http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56748
Bug #: 56748
Summary: STOP statement + array optional variable causes bogus
uninitialized warning
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: towns...@astro.wisc.edu
Created attachment 29736
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29736
Sample code producing bogus warning
In the attached code, compilation with the following args:
gfortran -O2 -fcheck=all -Wall -c test_uninit.f90
...produces the following warning:
test_uninit.f90: In function ‘mysub’:
test_uninit.f90:13:0: warning: ‘b.0’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
print *, b
^
The warning goes away if any of the following modifications are made:
*) any of the compilation flags is omitted
*) the stop statement in the code is commented out
*) the variable 'b' is made non-optional (and the PRESENT check is removed)
*) the variable 'b' is made a scalar
gfortran -v:
Using built-in specs.
COLLECT_GCC=/Applications/madsdk/bin/gfortran.exec
COLLECT_LTO_WRAPPER=/Applications/madsdk/libexec/gcc/x86_64-apple-darwin11.4.2/4.8.0/lto-wrapper
Target: x86_64-apple-darwin11.4.2
Configured with: ./configure CC='gcc -D_FORTIFY_SOURCE=0'
--build=x86_64-apple-darwin11.4.2 --prefix=/Applications/madsdk
--with-gmp=/Applications/madsdk --with-mpfr=/Applications/madsdk
--with-mpc=/Applications/madsdk --enable-languages=c,c++,fortran
--disable-multilib
Thread model: posix
gcc version 4.8.0 20130314 (experimental) (GCC)
