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[Bug math/21264] New: Selective static linking of libm.a fails due to unresolved _dl_x86_cpu_features symbol
- From: "fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 17 Mar 2017 14:31:06 +0000
- Subject: [Bug math/21264] New: Selective static linking of libm.a fails due to unresolved _dl_x86_cpu_features symbol
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=21264
Bug ID: 21264
Summary: Selective static linking of libm.a fails due to
unresolved _dl_x86_cpu_features symbol
Product: glibc
Version: 2.25
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
Target Milestone: ---
Target: x86_64
Example from the downstream bug report:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main(int argc, char **argv)
{
printf("string:%s\n",argv[1]);
float input=strtof(argv[1],NULL);
printf("input:%f\n",input);
float result;
result = sin(input);
printf("%f\n",result);
return 0;
}
GCC command line (note that libm is linked statically, but libc is linked
dynamically):
gcc test.c -Wl,-Bstatic -lm -Wl,-Bdynamic -lc
Actual results:
Linker error message:
/usr/lib64/libm-2.25.90.a(s_sin.o): In function `__cos_ifunc':
(.text+0x4d22): undefined reference to `_dl_x86_cpu_features'
/usr/lib64/libm-2.25.90.a(s_sin.o): In function `__sin_ifunc':
(.text+0x4d52): undefined reference to `_dl_x86_cpu_features'
I'm not sure if it is reasonable for our users to expect this to work, but so
far we did not actively prevent that from happening.
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