ax_llvm

Test for the existance of llvm, and make sure that it can be linked with the llvm-libs argument that is passed on to llvm-config i.e.:

   llvm --libs <llvm-libs>

llvm-config will also include any libraries that are depended apon.

AC_DEFUN([AX_LLVM],
[
AC_ARG_WITH([llvm],
        AS_HELP_STRING([--with-llvm@<:@=DIR@:>@], [use llvm (default is yes) - it is possible to specify the root directory for llvm (optional)]),
        [
    if test "$withval" = "no"; then
                want_llvm="no"
    elif test "$withval" = "yes"; then
        want_llvm="yes"
        ac_llvm_config_path=`which llvm-config`
    else
            want_llvm="yes"
        ac_llvm_config_path="$withval"
        fi
    ],
    [want_llvm="yes"])

        succeeded=no
        if test -z "$ac_llvm_config_path"; then
                ac_llvm_config_path=`which llvm-config`
        fi

        if test "x$want_llvm" = "xyes"; then
                if test -e "$ac_llvm_config_path"; then
                        LLVM_CPPFLAGS=`$ac_llvm_config_path --cxxflags`
                        LLVM_LDFLAGS="$($ac_llvm_config_path --ldflags) $($ac_llvm_config_path --libs $1)"

                        AC_REQUIRE([AC_PROG_CXX])
                        CPPFLAGS_SAVED="$CPPFLAGS"
                        CPPFLAGS="$CPPFLAGS $LLVM_CPPFLAGS"
                        export CPPFLAGS

                        LDFLAGS_SAVED="$LDFLAGS"
                        LDFLAGS="$LDFLAGS $LLVM_LDFLAGS"
                        export LDFLAGS

                        AC_CACHE_CHECK(can compile with and link with llvm([$1]),
                                                   ax_cv_llvm,
                [AC_LANG_PUSH([C++])
                                 AC_LINK_IFELSE(AC_LANG_PROGRAM([[@%:@include <llvm/Module.h>
                                                                                                        ]],
                                           [[llvm::Module *M = new llvm::Module("test"); return 0;]]),
                           ax_cv_llvm=yes, ax_cv_llvm=no)
                 AC_LANG_POP([C++])
                        ])

                        if test "x$ax_cv_llvm" = "xyes"; then
                                succeeded=yes
                        fi

                        CPPFLAGS="$CPPFLAGS_SAVED"
                LDFLAGS="$LDFLAGS_SAVED"
                else
                        succeeded=no
                fi
        fi

                if test "$succeeded" != "yes" ; then
                        AC_MSG_ERROR([[We could not detect the llvm libraries make sure that llvm-config is on your path or specified by --with-llvm.]])
                else
                        AC_SUBST(LLVM_CPPFLAGS)
                        AC_SUBST(LLVM_LDFLAGS)
                        AC_DEFINE(HAVE_LLVM,,[define if the llvm library is available])
                fi
])

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