[Bug backtrace/31607] New: zstdtest.c: ZSTD_CLEVEL_DEFAULT undeclared

["radu.git at Mergesium dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31607

            Bug ID: 31607
           Summary: zstdtest.c: ZSTD_CLEVEL_DEFAULT undeclared
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: backtrace
          Assignee: unassigned at sourceware dot org
          Reporter: radu.git at Mergesium dot com
  Target Milestone: ---

Created attachment 15450
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15450&action=edit
patch to define the missing ZSTD_CLEVEL_DEFAULT macro

Hello,

Running 'make check' on Ubuntu 16.04 where libzstd-dev 1.3.1 is installed,
fails with the error:

  /tmp/gdb/libbacktrace/zstdtest.c: In function 'test_large':
  /tmp/gdb/libbacktrace/zstdtest.c:383:8: error: 'ZSTD_CLEVEL_DEFAULT'
undeclared (first use in this function)
        ZSTD_CLEVEL_DEFAULT);

The error is in libbacktrace.

This is because ZSTD_CLEVEL_DEFAULT was not defined in zstd.h until version
1.3.6, where it is a fallback in case the application does not define it.

The attached patch sets ZSTD_CLEVEL_DEFAULT to 3 before including zstd.h, which
allows gdb to build on older ZSTD libraries, as well as keep a
consistent compression level when built with newer libraries.

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