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* configure.ac: Include `newlib/headers.m4' and
`libc-parts/headers.m4'.
(ccheaders, SYSINCLUDES): Remove.
(USER_CPPFLAGS, USER_LDFLAGS, KERNEL_CPPFLAGS): Adapt to building with
a cross compiler.
(USER_LDADD): Remove.
(CHECK_CPPFLAGS): Define `_GNU_SOURCE' and `_ENABLE_TESTS'.
(CHECK_CFLAGS): New.
(HAVE_CROSS, TRAVERSE_HIERARCHY): New conditionals.
(--enable-tests, ENABLE_TESTS): New command line option with
conditional.
(libc.a.in): Instantiate as `sysroot/lib/libc.a'.
* libc.a.in: Rewritten to no longer specify file paths, but instead
linker switches.
* Makefile.am (SUBDIRS): Only recurse into if [TRAVERSE_HIERARCHY].
(libc-stmp): Only consider if [HAVE_CROSS].
[! HAVE_CROSS && ! ENABLE_TESTS]: Build `cross-compiler'.
(cross-compiler): New target.
Include `Makefoo.am', `binutils/Makefrag.am' and `gcc/Makefrag.am'.
* Makefoo.am: New file.
* binutils: New directory.
* gcc: Likewise.
* README: Update.
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