Re: grub2 boot root-on-zfs errors

[Beeblebrox <zaphod@berentweb.com>]

@ Vladimir:
>> Please attach your config.log
Enclosed as requested (for latest run)

A new problem: I updated the git repo to latest and tried to re-build.
Build was started with:
./autogen.sh USE_GCC=any --disable-werror
./configure USE_GCC=any --disable-werror
gmake USE_GCC=any
However, compile fails as below. I cannot seem to get the compiler to
use gcc46 which is on my system - it insists on using clang.

cc -DHAVE_CONFIG_H -I.  -Wall -W -I./include -DGRUB_UTIL=1
-DGRUB_FILE=\"grub-core/osdep/platform_unix.c\" -I. -I. -I. -I.
-I./include -I./include -I./grub-core/lib/libgcrypt-grub/include
-I./grub-core/lib/libgcrypt-grub/src/ -I./grub-core/gnulib
-I./grub-core/gnulib  -I/usr/local/include -Wall -W -Wshadow
-Wold-style-definition -Wpointer-arith -Wundef -Wextra -Wattributes
-Wchar-subscripts -Wcomment -Wdeprecated-declarations
-Wdisabled-optimization -Wdiv-by-zero -Wendif-labels -Wfloat-equal
-Wformat-extra-args -Wformat-security -Wformat-y2k -Wimplicit
-Wimplicit-function-declaration -Wimplicit-int -Winit-self
-Wint-to-pointer-cast -Winvalid-pch -Wmain -Wmissing-braces
-Wmissing-field-initializers -Wmissing-format-attribute -Wmultichar
-Wnonnull -Woverflow -Wparentheses -Wpointer-arith
-Wpointer-to-int-cast -Wreturn-type -Wsequence-point -Wshadow
-Wsign-compare -Wstrict-aliasing -Wswitch -Wtrigraphs -Wundef
-Wunknown-pragmas -Wunused -Wunused-function -Wunused-label
-Wunused-parameter -Wunused-value  -Wunused-variable -Wvariadic-macros
-Wvolatile-register-var -Wwrite-strings -Wnested-externs
-Wstrict-prototypes -Wpointer-sign -Wcast-align -Wno-undef
-Wno-sign-compare -Wno-unused -Wno-unused-parameter
-Wno-redundant-decls -Wno-unreachable-code -Wno-conversion
-Wno-old-style-definition   -MT
grub-core/osdep/grub_mkrescue-platform_unix.o -MD -MP -MF
grub-core/osdep/.deps-util/grub_mkrescue-platform_unix.Tpo -c -o
grub-core/osdep/grub_mkrescue-platform_unix.o `test -f
'grub-core/osdep/platform_unix.c' || echo
'./'`grub-core/osdep/platform_unix.c
In file included from grub-core/osdep/platform_unix.c:2:
grub-core/osdep/unix/platform.c:34:28: error: use of undeclared
identifier 'PATH_MAX'
  char *ret = xmalloc (2 * PATH_MAX);
                           ^
grub-core/osdep/unix/platform.c:35:25: error: use of undeclared
identifier 'PATH_MAX'
  char *end = ret + 2 * PATH_MAX - 1;
                        ^
2 errors generated.
gmake[2]: *** [grub-core/osdep/grub_mkrescue-platform_unix.o] Error 1
gmake[2]: Leaving directory `/asp/git/grub'