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dnl Autoconf support for C++
dnl Copyright (C) 1988 Eleftherios Gkioulekas <lf@amath.washington.edu>
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 of the License, or
dnl (at your option) any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, write to the Free Software
dnl Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301, USA.
dnl
dnl As a special exception to the GNU General Public License, if you
dnl distribute this file as part of a program that contains a configuration
dnl script generated by Autoconf, you may include it under the same
dnl distribution terms that you use for the rest of that program.
# -----------------------------------------------------------------
# This macro should be called to configure your C++ compiler.
# When called, the macro does the following things:
# 1. It finds an appropriate C++ compiler
# If you passed the flag --with-cxx=foo, then it uses that
# particular compiler
# 2. Checks whether the compiler accepts the -g
# ------------------------------------------------------------------
AC_DEFUN([LF_CONFIGURE_CXX],[
AC_REQUIRE([AC_PROG_CXX])dnl
AC_REQUIRE([AC_PROG_CXXCPP])dnl
LF_CXX_PORTABILITY
])
# -----------------------------------------------------------------------
# This macro tests the C++ compiler for various portability problem.
# 1. Defines CXX_HAS_NO_BOOL if the compiler does not support the bool
# data type
# 2. Defines CXX_HAS_BUGGY_FOR_LOOPS if the compiler has buggy
# scoping for the for-loop
# 3. Defines USE_ASSERT if the user wants to use assertions
# -----------------------------------------------------------------------
AC_DEFUN([LF_CXX_PORTABILITY],[
dnl
dnl Check for common C++ portability problems
dnl
dnl AC_LANG_PUSH
dnl AC_LANG_CPLUSPLUS
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
dnl Check whether we have bool
AC_MSG_CHECKING(whether C++ has bool)
AC_TRY_RUN([main() { bool b1=true; bool b2=false; }],
[ AC_MSG_RESULT(yes) ],
[ AC_MSG_RESULT(no)
AC_DEFINE(CXX_HAS_NO_BOOL,[],[Define if C++ is missing bool type]) ],
[ AC_MSG_WARN(Don't cross-compile)]
)
dnl Test whether C++ has buggy for-loops
AC_MSG_CHECKING(whether C++ has buggy scoping in for-loops)
AC_TRY_COMPILE([#include <iostream.h>], [
for (int i=0;i<10;i++) { }
for (int i=0;i<10;i++) { }
], [ AC_MSG_RESULT(no) ],
[ AC_MSG_RESULT(yes)
AC_DEFINE(CXX_HAS_BUGGY_FOR_LOOPS,[],[Define if for loop scoping is broken]) ])
dnl Test whether the user wants to enable assertions
AC_MSG_CHECKING(whether user wants assertions)
AC_ARG_ENABLE(assert,
[ --disable-assert don't use cpp.h assert],
[ AC_DEFINE(NDEBUG,[],[Define to disable asserts (don't doit!)])
AC_MSG_RESULT(no) ],
[ AC_MSG_RESULT(yes) ],
)
dnl Test whether C++ has std::isnan
AC_MSG_CHECKING(whether C++ has std::isnan)
AC_TRY_COMPILE([#include <cmath>], [
std::isnan(0);
], [ AC_MSG_RESULT(yes)
AC_DEFINE(CXX_HAS_STD_ISNAN,[],[Define if has std::isnan]) ],
[ AC_MSG_RESULT(no) ])
dnl Done with the portability checks
dnl AC_LANG_POP([C++])
AC_LANG_RESTORE
])
AH_BOTTOM([// Workaround for compilers with buggy for-loop scoping
// That's quite a few compilers actually including recent versions of
// Dec Alpha cxx, HP-UX CC and SGI CC.
// The trivial "if" statement provides the correct scoping to the
// for loop
#ifdef CXX_HAS_BUGGY_FOR_LOOPS
#undef for
#define for if(1) for
#endif
])
AH_BOTTOM([// If the C++ compiler we use doesn't have bool, then
// the following is a near-perfect work-around.
// You must make sure your code does not depend on "int" and "bool"
// being two different types, in overloading for instance.
#ifdef CXX_HAS_NO_BOOL
#define bool int
#define true 1
#define false 0
#endif
])
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