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* [Bug fortran/47030] New: !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA
@ 2010-12-21 10:49 burnus at gcc dot gnu.org
2010-12-27 23:34 ` [Bug fortran/47030] " dfranke at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: burnus at gcc dot gnu.org @ 2010-12-21 10:49 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47030
Summary: !GCC$ Attributes do not work for COMMON variables in
procedures and BLOCK DATA
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: burnus@gcc.gnu.org
Cf. report by Arjen Markus at
http://gcc.gnu.org/ml/fortran/2010-12/msg00124.html -- There is also a Windows
example.
Under Linux DLLEXPORT is not supported and thus there is a warning, which makes
testing very convenient. If I do now:
!-------------------------
subroutine print
real :: x
!GCC$ attributes dllexport :: mydata
common /mydata/ x
write(*,*) 'X = ', x
end subroutine print
!-------------------------
it simply compiles - i.e. the DLLEXPORT is ignored. However, if I use:
!-------------------------
module m
real :: x
common /mydata/ x
!GCC$ attributes dllexport :: mydata
end module
!-------------------------
I get the warning:
f951: warning: ‘dllexport’ attribute directive ignored [-Wattributes]
Which directly implies that the attribute it not taken into account for COMMON
blocks defined in SUBROUTINE/FUNCTION.
Same problem for BLOCK DATA: No warning for
block data
real alpha, beta
common /vector/ alpha,beta
data alpha/3.14/, beta/2.71/
!GCC$ attributes dllexport :: vector
end
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug fortran/47030] !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA
2010-12-21 10:49 [Bug fortran/47030] New: !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA burnus at gcc dot gnu.org
@ 2010-12-27 23:34 ` dfranke at gcc dot gnu.org
2011-01-07 23:21 ` burnus at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: dfranke at gcc dot gnu.org @ 2010-12-27 23:34 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47030
Daniel Franke <dfranke at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dfranke at gcc dot gnu.org
--- Comment #1 from Daniel Franke <dfranke at gcc dot gnu.org> 2010-12-27 23:34:45 UTC ---
Is this related to/dupe of PR42568?
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug fortran/47030] !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA
2010-12-21 10:49 [Bug fortran/47030] New: !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA burnus at gcc dot gnu.org
2010-12-27 23:34 ` [Bug fortran/47030] " dfranke at gcc dot gnu.org
@ 2011-01-07 23:21 ` burnus at gcc dot gnu.org
2012-03-02 22:18 ` eh.toussaint at gmail dot com
2015-10-21 12:53 ` dominiq at lps dot ens.fr
3 siblings, 0 replies; 5+ messages in thread
From: burnus at gcc dot gnu.org @ 2011-01-07 23:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47030
--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-01-07 22:22:15 UTC ---
Created attachment 22930
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22930
Draft patch
Draft patch attached (untested).
TODO: Warn if the same COMMON block has different ext_attr in different scopes
of the same translation unit.
* * *
(In reply to comment #1)
> Is this related to/dupe of PR42568?
No - those are different issues.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug fortran/47030] !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA
2010-12-21 10:49 [Bug fortran/47030] New: !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA burnus at gcc dot gnu.org
2010-12-27 23:34 ` [Bug fortran/47030] " dfranke at gcc dot gnu.org
2011-01-07 23:21 ` burnus at gcc dot gnu.org
@ 2012-03-02 22:18 ` eh.toussaint at gmail dot com
2015-10-21 12:53 ` dominiq at lps dot ens.fr
3 siblings, 0 replies; 5+ messages in thread
From: eh.toussaint at gmail dot com @ 2012-03-02 22:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47030
Erik Toussaint <eh.toussaint at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |eh.toussaint at gmail dot
| |com
--- Comment #3 from Erik Toussaint <eh.toussaint at gmail dot com> 2012-03-02 22:17:52 UTC ---
(In reply to comment #0)
For both program units, if I add 'implicit none' I get the following error:
!GCC$ attributes dllexport :: mydata
1
Error: Symbol 'mydata' at (1) has no IMPLICIT type
So 'mydata' is treated as the identifier of a local entity. Which makes sense,
because a common block and a local entity can have the same name (with certain
restrictions; see 16.3.1 and 16.3.2 in f2008).
Looking at the syntax of the Intel Fortran compiler, the name of the common
block has to be between slashes:
!DEC$ ATTRIBUTES DLLEXPORT :: /X/
http://software.intel.com/sites/products/documentation/hpc/compilerpro/en-us/fortran/win/compiler_f/bldaps_for/win/bldaps_share_datadlls.htm
Trying this with gfortran gives an error:
!GCC$ attributes dllexport :: /mydata/
1
Error: Invalid character in name at (1)
P.s.:
> !-------------------------
> module m
> real :: x
> common /mydata/ x
> !GCC$ attributes dllexport :: mydata
> end module
> !-------------------------
>
> I get the warning:
>
> f951: warning: ‘dllexport’ attribute directive ignored [-Wattributes]
I get an error (I'm using MinGW GCC 4.6.2):
m.f90:5:0: error: external linkage required for symbol 'mydata' because of
'dlle
xport' attribute
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug fortran/47030] !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA
2010-12-21 10:49 [Bug fortran/47030] New: !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA burnus at gcc dot gnu.org
` (2 preceding siblings ...)
2012-03-02 22:18 ` eh.toussaint at gmail dot com
@ 2015-10-21 12:53 ` dominiq at lps dot ens.fr
3 siblings, 0 replies; 5+ messages in thread
From: dominiq at lps dot ens.fr @ 2015-10-21 12:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47030
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2015-10-21
Ever confirmed|0 |1
--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Compiling the first test with -Wall gives the warning
!GCC$ attributes dllexport :: mydata
1
Warning: Unused variable 'mydata' declared at (1) [-Wunused-variable]
for 5.2.0 and 6.0, without ' [-Wunused-variable]' for 4.8 and 4.9.
Compiling the second test gives
f951: warning: 'dllexport' attribute directive ignored [-Wattributes]
for 4.8 and 4.9 and an ICE for 5.2.0 and 6.0 (pr68040).
I don't get any warning for the third test for 4.8 up to trunk (6.0).
^ permalink raw reply [flat|nested] 5+ messages in thread
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2010-12-21 10:49 [Bug fortran/47030] New: !GCC$ Attributes do not work for COMMON variables in procedures and BLOCK DATA burnus at gcc dot gnu.org
2010-12-27 23:34 ` [Bug fortran/47030] " dfranke at gcc dot gnu.org
2011-01-07 23:21 ` burnus at gcc dot gnu.org
2012-03-02 22:18 ` eh.toussaint at gmail dot com
2015-10-21 12:53 ` dominiq at lps dot ens.fr
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