Export the firmware type as a cpp variable so we can #ifdef.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>

This eliminates the forking and pushes the build under the efi32/ and
 efi64/ object directories eliminating a build race and preventing the
 build from breaking as gnu-efi takes a few seconds to complete.

Depends on gnu-efi commit 52d88dd

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>

We need to specify -m32/-m64 even when we are processing assembly.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Disable the stack protector if on by default.

Copied from https://bugs.gentoo.org/show_bug.cgi?id=495146.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

We need biosboot.o for shuffle and boot now.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

If a dependency is added to the newer rules, make will choose the easier
rules instead of the preferred rules.

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>

Not all distributions point /bin/sh at /bin/bash, so remove some
bashisms (pushd/popd) and require that build-gnu-efi.sh be run from the
Syslinux object directory.

Also, swap realpath(1) for readlink(1) because the former isn't
available on Debian.

Reported-by: Ferenc Wagner <wferi@niif.hu>
Reported-by: Celelibi <celelibi@gmail.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

Guard against future changes by requiring that the gnu-efi build scripts
exit with success.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>