Re: GPS: Including C headers from paths which are not configured in Source_Dirs

["Rego, P." <pvrego@gmail.com>]

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
> 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?

Thanks.

> 
> But why are you using #include "tools/mytool.h" rather than #include
> <tools/mytools.h>? (I've never understood why VxWorks uses this style).

Actually I don't know. It's a (big) legacy code, so I'd rather not changing this (if possible).