[systemd-devel] [systemd-commits] configure.ac
David Herrmann
dh.herrmann at gmail.com
Tue Feb 24 07:08:17 PST 2015
Hi
On Tue, Feb 24, 2015 at 4:07 PM, Zbigniew Jędrzejewski-Szmek
<zbyszek at in.waw.pl> wrote:
> On Tue, Feb 24, 2015 at 07:02:49AM -0800, David Herrmann wrote:
>> configure.ac | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> New commits:
>> commit 0a98d66159e474915afd6597d3aa444a698fdd2d
>> Author: David Herrmann <dh.herrmann at gmail.com>
>> Date: Tue Feb 24 15:59:06 2015 +0100
>>
>> build: add -Wno-format-signedness
>>
>> gcc5 introduced this option (gcc4 silently ignores it, which is fine).
>> Given that gcc5 thinks 'unsigned char'/'unsigned short' is promoted to
>> 'int' for var-args, stuff like this spits out warnings:
>> uint8_t x;
>> printf("%" PRIu8", x);
>>
>> gcc5 promots 'x' to 'int', instead of 'unsigned int' and thus gets a
>> signedness-warnings as it expects an 'unsigned int'.
>>
>> glibc states otherwise: unsigneds are always promoted to 'unsigned int'.
>> Until gcc and glibc figure this out, lets just ignore that warning (which
>> is totally useless in its current form).
>>
>> diff --git a/configure.ac b/configure.ac
>> index 9a2235b..22a6f17 100644
>> --- a/configure.ac
>> +++ b/configure.ac
>> @@ -186,6 +186,7 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
>> -Wno-unused-parameter \
>> -Wno-missing-field-initializers \
>> -Wno-unused-result \
>> + -Wno-format-signedness \
> This doesn't really work, as discussed previously on the list.
Why? Works fine with gcc4 and gcc5 here. What's the problem exactly?
Thanks
David
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