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build: fix configure compatiblity with POSIX shells

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The kernel version detection code uses some bashisms, which makes the
build fail on Debian systems where /bin/sh links to dash. Replace with
POSIX-conforming commands at the cost of requiring awk.
This commit is contained in:
Matthias Schiffer
2016-04-03 14:01:01 +02:00
committed by Jan Engelhardt
parent 5038e160f8
commit e6f20befad
1 changed files with 9 additions and 15 deletions
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24
configure.ac
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@@ -44,21 +44,15 @@ regular_CFLAGS="-Wall -Waggregate-return -Wmissing-declarations \
if test -n "$kbuilddir"; then if test -n "$kbuilddir"; then
AC_MSG_CHECKING([kernel version that we will build against]) AC_MSG_CHECKING([kernel version that we will build against])
krel="$(make -sC "$kbuilddir" M=$PWD kernelrelease)"; krel="$(make -sC "$kbuilddir" M=$PWD kernelrelease | $AWK -v 'FS=[[^0-9.]]' '{print $1; exit}')"
kmajor="${krel%%[[^0-9]]*}"; save_IFS="$IFS"
kmajor="$(($kmajor+0))"; IFS='.'
krel="${krel:${#kmajor}}"; set x $krel
krel="${krel#.}"; IFS="$save_IFS"
kminor="${krel%%[[^0-9]]*}"; kmajor="$(($2+0))"
kminor="$(($kminor+0))"; kminor="$(($3+0))"
krel="${krel:${#kminor}}"; kmicro="$(($4+0))"
krel="${krel#.}"; kstable="$(($5+0))"
kmicro="${krel%%[[^0-9]]*}";
kmicro="$(($kmicro+0))";
krel="${krel:${#kmicro}}";
krel="${krel#.}";
kstable="${krel%%[[^0-9]]*}";
kstable="$(($kstable+0))";
if test -z "$kmajor" -o -z "$kminor" -o -z "$kmicro"; then if test -z "$kmajor" -o -z "$kminor" -o -z "$kmicro"; then
echo "WARNING: Version detection did not succeed. Continue at own luck."; echo "WARNING: Version detection did not succeed. Continue at own luck.";
else else