On Jul 30, 2025, at 14:52, Kenneth Wolcott wrote:
Hi;
What do I need to add or modify to my clang++ compile command?
I installed gmp via MacPorts:
port installed | grep gmp | grep -v p5 | grep -v R | grep -v py
gmp @6.3.0_0 (active)
FYI you can just use "port installed gmp".
When I try to compile a Rosetta Code task written in C++
(https://rosettacode.org/wiki/Find_largest_left_truncatable_prime_in_a_given_base#C++)
I get these error(s):
clang++ -std=c++20 -lgmp -o
./find_largest_left_truncatable_prime_in_a_given_base
./find_largest_left_truncatable_prime_in_a_given_base.cpp
Undefined symbols for architecture arm64:
"operator<<(std::__1::basic_ostream<char,
std::__1::char_traits<char>>&, __mpz_struct const*)", referenced from:
std::__1::basic_ostream<char, std::__1::char_traits<char>>&
operator<<<__mpz_struct [1], __mpz_struct
[1]>(std::__1::basic_ostream<char, std::__1::char_traits<char>>&,
__gmp_expr<__mpz_struct [1], __mpz_struct [1]> const&) in
find_largest_left_truncatable_prime_in_a_given_base-ef7644.o
ld: symbol(s) not found for architecture arm64
clang++: error: linker command failed with exit code 1 (use -v to see
invocation)
According to
add -lgmpxx; that worked for me.
On Jul 30, 2025, at 14:07, Richard L. Hamilton wrote: You may need -lc++
You never need to add -lc++, as long as you use a C++ compiler like clang++ to do the linking, which Ken did.
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