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From: | Stefano Lattarini |
Subject: | Re: FYI [PATCH] libtool: minimise forks per invocation under bash. |
Date: | Sun, 18 Dec 2011 10:52:30 +0100 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.24) Gecko/20111114 Icedove/3.1.16 |
On 12/18/2011 06:15 AM, Gary V. Vaughan wrote:
+# 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 + : ${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 +fi
This will likely break with dash 0.5.2: $ cat foo.sh #!/bin/sh if test set = "${BASH_VERSION+set}"; 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 fi $ dash foo.sh foo.sh: 7: Syntax error: Bad substitution Regards, Stefano
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