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Re: What is the best way to add a target specific system header directory
- From: Xi Ruoyao <ryxi at stu dot xidian dot edu dot cn>
- To: "Martin J. O'Riordan" <martin dot oriordan at movidius dot com>, gcc-help at gcc dot gnu dot org
- Cc: ryxi at stu dot xidian dot edu dot cn
- Date: Tue, 09 May 2017 12:03:21 +0800
- Subject: Re: What is the best way to add a target specific system header directory
- Authentication-results: sourceware.org; auth=none
- References: <026101d2c82b$67e0f270$37a2d750$@movidius.com>
On 2017-05-08 19:46 +0100, Martin J. O'Riordan wrote:
> I am building GCC as a cross compiler for the Sparc Leon processor, it has
> been working well for me for several years and is currently at v6.3.0.
>
> However, a recent change I want to make is to provide an additional
> non-standard system header directory to be searched when '<...>' is used,
> and this directory is located relative to the 'gcc' binary; in this case
> relative to:
>
> <wherever>/bin/triple-gcc
So you have to determine where the executable triple-gcc is. For linux
we should readlink /proc/self/exe, but it's not portable.
> I have tried using '--with-native-system-header-dir' but this wants an
> absolute path. I want to avoid redefining 'INCLUDE_DEFAULTS' with my own
> custom replacement. Substituting for '/usr/include' is okay too, because
> the host version is not meaningful the context of cross compilation.
>
> Any recommendations on how to configure for this, or should I add something
> (a '#define' for example) to 'gcc/gcc/config/sparc/sparc.h'?
It seems GCC doesn't have this functionality. I think we have to implement
this ourselves.
> Thanks,
>
> MartinO
>
>
--
Xi Ruoyao <ryxi@stu.xidian.edu.cn>
School of Aerospace Science and Technology, Xidian University