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From: "frechbengel at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109389] New: g++ file.cpp -lgmp (option only works after
 filename)
Date: Mon, 03 Apr 2023 11:34:14 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 10.2.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109389

            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. =C2=BBg++ --version=C2=AB outputs:
g++ (Debian 10.2.1-6) 10.2.1 20210110


2. =C2=BBg++ --help=C2=AB 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 =C2=BBg++ -lgmp file.cpp=C2=AB 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:

=C2=BBg++ file.cpp -lgmp=C2=AB


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=