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libtool.m4 (LT_CMD_MAX_LEN): Try using getconf to set lt_cv_sys_max_cmd_len.

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2007-06-01  Steve Ellcey  <sje@cup.hp.com>

	* libltdl/m4/libtool.m4 (LT_CMD_MAX_LEN): Try using getconf
	to set lt_cv_sys_max_cmd_len.

From-SVN: r125262
This commit is contained in:
Steve Ellcey 2007-06-01 11:32:07 +00:00 committed by Paolo Bonzini
parent b8637750d3
commit 973a9a5ee1
2 changed files with 34 additions and 23 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2007-06-01 Steve Ellcey <sje@cup.hp.com>
* libltdl/m4/libtool.m4 (LT_CMD_MAX_LEN): Try using getconf
to set lt_cv_sys_max_cmd_len.
2007-05-31 Dorit Nuzman <dorit@il.ibm.com>
* MAINTAINERS (Various Maintainers): Add myself as

52
libtool.m4 vendored
View File

@ -1439,29 +1439,35 @@ AC_CACHE_VAL([lt_cv_sys_max_cmd_len], [dnl
fi
;;
*)
# Make teststring a little bigger before we do anything with it.
# a 1K string should be a reasonable start.
for i in 1 2 3 4 5 6 7 8 ; do
teststring=$teststring$teststring
done
SHELL=${SHELL-${CONFIG_SHELL-/bin/sh}}
# If test is not a shell built-in, we'll probably end up computing a
# maximum length that is only half of the actual maximum length, but
# we can't tell.
while { test "X"`$SHELL [$]0 --fallback-echo "X$teststring$teststring" 2>/dev/null` \
= "XX$teststring$teststring"; } >/dev/null 2>&1 &&
test $i != 17 # 1/2 MB should be enough
do
i=`expr $i + 1`
teststring=$teststring$teststring
done
# Only check the string length outside the loop.
lt_cv_sys_max_cmd_len=`expr "X$teststring" : ".*" 2>&1`
teststring=
# Add a significant safety factor because C++ compilers can tack on massive
# amounts of additional arguments before passing them to the linker.
# It appears as though 1/2 is a usable value.
lt_cv_sys_max_cmd_len=`expr $lt_cv_sys_max_cmd_len \/ 2`
lt_cv_sys_max_cmd_len=`getconf ARG_MAX 2> /dev/null`
if test -n $lt_cv_sys_max_cmd_len; then
lt_cv_sys_max_cmd_len=`expr $lt_cv_sys_max_cmd_len \/ 4`
lt_cv_sys_max_cmd_len=`expr $lt_cv_sys_max_cmd_len \* 3`
else
# Make teststring a little bigger before we do anything with it.
# a 1K string should be a reasonable start.
for i in 1 2 3 4 5 6 7 8 ; do
teststring=$teststring$teststring
done
SHELL=${SHELL-${CONFIG_SHELL-/bin/sh}}
# If test is not a shell built-in, we'll probably end up computing a
# maximum length that is only half of the actual maximum length, but
# we can't tell.
while { test "X"`$SHELL [$]0 --fallback-echo "X$teststring$teststring" 2>/dev/null` \
= "XX$teststring$teststring"; } >/dev/null 2>&1 &&
test $i != 17 # 1/2 MB should be enough
do
i=`expr $i + 1`
teststring=$teststring$teststring
done
# Only check the string length outside the loop.
lt_cv_sys_max_cmd_len=`expr "X$teststring" : ".*" 2>&1`
teststring=
# Add a significant safety factor because C++ compilers can tack on
# massive amounts of additional arguments before passing them to the
# linker. It appears as though 1/2 is a usable value.
lt_cv_sys_max_cmd_len=`expr $lt_cv_sys_max_cmd_len \/ 2`
fi
;;
esac
])