From a2dee162af41c80827ff60d87c08ea981b55b31b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 19 Mar 2013 15:02:31 +0200
Subject: Add support for installing plugin into default GCC plugin directory

---
 m4/gcc-plugin.m4 | 125 +++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 113 insertions(+), 12 deletions(-)

(limited to 'm4/gcc-plugin.m4')

diff --git a/m4/gcc-plugin.m4 b/m4/gcc-plugin.m4
index 27453a2..27ce15d 100644
--- a/m4/gcc-plugin.m4
+++ b/m4/gcc-plugin.m4
@@ -5,23 +5,124 @@ dnl
 dnl GCC_PLUGIN
 dnl
 AC_DEFUN([GCC_PLUGIN], [
-gcc_plugin_support=no
+static_plugin=$enable_static
 
-if test x"$GXX" != xyes; then
-  AC_MSG_ERROR([$CXX is not a GNU C++ compiler])
+AC_ARG_WITH(
+  [gcc-plugin-dir],
+  [AC_HELP_STRING([--with-gcc-plugin-dir=DIR], [install ODB plugin into the GCC plugin directory])],
+  [gcc_plugin_dir=$withval],
+  [gcc_plugin_dir=test])
+
+if test x"$static_plugin" = xyes; then
+  gcc_plugin_dir=no
+else
+  if test x"$cross_compiling" = xyes; then
+    AC_MSG_CHECKING([whether to install into default GCC plugin dir])
+    case $gcc_plugin_dir in
+       yes)
+         AC_MSG_ERROR([GCC plugin directory must be specified explicitly when cross-compiling])
+         ;;
+       test)
+         # We cannot detect the plugin directory since there is no way to
+         # run host GCC. So assume no.
+         #
+         gcc_plugin_dir=no
+         ;;
+       no)
+         ;;
+       *)
+         # Add the include/ subdirectory of the plugin dir to CPPFLAGS since
+         # the plugin headers are normally installed there.
+         #
+         CPPFLAGS="$CPPFLAGS -I$gcc_plugin_dir/include"
+         ;;
+    esac
+  else
+    if test x"$GXX" != xyes; then
+      AC_MSG_ERROR([$CXX is not a GNU C++ compiler])
+    fi
+
+    AC_MSG_CHECKING([whether $CXX supports plugins])
+    dir=`$CXX -print-file-name=plugin 2>/dev/null`
+
+    if test x"$dir" = xplugin; then
+      AC_MSG_RESULT([no])
+      AC_MSG_ERROR([$CXX does not support plugins; reconfigure GCC with --enable-plugin])
+    else
+      AC_MSG_RESULT([yes])
+    fi
+
+    CPPFLAGS="$CPPFLAGS -I$dir/include"
+
+    AC_MSG_CHECKING([whether to install ODB plugin into default GCC plugin directory])
+    case $gcc_plugin_dir in
+       yes)
+         gcc_plugin_dir=$dir
+         ;;
+       test)
+         # Only install into the GCC plugin dir if both GCC and ODB are
+         # installed into the same prefix. Testing whether $libdir or
+         # $libexecdir is a prefix of the GCC plugin dir is a good
+         # approximation.
+         #
+
+         # Get the expanded values for libdir and libexecdir.
+         #
+         if test x$exec_prefix = xNONE; then
+           if test x$prefix = xNONE; then
+             e_exec_prefix=$ac_default_prefix
+           else
+             e_exec_prefix=$prefix
+           fi
+         else
+           e_exec_prefix=$exec_prefix
+         fi
+
+         e_libdir=`echo "$libdir" | sed "s?^\\\${exec_prefix}?$e_exec_prefix?"`
+         e_libexecdir=`echo "$libexecdir" | sed "s?^\\\${exec_prefix}?$e_exec_prefix?"`
+
+         # See if either one of them is a prefix of the plugin dir.
+         #
+         ld_suffix=`echo "$dir" | sed "s?^$e_libdir/*??"`
+         led_suffix=`echo "$dir" | sed "s?^$e_libexecdir/*??"`
+
+         if test x$ld_suffix != x$dir -o x$led_suffix != x$dir; then
+           gcc_plugin_dir=$dir
+         else
+           gcc_plugin_dir=no
+         fi
+         ;;
+       *)
+         ;;
+    esac
+  fi
+
+  if test x"$gcc_plugin_dir" != xno; then
+    AC_MSG_RESULT([yes])
+  else
+    AC_MSG_RESULT([no])
+  fi
 fi
 
-AC_MSG_CHECKING([whether $CXX supports plugins])
+AC_MSG_CHECKING([for GCC plugin headers])
 
-gcc_plugin_base=`$CXX -print-file-name=plugin 2>/dev/null`
+CXX_LIBTOOL_LINK_IFELSE([
+AC_LANG_SOURCE([
+#include <bversion.h>
 
-if test x"$gcc_plugin_base" = xplugin; then
-  AC_MSG_RESULT([no])
-  AC_MSG_ERROR([$CXX does not support plugins; reconfigure GCC with --enable-plugin or install plugin headers])
-else
+#ifndef BUILDING_GCC_MAJOR
+#  error no BUILDING_GCC_MAJOR in bversion.h
+#endif
+
+int main () {}
+])],
+[gcc_plugin_headers=yes],
+[gcc_plugin_headers=no])
+
+if test x"$gcc_plugin_headers" = xyes; then
   AC_MSG_RESULT([yes])
-  gcc_plugin_support=yes
+else
+  AC_MSG_RESULT([no])
+  AC_MSG_ERROR([GCC plugin headers not found; consider installing GCC plugin development package])
 fi
-
-CPPFLAGS="$CPPFLAGS -I$gcc_plugin_base/include"
 ])dnl
-- 
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