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dnl This Source Code Form is subject to the terms of the Mozilla Public
dnl License, v. 2.0. If a copy of the MPL was not distributed with this
dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.

AC_DEFUN([MOZ_CONFIG_CLANG_PLUGIN], [

MOZ_ARG_ENABLE_BOOL(clang-plugin,
[  --enable-clang-plugin   Enable building with the mozilla clang plugin ],
   ENABLE_CLANG_PLUGIN=1,
   ENABLE_CLANG_PLUGIN= )
if test -n "$ENABLE_CLANG_PLUGIN"; then
    if test -z "${CLANG_CC}${CLANG_CL}"; then
        AC_MSG_ERROR([Can't use clang plugin without clang.])
    fi

    AC_MSG_CHECKING([for llvm-config])
    if test -z "$LLVMCONFIG"; then
      if test -n "$CLANG_CL"; then
          CXX_COMPILER="$(dirname "$CXX")/clang"
      else
          CXX_COMPILER="${CXX}"
      fi
      LLVMCONFIG=`$CXX_COMPILER -print-prog-name=llvm-config`
    fi

    if test -z "$LLVMCONFIG"; then
      LLVMCONFIG=`which llvm-config`
    fi

    if test ! -x "$LLVMCONFIG"; then
      AC_MSG_RESULT([not found])
      AC_MSG_ERROR([Cannot find an llvm-config binary for building a clang plugin])
    fi

    AC_MSG_RESULT([$LLVMCONFIG])

    if test -z "$LLVMCONFIG"; then
        AC_MSG_ERROR([Cannot find an llvm-config binary for building a clang plugin])
    fi
    dnl For some reason the llvm-config downloaded from clang.llvm.org for clang3_8
    dnl produces a -isysroot flag for a sysroot which might not ship when passed
    dnl --cxxflags. We use sed to remove this argument so that builds work on OSX
    LLVM_CXXFLAGS=`$LLVMCONFIG --cxxflags | sed -e 's/-isysroot [[^ ]]*//'`

    dnl We are loaded into clang, so we don't need to link to very many things,
    dnl we just need to link to clangASTMatchers because it is not used by clang
    LLVM_LDFLAGS=`$LLVMCONFIG --ldflags | tr '\n' ' '`

    if test "${HOST_OS_ARCH}" = "Darwin"; then
        dnl We need to make sure that we use the symbols coming from the clang
        dnl binary. In order to do this, we need to pass -flat_namespace and
        dnl -undefined suppress to the linker. This makes sure that we link the
        dnl symbols into the flat namespace provided by clang, and thus get
        dnl access to all of the symbols which are undefined in our dylib as we
        dnl are building it right now, and also that we don't fail the build
        dnl due to undefined symbols (which will be provided by clang).
        CLANG_LDFLAGS="-Wl,-flat_namespace -Wl,-undefined,suppress -lclangASTMatchers"
    elif test "${HOST_OS_ARCH}" = "WINNT"; then
        CLANG_LDFLAGS="clangASTMatchers.lib"
    else
        CLANG_LDFLAGS="-lclangASTMatchers"
    fi

    if test -n "$CLANG_CL"; then
        dnl The llvm-config coming with clang-cl may give us arguments in the
        dnl /ARG form, which in msys will be interpreted as a path name.  So we
        dnl need to split the args and convert the leading slashes that we find
        dnl into a dash.
        LLVM_REPLACE_CXXFLAGS=''
        for arg in $LLVM_CXXFLAGS; do
            dnl The following expression replaces a leading slash with a dash.
            dnl Also replace any backslashes with forward slash.
            arg=`echo "$arg"|sed -e 's/^\//-/' -e 's/\\\\/\//g'`
            LLVM_REPLACE_CXXFLAGS="$LLVM_REPLACE_CXXFLAGS $arg"
        done
        LLVM_CXXFLAGS="$LLVM_REPLACE_CXXFLAGS"

        LLVM_REPLACE_LDFLAGS=''
        for arg in $LLVM_LDFLAGS; do
            dnl The following expression replaces a leading slash with a dash.
            dnl Also replace any backslashes with forward slash.
            arg=`echo "$arg"|sed -e 's/^\//-/' -e 's/\\\\/\//g'`
            LLVM_REPLACE_LDFLAGS="$LLVM_REPLACE_LDFLAGS $arg"
        done
        LLVM_LDFLAGS="$LLVM_REPLACE_LDFLAGS"

        CLANG_REPLACE_LDFLAGS=''
        for arg in $CLANG_LDFLAGS; do
            dnl The following expression replaces a leading slash with a dash.
            dnl Also replace any backslashes with forward slash.
            arg=`echo "$arg"|sed -e 's/^\//-/' -e 's/\\\\/\//g'`
            CLANG_REPLACE_LDFLAGS="$CLANG_REPLACE_LDFLAGS $arg"
        done
        CLANG_LDFLAGS="$CLANG_REPLACE_LDFLAGS"
    fi

    dnl Check for the new ASTMatcher API names.  Since this happened in the
    dnl middle of the 3.8 cycle, our CLANG_VERSION_FULL is impossible to use
    dnl correctly, so we have to detect this at configure time.
    AC_CACHE_CHECK(for new ASTMatcher API,
                   ac_cv_have_new_ASTMatcher_api,
        [
            AC_LANG_SAVE
            AC_LANG_CPLUSPLUS
            _SAVE_CXXFLAGS="$CXXFLAGS"
            _SAVE_CXX="$CXX"
            _SAVE_MACOSX_DEPLOYMENT_TARGET="$MACOSX_DEPLOYMENT_TARGET"
            unset MACOSX_DEPLOYMENT_TARGET
            CXXFLAGS="${LLVM_CXXFLAGS}"
            CXX="${HOST_CXX}"
            AC_TRY_COMPILE([#include "clang/ASTMatchers/ASTMatchers.h"],
                           [clang::ast_matchers::cxxConstructExpr();],
                           ac_cv_have_new_ASTMatcher_names="yes",
                           ac_cv_have_new_ASTMatcher_names="no")
            CXX="$_SAVE_CXX"
            CXXFLAGS="$_SAVE_CXXFLAGS"
            export MACOSX_DEPLOYMENT_TARGET="$_SAVE_MACOSX_DEPLOYMENT_TARGET"
            AC_LANG_RESTORE
        ])
    if test "$ac_cv_have_new_ASTMatcher_names" = "yes"; then
      LLVM_CXXFLAGS="$LLVM_CXXFLAGS -DHAVE_NEW_ASTMATCHER_NAMES"
    fi

    dnl Check if we can compile has(ignoringParenImpCasts()) because
    dnl before 3.9 that ignoringParenImpCasts was done internally by "has".
    dnl See https://www.mail-archive.com/cfe-commits@lists.llvm.org/msg25234.html
    AC_CACHE_CHECK(for has with ignoringParenImpCasts,
                   ac_cv_has_accepts_ignoringParenImpCasts,
        [
            AC_LANG_SAVE
            AC_LANG_CPLUSPLUS
            _SAVE_CXXFLAGS="$CXXFLAGS"
            _SAVE_CXX="$CXX"
            _SAVE_MACOSX_DEPLOYMENT_TARGET="$MACOSX_DEPLOYMENT_TARGET"
            unset MACOSX_DEPLOYMENT_TARGET
            CXXFLAGS="${LLVM_CXXFLAGS}"
            CXX="${HOST_CXX}"
            AC_TRY_COMPILE([#include "clang/ASTMatchers/ASTMatchers.h"],
                           [using namespace clang::ast_matchers;
                            expr(has(ignoringParenImpCasts(declRefExpr())));
                           ],
                           ac_cv_has_accepts_ignoringParenImpCasts="yes",
                           ac_cv_has_accepts_ignoringParenImpCasts="no")
            CXX="$_SAVE_CXX"
            CXXFLAGS="$_SAVE_CXXFLAGS"
            export MACOSX_DEPLOYMENT_TARGET="$_SAVE_MACOSX_DEPLOYMENT_TARGET"
            AC_LANG_RESTORE
        ])
    if test "$ac_cv_has_accepts_ignoringParenImpCasts" = "yes"; then
      LLVM_CXXFLAGS="$LLVM_CXXFLAGS -DHAS_ACCEPTS_IGNORINGPARENIMPCASTS"
    fi

    AC_DEFINE(MOZ_CLANG_PLUGIN)
fi

AC_SUBST(LLVM_CXXFLAGS)
AC_SUBST(LLVM_LDFLAGS)
AC_SUBST(CLANG_LDFLAGS)

AC_SUBST(ENABLE_CLANG_PLUGIN)

])