Bug 47057

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User-Agent: Mozilla/4.77 [en] (X11; U; Linux 2.4.3-12 i686)

Description of problem:
Compiling a fortran code with obviously uninitialized variables under the
-Wall option should result in warning messages. Indeed this is true in many
cases, but the same exact code with the -fno-automatic
option does no longer give any warning (wrong of course). This is true
also if the SAVE statement is put into the code (this is consistent since
SAVE should perform the same as -fno-automatic)

The attached tar file contains a script, dobug, and two extremely short
fortran examples showing the problem

How reproducible:
Always

Steps to Reproduce:
1.untar the example
2.run dobug
3.look at the results
	

Actual Results:  no warning is issued for the second and third examples,
while both should result in the same warnings as of the first example.
The 4th example (bug3.f) reults in only two warnings out of the required 4,
showing that all variables which are SAVEd are for some reason no longer
subject to the checks about initialization

Expected Results:  all four examples should issue warnings about all non
initialized variables

Additional info:

the problem is particular nasty when compiling large codes where the
-fno-automatic option is required or where anyway some variables must be
SAVEd. In the present version, g77 systematically misses unitialized
variables with obvious consequences. The problem bubbled up when the same
code was compiled under IM-AIX and Compaq TrueUnix
or whatever is now the name of Digital Unix, which both exposed some typos
which went unobserved under RH7.1.