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Diffstat (limited to 'm4/misc.m4')
| -rw-r--r-- | m4/misc.m4 | 110 |
1 files changed, 110 insertions, 0 deletions
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 |