Edit report at https://bugs.php.net/bug.php?id=76825&edit=1
ID: 76825
Updated by: cmb@php.net
Reported by: php-bugs-2018 at ryandesign dot com
Summary: Undefined symbols ___cpuid_count
-Status: Assigned
+Status: Closed
Type: Bug
Package: Compile Failure
Operating System: Mac OS X 10.7.5
PHP Version: 7.3.0beta3
Assigned To: cmb
Block user comment: N
Private report: N
New Comment:
Automatic comment on behalf of cmbecker69@gmx.de
Revision: http://git.php.net/?p=php-src.git;a=commit;h=7625f972db10fe1a69757b97c6dec57ea049129b
Log: Fix #76825: Undefined symbols ___cpuid_count
Previous Comments:
------------------------------------------------------------------------
[2018-10-26 15:58:27] php-bugs-2018 at ryandesign dot com
Yes, it works with AC_LINK_IFELSE. Thanks!
------------------------------------------------------------------------
[2018-10-26 14:46:28] cmb@php.net
> It looks like the problem is that the compiler is being invoked
> using the "-c" flag, which skips the link phase which is where
> the error occurs.
Then we'll have to replace the AC_COMPILE_IFELSE with
AC_LINK_IFELSE. Can you please try that?
------------------------------------------------------------------------
[2018-10-26 14:36:13] php-bugs-2018 at ryandesign dot com
Sorry for the delay. The configure test says __cpuid_count
is available, though it's obviously not. Here's what
config.log says about it:
configure:5874: checking whether __cpuid_count is available
configure:5896: /usr/bin/clang -c -pipe -Os -arch x86_64 -fvisibility=hidden -I/opt/local/include
-no-cpp-precomp conftest.c >&5
conftest.c:34:3: warning: implicit declaration of function '__cpuid_count' is invalid in
C99 [-Wimplicit-function-declaration]
__cpuid_count(0, 0, eax, ebx, ecx, edx);
^
1 warning generated.
configure:5896: $? = 0
configure:5907: result: yes
It looks like the problem is that the compiler is being
invoked using the "-c" flag, which skips the link phase
which is where the error occurs. I can reproduce this
with a small test program:
$ clang -c test.c; echo $?
test.c:5:1: warning: implicit declaration of function '__cpuid_count' is invalid in C99
[-Wimplicit-function-declaration]
__cpuid_count(0, 0, eax, ebx, ecx, edx);
^
1 warning generated.
0
$ clang test.c; echo $?
test.c:5:1: warning: implicit declaration of function '__cpuid_count' is invalid in C99
[-Wimplicit-function-declaration]
__cpuid_count(0, 0, eax, ebx, ecx, edx);
^
1 warning generated.
Undefined symbols for architecture x86_64:
"___cpuid_count", referenced from:
_main in test-eIiJ3P.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
1
------------------------------------------------------------------------
[2018-10-17 12:00:00] cmb@php.net
Please check the attached check-cpuid-count patch.
------------------------------------------------------------------------
[2018-10-17 11:59:56] cmb@php.net
The following patch has been added/updated:
Patch Name: check-cpuid-count
Revision: 1539777596
URL: https://bugs.php.net/patch-display.php?bug=76825&patch=check-cpuid-count&revision=1539777596
------------------------------------------------------------------------
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