With GNU Fortran 95 (GCC) 4.3.0 20070125 (experimental), the programme
program main
integer size
integer*1 var
open (10, file="conftestval", status="unknown")
inquire (iolength=size) var
write (10, *) size
close (10)
end
compiled with the options
/Users/eschnett/gcc/bin/gfortran -o conftest conftest.f -malign-double
leads to a bus error:
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00002ff8
0x0025ca38 in *__gfortran_st_iolength (dtp=0xbffff0c0) at
/Users/eschnett/src/gcc/libgfortran/io/transfer.c:2630
2630 *dtp->iolength = 0;
The problem seems to be that struct st_parameter_dt changes its layout
depending on whether -malign-double is in effect or not, making the compiled
programme incompatible with the run-time library.
I see two solutions: Either this struct should be modified so that it is
independent of -malign-double, or the compiler should take special measures
when building the tree for this structure, making sure to use standard
alignments. Since I don't know how to build trees with non-standard
alignments, I will send a patch that permutes the elements st_parameter_dt.
--
Summary: Calling inquire (iolength) crashes with -malign-double
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: schnetter at aei dot mpg dot de
GCC build triplet: i386-apple-darwin8.8.1
GCC host triplet: i386-apple-darwin8.8.1
GCC target triplet: i386-apple-darwin8.8.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30594
