[Opengrads-devel] Optimization problems on Ubuntu x86_64?

[Arlindo da S. <da...@al...>]

Jennifer,

  I am having a bit of trouble building "a3" on Ubuntu x86_64, with
either our old build or your new one. Here is what I have:

- Linux Niteroi 2.6.24-19-generic #1 SMP Fri Jul 11 21:01:46 UTC 2008
x86_64 GNU/Linux
- gcc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7)
- ldd grads
	linux-vdso.so.1 =>  (0x00007fff5c3fe000)
	libX11.so.6 => /usr/lib/libX11.so.6 (0x00002b754e94a000)
	libm.so.6 => /lib/libm.so.6 (0x00002b754ec4d000)
	libc.so.6 => /lib/libc.so.6 (0x00002b754eece000)
	libxcb-xlib.so.0 => /usr/lib/libxcb-xlib.so.0 (0x00002b754f231000)
	libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00002b754f432000)
	libdl.so.2 => /lib/libdl.so.2 (0x00002b754f64d000)
	/lib64/ld-linux-x86-64.so.2 (0x00002b754e72b000)
	libXau.so.6 => /usr/lib/libXau.so.6 (0x00002b754f852000)
	libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00002b754fa54000)

I am getting segfaults when opening a netcdf file, with either "grads"
or "gradap":

ga-> sdfopen data/model.nc
Scanning self-describing file:  data/model.nc

Program received signal SIGSEGV, Segmentation fault.
read_metadata (pfi=0xadf270) at ./gasdf.c:2270
2270	    pvar->offset = 0;

Usually everything is compiled with "-g -O2", and this gives me the
error above. Now, if I set

export CFLAGS="-g"
./configure

everything compiles with "-g" (no -O2), and now everything works.

BTW, your Ubuntu binary works. So, it could be a supplib issue or a
gcc optimization problem. (I rebuilt the supplibs to be sure, and it
did not make a difference).

Which version of Ubuntu/gcc are you using?

    Arlindo

-- 
Arlindo da Silva
da...@al...