On Mon, Mar 30, 2009 at 03:54:31PM -0400, Harvey Chapman wrote: > I've looked through the manuals for gcc and ld, but would like some > advice regarding ignoring standard search paths for headers and > libraries. I've found "-nostdinc" for gcc and "-z nodefaultlib > -nostdlib" for ld. > > I'm trying to build an embedded OS in a separate directory and I want to > ensure that missing dependencies (in my destination directory) are not > automatically found in Ubuntu's standard paths (/usr/include, /usr/lib, > etc.). I figured that if I could clear the standard search paths, the > compiles would fail alerting me instantly about a missing dependency. > > I need to find the most portable way to do this that will work with as > many "./configure; make; make install" style packages. Should I use the > flags above inside CFLAGS and LDFLAGS variables? Or should I set CPATH > equal to nothing? You typically want to configure the compiler with: --with-sysroot=<dir> If you are using a newlib based library, you probably also want: --with-newlib --with-headers or --with-headers=<dir> Other switches to think about include: --with-build-sysroot=<dir> --without-headers --with-libs --with-build-time-tools=<dir> This should all be covered in the installation directions under the section 'Cross-Compiler-Specific Options'. -- Michael Meissner, IBM 4 Technology Place Drive, MS 2203A, Westford, MA, 01886, USA meissner@xxxxxxxxxxxxxxxxxx
