• via Digitalmars-d-bugs (49/49) Aug 21 2016 https://issues.dlang.org/show_bug.cgi?id=16408

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=16408

          Issue ID: 16408
           Summary: Converting char* to string with std.conv.to!string is
                    wrong in release mode
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody puremagic.com
          Reporter: matthew.brennan.jones gmail.com

This program prints WASD in debug mode as expected, but prints DDDD in release
mode. My guess is std.conv.to!string is failing with char* for some reason.

DMD 2.071.1 on Linux and Windows 10.

Works as expected:
dub run --arch=x86_64 --build=debug

Wrong output:
dub run --arch=x86_64 --build=release

// maid.d
import std.stdio;
import std.string;
import std.conv;
import derelict.sdl2.sdl;


int main() {
    DerelictSDL2.load(SharedLibVersion(2, 0, 2));

    string footer = "%s%s%s%s".format(
        to!string(SDL_GetKeyName(SDLK_w)),
        to!string(SDL_GetKeyName(SDLK_a)),
        to!string(SDL_GetKeyName(SDLK_s)),
        to!string(SDL_GetKeyName(SDLK_d)),
    );
    stdout.writeln(footer);

    return 0;
}

// dub.json
{
    "name": "main",
    "targetType": "executable",

    "dependencies": {
        "derelict-sdl2": "~>2.0",
    },

    "sourceFiles": [
        "main.d"
    ],
}

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