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Bug #77445 Link-Time-Optimizations fail
Submitted: 2019-01-11 11:03 UTC Modified: 2019-01-11 11:05 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: dpa-bugs at aegee dot org Assigned:
Status: Open Package: *General Issues
PHP Version: 7.1.26 OS: Linux
Private report: No CVE-ID: None
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 [2019-01-11 11:03 UTC] dpa-bugs at aegee dot org
Description:
------------
With gcc 8.2.1 -flto build fails:

/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.1/../../../../x86_64-pc-linux-gnu/bin/ld: /src/mail/imap-2007f//lib/libc-client.a(osdep.o): in function `ssl_onceonlyinit':
/src/mail/imap-2007f/c-client/osdep.c:302: warning: the use of `tmpnam' is dangerous, better use `mkstemp'
/src/http/php-7.1.26/Zend/zend_vm_execute.h: In function 'ZEND_IS_SMALLER_OR_EQUAL_DOUBLE_SPEC_TMPVARCV_TMPVARCV_HANDLER':
/src/http/php-7.1.26/Zend/zend_vm_execute.h:326:38: error: global register variable follows a function definition
 register zend_execute_data* volatile execute_data __asm__(ZEND_VM_FP_GLOBAL_REG);
                                      ^
/src/http/php-7.1.26/Zend/zend_vm_execute.h:332:34: error: global register variable follows a function definition
 register const zend_op* volatile opline __asm__(ZEND_VM_IP_GLOBAL_REG);
                                  ^
/src/http/php-7.1.26/ext/readline/readline_cli.c: In function 'cli_completion_generator_ht.constprop':
/src/http/php-7.1.26/ext/readline/readline_cli.c:408:15: warning: 'name' may be used uninitialized in this function [-Wmaybe-uninitialized]
  zend_string *name;
               ^
/src/http/php-7.1.26/sapi/cli/php_cli_server.c: In function 'php_cli_server_client_read_request_on_path':
/src/http/php-7.1.26/sapi/cli/php_cli_server.c:1571:29: warning: 'vpath_len' may be used uninitialized in this function [-Wmaybe-uninitialized]
   client->request.vpath_len = vpath_len;
                             ^
/src/http/php-7.1.26/sapi/cli/php_cli_server.c:1568:10: note: 'vpath_len' was declared here
   size_t vpath_len;
          ^
/src/http/php-7.1.26/Zend/zend_execute.c: In function 'zend_check_arg_type':
/src/http/php-7.1.26/Zend/zend_execute.c:959:3: warning: 'ce' may be used uninitialized in this function [-Wmaybe-uninitialized]
   zend_verify_arg_error(zf, cur_arg_info, arg_num, ce, arg);
   ^
/src/http/php-7.1.26/Zend/zend_execute.c:948:20: note: 'ce' was declared here
  zend_class_entry *ce;
                    ^
lto-wrapper: fatal error: cc returned 1 exit status
compilation terminated.
/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.1/../../../../x86_64-pc-linux-gnu/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make: *** [Makefile:300: sapi/cli/php] Error 1


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 [2019-01-11 11:05 UTC] nikic@php.net
You need to build with --disable-gcc-global-regs.
 [2019-01-11 11:08 UTC] spam2 at rhsoft dot net
it's a long known problem that you can't use LTO until you use --disable-gcc-global-regs which is really sad because the best performance would be --enable-gcc-global-regs + LTO + PGO
 [2019-01-11 23:49 UTC] a at b dot c dot de
See also bug #77318
 
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