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Re: Primary and secondary sysroot?
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Hello Ian,
Thanks for reply, unfortunately setting extra flags does not help in
our case, as we want to conserve original build rules for any application.
A brilliant solution suggested by Richard Guenther on IRC is to place
first-priority includes and headers into
lib/gcc/x86_64-unknown-linux-gnu/4.6.4/ (or also in 32/, if multilib).
Then, this content would have higher priority than system
include/library paths. Thus, lib/gcc/x86_64-unknown-linux-gnu/4.6.4/
becomes primary root and system becomes secondary root!
- - D.
On 01/08/2013 08:37 AM, Ian Lance Taylor wrote:
> On Mon, Jan 7, 2013 at 2:47 AM, Dmitry Mikushin
> <dmitry@kernelgen.org> wrote:
>>
>> We have a version of GCC coming as additional toolchain for
>> several supported Linux distros. Moreover, package we are
>> shipping also contains modified glibc and some other libraries.
>> In this situation, applications built with this compiler should
>> first logically use its own sysroot, but in case when a
>> header/library from host's sysroot is needed - fallback to the
>> default "/usr" sysroot. I think this could be accomplished by
>> providing two sysroots - one primary, and secondary - to
>> complement it for the rest of things. Looks like currently gcc
>> only supports a single setting for TARGET_SYSTEM_ROOT. Do you see
>> any other options regarding this issue?
>
> You are correct: GCC only supports a single system root. But I
> think you can do what you want with appropriate -I and -L options,
> perhaps via the C_INCLUDE_PATH and LIBRARY_PATH environment
> variables.
>
> Ian
>
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