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configure: Support empty target list (--target-list=)

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Specifying an empty target list with --target-list= is shorter
than specifying --disable-user --disable-system.

Both variants should give the same result: no targets at all.

This modification implements that feature.

It uses a trick which works with POSIX compliant shells to test whether
target_list is undefined (=> default targets) or empty (=> no targets).

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
This commit is contained in:
Stefan Weil 2012-09-26 22:04:38 +02:00 committed by Stefan Hajnoczi
parent 7a608f562e
commit afb63ebd0a
1 changed files with 3 additions and 2 deletions
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5
configure vendored
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@ -125,7 +125,8 @@ cc_i386=i386-pc-linux-gnu-gcc
libs_qga=""
debug_info="yes"
target_list=""
# Don't accept a target_list environment variable.
unset target_list
# Default value for a variable defining feature "foo".
# * foo="no" feature will only be used if --enable-foo arg is given
@ -1288,7 +1289,7 @@ if ! "$python" -c 'import sys; sys.exit(sys.version_info < (2,4) or sys.version_
exit 1
fi
if test -z "$target_list" ; then
if test -z "${target_list+xxx}" ; then
target_list="$default_target_list"
else
target_list=`echo "$target_list" | sed -e 's/,/ /g'`