Bug 168252 - gfortran does not SAVE EQUIVALENCE variables
Summary: gfortran does not SAVE EQUIVALENCE variables
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: gcc
Version: 4
Hardware: i386
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2005-09-13 22:35 UTC by Stephen Walton
Modified: 2007-11-30 22:11 UTC (History)
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Last Closed: 2005-09-27 21:50:44 UTC


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Description Stephen Walton 2005-09-13 22:35:10 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050720 Fedora/1.0.6-1.1.fc4 Firefox/1.0.6

Description of problem:
This is a report to Fedora Core 4 of the bug which is also at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18518.  The basic problem is that in code like the following:

subroutine foo
integer g, h
save g
equivalence (g,h)

the value of h is not SAVE'd.

Version-Release number of selected component (if applicable):
gcc-gfortran-4.0.1-4.fc4

How reproducible:
Always

Steps to Reproduce:
1.  Create the following routine foo.f90:

subroutine foo
  integer i,g,h
  data i/0/
  equivalence (g,h)
  save g
  if (i == 0) then
     i = 1
     h = 12345
  end if
  print *,h
end subroutine foo

2. Compile with "gfortran -S foo.f90"
3. Look at assembly output f90.s.
  

Actual Results:  The value 12345 is being put into a stack location.

Expected Results:  The value 12345 should be put into the same memory location occupied by the variable g.

Additional info:

Comment 1 Jakub Jelinek 2005-09-27 21:50:44 UTC
Fixed in GCC HEAD:
http://gcc.gnu.org/ml/gcc-patches/2005-09/msg01735.html
and approved for 4.0.x when it reopens.


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