[Bug gas/21935] New: gas build error when using gcc 7

[bneumeier at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21935

            Bug ID: 21935
           Summary: gas build error when using gcc 7
           Product: binutils
           Version: 2.29
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: bneumeier at gmail dot com
  Target Milestone: ---

Created attachment 10332
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10332&action=edit
Fix a gas build error when using gcc 7

I found this only when doing an ARM-to-x86_64 cross-toolchain build, but
I presume it can occur in other circumstances as well.

When using gcc 7, config/tc-i386.c fails to compile because of a
compiler warning:

In function 'output_invalid':
9719:12: error: '%x' directive output may be truncated writing between 1
and 8 bytes into a region of size 5 [-Werror=format-truncation=]

This is similar to other issues I found corrected in binutils 2.29, e.g.
PR 21096, and I was able to fix it similarly by increasing the size of
the buffer slightly. Patch attached.

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