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path: root/src/m4/bitcoin_subdir_to_include.m4
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dnl BITCOIN_SUBDIR_TO_INCLUDE([CPPFLAGS-VARIABLE-NAME],[SUBDIRECTORY-NAME],[HEADER-FILE])
dnl SUBDIRECTORY-NAME must end with a path separator
AC_DEFUN([BITCOIN_SUBDIR_TO_INCLUDE],[
  if test "x$2" = "x"; then
    AC_MSG_RESULT([default])
  else
    echo "#include <$2$3.h>" >conftest.cpp
    newinclpath=`${CXXCPP} -M conftest.cpp 2>/dev/null | [ tr -d '\\n\\r\\\\' | sed -e 's/^.*[[:space:]:]\(\/[^[:space:]]*\)]$3[\.h[[:space:]].*$/\1/' -e t -e d`]
    AC_MSG_RESULT([${newinclpath}])
    eval "$1=\"\$$1\"' -I${newinclpath}'"
  fi
])