Am 24.11.2013 17:48, schrieb Michael S. Tsirkin: > On Sun, Nov 24, 2013 at 05:39:58PM +0200, Michael S. Tsirkin wrote: >> On Sun, Nov 24, 2013 at 02:54:51PM +0100, Stefan Weil wrote: >>> Am 24.11.2013 14:42, schrieb Michael S. Tsirkin: >>>> On Sun, Nov 24, 2013 at 03:04:04PM +0200, Marcel Apfelbaum wrote: >>>>> On Sun, 2013-11-24 at 11:52 +0200, Michael S. Tsirkin wrote: >>>>>> Useful for platforms with a broken IASL. >>>>>> >>>>>> Signed-off-by: Michael S. Tsirkin <m...@redhat.com> >>>>>> --- >>>>>> configure | 3 ++- >>>>>> 1 file changed, 2 insertions(+), 1 deletion(-) >>>>>> >>>>>> diff --git a/configure b/configure >>>>>> index 0592ba7..d0a0abe 100755 >>>>>> --- a/configure >>>>>> +++ b/configure >>>>>> @@ -1080,6 +1080,7 @@ echo " --source-path=PATH path of source >>>>>> code [$source_path]" >>>>>> echo " --cross-prefix=PREFIX use PREFIX for compile tools >>>>>> [$cross_prefix]" >>>>>> echo " --cc=CC use C compiler CC [$cc]" >>>>>> echo " --iasl=IASL use ACPI compiler IASL [$iasl]" >>>>>> +echo " iasl='' (empty string) disables ACPI >>>>>> compiler" >>>>>> echo " --host-cc=CC use C compiler CC [$host_cc] for code >>>>>> run at" >>>>>> echo " build time" >>>>>> echo " --cxx=CXX use C++ compiler CXX [$cxx]" >>>>>> @@ -4269,7 +4270,7 @@ else >>>>>> fi >>>>>> echo "PYTHON=$python" >> $config_host_mak >>>>>> echo "CC=$cc" >> $config_host_mak >>>>>> -if $iasl -h > /dev/null 2>&1; then >>>>>> +if test "$iasl" && $iasl -h > /dev/null 2>&1; then >>>>>> echo "IASL=$iasl" >> $config_host_mak >>>>>> fi >>>>>> echo "CC_I386=$cc_i386" >> $config_host_mak >>>>> I tried to disable iasl without this patch and it worked for me... >>>>> I used: >>>>> - [Qemu-devel] [PATCH] configure: make --iasl option actually work >>>>> - ./configure --iasl="" (or --iasl=) >>>>> and it worked (no sign of IASL in config-host.mak) >>>>> >>>>> I think this is because the prev test "$iasl -h > /dev/null 2>&1" >>>>> fails of course. >>>> By luck, yes. >>>> >>>> So this is just a documentation patch: cleaner to document the >>>> interface explicitly. >>>> I'll make this clearer in the commit log. >>>> >>> --iasl=false works without further modifications (because test "false >>> -h" works and returns false). It also looks more natural than --iasl=. >>> >>> Cheers, Stefan >> It seems that some people try --iasl= as the more natural way >> to do this. It's not documented that a failing iasl will >> cause a fall-back and I'd rather document an explicit option >> than making it fail. > I'm also curious why would you say =false is natural: > it's a string option not a boolean one. >
'false' is a string here, namely the name of the executable which is normally found at /bin/false. It takes any number of parameters and always returns 1 (which is boolean false in shell conventions). You could also write --iasl=/bin/false. I suggest this kind of patch: echo " --iasl=IASL use ACPI compiler IASL [$iasl]" +echo " iasl=false disables the ACPI compiler" echo " --host-cc=CC use C compiler CC [$host_cc] for code run at" Stefan