60e05d7388
Override the cross_compiling and ac_tool_prefix variables by reassigning to them instead of redefining the macros. Redefining them will actually cause the variable names to be replaced instead of their content. Furthermore push the definition of CPPFLAGS before running the checks for the build tools to avoid the host CPPFLAGS from leaking into the build CPPFLAGS. While at it drop the redefinition of AC_TRY_COMPILER which hasn't been used since autoconf 2.50 and make sure that all definitions are properly popped when done (LDFLAGS, ac_cv_prog_CPP, ac_cv_prog_CXXCPP). Acked-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
110 lines
3.5 KiB
Plaintext
110 lines
3.5 KiB
Plaintext
# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_prog_cxx_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_CXX_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 CXX_FOR_BUILD and CXXCPP_FOR_BUILD macros to anything
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# needed to compile or link (CXX_FOR_BUILD) and preprocess (CXXCPP_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 CXX).
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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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# Copyright (c) 2012 Avionic Design GmbH
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#
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# Based on the AX_PROG_CC_FOR_BUILD macro by Paolo Bonzini.
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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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#serial 5
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AU_ALIAS([AC_PROG_CXX_FOR_BUILD], [AX_PROG_CXX_FOR_BUILD])
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AC_DEFUN([AX_PROG_CXX_FOR_BUILD], [dnl
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AC_REQUIRE([AX_PROG_CC_FOR_BUILD])dnl
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AC_REQUIRE([AC_PROG_CXX])dnl
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AC_REQUIRE([AC_PROG_CXXCPP])dnl
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AC_REQUIRE([AC_CANONICAL_SYSTEM])dnl
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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_CXXCPP], ac_cv_build_prog_CXXCPP)dnl
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pushdef([ac_cv_prog_gxx], ac_cv_build_prog_gxx)dnl
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pushdef([ac_cv_prog_cxx_works], ac_cv_build_prog_cxx_works)dnl
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pushdef([ac_cv_prog_cxx_cross], ac_cv_build_prog_cxx_cross)dnl
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pushdef([ac_cv_prog_cxx_g], ac_cv_build_prog_cxx_g)dnl
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pushdef([CXX], CXX_FOR_BUILD)dnl
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pushdef([CXXCPP], CXXCPP_FOR_BUILD)dnl
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pushdef([CXXFLAGS], CXXFLAGS_FOR_BUILD)dnl
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pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
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pushdef([CXXCPPFLAGS], CXXCPPFLAGS_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_cxxcpp], ac_build_cxxcpp)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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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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AC_PROG_CXX
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AC_PROG_CXXCPP
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ac_tool_prefix=$save_ac_tool_prefix
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cross_compiling=$save_cross_compiling
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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_cxxcpp])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([CXXCPPFLAGS])dnl
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popdef([CPPFLAGS])dnl
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popdef([CXXFLAGS])dnl
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popdef([CXXCPP])dnl
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popdef([CXX])dnl
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popdef([ac_cv_prog_cxx_g])dnl
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popdef([ac_cv_prog_cxx_cross])dnl
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popdef([ac_cv_prog_cxx_works])dnl
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popdef([ac_cv_prog_gxx])dnl
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popdef([ac_cv_prog_CXXCPP])dnl
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dnl Finally, set Makefile variables
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dnl
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AC_SUBST([CXXFLAGS_FOR_BUILD])dnl
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AC_SUBST([CXXCPPFLAGS_FOR_BUILD])dnl
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])
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