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autoconf 2.70 build warnings

autoconf 2.70 was released on December 8th 2020 and brings quite a few changes, some are not backward compatible. The release note is here:

https://lwn.net/Articles/839395/

Building kea has a quite a few warnings from configure.ac.

Sample warnings:

  • configure.ac:211: warning: The macro `AC_HELP_STRING' is obsolete.
  • configure.ac:211: warning: The macro `AC_TRY_LINK' is obsolete.
  • configure.ac:344: warning: The macro `AC_TRY_COMPILE' is obsolete.
  • configure.ac:583: warning: The macro `AC_TRY_RUN' is obsolete.
  • configure.ac:625: warning: AC_CHECK_HEADERS(${HEADER_TO_CHECK}): you should use literals
  • configure.ac:1289: warning: AC_PROG_LEX without either yywrap or noyywrap is obsolete
Edited by Gene C
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