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(_AC_COMPUTE_INT_COMPILE): Do not pass a first argument with leading '-'

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to expr, by parenthesizing initial integers that might be negative.
This commit is contained in:
Paul Eggert 2001-09-18 17:55:51 +00:00
parent 69af46fdbd
commit 99ba592715
1 changed files with 2 additions and 2 deletions
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4
lib/autoconf/general.m4
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@ -2517,13 +2517,13 @@ AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) >= 0])],
while :; do
AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) >= $ac_mid])],
[ac_lo=$ac_mid; break],
[ac_hi=`expr $ac_mid - 1`; ac_mid=`expr 2 '*' $ac_mid`])
[ac_hi=`expr '(' $ac_mid ')' - 1`; ac_mid=`expr 2 '*' $ac_mid`])
done])
# Binary search between lo and hi bounds.
while test "x$ac_lo" != "x$ac_hi"; do
ac_mid=`expr '(' $ac_hi - $ac_lo ')' / 2 + $ac_lo`
AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) <= $ac_mid])],
[ac_hi=$ac_mid], [ac_lo=`expr $ac_mid + 1`])
[ac_hi=$ac_mid], [ac_lo=`expr '(' $ac_mid ')' + 1`])
done
$2=$ac_lo[]dnl
])# _AC_COMPUTE_INT_COMPILE