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commit 4099c121a131784d3ab103bee848e971d8bfafcb
Author: Gary V. Vaughan <g...@gnu.org>
Date: Thu Dec 8 17:01:56 2011 +0700
libtool: minimise forks per invocation under bash.
* build-aux/general.m4sh (lt_HAVE_PLUSEQ_OP, lt_HAVE_ARITH_OP)
(lt_HAVE_XSI_OPS): Set these without forking a test script when
running under bash, to avoid a few unnecessary forks.
Signed-off-by: Gary V. Vaughan <g...@gnu.org>
-----------------------------------------------------------------------
Summary of changes:
build-aux/general.m4sh | 21 ++++++++++++---------
1 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/build-aux/general.m4sh b/build-aux/general.m4sh
index 252b2d2..e96c0e4 100644
--- a/build-aux/general.m4sh
+++ b/build-aux/general.m4sh
@@ -74,12 +74,21 @@ dirname='s|/[^/]*$||'
basename='s|^.*/||'
+# We should try to minimise forks, especially on Windows where they are
+# unreasonably slow, so skip the feature probes when bash is being used:
+if test set = "${BASH_VERSION+set}"; then
+ : ${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 + ${BASH_VERSINFO[1]}))" \
+ && lt_HAVE_PLUSEQ_OP=yes
+fi
+
+
# lt_HAVE_PLUSEQ_OP
# Can be empty, in which case the shell is probed, "yes" if += is useable
# or anything else if += does not work.
-# NOTE: You can short-circuit the fork and test on every invocation (e.g.
-# on Windows where fork emulations are unreasonably slow) by setting this
-# in the environment of this script.
test -z "$lt_HAVE_PLUSEQ_OP" \
&& (eval 'x=a; x+=" b"; test "a b" = "$x"') 2>/dev/null \
&& lt_HAVE_PLUSEQ_OP=yes
@@ -117,9 +126,6 @@ fi
# lt_HAVE_ARITH_OP
# Can be empty, in which case the shell is probed, "yes" if $((...)) is
# useable or anything else if it does not work.
-# NOTE: You can short-circuit the fork and test on every invocation (e.g.
-# on Windows where fork emulations are unreasonably slow) by setting this
-# in the environment of this script.
test -z "$lt_HAVE_ARITH_OP" \
&& (eval 'test 2 = $(( 1 + 1 ))') 2>/dev/null \
&& lt_HAVE_ARITH_OP=yes
@@ -141,9 +147,6 @@ fi
# lt_HAVE_XSI_OPS
# Can be empty, in which case the shell is probed, "yes" if XSI length
# and matching operators are useable or anything else if they do not work.
-# NOTE: You can short-circuit the fork and test on every invocation (e.g.
-# on Windows where fork emulations are unreasonably slow) by setting this
-# in the environment of this script.
test -z "$lt_HAVE_XSI_OPS" \
&& (eval 'x=a/b/c;
test 5aa/bb/cc = "${#x}${x%%/*}${x%/*}${x#*/}${x##*/}"') 2>/dev/null \
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