https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68384
Bug ID: 68384
Summary: LTO error for global register variables in PHP 7
compiling on powerpc64le
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: acsawdey at gcc dot gnu.org
Target Milestone: ---
Created attachment 36734
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36734&action=edit
zend.i from reduced test case
If you attempt to build PHP 7 with -flto, you encounter errors for the 2
register global variables it uses:
zend_execute.i:81:32: error: global register variable follows a function
definition
register const zend_op *opline __asm__("r29");
^
zend_execute.i:80:36: error: global register variable follows a function
definition
register zend_execute_data *execute_data __asm__("r28");
^
I've reduced this with multidelta and the preprocessed files are attached.
Reproduce with:
gcc -flto -O3 main.i php_cli.i zend_execute.i zend.i
Of course this test case won't link or do anything useful, but it hits the LTO
issue before getting to the link phase.
I did my testing with trunk 230270, but older gcc 4.8.x also has the same
problem.
