prepare for openjdk-8 build infra re-use

index aa012ab..fc97295 100644
@@ -21,23 +21,6 @@ STAGING_DATADIR_JAVA_NATIVE ?= "${STAGING_DATADIR_NATIVE}/java"
 STAGING_LIBDIR_JNI_NATIVE ?= "${STAGING_LIBDIR_NATIVE}/jni"
 STAGING_LIBDIR_JVM_NATIVE ?= "${STAGING_LIBDIR_NATIVE}/jvm"
 
-# Icedtea's makefile is not compatible to parallelization so we cannot allow
-# passing a valid ${PARALLEL_MAKE} to it. OTOH OpenJDK's makefiles are
-# parallelizable and we need ${PARALLEL_MAKE} to derive the proper value.
-# The base for this quirk is that GNU Make only considers the last "-j" option.
-EXTRA_OEMAKE_remove_task-compile = "${PARALLEL_MAKE}"
-EXTRA_OEMAKE_remove_task-install = "${PARALLEL_MAKEINST}"
-
-# OpenJDK supports parallel compilation but uses a plain number for this.
-# In OE we have PARALLEL_MAKE which is the actual option passed to make,
-# e.g. "-j 4".
-def java_get_parallel_make(d):
-    pm = d.getVar('PARALLEL_MAKE', True);
-    if not pm or '-j' not in pm:
-        return 1
-
-    return pm.partition('-j')[2].strip().split(' ')[0]
-
 oe_jarinstall() {
   # Purpose: Install a jar file and create all the given symlinks to it.
   # Example:

new file mode 100644
index 0000000..785ddf0
@@ -0,0 +1,16 @@
+# Icedtea's makefile is not compatible to parallelization so we cannot allow
+# passing a valid ${PARALLEL_MAKE} to it. OTOH OpenJDK's makefiles are
+# parallelizable and we need ${PARALLEL_MAKE} to derive the proper value.
+# The base for this quirk is that GNU Make only considers the last "-j" option.
+EXTRA_OEMAKE_remove_task-compile = "${PARALLEL_MAKE}"
+EXTRA_OEMAKE_remove_task-install = "${PARALLEL_MAKEINST}"
+
+# OpenJDK supports parallel compilation but uses a plain number for this.
+# In OE we have PARALLEL_MAKE which is the actual option passed to make,
+# e.g. "-j 4".
+def openjdk_build_helper_get_parallel_make(d):
+    pm = d.getVar('PARALLEL_MAKE', True);
+    if not pm or '-j' not in pm:
+        return 1
+
+    return pm.partition('-j')[2].strip().split(' ')[0]

index 93463be..30fb24a 100644
@@ -25,6 +25,7 @@ CXXFLAGS_append = " -fno-tree-dse"
 CXX_append = " -std=gnu++98"
 
 inherit native java autotools pkgconfig
+inherit openjdk-build-helper
 
 JAVA_HOME[unexport] = "1"
 

@@ -58,7 +59,7 @@ export ALT_FREETYPE_LIB_PATH = "${STAGING_LIBDIR}"
 INSANE_SKIP_${PN} = "already-stripped"
 
 EXTRA_OECONF = "\
-	--with-parallel-jobs=${@java_get_parallel_make(d)} \
+	--with-parallel-jobs=${@openjdk_build_helper_get_parallel_make(d)} \
 	\
         --disable-tests \
         --disable-hotspot-tests \

index 1ac3154..0ef6758 100644
@@ -84,7 +84,7 @@ EXTRA_OECONF = " \
     --with-jdk-src-zip=${WORKDIR}/${JDK_FILE} \
     --with-langtools-src-zip=${WORKDIR}/${LANGTOOLS_FILE} \
     \
-    --with-parallel-jobs=${@java_get_parallel_make(d)} \
+    --with-parallel-jobs=${@openjdk_build_helper_get_parallel_make(d)} \
     \
     --with-pkgversion=${PV} \
     --with-cc-for-build=${BUILD_CC} \

index aaa4483..97bf6e1 100644
@@ -5,6 +5,7 @@ LICENSE  = "GPL-2.0-with-classpath-exception"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=3e0b59f8fac05c3c03d4a26bbda13f8f"
 
 inherit java autotools gettext qemu pkgconfig
+inherit openjdk-build-helper
 
 AUTOTOOLS_SCRIPT_PATH = "${S}/common/autoconf/"
 export AUTOCONF_DIR="${AUTOTOOLS_SCRIPT_PATH}"

index d0b2ec8..939155b 100644
@@ -52,7 +52,7 @@ SRC_URI_append = "\
 "
 
 EXTRA_OECONF_append = "\
-    --with-jobs=${@java_get_parallel_make(d)} \
+    --with-jobs=${@openjdk_build_helper_get_parallel_make(d)} \
     \
     --with-sys-root=${STAGING_DIR_HOST} \
     --with-tools-dir=${STAGING_DIR_NATIVE} \

index b782c32..e6f7933 100644
@@ -20,7 +20,7 @@ PACKAGECONFIG[png] = "--with-libpng=system,--with-libpng=bundled,libpng-native"
 PACKAGECONFIG[zlib] = "--with-zlib=system,--with-zlib=bundled,zlib-native"
 
 EXTRA_OECONF_append = "\
-    --with-jobs=${@java_get_parallel_make(d)} \
+    --with-jobs=${@openjdk_build_helper_get_parallel_make(d)} \
     \
     --with-sys-root=${STAGING_DIR_NATIVE} \
     --with-tools-dir=${STAGING_DIR_NATIVE} \

index 816b463..8aa04f5 100644
@@ -17,6 +17,7 @@ DEPENDS_append_libc-uclibc = " virtual/libiconv "
 DEPENDS_append = " qemu-native "
 
 inherit java autotools gettext qemu pkgconfig
+inherit openjdk-build-helper
 
 B = "${S}/build"
 

index 785ddf0..78906b0 100644
@@ -14,3 +14,38 @@ def openjdk_build_helper_get_parallel_make(d):
         return 1
 
     return pm.partition('-j')[2].strip().split(' ')[0]
+
+# All supported cross compilers support the compiler flags that were
+# added to make compilation with gcc6 work. But the host compiler for
+# native compilation is a different story: it may be too old (for example,
+# gcc 4.9.2 on Debian Wheezy). In that case we need to check what the
+# version is and only add the flags that are appropriate for that GCC
+# version.
+def openjdk_build_helper_get_cflags_by_cc_version(d, version):
+    if version.isdigit():
+        return d.getVar('FLAGS_GCC%d' % int(version)) or ''
+    return ''
+
+def openjdk_build_helper_get_build_cflags(d):
+    def get_build_cc_version(build_cc):
+        from subprocess import Popen, PIPE
+        cmd = d.expand('%s -dumpversion' % build_cc).split()
+        cc = Popen(cmd, stdout=PIPE, stderr=PIPE)
+        return cc.communicate()[0].decode('utf-8')[0]
+
+    build_cc = d.getVar('BUILD_CC')
+    version = get_build_cc_version(build_cc)
+    return openjdk_build_helper_get_cflags_by_cc_version(d, version)
+
+def openjdk_build_helper_get_target_cflags(d):
+    import re
+
+    # in the cross case, trust that GCCVERSION is correct. This won't
+    # work if the native toolchain is Clang, but as of this writing that
+    # doesn't work anyway.
+    version = d.getVar('GCCVERSION')[0]
+    # skip non digit characters at the beginning, e.g. from "linaro-6.2%"
+    match = re.search("\d", version)
+    if match:
+        version = version[match.start():]
+    return openjdk_build_helper_get_cflags_by_cc_version(d, version)

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