[Bug c++/17393] [3.4/4.0 Regression] "unused variable '._0'" warning with -Wall

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-09-10 15:56 -------
That's related to the new parser. The problem with the warning is 
that gcc tries to make some sense out of your wrong code and 
introduces an unnamed variable for something it tried on the broken 
declaration, and this unnamed variable is later found to be unused. 
 
I wouldn't rate this as a regression: we give a sensible error message, 
and this is a follow-up error. It could be rated as error-recovery. If 
it were just me, I would close this PR as WONTFIX, but I leave this 
to others. 
 
W. 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17393