111 lines
4.4 KiB
Plaintext
111 lines
4.4 KiB
Plaintext
dnl @synopsis AX_CXX_CHECK_LIB(libname, functioname, action-if, action-if-not)
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dnl
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dnl The standard AC_CHECK_LIB can not test functions in namespaces.
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dnl Therefore AC_CHECK_LIB(cgicc, cgicc::Cgicc::getVersion) will always
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dnl fail. We need to decompose the functionname into a series of namespaces
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dnl where it gets declared so that it can be used for a link test.
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dnl
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dnl In the first version I did allow namespace::functionname to be a
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dnl reference to a void-argument global functionname (just wrapped in a
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dnl namespace) like its C counterparts would be - but in reality such
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dnl thing does not exist. The only global / static functions are always
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dnl made const-functions which is an attribute mangled along into the
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dnl library function export name.
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dnl
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dnl The normal usage will ask for a test of a class-member function which
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dnl should be presented with a full function spec with arguments given in
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dnl parentheses following the function name - if the function to test for
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dnl does expect arguments then you should add default initial values in the
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dnl prototype (even if they do not exist originally, these are used only
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dnl locally to build a correct function call in the configure test script).
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dnl
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dnl In the current version if you do omit the parenthesis from the macro
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dnl argument then the macro will assume that you want to check for the
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dnl class name - which is really to check for default constructor being
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dnl exported from the given library name.
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dnl
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dnl EXAMPLE:
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dnl AX_CXX_CHECK_LIB(cgicc, [cgicc::HTTPCookie])
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dnl AX_CXX_CHECK_LIB(cgicc, [cgicc::Cgicc::getVersion () const],
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dnl AX_CXX_CHECK_LIB(boost_regex, [boost::RegEx::Position (int i = 0) const])
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dnl
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dnl Result:
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dnl Just as the usual AX_CXX_CHECK_LIB - defines HAVE_LIBCGICC
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dnl and adds the libraries to the default library path (and
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dnl uses internally the normal ac_check_lib cache symbol
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dnl like ac_cv_lib_cgicc_cgicc__Cgicc)
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dnl
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dnl Footnote: The C++ language is not good at creating stable library
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dnl interfaces at the binary level - a lot of functionality is usually being
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dnl given as inline functions plus there is hardly a chance to create opaque
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dnl types. Therefore most C++ library tests will only do compile tests using
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dnl the header files. Doing a check_lib is however good to check the link
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dnl dependency before hitting it as an error in the build later.
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dnl
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dnl @category C++
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dnl @author Guido U. Draheim
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dnl @vesion 2006-12-18
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AC_DEFUN([AX_CXX_CHECK_LIB],
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[m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl
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AS_LITERAL_IF([$1],
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[AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])],
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[AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2])])dnl
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AC_CACHE_CHECK([for $2 in -l$1], ac_Lib,
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[ac_check_lib_save_LIBS=$LIBS
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LIBS="-l$1 $5 $LIBS"
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case "$2"
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in *::*::*\(*)
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AC_LINK_IFELSE([AC_LANG_PROGRAM([
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namespace `echo "$2" | sed -e "s/::.*//"`
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{ class `echo "$2" | sed -e "s/.*::\\(.*\\)::.*/\\1/" -e "s/(.*//"`
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{ public: int `echo "$2" | sed -e "s/.*:://" -e "/(/!s/..*/&()/"`;
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};
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}
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],[`echo "$2" | sed -e "s/(.*//" -e "s/\\(.*\\)::\\(.*\\)/((\\1*)(0))->\\2/g"`()])],
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[AS_VAR_SET(ac_Lib, yes)],
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[AS_VAR_SET(ac_Lib, no)])
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;; *::*::*)
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AC_LINK_IFELSE([AC_LANG_PROGRAM([
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namespace `echo "$2" | sed -e "s/::.*//"`
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{ namespace `echo "$2" | sed -e "s/.*::\\(.*\\)::.*/\\1/"`
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{ class `echo "$2" | sed -e "s/.*:://"`
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{ public: `echo "$2" | sed -e "s/.*:://"` ();
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};
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}
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}
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],[new $2()])],
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[AS_VAR_SET(ac_Lib, yes)],
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[AS_VAR_SET(ac_Lib, no)])
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;; *::*\(*)
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AC_LINK_IFELSE([AC_LANG_PROGRAM([
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class `echo "$2" | sed -e "s/\\(.*\\)::.*/\\1/" -e "s/(.*//"`
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{ public: int `echo "$2" | sed -e "s/.*:://" -e "/(/!s/..*/&()/"`;
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};
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],[`echo "$2" | sed -e "s/(.*//" -e "s/\\(.*\\)::\\(.*\\)/((\\1*)(0))->\\2/g"`()])],
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[AS_VAR_SET(ac_Lib, yes)],
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[AS_VAR_SET(ac_Lib, no)])
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;; *::*)
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AC_LINK_IFELSE([AC_LANG_PROGRAM([
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namespace `echo "$2" | sed -e "s/::.*//"`
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{ class `echo "$2" | sed -e "s/.*:://"`
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{ public: `echo "$2" | sed -e "s/.*:://"` ();
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};
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}
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],[new $2()])],
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[AS_VAR_SET(ac_Lib, yes)],
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[AS_VAR_SET(ac_Lib, no)])
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;; *)
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AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
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[AS_VAR_SET(ac_Lib, yes)],
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[AS_VAR_SET(ac_Lib, no)])
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;; esac
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LIBS=$ac_check_lib_save_LIBS])
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AS_IF([test AS_VAR_GET(ac_Lib) = yes],
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[m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
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LIBS="-l$1 $LIBS"
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])],
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[$4])dnl
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AS_VAR_POPDEF([ac_Lib])dnl
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])# AC_CHECK_LIB
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