用于VxWorks的GCC交叉编译器无法编译C ++

Question

I'm trying to port a Linux library to run on VxWorks. I have successfully built binutils and gcc to target i486-wrs-vxworks and I can successfully build a simple C program. However, when I try to compile C++, things break.

I have a simple Hello World program:

#include <string>
#include <iostream>
int main()
{
    std::string s = "Hello World";
    std::cout << s << std::endl;
    return 0;
}

To build it, I call:

i486-wrs-vxworks-gcc -I/home/kyle/vxworks-6.9/target/usr/h -I/home/kyle/vxworks-6.9/target/usr/h/c++ hello.cpp

This always fails with the message:

In file included from /home/kyle/vxworks-6.9/target/usr/h/c++/cerrno:4:0,
             from /home/kyle/vxworks-6.9/target/usr/h/c++/xlocnum:4,
             from /home/kyle/vxworks-6.9/target/usr/h/c++/ios:4,
             from /home/kyle/vxworks-6.9/target/usr/h/c++/ostream:4,
             from /home/kyle/vxworks-6.9/target/usr/h/c++/istream:4,
             from /home/kyle/vxworks-6.9/target/usr/h/c++/string:4,
             from hello.cpp:1:
/usr/local/lib/gcc/i486-wrs-vxworks/4.6.4/../../../../i486-wrs-vxworks/include/yvals.h:4:24: fatal error: yvals.h: No such file or directory

If I go look inside /usr/local/i486-wrs-vxworks/include/yvals.h , this is what I see:

/* yvals.h values header for conforming compilers on various systems */
#if (defined(__cplusplus) && defined(__GNUC__))
/* GCC C++ has it's own yvals.h */
#include_next <yvals.h>
#else /* __cplusplus && __GNUC__ */
#ifndef _YVALS
#define _YVALS
#ifdef _NO_WINDRIVER_MODIFICATIONS
#include <stdarg.h>
#endif
...

It appears that there is another yvals.h that needs to be included, but I can't find it anywhere. Did I just fail at building gcc correctly, or is there a way to fix this?

Answer 1

Which version of VxWorks are you using for this?

I have a fuzzy recollection that when upgrading VxWorks versions in the past there was a syntax error in yvals.h that was I needed to work around and it was fixed in a subsequent version.

Also, you can get the gcc cross compiler pre-built from WindRiver. Just login to windriver.com/support with your licence number and head to "Downloads" for your product version.

Answer 2

I went through a recent cross compiling nightmare myself (not VxWorks related) except that instead of yvals.h, I was having grief with stddef.h. The problem turned out to be that I needed to specify the include paths for the system header files.

Here are the steps it took me to solve my error messages. Feel free to modify as appropriate.

Create a file foo.c

#include <stddef.h>   /* The problem header file (yvals.h for you?) */

int main (void) {
    return 0;
}

Compile it with your compiler of choice

$(CC) foo.c -E

Note the include paths it uses and set them as your system header file list using the

-isystem <include path>

option.

Hope this helps.