Why i get the following Error, when i try to compile a simple "Hello World" that imports std.net.curl=

The Error:
# dmd hello.d
/usr/lib/x86_64-linux-gnu/libphobos2.a(curl.o): In function `_D3std3net4curl4Curl19_sharedStaticCtor28FZv':
std/net/curl.d:(.text._D3std3net4curl4Curl19_sharedStaticCtor28FZv+0xf): undefined reference to `curl_global_init'
/usr/lib/x86_64-linux-gnu/libphobos2.a(curl.o): In function `_D3std3net4curl4Curl19_sharedStaticDtor29FZv':
std/net/curl.d:(.text._D3std3net4curl4Curl19_sharedStaticDtor29FZv+0x5): undefined reference to `curl_global_cleanup'
collect2: ld returned 1 exit status
--- errorlevel 1

The Code:
import std.stdio;
import std.net.curl;

void main()
{
  writeln("hello world");
}

My Testsystem: Debian
# uname -a
Linux dexplorer 2.6.32-5-amd64 #1 SMP Mon Feb 25 00:26:11 UTC 2013 x86_64 GNU/Linux

curl is installed by apt-get install curl.

Thanks!

Fri, 26 Apr 2013 19:25:16 +0200: mab wrote

> Why i get the following Error, when i try to compile a simple "Hello World" that imports std.net.curl=
> 
> The Error:
> # dmd hello.d /usr/lib/x86_64-linux-gnu/libphobos2.a(curl.o): In
> function `_D3std3net4curl4Curl19_sharedStaticCtor28FZv':
> std/net/curl.d:(.text._D3std3net4curl4Curl19_sharedStaticCtor28FZv+0xf):
> undefined reference to `curl_global_init'
> /usr/lib/x86_64-linux-gnu/libphobos2.a(curl.o): In function
> `_D3std3net4curl4Curl19_sharedStaticDtor29FZv':
> std/net/curl.d:(.text._D3std3net4curl4Curl19_sharedStaticDtor29FZv+0x5):
> undefined reference to `curl_global_cleanup'
> collect2: ld returned 1 exit status --- errorlevel 1
> 
> The Code:
> import std.stdio;
> import std.net.curl;
> 
> void main()
> {
>    writeln("hello world");
> }
> 
> My Testsystem: Debian # uname -a Linux dexplorer 2.6.32-5-amd64 #1 SMP Mon Feb 25 00:26:11 UTC 2013 x86_64 GNU/Linux
> 
> curl is installed by apt-get install curl.
> 
> Thanks!

You have to link libcurl via argument:

  dmd hello.d -L-lcurl

On Fri, 26 Apr 2013 19:25:16 +0200, mab wrote:

> undefined reference to `curl_global_init'
> undefined reference to `curl_global_cleanup'

These functions are defined in libcurl. Make sure you have installed libcurl if it wasn't installed as a dependency for curl.

Thank you for answering. But it didnt work.

I get:
#dmd hello.d -L-lcurl
/usr/bin/ld: cannot find -lcurl
collect2: ld returned 1 exit status
--- errorlevel 1

Curl is installed, as also libcurl3.

I forget to mention that i am using "DMD64 D Compiler v2.062".
Is std.net.curl working in this Version? Because it also didnt work on my Windows 7 System.

On 04/26/2013 10:55 AM, mab wrote:

> Thank you for answering. But it didnt work.
>
> I get:
> #dmd hello.d -L-lcurl
> /usr/bin/ld: cannot find -lcurl

Try providing the directory that the curl library file is in:

#dmd hello.d -L-L/wherever/libcurl/is/in -L-lcurl

Ali

On 26/04/13 19:55, mab wrote:
> Thank you for answering. But it didnt work.
> 
> I get:
> #dmd hello.d -L-lcurl
> /usr/bin/ld: cannot find -lcurl
> collect2: ld returned 1 exit status
> --- errorlevel 1
> 
> Curl is installed, as also libcurl3.

You need to install the development curl package:

$ sudo apt-get install libcurl4-openssl-dev
or
$ sudo apt-get install libcurl4-gnutls-dev
or
$ sudo apt-get install libcurl4-nss-dev

> 
> I forget to mention that i am using "DMD64 D Compiler v2.062".
> Is std.net.curl working in this Version? Because it also didnt work on my Windows 7 System.
> 

-- 
Jordi Sayol

On Friday, 26 April 2013 at 17:55:59 UTC, mab wrote:
> Thank you for answering. But it didnt work.
>
> I get:
> #dmd hello.d -L-lcurl
> /usr/bin/ld: cannot find -lcurl
> collect2: ld returned 1 exit status
> --- errorlevel 1
>
> Curl is installed, as also libcurl3.
>
> I forget to mention that i am using "DMD64 D Compiler v2.062".
> Is std.net.curl working in this Version? Because it also didnt work on my Windows 7 System.

Do you know what the libcurl library is actually called on your system? (try "find /usr -name "*curl*.so*" " or "find /usr -name "*curl*.a*" )

if the name you find is e.g. "libcurl3.so" then you'll have to use the linker flag -lcurl3 instead of lcurl

p.s. Please don't be offended if you're already fully aware of this, it's just better to make sure the basics are covered first.

On Friday, 26 April 2013 at 18:14:04 UTC, Jordi Sayol wrote:
[...]
> You need to install the development curl package:
>
> $ sudo apt-get install libcurl4-openssl-dev
> or
> $ sudo apt-get install libcurl4-gnutls-dev
> or
> $ sudo apt-get install libcurl4-nss-dev
>
[...]

That´s it.
Thank you!