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Re: [MinGW] Set NATIVE_SYSTEM_HEADER_DIR relative to configured prefix

Danny Smith wrote:

> Historically, mingw host doesn't have a "system include dir".    Instead
> host relies on a local dir being in consistent place relative to exec
> prefix, and this in turn means that it is consistent relative to the gcc
> driver, ie, in x-mingw:

Yes, we use a similar technique for our cross releases; the "system
headers" are in $prefix/sysroot/include.  We point the system root at
that $prefix/sysroot, and arrange for the entire toolchain to be
relocatable.  Then, you can put it anywhere you like, and it still finds
the system headers.

I don't think it's a good idea to change the NATIVE_SYSTEM_HEADER_DIR
default, as that means that if I build a MinGW compiler, for an existing
MinGW system, the header directory will be incorrect.  In other words,
changing NATIVE_SYSTEM_HEADER_DIR is making MinGW more unlike other
systems, but not solving the problem in 100% of the cases.

I understand that something about sysroot isn't working for MinGW; to
me, it sounds like that's the right mechanism for solving this problem.

I'm going to respond to Ranjit's mail about the particular macros

Mark Mitchell
(650) 331-3385 x713

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