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Diffstat (limited to 'contrib/lutok/m4/compiler-features.m4')
| -rw-r--r-- | contrib/lutok/m4/compiler-features.m4 | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/contrib/lutok/m4/compiler-features.m4 b/contrib/lutok/m4/compiler-features.m4 new file mode 100644 index 000000000000..55ff4f42b261 --- /dev/null +++ b/contrib/lutok/m4/compiler-features.m4 @@ -0,0 +1,100 @@ +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}]) +]) |