kernel-2.eclass: Migrate CROSSCOMPILE_OPTS=headers-only -> USE=headers-only

CROSSCOMPILE_OPTS is a USE_EXPAND of a single item: headers-only.
Convert it to a global USE flag instead.

Mechanical ebuild rename done as:
    $ sed -e 's@crosscompile_opts_headers-only@headers-only@g' \
        -i $(git grep -l headers-only)

'headers-only' flag is used by crossdev to bootstrap stage1 compiler
before libc is available.

crossdev switched to USE=headers-only in =sys-devel/crossdev-20171230.

Bug: https://bugs.gentoo.org/642712
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

diff --git a/eclass/kernel-2.eclass b/eclass/kernel-2.eclass
index 018f48e710690c4e3363957645d2a7528f52a2d2..a42d5f5ec24bc2ae25196795a94cffb018aca29e 100644 (file)
--- a/eclass/kernel-2.eclass
+++ b/eclass/kernel-2.eclass
@@ -667,7 +667,7 @@ if [[ ${ETYPE} == sources ]]; then
 
 elif [[ ${ETYPE} == headers ]]; then
        DESCRIPTION="Linux system headers"
-       IUSE="crosscompile_opts_headers-only"
+       IUSE="headers-only"
 
        # Since we should NOT honour KBUILD_OUTPUT in headers
        # lets unset it here.
@@ -693,7 +693,7 @@ kernel_header_destdir() {
 # @DESCRIPTION:
 # set use if necessary for cross compile support
 cross_pre_c_headers() {
-       use crosscompile_opts_headers-only && [[ ${CHOST} != ${CTARGET} ]]
+       use headers-only && [[ ${CHOST} != ${CTARGET} ]]
 }
 
 # @FUNCTION: env_setup_xmakeopts