| 1 | #serial 5
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| 2 |
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| 3 | # AC_PROG_SHELL
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| 4 | # -------------
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| 5 | # Check for a working (i.e. POSIX-compatible) shell.
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| 6 | # Written by Paul Eggert <eggert@twinsun.com>,
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| 7 | # from an idea suggested by Albert Chin-A-Young <china@thewrittenword.com>.
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| 8 | AC_DEFUN([AC_PROG_SHELL],
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| 9 | [AC_MSG_CHECKING([for a POSIX-compliant shell])
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| 10 | AC_CACHE_VAL(ac_cv_path_shell,
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| 11 | [ac_command='
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| 12 | # Test the noclobber option, using the portable POSIX.2 syntax.
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| 13 | set -C
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| 14 | rm -f conftest.c
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| 15 | >conftest.c || exit
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| 16 | >|conftest.c || exit
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| 17 | !>conftest.c || exit
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| 18 | # Test that $(...) works.
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| 19 | test "$(expr 3 + 4)" -eq 7 || exit
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| 20 | '
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| 21 | ac_cv_path_shell=no
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| 22 |
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| 23 | case $SHELL in
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| 24 | /*)
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| 25 | rm -f conftest.c
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| 26 | if ("$SHELL" -c "$ac_command") 2>/dev/null; then
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| 27 | ac_cv_path_shell=$SHELL
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| 28 | fi;;
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| 29 | esac
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| 30 |
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| 31 | case $ac_cv_path_shell in
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| 32 | no)
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| 33 | # Prefer shells that are more likely to be installed in the
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| 34 | # same place on all hosts of this platform. Therefore, prefer
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| 35 | # shells in /bin and /usr/bin to shells in the installer's
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| 36 | # PATH. Also, loop through PATH first and then through
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| 37 | # shells, since less-"nice" shells in /bin and /usr/bin are
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| 38 | # more likely to be installed than "nicer" shells elsewhere.
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| 39 | as_save_IFS=$IFS; IFS=:
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| 40 | for as_dir in /bin /usr/bin $PATH
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| 41 | do
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| 42 | IFS=$as_save_IFS
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| 43 | case $as_dir in
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| 44 | /*)
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| 45 | for ac_base in sh bash ksh sh5; do
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| 46 | rm -f conftest.c
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| 47 | if ("$as_dir/$ac_base" -c "$ac_command") 2>/dev/null; then
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| 48 | ac_cv_path_shell=$as_dir/$ac_base
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| 49 | break
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| 50 | fi
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| 51 | done
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| 52 | case $ac_cv_path_shell in
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| 53 | /*) break;;
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| 54 | esac;;
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| 55 | esac
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| 56 | done
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| 57 | rm -f conftest.c;;
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| 58 | esac])
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| 59 | AC_MSG_RESULT($ac_cv_path_shell)
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| 60 | SHELL=$ac_cv_path_shell
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| 61 | if test "$SHELL" = no; then
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| 62 | SHELL=/bin/sh
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| 63 | AC_MSG_WARN([using $SHELL, even though it does not conform to POSIX])
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| 64 | fi
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| 65 | AC_SUBST(SHELL)])
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