1 files changed, 64 insertions, 0 deletions
diff --git a/odb/odb/gcc-fwd.hxx b/odb/odb/gcc-fwd.hxx
new file mode 100644
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--- /dev/null
+++ b/odb/odb/gcc-fwd.hxx
@@ -0,0 +1,64 @@
+// file      : odb/gcc-fwd.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_GCC_FWD_HXX
+#define ODB_GCC_FWD_HXX
+
+#if __GNUC__ >= 5
+#  if !__has_include(<bversion.h>)
+#    error GCC plugin headers are not installed
+#  endif
+#endif
+
+#include <bversion.h>
+
+#if BUILDING_GCC_MAJOR >= 6
+
+// If we include <system.h> here, it pulls in all kinds of GCC trouble that
+// "poisons" standard C/C++ declarations; see safe-ctype.h. So instead we
+// are going to "exclude" safe-ctype.h. To compensate, however, we will
+// include it first thing in gcc.hxx.
+//
+#  include <config.h>
+#  define SAFE_CTYPE_H
+#  include <system.h>
+#  undef SAFE_CTYPE_H
+#  include <coretypes.h>
+
+typedef unsigned int source_location; // <line-map.h>
+typedef source_location location_t;   // <input.h>
+
+#else // GCC < 6
+
+#if BUILDING_GCC_MAJOR > 4 || BUILDING_GCC_MAJOR == 4 && BUILDING_GCC_MINOR > 8
+#  include <limits.h> // CHAR_BIT
+#  include <config.h>
+#endif
+
+#if BUILDING_GCC_MAJOR >= 5
+#  include <stdint.h> // Needed by coretypes.h
+#endif
+
+extern "C"
+{
+// The hwint.h header uses gcc_checking_assert macro from system.h. But
+// if we include system.h here, it pulls in all kinds of GCC trouble that
+// "poisons" standard C/C++ declarations (see safe-ctype.h for an example).
+// Instead we are just going to provide the no-op definition of this macro.
+//
+#if BUILDING_GCC_MAJOR > 4 || BUILDING_GCC_MAJOR == 4 && BUILDING_GCC_MINOR > 8
+#  define gcc_checking_assert(expr) ((void)(0 & (expr)))
+#  include <hwint.h>
+#  undef gcc_checking_assert
+#endif
+
+#include <coretypes.h>
+
+typedef unsigned int source_location; // <line-map.h>
+typedef source_location location_t;   // <input.h>
+
+} // extern "C"
+
+#endif
+
+#endif // ODB_GCC_FWD_HXX