Public bug reported:
The code I try to compile and link:
$ cat s.c
#include <stdio.h>
#include <math.h>
int main()
{
double n = 5.0;
printf("%f\n", sqrt(n));
}
Linking fails with gcc, gcc-7, gcc-8, gcc-9:
$ gcc -lm s.c
/usr/bin/ld: /tmp/ccBhhS0F.o: in function `main':
s.c:(.text+0x23): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
Linking succeeds with g++, clang:
$ g++ -lm s.c
$ clang -lm s.c
Tested with Ubuntu 18.04 and 19.10.
On Debian linking with gcc works fine.
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gcc 4:9.2.1-3.1ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Nov 5 08:46:14 2019
ProcEnviron:
LANGUAGE=de_DE:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: gcc-defaults
UpgradeStatus: Upgraded to eoan on 2019-10-29 (6 days ago)
** Affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug eoan
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https://bugs.launchpad.net/bugs/1851341
Title:
gcc linking fails: undefined reference to sqrt
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