[OE-core] [PATCH] gcc-target.inc: Remove non-related gcc headers from include_fixed folder

[leonardo.sandoval.gonzalez at linux.intel.com]

From: Leonardo Sandoval <leonardo.sandoval.gonzalez at linux.intel.com>

Without this patch, the D's include_fixed folder may change after building it
(due to the gcc's fixinc.sh script, executed on the do_compile task) and changes
depend on the current sysroot headers, making the gcc's builds non-deterministic.

[YOCTO #7882]

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez at linux.intel.com>
---
 meta/recipes-devtools/gcc/gcc-target.inc | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/meta/recipes-devtools/gcc/gcc-target.inc b/meta/recipes-devtools/gcc/gcc-target.inc
index 5d31446..1f91107 100644
--- a/meta/recipes-devtools/gcc/gcc-target.inc
+++ b/meta/recipes-devtools/gcc/gcc-target.inc
@@ -168,6 +168,37 @@ do_install () {
 	chown -R root:root ${D}
 }
 
+do_install_append () {
+        #
+        # Thefixinc.sh script, run on the gcc's compile phase, looks into sysroot header
+        # files and places the modified files into
+        # {D}${libdir}/gcc/${TARGET_SYS}/${BINV}/include-fixed folder. This makes the
+        # build not deterministic. The following code prunes all those headers
+        # except those under include-fixed/linux, *limits.h and README, yielding
+        # the same include-fixed folders no matter what sysroot
+
+        include_fixed="${D}${libdir}/gcc/${TARGET_SYS}/${BINV}/include-fixed"
+        for f in $(find ${include_fixed} -type f); do
+                case $f in
+                */include-fixed/linux/*)
+                    continue
+                    ;;
+                */include-fixed/*limits.h)
+                    continue
+                    ;;
+                */include-fixed/README)
+                    continue
+                    ;;
+                *)
+                    # remove file and directory if empty
+                    bbdebug 2 "Pruning $f"
+                    rm $f
+                    find $(dirname $f) -maxdepth 0 -empty -exec rmdir {} \;
+                    ;;
+                esac
+        done
+}
+
 # Installing /usr/lib/gcc/* means we'd have two copies, one from gcc-cross
 # and one from here. These can confuse gcc cross where includes use #include_next
 # and builds track file dependencies (e.g. perl and its makedepends code).
-- 
1.8.4.5