https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109389
Bug ID: 109389
Summary: g++ file.cpp -lgmp (option only works after filename)
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: frechbengel at gmx dot de
Target Milestone: ---
Hello,
1. »g++ --version« outputs:
g++ (Debian 10.2.1-6) 10.2.1 20210110
2. »g++ --help« says:
Usage: g++ [options] file...
3. But if I try to compile:
#include <gmp.h>
int main(){
mpz_t n;
mpz_init(n);
mpz_clear(n);
return 0;}
4. with »g++ -lgmp file.cpp« the error is:
/usr/bin/ld: /tmp/cc8lgHAc.o: in function `main':
guard_driver.cpp:(.text+0x10): undefined reference to `__gmpz_init'
/usr/bin/ld: guard_driver.cpp:(.text+0x21): undefined reference to
`__gmpz_set_ui'
/usr/bin/ld: guard_driver.cpp:(.text+0x34): undefined reference to
`operator<<(std::ostream&, __mpz_struct const*)'
/usr/bin/ld: guard_driver.cpp:(.text+0x55): undefined reference to
`__gmpz_clear'
collect2: error: ld returned 1 exit status
5. There is no error if I compile with:
»g++ file.cpp -lgmp«
6. As the --help says the options should be given BEFORE the filename it is a
feature if it works with options given after the filename, too. But I is
propably a bug that compilation only works with the option given after the
filename.
Regards and thank you for you valuable work
Bernd
