path: root/m4/ax_prog_cxx_for_build.m4
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Diffstat (limited to 'm4/ax_prog_cxx_for_build.m4')
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diff --git a/m4/ax_prog_cxx_for_build.m4 b/m4/ax_prog_cxx_for_build.m4
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+# ===========================================================================
+# ===========================================================================
+# This macro searches for a C++ compiler that generates native executables,
+# that is a C++ compiler that surely is not a cross-compiler. This can be
+# useful if you have to generate source code at compile-time like for
+# example GCC does.
+# The macro sets the CXX_FOR_BUILD and CXXCPP_FOR_BUILD macros to anything
+# needed to compile or link (CXX_FOR_BUILD) and preprocess (CXXCPP_FOR_BUILD).
+# The value of these variables can be overridden by the user by specifying
+# a compiler with an environment variable (like you do for standard CXX).
+# Copyright (c) 2008 Paolo Bonzini <>
+# Copyright (c) 2012 Avionic Design GmbH
+# Based on the AX_PROG_CC_FOR_BUILD macro by Paolo Bonzini.
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+#serial 5
+pushdef([AC_TRY_COMPILER], [
+cat > conftest.$ac_ext << EOF
+#line __oline__ "configure"
+#include "confdefs.h"
+# If we can't run a trivial program, we are probably using a cross
+# Fail miserably.
+if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext} && (./conftest;
+exit) 2>/dev/null; then
+ [$2]=yes
+ echo "configure: failed program was:" >&AC_FD_CC
+ cat conftest.$ac_ext >&AC_FD_CC
+ [$2]=no
+rm -fr conftest*])dnl
+dnl Use the standard macros, but make them use other variable names
+pushdef([cross_compiling], [#])dnl
+pushdef([ac_cv_prog_CXXCPP], ac_cv_build_prog_CXXCPP)dnl
+pushdef([ac_cv_prog_gxx], ac_cv_build_prog_gxx)dnl
+pushdef([ac_cv_prog_cxx_works], ac_cv_build_prog_cxx_works)dnl
+pushdef([ac_cv_prog_cxx_cross], ac_cv_build_prog_cxx_cross)dnl
+pushdef([ac_cv_prog_cxx_g], ac_cv_build_prog_cxx_g)dnl
+pushdef([CXX], CXX_FOR_BUILD)dnl
+pushdef([host], build)dnl
+pushdef([host_alias], build_alias)dnl
+pushdef([host_cpu], build_cpu)dnl
+pushdef([host_vendor], build_vendor)dnl
+pushdef([host_os], build_os)dnl
+pushdef([ac_cv_host], ac_cv_build)dnl
+pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
+pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
+pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
+pushdef([ac_cv_host_os], ac_cv_build_os)dnl
+pushdef([ac_cxxcpp], ac_build_cxxcpp)dnl
+pushdef([ac_compile], ac_build_compile)dnl
+pushdef([ac_link], ac_build_link)dnl
+pushdef([ac_tool_prefix], [#])dnl
+dnl Restore the old definitions
+dnl Finally, set Makefile variables