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