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libtool: make fork minimisation compatible with dash and zsh.

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* build-aub/general.m4sh (lt_HAVE_PLUSEQ_OP): Instead of using
$((..)) arithmetic, which causes an error on dash, use a case
based bash version check.
(lt_HAVE_ARITH_OP, lt_HAVE_XSI_OPS): Also short circuit the
feature probing forks and set these automatically when zsh is
detected.
Reported by Stefano Lattarini.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
This commit is contained in:
Gary V. Vaughan 2011-12-18 20:41:10 +07:00
parent 78385ffd8a
commit c03789b8ee
1 changed files with 7 additions and 5 deletions
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12
build-aux/general.m4sh
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@ -75,14 +75,16 @@ basename='s|^.*/||'
# We should try to minimise forks, especially on Windows where they are
# unreasonably slow, so skip the feature probes when bash is being used:
if test set = "${BASH_VERSION+set}"; then
# unreasonably slow, so skip the feature probes when bash or zsh are
# being used:
if test set = "${BASH_VERSION+set}${ZSH_VERSION}"; then
: ${lt_HAVE_ARITH_OP="yes"}
: ${lt_HAVE_XSI_OPS="yes"}
# The += operator was introduced in bash 3.1
test -z "$lt_HAVE_PLUSEQ_OP" \
&& test 3000 -lt "$((${BASH_VERSINFO[0]}*1000 + ${BASH_VERSINFO[1]}))" \
&& lt_HAVE_PLUSEQ_OP=yes
case $BASH_VERSION in
[12].* | 3.0 | 3.0.*) ;;
*) lt_HAVE_PLUSEQ_OP=yes ;;
esac
fi