For source code see attachment. The source came
from http://www.netlib.org/blas/d1mach.f .
For new code, this should not be an ussue, because
these numbers are supplied by the front end. Old
code from sources like netlib relies on these routines,
and it's a pain to have to change them.
$ gfortran -v
Reading specs from /home/zfkts/lib/gcc/ia64-unknown-linux-gnu/4.0.0/specs
Configured with: ../gcc-4.0-20041107/configure --prefix=/home/zfkts
--enable-languages=c,c++,f95
Thread model: posix
gcc version 4.0.0 20041107 (experimental)
$ gfortran d1mach.f && ./a.out
2.225073858507201E-308
0.00000000000000
3.182993687584259E-313
2.121995792447469E-314
0.301029995663981
$ g77 d1mach.f && ./a.out
2.22507386E-308
1.79769313E+308
1.11022302E-16
2.22044605E-16
0.301029996
$ ifort d1mach.f && ./a.out
2.225073858507201E-308
1.797693134862316E+308
1.110223024625157E-016
2.220446049250313E-016
0.301029995663981
--
Summary: d1mach(4) (BLAS) broken, g77 regression
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: Thomas dot Koenig at online dot de
CC: gcc-bugs at gcc dot gnu dot org
GCC host triplet: ia64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18518
