I attached a short code that produces segmentation faults (or strange cygwin
errors). The segmentation faults only occur when compiling with both
-funroll-loops and -O3. If one or the other or neither are used, the program
runs fine. The code has several examples. I attached a stackdump for the case
of the three write statements.
System : WinXP, cygwin, gcc version 4.3.0 20080212 (experimental)
==============================
subroutine test_sub(label)
character(len=*),intent(in) :: label
character (len=(len(label)+20)) :: c1
character (len=(len(label)+20)) :: c2
character (len=(len(label)+20)) :: c3
! the below 3 lines cause a segmentation fault
! print*, len(c1)
! print*, len(c2)
! print*, len(c3)
! the below 2 lines produce strange cygwin errors
! a ### sig_send: wait for sig_complete event failed, signal -34, rc
-1, Win32 error 6
! print*, len(c1)
! print*, len(c2)
! the below 1 lines produces no problem
! print*, len(c3)
! the below 3 lines cause a segmentation fault (I gave the stackdump for this
case)
write(c1,'(A)') 'a'
write(c2,'(A)') 'b'
write(c3,'(A)') 'c'
! the below 2 lines produce strange cygwin erros
! a ### sig_send: wait for sig_complete event failed, signal -34, rc
-1, Win32 error 6
! write(c1,'(A)') 'a'
! write(c2,'(A)') 'b'
! the below 1 lines produces no problem
! write(c1,'(A)') 'a'
end subroutine test_sub
!======================
program test
call test_sub('a')
print*, 'done'
end program test
!======================
--
Summary: Segmentation fault with character strings only when
compiling with -funroll-loops and -O3
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: john dot young at jrc dot co dot jp
GCC target triplet: i686-pc-cywgin
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35952
