From: Qun-Ying <zhu.qunying@gmail.com>
Subject: Re: GPS: Including C headers from paths which are not configured in Source_Dirs
Date: Thu, 8 Oct 2015 11:11:39 -0700
Date: 2015-10-08T11:11:39-07:00 [thread overview]
Message-ID: <mv6bkl$g8s$2@speranza.aioe.org> (raw)
In-Reply-To: 8a324b12-4774-4a73-9e6e-c2b87d80f4e8@googlegroups.com
Rego, P. wrote:
> On Thursday, October 8, 2015 at 12:29:32 PM UTC-3, Simon Wright wrote:
>> package Compiler is
>> for Switches ("C") use ("-I/your/include/dir");
>> end Compiler;
>
> It did not work, maybe I did wrong. I built a test code to analyze better.
>
> --test.gpr
> project Test is
> for Languages use ("Ada", "C");
> for Source_Dirs use (".");
> for Main use ("ohmy.adb");
>
> package Compiler is
> for Switches ("C") use ("-Ioutsiders");
> end Compiler;
>
> end Test;
>
> --ohmy.adb
> procedure Ohmy is
> procedure Put_Ohmy;
> pragma Import (C, Put_Ohmy, "putOhmy");
> begin
> Put_Ohmy;
> end Ohmy;
>
> --bla.h
> void putOhmy(void);
>
> --bla.c
> #include <bla.h>
> #include "common/bla_other.h"
>
> void putOhmy (void) {
> putOhmyOther();
> }
>
> --outsiders/common/bla_other.h
> void putOhmyOther();
>
> --outsiders/common/bla_other.c
> #include <bla_other.h>
> #include <stdio.h>
>
> void putOhmyOther(){
> printf("Ohmy");
> }
>
> In this case, the built returns the error message:
>> gprbuild -d -Ptest.gpr ohmy.adb
>> gcc ohmy.o -o ohmy.exe
>> libtest.a(bla.o):bla.c:(.text+0x7): undefined reference to `putOhmyOther'
>> collect2.exe: error: ld returned 1 exit status
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Your program compile fine, it include your header file without problem,
but failed on linking.
As putOhmyOther is defined in common/bla_other.c, which is not compiled
in your project.
>> gprbuild: link of ohmy.adb failed
>> [2015-10-08 13:38:54] process exited with status 4, 100% (2/2), elapsed time: 03.94s
>
> Realize that the folder 'outsiders' is included in project, so (I guess)
> its subfolders should be accessible by an include like
> '#include "common/bla_other.h"' (?) So what did I do wrong?
If you are linking with 3rd party C lib, not only do you need to include
the header file, you also need to link with its lib.
next prev parent reply other threads:[~2015-10-08 18:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-08 14:32 GPS: Including C headers from paths which are not configured in Source_Dirs Rego, P.
2015-10-08 15:29 ` Simon Wright
2015-10-08 16:51 ` Rego, P.
2015-10-08 18:11 ` Qun-Ying [this message]
2015-10-08 20:49 ` Simon Wright
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