gcc/configure failures

[Tony Kimball]

Summary: One problem resolved, and a distinct problem observed.

Quoth Zack Weinberg on Tuesday, 3 April:
: 
: You should never have hit that test; Redhat 7 ought to have a C89
: compliant <limits.h>. 

Thank you.  Your observation prompted me to check versions, and I
found the OS install to be in a disorganized state, which was easy to
rectify.  The crucial issue in this case was a missing soft link,
/usr/include/linux.

: But it should work, anyway....
: Please post the config.log found in /home/anon/objdir/gcc.

When CHAR_BIT was undefined, config.log resulted as follows: