Repository navigation
FTBFS php 8.5.6 with GCC 16 #22206
Description
Description
Hi,
when building php 8.5.6 with GCC 16, I get the following error:
[ 220s] In file included from /home/abuild/rpmbuild/BUILD/php8-8.5.6-build/php-8.5.6/ext/opcache/jit/zend_jit.c:43:
[ 220s] /home/abuild/rpmbuild/BUILD/php8-8.5.6-build/php-8.5.6/ext/opcache/jit/zend_jit.c: In function ‘zend_runtime_jit’:
[ 220s] ext/opcache/jit/zend_jit_internal.h:215:70: error: cannot tail-call: caller uses setjmp
[ 220s] 215 | # define ZEND_OPCODE_RETURN() ZEND_OPCODE_TAIL_CALL((zend_vm_opcode_handler_t)opline->handler)
[ 220s] | ^
[ 220s] ext/opcache/jit/zend_jit_internal.h:213:39: note: in definition of macro ‘ZEND_OPCODE_TAIL_CALL’
[ 220s] 213 | ZEND_MUSTTAIL return (handler)(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU); \
[ 220s] | ^~~~~~~
[ 220s] /home/abuild/rpmbuild/BUILD/php8-8.5.6-build/php-8.5.6/ext/opcache/jit/zend_jit.c:3140:9: note: in expansion of macro ‘ZEND_OPCODE_RETURN’
[ 220s] 3140 | ZEND_OPCODE_RETURN();
[ 220s] | ^~~~~~~~~~~~~~~~~~
[ 220s] make: *** [Makefile:2301: ext/opcache/jit/zend_jit.lo] Error 1
[ 220s] make: *** Waiting for unfinished jobs....
I am aware of issue #21960, but the fix mentioned there doesn't work for me (the error above is with LTO disabled). Full build log attached.
PHP Version
PHP 8.5.6
Operating System
openSUSE Tumbleweed
Reacted by Andy Postnikov
Activity
P3p111n0 commentedon Jun 3, 2026
Building without
-Werror=return-typefixes the build for me. Not really sure why.Fix phpGH-22206: [opcache] avoid musttail in zend_runtime_jit() (GCC 16)
henderkes commentedon Jun 7, 2026
Does gcc support preserve_none musttails now? I'm confused why it would even take this path.
P3p111n0 commentedon Jun 8, 2026
Yes, preserve_none support was added in GCC 16.
zend: fix missing return in global register detection (phpGH-22206)
zend: fix missing return in global register detection (GH-22206) (#22320
Merge branch 'PHP-8.5'
petk commentedon Jun 17, 2026
The linked pull request that should fix this has been merged to PHP-8.4 and up. Thanks!
Merge branch 'PHP-8.4' into PHP-8.5
arjendekorte commentedon Jun 17, 2026
Even with the linked pull-request, the build still fails when
--disable-gcc-global-regsis used.arjendekorte commentedon Jun 18, 2026
Basically b0c7865 is a fix for the global register detection and is consistent with what is mentioned in #21960 so that the build is succesful with GCC 16 and
--enable-gcc-global-regs.And shamanzpua@39c6782 will fix the build with GCC 16 and
--disable-gcc-global-regs.P3p111n0 commentedon Jun 22, 2026
If there are no performance side effects, then removing the musttail is certainly the simplest way to fix this. I opened a bug in the GCC bugzilla: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125874. The analysis on GCC might get more refined to the point that the removal of the musttail is not needed, though it is unclear if/when that's going to happen.
Fix phpGH-22206: restrict the tail-call VM to Clang
Revert "Fix phpGH-22206: avoid musttail in zend_runtime_jit() in the …
Fix GH-22206: Enable the TAILCALL VM only on Clang (#23054)
Merge branch 'PHP-8.5'