/usr/bin/ld.real: unrecognised emulation mode: 64

[milosavpejic]

I have problems,I get this:
milenko@hp6830s:~/mt2ddi$ make mt2ddi
f77 -o -m64 driver.o solve_mt2d_direct.o boem.o rotz.o gebolr.o d2emod.o pobo.o mte.o d2hmod.o gsres.o mth.o z1idu.o h1iud.o phase.o
/usr/bin/ld.real: unrecognised emulation mode: 64
Supported emulations: elf_x86_64 elf_i386 i386linux
collect2: ld returned 1 exit status
My makefile:
FFLAGS = -O4 -g
#CFLAGS = -O -I/usr/openwin/include
CFLAGS = -O
LDFLAGS= -L/usr/lib/libf2c.a -m64


#
#rules for compiling .f files:
#
.f.o:
$(COMPILE.f) $(FFLAGS) $< $(INCS)
.c.o:
$(COMPILE.c) $(CFLAGS) $< $(INCS)
#---------------------------------------------------------------------------
#
# Source objects
#
MT2DDI_OBJS= driver.o solve_mt2d_direct.o boem.o rotz.o gebolr.o d2emod.o pobo.o mte.o d2hmod.o gsres.o mth.o z1idu.o h1iud.o phase.o
#
# Executable name
#
MT2DDI_EXEC=$(EXEDIR)/mt2ddi
#
mt2ddi: $(MT2DDI_EXEC)
$(MT2DDI_EXEC): ${MT2DDI_OBJS}
f77 -o -m64 ${MT2DDI_OBJS}
mv main ${MT2DDI_EXEC}

[drl]

Hi.

The f77 command is very old. It was not found on any of the current Linux systems I use: SuSE, CentOS (RedHat), Fedora, Debian, Ubuntu. Try instead:

gfortran -o a.out -m64 ${MT2DDI_OBJS}

Note that -o for the modern gcc compile sequence usually takes an argument:

       -o file
           Place output in file file.  This applies regardless to whatever
           sort of output is being produced, whether it be an executable file,
           an object file, an assembler file or preprocessed C code.
-- excerpt from man gcc

In any case, please tell us what Linux you are using. For example, I most often use:

OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 (lenny) 
gfortran GNU Fortran (Debian 4.3.2-1.1) 4.3.2

Best wishes ... cheers, drl

[milosavpejic]

Thanks drl.Well it is same with gfortran.
2.6.28-19-generic
Architecutre is x86_64,I think that I have problem with fortran libraires(64bit issue) so now I am tring to install libf2c2-dev_20090411-2_amd64.

[milosavpejic]

/usr/lib/gcc/x86_64-linux-gnu/4.3.3/libgfortranbegin.a(fmain.o): In function `main':
(.text+0x2: undefined reference to `MAIN__'
collect2: ld returned 1 exit status
This is what i now get.
Any ideas?

[drl]

Hi.

Here is a script to show characteristics of a gfortran run. The first part shows the environment, the last part the results:

#!/usr/bin/env bash

# @(#) s1 Demonstrate gfortran compile, link, execute.

# Section 1, setup, pre-solution.
# Infrastructure details, environment, commands for forum posts.
# Uncomment export command to test script as external user.
# export PATH="/usr/local/bin:/usr/bin:/bin"
set +o nounset
pe() { for i;do printf "%s" "$i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
C=$HOME/bin/context && [ -f $C ] && . $C gfortran
set -o nounset
pe

# Section 2, display file.
# Display sample of data file, with head & tail as a last resort.
pe " || start [ first:middle:last ]"
specimen main.f suba.f \
|| { pe "(head/tail)"; head -n 5 main.f suba.f pe " ||"; tail -n 5 main.f suba.f ; }
pe " || end"

# Section 3, solution.

pl " Results, object files are:"
rm -f *.o a.out
gfortran -c *.f
gfortran *.o
file *.o

pl " Output from executable:"
./a.out

pl " Libraries used by this executable:"
ldd a.out

exit 0

producing:

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 (lenny) 
GNU bash 3.2.39
gfortran GNU Fortran (Debian 4.3.2-1.1) 4.3.2

 || start [ first:middle:last ]
Whole: 5:0:5 of 4 lines in file "main.f"
      program main
      write(6,*) " Hello, world from main."
	  call a
      end

Whole: 5:0:5 of 3 lines in file "suba.f"
      subroutine a
      write(6,*) " Hello, world from subroutine a."
      end
 || end

-----
 Results, object files are:
main.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
suba.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped

-----
 Output from executable:
  Hello, world from main.
  Hello, world from subroutine a.

-----
 Libraries used by this executable:
	linux-vdso.so.1 =>  (0x00007fffffffe000)
	libgfortran.so.3 => /usr/lib/libgfortran.so.3 (0x00007f8b8a998000)
	libm.so.6 => /lib/libm.so.6 (0x00007f8b8a715000)
	libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f8b8a4fe000)
	libc.so.6 => /lib/libc.so.6 (0x00007f8b8a1ab000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f8b8ac73000)

Good luck ... cheers, drl