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* m4/libtool.m4: Speed up max_cmd_len check.

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Peter O'Gorman 2003-10-11 16:51:46 +00:00
parent 438422eaf8
commit 884ec923bd
3 changed files with 14 additions and 4 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2003-10-12 Peter O'Gorman <peter@pogma.com>
* m4/libtool.m4: Speed up max_cmd_len check.
2003-10-08 Gary V. Vaughan <gary@gnu.org>
* libtoolize.in: AC_CONFIG_M4_DIR has landed in CVS autoconf.

1
NEWS
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@ -14,6 +14,7 @@ New in 1.5b: 2003-??-??; CVS version 1.5a, Libtool team:
* Mode inferrence removed, shorthand for choosing modes added.
* Specifying -allow-undefined is now an error.
* Initial support for amigaos-ppc.
* Speed up max_cmd_len check.
* Bug fixes.
New in 1.5.1: 2003-??-??; CVS version 1.5.0a, Libtool team:

13
m4/libtool.m4 vendored
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@ -677,18 +677,23 @@ AC_CACHE_VAL([lt_cv_sys_max_cmd_len], [dnl
;;
*)
# Make testring 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
testring=$testring$testring
done
# 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"`$CONFIG_SHELL [$]0 --fallback-echo "X$testring" 2>/dev/null` \
= "XX$testring") >/dev/null 2>&1 &&
new_result=`expr "X$testring" : ".*" 2>&1` &&
lt_cv_sys_max_cmd_len=$new_result &&
while (test "X"`$CONFIG_SHELL [$]0 --fallback-echo "X$testring$testring" 2>/dev/null` \
= "XX$testring$testring") >/dev/null 2>&1 &&
test $i != 17 # 1/2 MB should be enough
do
i=`expr $i + 1`
testring=$testring$testring
done
# Only check the string length outside the loop.
lt_cv_sys_max_cmd_len=`expr "X$testring" : ".*" 2>&1`
testring=
# Add a significant safety factor because C++ compilers can tack on massive
# amounts of additional arguments before passing them to the linker.