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Editing: compiler-features.m4
dnl Copyright 2010 Google Inc. dnl All rights reserved. dnl dnl Redistribution and use in source and binary forms, with or without dnl modification, are permitted provided that the following conditions are dnl met: dnl dnl * Redistributions of source code must retain the above copyright dnl notice, this list of conditions and the following disclaimer. dnl * Redistributions in binary form must reproduce the above copyright dnl notice, this list of conditions and the following disclaimer in the dnl documentation and/or other materials provided with the distribution. dnl * Neither the name of Google Inc. nor the names of its contributors dnl may be used to endorse or promote products derived from this software dnl without specific prior written permission. dnl dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. dnl dnl KYUA_REQUIRE_CXX dnl dnl Ensures the C++ compiler detected by AC_PROG_CXX is present and works. dnl The compiler check should be performed here, but it seems like Autoconf dnl does not allow it. dnl AC_DEFUN([KYUA_REQUIRE_CXX], [ AC_CACHE_CHECK([whether the C++ compiler works], [atf_cv_prog_cxx_works], [AC_LANG_PUSH([C++]) AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [atf_cv_prog_cxx_works=yes], [atf_cv_prog_cxx_works=no]) AC_LANG_POP([C++])]) if test "${atf_cv_prog_cxx_works}" = no; then AC_MSG_ERROR([C++ compiler cannot create executables]) fi ]) dnl dnl KYUA_ATTRIBUTE_NORETURN dnl dnl Checks if the current compiler has a way to mark functions that do not dnl return and defines ATTRIBUTE_NORETURN to the appropriate string. dnl AC_DEFUN([KYUA_ATTRIBUTE_NORETURN], [ dnl This check is overly simple and should be fixed. For example, dnl Sun's cc does support the noreturn attribute but CC (the C++ dnl compiler) does not. And in that case, CC just raises a warning dnl during compilation, not an error. AC_MSG_CHECKING(whether __attribute__((noreturn)) is supported) AC_RUN_IFELSE([AC_LANG_PROGRAM([], [ #if ((__GNUC__ == 2 && __GNUC_MINOR__ >= 5) || __GNUC__ > 2) return 0; #else return 1; #endif ])], [AC_MSG_RESULT(yes) value="__attribute__((noreturn))"], [AC_MSG_RESULT(no) value=""] ) AC_SUBST([ATTRIBUTE_NORETURN], [${value}]) ]) dnl dnl KYUA_ATTRIBUTE_UNUSED dnl dnl Checks if the current compiler has a way to mark parameters as unused dnl so that the -Wunused-parameter warning can be avoided. dnl AC_DEFUN([KYUA_ATTRIBUTE_UNUSED], [ AC_MSG_CHECKING(whether __attribute__((__unused__)) is supported) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([ static void function(int a __attribute__((__unused__))) { }], [ function(3); return 0; ])], [AC_MSG_RESULT(yes) value="__attribute__((__unused__))"], [AC_MSG_RESULT(no) value=""] ) AC_SUBST([ATTRIBUTE_UNUSED], [${value}]) ])
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