[PATCH] configure: Add --with-gperf option (needed for using Mac OS X as build machine).

[Ray Donnelly <mingw dot android at gmail dot com>]

# HG changeset patch
# User Ray Donnelly <mingw.android@gmail.com>
# Date 1379123123 -3600
#      Sat Sep 14 02:45:23 2013 +0100
# Node ID 39ad31b0cb08687792b868ed1397360d4b6ba322
# Parent  86a8d1d467c86f962033fab6a63f5cae1524c621
Add --with-gperf=<PATH> option

On OS X, Apple supply an old gperf (3.0.3) with xcode and
xcode commandline tools which causes build failures:

./zconf.hash.c:183:17: error: expected expression
{offsetof(struct kconf_id_strings_t, kconf_id_strings_str2),

.. upgrading to gperf 3.0.4 was sufficient to fix this,
so this option allows the user to specify the gperf
program that they wish to use.

To install gperf 3.0.4 from homebrew, I did:

    brew tap homebrew/dupes
    brew install homebrew/dupes/gperf

.. then passed --with-gperf=$BREWFIX/Cellar/gperf/3.0.4/bin/gperf
to configure

Signed-off-by: Ray Donnelly <mingw.android@gmail.com>

diff -r 86a8d1d467c8 -r 39ad31b0cb08 Makefile.in
--- a/Makefile.in Thu Aug 01 20:24:35 2013 +0000
+++ b/Makefile.in Sat Sep 14 02:45:23 2013 +0100
@@ -68,6 +68,7 @@
 export objdump         := @OBJDUMP@
 export readelf         := @READELF@
 export patch           := @PATCH@
+export gperf           := @GPERF@
 export CC              := @CC@
 export CPP             := @CPP@
 export CPPFLAGS        := @CPPFLAGS@
@@ -212,6 +213,7 @@
   echo 'export objdump=$(objdump)';         \
   echo 'export readelf=$(readelf)';         \
   echo 'export patch=$(patch)';             \
+  echo 'export gperf=$(gperf)';             \
  ) >$@

 paths.sh: FORCE
@@ -228,6 +230,7 @@
   echo 'export objdump="$(objdump)"';       \
   echo 'export readelf="$(readelf)"';       \
   echo 'export patch="$(patch)"';           \
+  echo 'export gperf="$(gperf)"';           \
  ) >$@

 config/configure.in: FORCE
diff -r 86a8d1d467c8 -r 39ad31b0cb08 configure.ac
--- a/configure.ac Thu Aug 01 20:24:35 2013 +0000
+++ b/configure.ac Sat Sep 14 02:45:23 2013 +0100
@@ -143,15 +143,19 @@
     AS_HELP_STRING([--with-readelf=PATH],
                    [Specify the full PATH to GNU readelf]),
     [READELF=$withval])
+AC_ARG_WITH([gperf],
+    AS_HELP_STRING([--with-gperf=PATH],
+                   [Specify the full PATH to GNU gperf]),
+    [GPERF=$withval])

 AC_PROG_RANLIB
 ACX_PATH_TOOL_REQ([OBJCOPY], [objcopy])
 ACX_PATH_TOOL_REQ([OBJDUMP], [objdump])
 ACX_PATH_TOOL_REQ([READELF], [readelf])
+ACX_PATH_TOOL_REQ([GPERF], [gperf])

 ACX_CHECK_PROGS_REQ([bison], [bison])
 ACX_CHECK_PROGS_REQ([flex], [flex])
-ACX_CHECK_PROGS_REQ([gperf], [gperf])
 ACX_CHECK_PROGS_REQ([makeinfo], [makeinfo])
 ACX_CHECK_PROGS_REQ([cut], [cut])
 ACX_CHECK_PROGS_REQ([stat], [stat])
diff -r 86a8d1d467c8 -r 39ad31b0cb08 kconfig/Makefile
--- a/kconfig/Makefile Thu Aug 01 20:24:35 2013 +0000
+++ b/kconfig/Makefile Sat Sep 14 02:45:23 2013 +0100
@@ -84,7 +84,7 @@

 zconf.hash.c: zconf.gperf
  @echo "  GPERF  '$@'"
- @gperf < $< > $@
+ @$(gperf) < $< > $@

 lex.zconf.c: zconf.l
  @echo "  LEX    '$@'"

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