Re: headers and libs

[andy at softbookpress dot com]

What about a system that does not have /usr/include and /usr/lib directories ?
I'm on cygwin and I'm building  gcc3 for arm-elf . There are no <target>
includes per se - the "target"  is not Unix and has its own runtime
implementation .

Thx Andy


>On Wed, 04 Jul 2001 11:04:34 -0400
>Stuart Kenny <skenny@solidum.com> wrote:
>
>> So are these the headers and libraries normally found in the /usr/include
>> and /usr/lib directories (on an appropriate machine?)
>
> If you mean the target machines, you are right... Using the host-headers
>doesn't work.
>
>> We're trying to centralize our building environment for multi-platform
>> development, as well as becoming less vulnerable to IT changing elements
>> in our build environment.
>>
>> I'm trying to make cross compilers from Linux (or NetBSD) to Linux,
>> NetBSD, Mingw32 and Sun-solaris2.7 (for now, more to follow)
>>
>> I'm having tons of problems, usually with headers.  Am I using the wrong
>> ones?
>
> For Linux-targets you must select to use some kernel headers ('include/asm'
>and 'include/linux'), to be a part of the 'target headers', but these may be
>updated later.  Only the 'limits.h' from the standard C headers must be seen
>in the '$prefix/$target/sys-include' during the build, all the others, and
>this too, should be in the '$prefix/$target/include'. The GCC build searches
>them there with the '-I$(build_tooldir)/include' in the 'xgcc' command line.
>
> The symlinks between the Linux libs must be fixed, the 'libc.so' edited and
>so on, before they are in condition. Pointing to the uninstalled libs
>using the
>'--with-libs=' and expecting the configure to do all the fixing in the
>symlinks and the 'libc.so'-editing is vain.
>
> The NetBSD and Solaris7 targets also have equivalent issues for symlinks
>etc. Knowing the targets is a must, so the Solaris2 FAQ etc. are useful,
>the same problems arise with the native and cross... AFAIK the ELF-based
>NetBSD 1.5 isn't yet very well supported as the target, and Mingw must be
>learned via 'www.mingw.org'...
>
> Also the X11-headers and libs belong to the target and you must decide where
>to put them in the host system. The '$prefix/$target/X11/include' (symlinked
>to '$prefix/$target/include/X11') and the '$prefix/$target/X11/lib' could be
>one solution.
>
> The standard headers and the Win32-API headers can be keeped separated in
>the 'include' and 'sys-include' (both will be searched) in Mingw...
>
> So there are so much work to do which the '--with-headers' and '--with-libs'
>don't do. Therefore learning the $prefix/$target as the important place for
>the target stuff is highly recommended. BTW, also the target binutils will
>be installed there into the '$prefix/$target/bin' and the
>'$prefix/$target/lib/ldscripts'.
>
>> I know cross compilers are usually used for imbedded systems, it is hard
>> to find info on non-imbedded applications.
>
> The GCC manual's "Installation / Cross-Compiler" then handles only the
>non-embedded case. Using 'info' to see the GCC manual helps, if only the
>manual was built as "Using and Porting...", not only "Using...". This is
>the most important reason to not see anything about cross-compilers in
>the GCC-manual... Having the "User's Manual" is not the same as having
>the "User's and Porter's Manual"...
>
> Downloading the RedHat's PDF manual sets for '99r1p1'  and '00r1' via:
>
>    http://www.redhat.com/support/manuals/gnupro.html
>
>should give quite a lot needed 'info' (although the embedded aspect can
>be strong in them).
>
>Cheers, Kai
>
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