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Diffstat (limited to 'm4/ansi-c++.m4')
| -rw-r--r-- | m4/ansi-c++.m4 | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/m4/ansi-c++.m4 b/m4/ansi-c++.m4 new file mode 100644 index 0000000..8319dd3 --- /dev/null +++ b/m4/ansi-c++.m4 @@ -0,0 +1,128 @@ +# ansi-c++.m4 serial 9 +dnl Copyright (C) 2002-2003, 2005, 2010-2013 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +dnl From Bruno Haible. + +# Sets CXX_CHOICE to 'yes' or 'no', depending on the preferred use of C++. +# The default is 'yes'. If the configure.ac contains a definition of the +# macro gl_CXX_CHOICE_DEFAULT_NO, then the default is 'no'. In both cases, +# the user can change the value by passing the option --disable-cxx or +# --enable-cxx, respectively. + +AC_DEFUN([gl_CXX_CHOICE], +[ + AC_MSG_CHECKING([whether to use C++]) + dnl Plus signs are supported in AC_ARG_ENABLE starting with autoconf-2.66. + m4_version_prereq([2.66], + [m4_ifdef([gl_CXX_CHOICE_DEFAULT_NO], + [AC_ARG_ENABLE([c++], + [ --enable-c++ also build C++ sources], + [CXX_CHOICE="$enableval"], + [CXX_CHOICE=no])], + [AC_ARG_ENABLE([c++], + [ --disable-c++ do not build C++ sources], + [CXX_CHOICE="$enableval"], + [CXX_CHOICE=yes])])], + [m4_ifdef([gl_CXX_CHOICE_DEFAULT_NO], + [AC_ARG_ENABLE([cxx], + [ --enable-cxx also build C++ sources], + [CXX_CHOICE="$enableval"], + [CXX_CHOICE=no])], + [AC_ARG_ENABLE([cxx], + [ --disable-cxx do not build C++ sources], + [CXX_CHOICE="$enableval"], + [CXX_CHOICE=yes])])]) + AC_MSG_RESULT([$CXX_CHOICE]) + AC_SUBST([CXX_CHOICE]) +]) + +# gl_PROG_ANSI_CXX([ANSICXX_VARIABLE], [ANSICXX_CONDITIONAL]) +# Sets ANSICXX_VARIABLE to the name of a sufficiently ANSI C++ compliant +# compiler, or to "no" if none is found. +# Defines the Automake condition ANSICXX_CONDITIONAL to true if such a compiler +# was found, or to false if not. + +AC_DEFUN([gl_PROG_ANSI_CXX], +[ + AC_REQUIRE([gl_CXX_CHOICE]) + m4_if([$1], [CXX], [], + [gl_save_CXX="$CXX"]) + if test "$CXX_CHOICE" = no; then + CXX=no + fi + if test -z "$CXX"; then + if test -n "$CCC"; then + CXX="$CCC" + else + AC_CHECK_TOOLS([CXX], + [g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC], + [:]) + fi + fi + if test "$CXX" != no; then + dnl Use a modified version of AC_PROG_CXX_WORKS that does not exit + dnl upon failure. + AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works]) + AC_LANG_PUSH([C++]) + AC_ARG_VAR([CXX], [C++ compiler command]) + AC_ARG_VAR([CXXFLAGS], [C++ compiler flags]) + echo 'int main () { return 0; }' > conftest.$ac_ext + if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then + gl_cv_prog_ansicxx_works=yes + if (./conftest; exit) 2>/dev/null; then + gl_cv_prog_ansicxx_cross=no + else + gl_cv_prog_ansicxx_cross=yes + fi + else + gl_cv_prog_ansicxx_works=no + fi + rm -fr conftest* + AC_LANG_POP([C++]) + AC_MSG_RESULT([$gl_cv_prog_ansicxx_works]) + if test $gl_cv_prog_ansicxx_works = no; then + CXX=no + else + dnl Test for namespaces. + dnl We don't bother supporting pre-ANSI-C++ compilers. + AC_MSG_CHECKING([whether the C++ compiler supports namespaces]) + AC_LANG_PUSH([C++]) + cat <<EOF > conftest.$ac_ext +#include <iostream> +namespace test { using namespace std; } +std::ostream* ptr; +int main () { return 0; } +EOF + if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then + gl_cv_prog_ansicxx_namespaces=yes + else + gl_cv_prog_ansicxx_namespaces=no + fi + rm -fr conftest* + AC_LANG_POP([C++]) + AC_MSG_RESULT([$gl_cv_prog_ansicxx_namespaces]) + if test $gl_cv_prog_ansicxx_namespaces = no; then + CXX=no + fi + fi + fi + m4_if([$1], [CXX], [], + [$1="$CXX" + CXX="$gl_save_CXX"]) + AC_SUBST([$1]) + + AM_CONDITIONAL([$2], [test "$$1" != no]) + + if test "$$1" != no; then + dnl This macro invocation resolves an automake error: + dnl /usr/local/share/automake-1.11/am/depend2.am: am__fastdepCXX does not appear in AM_CONDITIONAL + dnl /usr/local/share/automake-1.11/am/depend2.am: The usual way to define 'am__fastdepCXX' is to add 'AC_PROG_CXX' + dnl /usr/local/share/automake-1.11/am/depend2.am: to 'configure.ac' and run 'aclocal' and 'autoconf' again. + _AM_DEPENDENCIES([CXX]) + else + AM_CONDITIONAL([am__fastdepCXX], [false]) + fi +]) |