Edit report at https://bugs.php.net/bug.php?id=69896&edit=1
ID: 69896
Updated by: ab@php.net
Reported by: fh-phpbugs at fholzhauer dot de
Summary: zend_operators.h:685:2: error: 'asm' operand has
impossible constraints
Status: Closed
Type: Bug
Package: Compile Failure
Operating System: Ubuntu Linux - Trusty 14.04.1
PHP Version: 7.0.0beta2
Assigned To: ab
Block user comment: N
Private report: N
New Comment:
@clicky, hm, I don't reproduce it, fetched a fresh stretch iso just now. Tried with your
description in #69765 as well. Another way to keep asm for 4.8 could be maybe removing
--with-layout=GNU, as I've observed. But either way, no issue with gcc 4.9 for me.
Ondrej, can you check as well please?
Thanks.
Previous Comments:
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[2015-08-02 11:02:37] clicky at erebot dot net
The build is still broken for me on Debian Stretch 64 bits (gcc version 4.9.2 (Debian 4.9.2-10)).
Using the attached patch did not fix the issue (obviously, since the patch is specifically targetted
towards GCC 4.8.x).
It only triggers when building a 32 bits version of PHP.
------------------------------------------------------------------------
[2015-08-02 07:50:18] ab@php.net
Thanks for the checks, Remi. So the part is broken at least in two distros. Probably fair enough to
disable for all i386 gcc-4.8 as no guarantee what happens elsewhere.
Thanks.
------------------------------------------------------------------------
[2015-08-02 07:31:37] ab@php.net
Automatic comment on behalf of ab
Revision: http://git.php.net/?p=php-src.git;a=commit;h=ee2e1691080dad2a3110107dd8bd02ee23b41fa0
Log: Fixed bug #69896 'asm' operand has impossible constraints
------------------------------------------------------------------------
[2015-08-02 06:11:10] remi@php.net
I didn't encounter this issue, mostly because I don't have any gcc 4.8 / 32bits target ;)
Fedora use gcc 4.9 or 5.1
RHEL 6 use gcc 4.4
RHEL 7 use gcc 4.8 but is 64bits only.
So I run some test builds
Fedora 18 (gcc 4.7.2): build ok
Fedora 20 (gcc 4.8.3): same error, fixed by the proposed patch
------------------------------------------------------------------------
[2015-08-01 16:01:59] ab@php.net
Ondrej,
this appears to be bug in gcc 4.8. A lot of bugs about constraints are around for this version. Libs
like ffmpeg, etc. recommend disabling asm. If you can switch to gcc 4.9 or gcc 4.7 - it would likely
solve this.
Nevertheless I've attached a patch disabling this part for gcc 4.8. However not sure it's
the correct solution. I've tested at least on OpenSUSE and gcc 4.8 works fine there (however
not directly on i386 but with -m32). This might be a Debian only issue, in which case it should
probably reported to the corresponding gcc package maintainers.
For now, could you please confirm that using either gcc 4.7 or 4.9 solves this? The patch should
solve it anyway.
Thanks.
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