qt5-build.eclass: introduce qt_use_disable_config

Similar to qt_use_disable_mod, this function helps avoid automagic dependencies.

diff --git a/eclass/qt5-build.eclass b/eclass/qt5-build.eclass
index fee5775d9084af1eceec393982aa039afc3ea9d6..a627ce882a495ae45efc4ece8abc792ba4229745 100644 (file)
--- a/eclass/qt5-build.eclass
+++ b/eclass/qt5-build.eclass
@@ -370,6 +370,29 @@ qt_use_compile_test() {
        fi
 }
 
+# @FUNCTION: qt_use_disable_config
+# @USAGE: <flag> <config> <files...>
+# @DESCRIPTION:
+# <flag> is the name of a flag in IUSE.
+# <config> is the (lowercase) name of a Qt5 config entry.
+# <files...> is a list of one or more qmake project files.
+#
+# This function patches <files> to treat <config> as disabled
+# when <flag> is disabled, otherwise it does nothing.
+# This can be useful to avoid an automagic dependency when the config entry
+# is enabled on the system but the corresponding USE flag is disabled.
+qt_use_disable_config() {
+       [[ $# -ge 3 ]] || die "${FUNCNAME}() requires at least three arguments"
+
+       local flag=$1
+       local config=$2
+       shift 2
+
+       if ! use "${flag}"; then
+               echo "$@" | xargs sed -i -e "s/qtConfig(${config})/false/g" || die
+       fi
+}
+
 # @FUNCTION: qt_use_disable_mod
 # @USAGE: <flag> <module> <files...>
 # @DESCRIPTION: