. ./redoconf.rc
rc_include rc/CXX.rc

base="${1#rc/}"
src="${base%.hpp.precompiled.rc}"

# Check whether the compiler supports forcing
# the language type.  Some versions of gcc
# need this in order to precompile headers
# named *.hpp.
x="-x${NL}c++-header"
if (appendln CXXFLAGS "$x" && rc_compile cxx nolink); then
	rc_appendln CXXFLAGS_PCH_LANG "$x"
fi

# The existence of the specific gcc warning about
# precompiled headers is a pretty good indicator
# that they are supported in the way we expect.
rc_appendln CXXFLAGS "-Winvalid-pch"
if rc_compile cxx nolink; then
    rc_appendln CXXFLAGS_PCH "-include$NL$src.hpp"
    rc_appendln CXXFLAGS_PCH_FPIC "-include$NL$src.hpp.fpic"

    rc_appendln PRE_CXX_TARGETS "$src.hpp.gch"
    rc_appendln PRE_CXX_TARGETS_FPIC "$src.hpp.fpic.gch"
    rc_save
else
    echo "Precompiled C++ headers not supported." >&2
    rc_undo
fi