• Sergey (46/46) Oct 21 2022 Hi D-community.

Sergey <kornburn yandex.ru> writes:

Hi D-community.

I try to build and run very simple code on Alpine docker image - 
but have no luck with static builds and LTO.

The desired aim is to be able build it similar to C code 
compilation:
```c
gcc leibniz.c -o leibniz -O3 -s -static -flto -march=native 
-mtune=native -fomit-frame-pointer -fno-signed-zeros 
-fno-trapping-math -fassociative-math
```

I'd like to find working examples for both LDC and GDC for static 
compilation. If you have one, share it here please.

For LDC I've tried to install this packages:
```
RUN apk add --no-cache ldc gcc ldc-static binutils-gold
```
and build it with parameters:
```
cc=gcc ldc2 -O3 -release -mcpu=native -flto=full -linker=gold 
-flto-binary=/usr/bin/ld.gold 
-defaultlib=phobos2-ldc-lto,druntime-ldc-lto -m64 -static 
leibniz.d
```
Some issues that I've faced while trying different options:
- 'cc=clang' suddenly is not working. It still saying "can't find 
cc"
- Without explicit 'flto-binary=' the error was about "LLVMgold 
(plugin) not found".

The code:
```d
import std.stdio;
import std.file;

double pi = 1.0;
uint rounds;

void main() {
     auto file = File("./rounds.txt", "r");
     file.readf!"%d\n"(rounds);
     rounds += 2u;
     foreach(i; 2u .. rounds) {
         double x = -1.0 + 2.0 * (i & 0x1);
         pi += (x / (2u * i - 1u));
     }
     pi *= 4.0;
     writefln("%.16f", pi);
}
```