diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/ax_cxx_compile_stdcxx_11.m4 | 140 | ||||
| -rw-r--r-- | m4/misc.m4 | 110 |
2 files changed, 250 insertions, 0 deletions
diff --git a/m4/ax_cxx_compile_stdcxx_11.m4 b/m4/ax_cxx_compile_stdcxx_11.m4 new file mode 100644 index 00000000..f6cf4a15 --- /dev/null +++ b/m4/ax_cxx_compile_stdcxx_11.m4 @@ -0,0 +1,140 @@ +# ============================================================================ +# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html +# ============================================================================ +# +# SYNOPSIS +# +# AX_CXX_COMPILE_STDCXX_11([ext|noext],[mandatory|optional]) +# +# DESCRIPTION +# +# Check for baseline language coverage in the compiler for the C++11 +# standard; if necessary, add switches to CXXFLAGS to enable support. +# +# The first argument, if specified, indicates whether you insist on an +# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g. +# -std=c++11). If neither is specified, you get whatever works, with +# preference for an extended mode. +# +# The second argument, if specified 'mandatory' or if left unspecified, +# indicates that baseline C++11 support is required and that the macro +# should error out if no mode with that support is found. If specified +# 'optional', then configuration proceeds regardless, after defining +# HAVE_CXX11 if and only if a supporting mode is found. +# +# LICENSE +# +# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com> +# Copyright (c) 2012 Zack Weinberg <zackw@panix.com> +# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu> +# +# Copying and distribution of this file, with or without modification, are +# permitted in any medium without royalty provided the copyright notice +# and this notice are preserved. This file is offered as-is, without any +# warranty. + +#serial 3 + +m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [ + template <typename T> + struct check + { + static_assert(sizeof(int) <= sizeof(T), "not big enough"); + }; + + typedef check<check<bool>> right_angle_brackets; + + int a; + decltype(a) b; + + typedef check<int> check_type; + check_type c; + check_type&& cr = static_cast<check_type&&>(c); + + auto d = a; +]) + +AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl + m4_if([$1], [], [], + [$1], [ext], [], + [$1], [noext], [], + [m4_fatal([invalid argument `$1' to AX_CXX_COMPILE_STDCXX_11])])dnl + m4_if([$2], [], [ax_cxx_compile_cxx11_required=true], + [$2], [mandatory], [ax_cxx_compile_cxx11_required=true], + [$2], [optional], [ax_cxx_compile_cxx11_required=false], + [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX_11])])dnl + AC_LANG_PUSH([C++])dnl + ac_success=no + AC_CACHE_CHECK(whether $CXX supports C++11 features by default, + ax_cv_cxx_compile_cxx11, + [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])], + [ax_cv_cxx_compile_cxx11=yes], + [ax_cv_cxx_compile_cxx11=no])]) + if test x$ax_cv_cxx_compile_cxx11 = xyes; then + ac_success=yes + fi + + restore_it="$CXXFLAGS" + m4_if([$1], [noext], [], [dnl + if test x$ac_success = xno; then + for switch in -std=gnu++11 -std=gnu++0x; do + cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch]) + AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch, + $cachevar, + [ac_save_CXXFLAGS="$CXXFLAGS" + CXXFLAGS="$CXXFLAGS $switch" + AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])], + [eval $cachevar=yes], + [eval $cachevar=no]) + CXXFLAGS="$ac_save_CXXFLAGS"]) + if eval test x\$$cachevar = xyes; then + CXXFLAGS="$CXXFLAGS" + c11switch="$switch" + ac_success=yes + break + fi + done + fi]) + + m4_if([$1], [ext], [], [dnl + if test x$ac_success = xno; then + for switch in -std=c++11 -std=c++0x; do + cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch]) + AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch, + $cachevar, + [ac_save_CXXFLAGS="$CXXFLAGS" + CXXFLAGS="$CXXFLAGS $switch" + AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])], + [eval $cachevar=yes], + [eval $cachevar=no]) + CXXFLAGS="$ac_save_CXXFLAGS"]) + if eval test x\$$cachevar = xyes; then + CXXFLAGS="$CXXFLAGS" + c11switch="$switch" + ac_success=yes + break + fi + done + fi]) + CXXFLAGS="$restore_it" + AC_SUBST([CXX11_SWITCH], ["$c11switch"]) + AC_LANG_POP([C++]) + if test x$ax_cxx_compile_cxx11_required = xtrue; then + if test x$ac_success = xno; then + AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.]) + fi + else + if test x$ac_success = xno; then + HAVE_CXX11=0 + AC_MSG_NOTICE([No compiler with C++11 support was found]) + else + HAVE_CXX11=1 + AC_DEFINE(HAVE_CXX11,1, + [define if the compiler supports basic C++11 syntax]) + fi + AM_CONDITIONAL([HAVE_CXX11],[test "x$HAVE_CXX11" = "x1"]) + + AC_SUBST(HAVE_CXX11) + fi +]) + diff --git a/m4/misc.m4 b/m4/misc.m4 new file mode 100644 index 00000000..d4aab47b --- /dev/null +++ b/m4/misc.m4 @@ -0,0 +1,110 @@ +dnl @synopsis AX_CXX_CHECK_LIB(libname, functioname, action-if, action-if-not) +dnl +dnl The standard AC_CHECK_LIB can not test functions in namespaces. +dnl Therefore AC_CHECK_LIB(cgicc, cgicc::Cgicc::getVersion) will always +dnl fail. We need to decompose the functionname into a series of namespaces +dnl where it gets declared so that it can be used for a link test. +dnl +dnl In the first version I did allow namespace::functionname to be a +dnl reference to a void-argument global functionname (just wrapped in a +dnl namespace) like its C counterparts would be - but in reality such +dnl thing does not exist. The only global / static functions are always +dnl made const-functions which is an attribute mangled along into the +dnl library function export name. +dnl +dnl The normal usage will ask for a test of a class-member function which +dnl should be presented with a full function spec with arguments given in +dnl parentheses following the function name - if the function to test for +dnl does expect arguments then you should add default initial values in the +dnl prototype (even if they do not exist originally, these are used only +dnl locally to build a correct function call in the configure test script). +dnl +dnl In the current version if you do omit the parenthesis from the macro +dnl argument then the macro will assume that you want to check for the +dnl class name - which is really to check for default constructor being +dnl exported from the given library name. +dnl +dnl EXAMPLE: +dnl AX_CXX_CHECK_LIB(cgicc, [cgicc::HTTPCookie]) +dnl AX_CXX_CHECK_LIB(cgicc, [cgicc::Cgicc::getVersion () const], +dnl AX_CXX_CHECK_LIB(boost_regex, [boost::RegEx::Position (int i = 0) const]) +dnl +dnl Result: +dnl Just as the usual AX_CXX_CHECK_LIB - defines HAVE_LIBCGICC +dnl and adds the libraries to the default library path (and +dnl uses internally the normal ac_check_lib cache symbol +dnl like ac_cv_lib_cgicc_cgicc__Cgicc) +dnl +dnl Footnote: The C++ language is not good at creating stable library +dnl interfaces at the binary level - a lot of functionality is usually being +dnl given as inline functions plus there is hardly a chance to create opaque +dnl types. Therefore most C++ library tests will only do compile tests using +dnl the header files. Doing a check_lib is however good to check the link +dnl dependency before hitting it as an error in the build later. +dnl +dnl @category C++ +dnl @author Guido U. Draheim +dnl @vesion 2006-12-18 + +AC_DEFUN([AX_CXX_CHECK_LIB], +[m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl +AS_LITERAL_IF([$1], + [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])], + [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2])])dnl +AC_CACHE_CHECK([for $2 in -l$1], ac_Lib, +[ac_check_lib_save_LIBS=$LIBS +LIBS="-l$1 $5 $LIBS" +case "$2" +in *::*::*\(*) +AC_LINK_IFELSE([AC_LANG_PROGRAM([ + namespace `echo "$2" | sed -e "s/::.*//"` + { class `echo "$2" | sed -e "s/.*::\\(.*\\)::.*/\\1/" -e "s/(.*//"` + { public: int `echo "$2" | sed -e "s/.*:://" -e "/(/!s/..*/&()/"`; + }; + } +],[`echo "$2" | sed -e "s/(.*//" -e "s/\\(.*\\)::\\(.*\\)/((\\1*)(0))->\\2/g"`()])], + [AS_VAR_SET(ac_Lib, yes)], + [AS_VAR_SET(ac_Lib, no)]) +;; *::*::*) +AC_LINK_IFELSE([AC_LANG_PROGRAM([ + namespace `echo "$2" | sed -e "s/::.*//"` + { namespace `echo "$2" | sed -e "s/.*::\\(.*\\)::.*/\\1/"` + { class `echo "$2" | sed -e "s/.*:://"` + { public: `echo "$2" | sed -e "s/.*:://"` (); + }; + } + } +],[new $2()])], + [AS_VAR_SET(ac_Lib, yes)], + [AS_VAR_SET(ac_Lib, no)]) +;; *::*\(*) +AC_LINK_IFELSE([AC_LANG_PROGRAM([ + class `echo "$2" | sed -e "s/\\(.*\\)::.*/\\1/" -e "s/(.*//"` + { public: int `echo "$2" | sed -e "s/.*:://" -e "/(/!s/..*/&()/"`; + }; +],[`echo "$2" | sed -e "s/(.*//" -e "s/\\(.*\\)::\\(.*\\)/((\\1*)(0))->\\2/g"`()])], + [AS_VAR_SET(ac_Lib, yes)], + [AS_VAR_SET(ac_Lib, no)]) +;; *::*) +AC_LINK_IFELSE([AC_LANG_PROGRAM([ + namespace `echo "$2" | sed -e "s/::.*//"` + { class `echo "$2" | sed -e "s/.*:://"` + { public: `echo "$2" | sed -e "s/.*:://"` (); + }; + } +],[new $2()])], + [AS_VAR_SET(ac_Lib, yes)], + [AS_VAR_SET(ac_Lib, no)]) +;; *) +AC_LINK_IFELSE([AC_LANG_CALL([], [$2])], + [AS_VAR_SET(ac_Lib, yes)], + [AS_VAR_SET(ac_Lib, no)]) +;; esac +LIBS=$ac_check_lib_save_LIBS]) +AS_IF([test AS_VAR_GET(ac_Lib) = yes], + [m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1)) + LIBS="-l$1 $LIBS" +])], + [$4])dnl +AS_VAR_POPDEF([ac_Lib])dnl +])# AC_CHECK_LIB |