Sac-Epee Jean-Marc on Wed, 23 Jun 2010 22:28:59 +0200

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gp2c howto

Hi everybody,

I try to use gp2c... unsuccessfully for the moment.

1. For example, in a file named, I wrote the line

l=polroots(x^2-3*x+1); print(l);

2. In a console, I wrote

gp2c > test.c

The file test.c is :

#include <pari/pari.h>
void init_test(long prec);
/*End of prototype*/

static GEN l;
static GEN x;
/*End of global vars*/

init_test(long prec)      /* void */
  l = pol_x[fetch_user_var("l")];
  x = pol_x[fetch_user_var("x")];
  l = roots0(gaddgs(gsub(gsqr(x), gmulsg(3, x)), 1), 0, prec);
  pariprintf("%Z\n", l);

3. I run the usual Makefile (see below), and obtained :

[jmse@hal Pari]$ make
/usr/bin/gcc -c -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer -I. -I/usr/local/include test.c /usr/bin/gcc -o test-dyn -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer -Wl,--export-dynamic test.o -Wl,-rpath,/usr/local/lib -ldl -lm -L/usr/local/lib -lpari /usr/lib/gcc/i586-manbo-linux-gnu/4.3.2/../../../crt1.o: In function `_start': /home/qateam/rpm/BUILD/glibc-2.9/csu/../sysdeps/i386/elf/start.S:115: undefined reference to `main'
collect2: ld a retourné 1 code d'état d'exécution
make: *** [test-dyn] Erreur 1

Actually, the file test.c has no main procedure...

This the Makefile found in /usr/local/pari-2.3.4/examples, which run well with the file extgcd.c (in my Makefile, the line TARGET = extgcd is replaced with TARGET = test).

# Generic Makefile for PARI programs -- i686 running linux (ix86 kernel) 32-bit version
#  This file was created by Configure. Any change made to it will be
#  lost when Configure is run.
# make all will create
#  extgcd-dyn (linked dynamically with libpari)
#  extgcd-sta (linked statically)
# (to be used by "install" under GP)
# Under GP: install("extgcd", "GG&&", "gcdex", "./") enables
# you to subsequently use gcdex to call extgcd (see the reference manual).

# change this TARGET to compile your own programs
TARGET = test
SHELL  = /bin/sh

DBGFLAGS   = -g -Wall -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer
CFLAGS = -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer

# Various linkers use different flags to force static compilation. Choose
# the one which is relevant for your installation.
# Solaris ld (global)
#STATIC    = -dn

# Solaris ld (toggle: no shared object accepted until -B dynamic is seen
#STATIC    = -B static

# gcc
#STATIC    = -static

CC         = /usr/bin/gcc
CPPFLAGS   = -I. -I/usr/local/include
LD         = /usr/bin/gcc
LDFLAGS = -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer -Wl,--export-dynamic
MODLD       = /usr/bin/gcc
MODLDFLAGS  = -shared  $(CFLAGS) $(DLCFLAGS) -Wl,-shared
EXTRAMODLDFLAGS = -lc -ldl -lm -L/usr/local/lib -lpari

RUNPTH     = -Wl,-rpath,/usr/local/lib
LIBS       = -ldl -lm -L/usr/local/lib -lpari

RM = rm -f

DYN = lib$(TARGET).so
ALL = $(TARGET)-sta $(TARGET)-dyn $(DYN)

dft: $(TARGET)-dyn

all: $(ALL)

sta: $(TARGET)-sta

dyn: $(TARGET)-dyn

dynlib: $(DYN)

$(DYN): $(OBJS)

$(TARGET)-sta: $(OBJS)
    $(LD) -o $@ $(LDFLAGS) $< $(EXTRALIBS) $(STATIC) $(LIBS)

$(TARGET)-dyn: $(OBJS)
    $(LD) -o $@ $(LDFLAGS) $< $(RUNPTH) $(LIBS)

%.o: %.c
    $(CC) -c $(CFLAGS) $(CPPFLAGS) $(DLCFLAGS) $<
    -$(RM) *.o $(ALL)

For you, what is the problem in my process ?

Thanks for advance,


Jean-Marc Sac-Epée, Ingénieur de Recherches en Calcul Scientifique,
Laboratoire de Mathématiques, UMR 7122, Université de Metz,
Tél 03 87 54 72 69  Fax 03 87 31 52 73   mail: