bitbake/gcc: Enable a shared common source tree

This patch is a quick proof of concept to show how source code could
be shared between recipes which use ${B} to have a separate build
directory compared to source directory ${S}.

Issues:

a) gcc uses sed and creates config files against ${S} which means
the directory should not be shared. Need to change the way that works.

b) Could be extended to cover eglibc except there is a patch applied
against nativesdk versions which again makes the source incompatible.

c) Need to clean up the layout in work-shared and make a directory level deeper
to ensure patch separation.

d) clean task does not remove stamps

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-common.inc b/meta/recipes-devtools/gcc/gcc-common.inc
index a3fa234422..4d378339ab 100644
--- a/meta/recipes-devtools/gcc/gcc-common.inc
+++ b/meta/recipes-devtools/gcc/gcc-common.inc
@@ -37,8 +37,16 @@ ${GNU_MIRROR}/gcc/	http://gcc.get-software.com/releases/ \n \
 #
 gcclibdir = "${libdir}/gcc"
 BINV = "${PV}"
-S = "${WORKDIR}/gcc-${PV}"
-B = "${S}/build.${HOST_SYS}.${TARGET_SYS}"
+#S = "${WORKDIR}/gcc-${PV}"
+S = "${TMPDIR}/work-shared/gcc-${PV}"
+B = "${WORKDIR}/gcc-${PV}/build.${HOST_SYS}.${TARGET_SYS}"
+
+do_fetch[stamp-base] = "${TMPDIR}/stamps/work-shared/gcc-${PV}"
+do_unpack[stamp-base] = "${TMPDIR}/stamps/work-shared/gcc-${PV}"
+do_patch[stamp-base] = "${TMPDIR}/stamps/work-shared/gcc-${PV}"
+
+WORKDIR_task-unpack = "${TMPDIR}/work-shared/"
+WORKDIR_task-patch = "${TMPDIR}/work-shared/"
 
 target_includedir ?= "${includedir}"
 target_libdir ?= "${libdir}"