Anton Shterenlikht wrote:
On Thu, Jun 05, 2008 at 06:29:35AM -0700, Tobias Hoellrich wrote:
I use two different fortran90 compiler on a simple input file
and get executables which differ in size by almost 3 orders of
magnitude, see below. Is this something to do with the use
of shared libraries?
Run "file" and "ldd" on the executables to see the difference:
[EMAIL PROTECTED] ~]# file `which ls`
/bin/ls: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD),
for FreeBSD 8.0 (800038), dynamically linked (uses shared libs),
FreeBSD-style, stripped
[EMAIL PROTECTED] ~]# ldd `which ls`
/bin/ls:
libutil.so.7 => /lib/libutil.so.7 (0x28082000)
libncurses.so.7 => /lib/libncurses.so.7 (0x28090000)
libc.so.7 => /lib/libc.so.7 (0x280cf000)
[EMAIL PROTECTED] ~]#
Many thanks, the ldd resuts differ,
but how does this translate into size?
% ls -al *out
-rwxr-xr-x 1 mexas wheel 546413 5 Jun 14:39 g95.out
-rwxr-xr-x 1 mexas wheel 9179 5 Jun 14:39 gf42.out
% file *out
g95.out: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD),
for FreeBSD 7.0 (700109), dynamically linked (uses shared libs),
FreeBSD-style, not stripped
gf42.out: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD),
for FreeBSD 7.0 (700109), dynamically linked (uses shared libs),
FreeBSD-style, not stripped
Both files have debugging symbols enabled. You can remove these with
strip, at the cost of not being able to use gdb to obtain backtraces if
you run into a bug.
% ldd *.out
g95.out:
libm.so.5 => /lib/libm.so.5 (0x280c5000)
libc.so.7 => /lib/libc.so.7 (0x280db000)
^-- this one doesn't link to a dynamic fortran library, so it is
presumably statically linked, explaining the size. Look into how the
file was constructed (e.g. the command used to link the binary).
gf42.out:
libgfortran.so.2 => /usr/local/lib/gcc-4.2.4/libgfortran.so.2
(0x2807e000)
libm.so.5 => /lib/libm.so.5 (0x28103000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x28119000)
libc.so.7 => /lib/libc.so.7 (0x28124000)
%
Kris
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