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[RFH] Uninitialized warning as error is disabled on the trunk

  I noticed today that we actually currently just warn and not error
out while compiling GCC for uninitialized warnings.
While doing a build I got the following warning:
/src/gcc/local/gcc/gcc/cp/pt.c: In function 'subst_copy':
/src/gcc/local/gcc/gcc/cp/pt.c:9919: warning: 'len' may be used
uninitialized in this function

I looked into the code and could not figure out how to fix it as I
don't understand how variable argument templates should work here.

I also looked to figure out how to fix this so we get an error next
time and made this patch:
Index: gcc/system.h
--- gcc/system.h	(revision 133718)
+++ gcc/system.h	(working copy)
@@ -802,7 +802,7 @@ extern void fancy_abort (const char *, i
 #pragma GCC diagnostic warning "-Wcast-qual"
 /* If asserts are disabled, activate -Wuninitialized as a warning (not
    an error/-Werror).  */
 #pragma GCC diagnostic warning "-Wuninitialized"

Hopefully someone can look into the warning and fix it and also apply
the patch to system.h after the warning has been fixed.

Andrew Pinski

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