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+# ===========================================================================
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+# http://www.gnu.org/software/autoconf-archive/ax_prog_cc_for_build.html
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+# ===========================================================================
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+#
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+# SYNOPSIS
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+#
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+# AX_PROG_CC_FOR_BUILD
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+#
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+# DESCRIPTION
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+#
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+# This macro searches for a C compiler that generates native executables,
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+# that is a C compiler that surely is not a cross-compiler. This can be
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+# useful if you have to generate source code at compile-time like for
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+# example GCC does.
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+#
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+# The macro sets the CC_FOR_BUILD and CPP_FOR_BUILD macros to anything
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+# needed to compile or link (CC_FOR_BUILD) and preprocess (CPP_FOR_BUILD).
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+# The value of these variables can be overridden by the user by specifying
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+# a compiler with an environment variable (like you do for standard CC).
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+#
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+# It also sets BUILD_EXEEXT and BUILD_OBJEXT to the executable and object
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+# file extensions for the build platform, and GCC_FOR_BUILD to `yes' if
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+# the compiler we found is GCC. All these variables but GCC_FOR_BUILD are
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+# substituted in the Makefile.
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+#
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+# LICENSE
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+#
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+# Copyright (c) 2008 Paolo Bonzini <bonzini@gnu.org>
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+#
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+# Copying and distribution of this file, with or without modification, are
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+# permitted in any medium without royalty provided the copyright notice
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+# and this notice are preserved. This file is offered as-is, without any
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+# warranty.
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+
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+#serial 8
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+
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+AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD])
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+AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl
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+AC_REQUIRE([AC_PROG_CC])dnl
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+AC_REQUIRE([AC_PROG_CPP])dnl
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+AC_REQUIRE([AC_EXEEXT])dnl
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+AC_REQUIRE([AC_CANONICAL_HOST])dnl
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+
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+dnl Use the standard macros, but make them use other variable names
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+dnl
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+pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl
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+pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl
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+pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl
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+pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl
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+pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl
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+pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl
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+pushdef([ac_cv_objext], ac_cv_build_objext)dnl
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+pushdef([ac_exeext], ac_build_exeext)dnl
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+pushdef([ac_objext], ac_build_objext)dnl
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+pushdef([CC], CC_FOR_BUILD)dnl
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+pushdef([CPP], CPP_FOR_BUILD)dnl
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+pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl
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+pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
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+pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl
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+pushdef([host], build)dnl
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+pushdef([host_alias], build_alias)dnl
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+pushdef([host_cpu], build_cpu)dnl
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+pushdef([host_vendor], build_vendor)dnl
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+pushdef([host_os], build_os)dnl
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+pushdef([ac_cv_host], ac_cv_build)dnl
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+pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
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+pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
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+pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
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+pushdef([ac_cv_host_os], ac_cv_build_os)dnl
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+pushdef([ac_cpp], ac_build_cpp)dnl
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+pushdef([ac_compile], ac_build_compile)dnl
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+pushdef([ac_link], ac_build_link)dnl
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+
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+save_cross_compiling=$cross_compiling
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+save_ac_tool_prefix=$ac_tool_prefix
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+cross_compiling=no
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+ac_tool_prefix=
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+
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+AC_PROG_CC
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+AC_PROG_CPP
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+AC_EXEEXT
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+
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+ac_tool_prefix=$save_ac_tool_prefix
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+cross_compiling=$save_cross_compiling
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+
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+dnl Restore the old definitions
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+dnl
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+popdef([ac_link])dnl
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+popdef([ac_compile])dnl
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+popdef([ac_cpp])dnl
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+popdef([ac_cv_host_os])dnl
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+popdef([ac_cv_host_vendor])dnl
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+popdef([ac_cv_host_cpu])dnl
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+popdef([ac_cv_host_alias])dnl
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+popdef([ac_cv_host])dnl
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+popdef([host_os])dnl
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+popdef([host_vendor])dnl
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+popdef([host_cpu])dnl
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+popdef([host_alias])dnl
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+popdef([host])dnl
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+popdef([LDFLAGS])dnl
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+popdef([CPPFLAGS])dnl
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+popdef([CFLAGS])dnl
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+popdef([CPP])dnl
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+popdef([CC])dnl
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+popdef([ac_objext])dnl
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+popdef([ac_exeext])dnl
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+popdef([ac_cv_objext])dnl
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+popdef([ac_cv_exeext])dnl
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+popdef([ac_cv_prog_cc_g])dnl
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+popdef([ac_cv_prog_cc_cross])dnl
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+popdef([ac_cv_prog_cc_works])dnl
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+popdef([ac_cv_prog_gcc])dnl
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+popdef([ac_cv_prog_CPP])dnl
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+
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+dnl Finally, set Makefile variables
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+dnl
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+BUILD_EXEEXT=$ac_build_exeext
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+BUILD_OBJEXT=$ac_build_objext
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+AC_SUBST(BUILD_EXEEXT)dnl
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+AC_SUBST(BUILD_OBJEXT)dnl
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+AC_SUBST([CFLAGS_FOR_BUILD])dnl
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+AC_SUBST([CPPFLAGS_FOR_BUILD])dnl
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+AC_SUBST([LDFLAGS_FOR_BUILD])dnl
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+])
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Adam Cozzette