /tmp/cca04216.o /tmp/cca04216.c

Run the linker by hand:

cxh@hewlett 25% /usr/bin/ld -b -o /tmp/libfn.sl -L/users/ptdesign/gnu/hppa/lib/gcc-lib/hppa1.1-hp-hpux10.01/2.7.2 -L/users/ptdesign/gnu/hppa/lib fn.o /tmp/cca04216.o

The shared library is produced:

cxh@hewlett 26% file libfn.sl
libfn.sl:       s800 shared library -not stripped

From collect.c, I can see that collect reads environment variables
that get passed from the parent gcc, but I can't seem to override
them.  

Am I dropping a bit here?  The same commands work with gcc-2.7.2 under
Solaris2.4, which does not use collect, and SunOS4.1.3, which does use
collect.

-Christopher

Christopher Hylands, Ptolemy Project Manager  University of California
cxh@eecs.berkeley.edu 			      US Mail: 558 Cory Hall #1770
ph: (510)643-9841 fax:(510)642-2739	      Berkeley, CA 94720-1770
home: (510)526-4010 (if busy -4068)	      (Office: 493 Cory)