ast_prog_sed.m4 976 B

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  1. # AST_PROG_SED
  2. # -----------
  3. # Check for a fully functional sed program that truncates
  4. # as few characters as possible. Prefer GNU sed if found.
  5. AC_DEFUN([AST_PROG_SED],
  6. [AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
  7. [dnl ac_script should not contain more than 99 commands (for HP-UX sed),
  8. dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
  9. ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
  10. for ac_i in 1 2 3 4 5 6 7; do
  11. ac_script="$ac_script$as_nl$ac_script"
  12. done
  13. echo "$ac_script" | sed 99q >conftest.sed
  14. $as_unset ac_script || ac_script=
  15. ifdef([_AC_PATH_PROGS_FEATURE_CHECK], [_AC_PATH_PROGS_FEATURE_CHECK], [_AC_PATH_PROG_FEATURE_CHECK])(SED, [sed gsed],
  16. [_AC_FEATURE_CHECK_LENGTH([ac_path_SED], [ac_cv_path_SED],
  17. ["$ac_path_SED" -f conftest.sed])])])
  18. SED="$ac_cv_path_SED"
  19. AC_SUBST([SED])dnl
  20. rm -f conftest.sed
  21. ])# AST_PROG_SED