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gnulib git, rev 4084b3a git://git.sv.gnu.org/gnulib.git gnulib git seems to be original source this stuff comes from. had to update because the existing m4 files had some incompatibility with latest gnu autotools when trying to build nano from git.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,62 +1,128 @@ | ||
| # ansi-c++.m4 serial 1 (gettext-0.12) | ||
| dnl Copyright (C) 2002-2003 Free Software Foundation, Inc. | ||
| # ansi-c++.m4 serial 9 | ||
| dnl Copyright (C) 2002-2003, 2005, 2010-2017 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 to the name of a sufficiently ANSI C++ compliant compiler, | ||
| # or to ":" if none is found. | ||
| # 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([gt_PROG_ANSI_CXX], | ||
| AC_DEFUN([gl_CXX_CHOICE], | ||
| [ | ||
| AC_CHECK_PROGS(CXX, $CCC g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC, :) | ||
| if test "$CXX" != ":"; 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$ac_exeext; then | ||
| ac_cv_prog_cxx_works=yes | ||
| if (./conftest; exit) 2>/dev/null; then | ||
| ac_cv_prog_cxx_cross=no | ||
| AC_MSG_CHECKING([whether to use C++]) | ||
| dnl Plus signs are supported in AC_ARG_ENABLE starting with autoconf-2.66. | ||
| m4_version_prereq([2.66], | ||
| [m4_ifdef([gl_CXX_CHOICE_DEFAULT_NO], | ||
| [AC_ARG_ENABLE([c++], | ||
| [ --enable-c++ also build C++ sources], | ||
| [CXX_CHOICE="$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_cv_prog_cxx_cross=yes | ||
| AC_CHECK_TOOLS([CXX], | ||
| [g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC], | ||
| [:]) | ||
| fi | ||
| else | ||
| ac_cv_prog_cxx_works=no | ||
| fi | ||
| rm -fr conftest* | ||
| AC_LANG_POP(C++) | ||
| AC_MSG_RESULT($ac_cv_prog_cxx_works) | ||
| if test $ac_cv_prog_cxx_works = no; then | ||
| CXX=: | ||
| else | ||
| dnl Test for namespaces. Both libasprintf and tests/lang-c++ need it. | ||
| dnl We don't bother supporting pre-ANSI-C++ compilers. | ||
| AC_MSG_CHECKING([whether the C++ compiler supports namespaces]) | ||
| AC_LANG_PUSH(C++) | ||
| cat <<EOF > conftest.$ac_ext | ||
| 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$ac_exeext; then | ||
| gt_cv_prog_cxx_namespaces=yes | ||
| else | ||
| gt_cv_prog_cxx_namespaces=no | ||
| fi | ||
| rm -fr conftest* | ||
| AC_LANG_POP(C++) | ||
| AC_MSG_RESULT($gt_cv_prog_cxx_namespaces) | ||
| if test $gt_cv_prog_cxx_namespaces = no; then | ||
| CXX=: | ||
| if AC_TRY_EVAL([ac_link]) && test -s conftest$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 | ||
| 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 | ||
| ]) |
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