* gnu/packages/patches/gcc-cross-environment-variables.patch: Also use CROSS_
variants: CROSS_C_INCLUDE_PATH, CROSS_CPLUS_INCLUDE_PATH,
CROSS_OBJC_INCLUDE_PATH, CROSS_OBJCPLUS_INCLUDE_PATH to be used for system
libraries, see
https://lists.gnu.org/archive/html/guix-devel/2016-04/msg00620.html.
* gnu/packages/cross-base.scm (cross-gcc, cross-gcc-arguments, cross-libc):
Use CROSS_*_INCLUDE_PATH (WAS: CPATH).
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
* gnu/packages/patches/gcc-cross-environment-variables.patch: Add two
hunks, most notably one that changes GCC to honor LIBRARY_PATH_ENV
when cross-compiling.
* gnu/packages/cross-base.scm: New file.
* gnu/packages/patches/gcc-cross-environment-variables.patch: New file.
* Makefile.am (MODULES): Add cross-base.scm.
(dist_patch_DATA): Add gcc-cross-environment-variables.patch.
* gnu/packages/base.scm (gcc-4.7): Use `LDFLAGS_FOR_TARGET' instead of
`LDFLAGS_FOR_BUILD', and use `-B' instead of `-L'.
* gnu/packages/bootstrap.scm (glibc-dynamic-linker): Add case for
"mips64el-linux".
