Run import std; with gcc successfully.

:-) P

First I followed this link to get gcc import std; c++ working, https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Modules.html, but oops, when I removed the gcm.cache dir to test it, and repeated steps again, it did not work.

Then I found this link https://stackoverflow.com/questions/76154680/how-to-use-module-std-with-gcc, after I removed gcm.cache and did the steps again, it still worked.

Great, I can import std; with gcc now.

Build and install gcc from source

git clone --depth=1 git://gcc.gnu.org/git/gcc.git SomeLocalDir

alias gpp

Make an lazy alias gpp to the built & installed g++ program.

alias gpp=/path/to/g++

Compile c++ modules program (std) at the first time

// test.cpp

import std;

int main()
{
	std::cout << "Hello c++!" << std::endl;
}

Compile:

gpp -fmodules -fsearch-include-path bits/std.cc test.cpp -std=c++26 -o test

It is a little slow at the first time.

Compile c++ modules program (std) not at the first time

Compile:

gpp -fmodules test.cpp -std=c++26 -o test

It is much more fast by not specifying -fsearch-include-path bits/std.cc, when running not at the first time.

P.

Remove gcm.cache and repeat above steps, it still works!

Mar 04, 2025

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cpp/c++

c++ std::exception:

std::cout.write(err.data(), err.size());

std::cout << std::endl;

caught:

  ===================================
  #  The c++ programming language.  #
  #                                 #
  #  Join c++                       #
  #  Deck                           #
  ===================================

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