http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57127
Bug #: 57127
Summary: gfortran gives unintended warning on uninitialized
optional dummy array of undetermined size
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: astrofl...@gmail.com
Created attachment 29985
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29985
Source file example.f90 used in the example in the bug report
gfortran-4.7.2 -O1 -Wall gives unintended warning about uninitialized array
elements when a routine is called with an optional dummy array of undetermined
size (example.f90 is attached below):
$ gfortran -O1 -Wall example.f90 -o example && ./example
example.f90: In function ‘example_routine’:
example.f90:8:0: warning: ‘array.0’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
Expected behaviour: no warning message.
The warning goes away when:
* -O0 is used rather than -O1 or higher
* -Wall is replaced by -Wmaybe-uninitialized
* the line write(op,'(A)') 'foo' is commented out
