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Cause:
The fix for bug 1925204 resulted in a regression when building static programs that link against libm on i686 and x86_64.
Consequence:
Static builds using isnanl fail to link against libm with the error "multiple definition of `__isnanl'".
Fix:
The x86-specific code for function isnanl_pseudo was moved into its own file to avoid multiple definitions of the __isnanl during a static link.
Result:
Static builds linking against libm and using isnanl now succeed again.
Description of problem:
Since updating to glibc-static-2.17-323.el7_9.x86_64, programs using isnan()
on long double values no longer link successfully with -static, erroring out
with "multiple definition of `__isnanl'".
Version-Release number of selected component (if applicable):
glibc-static-2.17-323.el7_9.x86_64
How reproducible:
Always
Steps to Reproduce:
1. cat test.c
#include <math.h>
int main() {
long double x = 0.;
return isnan(x);
}
2. gcc -Wall -static test.c -lm
Actual results:
gcc fails with
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libc.a(s_isnanl.o): In function `__isnanl':
(.text+0x0): multiple definition of `__isnanl'
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libm.a(m_isnanl.o):(.text+0x0): first defined here
collect2: error: ld returned 1 exit status
Expected results:
gcc compiles and links successfully.
Additional info:
The same test works correctly with glibc-static-2.17-322.el7_9.x86_64.
The changelog for -323 lists only one change, which likely is the cause:
"Fix isnanl check in printf. (#1925204)"
Comment 2Siddhesh Poyarekar
2021-02-11 04:10:50 UTC
Thank you for reporting this. isnanl gets packaged into both libc.a and libm.a and because glibc-2.17-323 created differences between the two versions, the static link started failing.
We're working on a fix for this. Meanwhile an easy way to work around this would be to downgrade to glibc-2.17-317.
Alternatively, it may work in some cases to drop m_isnanl.o from libm.a and then linking against that modified archive. Please note though that this is a temporary workaround and not a supported long term solution.
$ cp /lib64/libm.a $YOUR_BUILD_DIRECTORY/libm.a
$ ar d $BUILD_DIRECTORY/libm.a m_isnanl.o
$ gcc -Wall -static test.c $BUILD_DIRECTORY/libm.a
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (glibc bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2021:1392
Description of problem: Since updating to glibc-static-2.17-323.el7_9.x86_64, programs using isnan() on long double values no longer link successfully with -static, erroring out with "multiple definition of `__isnanl'". Version-Release number of selected component (if applicable): glibc-static-2.17-323.el7_9.x86_64 How reproducible: Always Steps to Reproduce: 1. cat test.c #include <math.h> int main() { long double x = 0.; return isnan(x); } 2. gcc -Wall -static test.c -lm Actual results: gcc fails with /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libc.a(s_isnanl.o): In function `__isnanl': (.text+0x0): multiple definition of `__isnanl' /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libm.a(m_isnanl.o):(.text+0x0): first defined here collect2: error: ld returned 1 exit status Expected results: gcc compiles and links successfully. Additional info: The same test works correctly with glibc-static-2.17-322.el7_9.x86_64. The changelog for -323 lists only one change, which likely is the cause: "Fix isnanl check in printf. (#1925204)"