GCC builds with relative searchpaths instead of absolute

[Nuno Silva <little.coding.fox@gmail.com>]

Hello,
This is my first post in this mailing list, so I apologize if I do
anything wrong.

I'm working on a hobby operating system and, as part of making apps
for it, I'm trying to port gcc to it. To be clear: I already have my
cross compiler, I just want to make gcc run inside the OS.

However, gcc doesn't seem to find cc1, and when I look into the
searchdirs it shows relative paths (prepended with ".."), which means
it would never find cc1.
I'm configuring GCC with the following:

configure --host=x86_64-toast --prefix=/usr --target=x86_64-toast
--with-sysroot=/ --with-build-sysroot=<my sysroot dir>
--enable-languages=c,c++ --enable-initfini-array --disable-multilib
--disable-nls --enable-lto --with-system-zlib CFLAGS=-O2 CXXFLAGS=-O2

Then running make all-gcc all-target-libgcc all-target-libcstdc++-v3

Is there some sort of setting I could use to change the searchdirs to absolute?

Thank you very much for your time.