[oe] [meta-java][PATCH] openjdk-8: Enable HotSpot builds on 5.x Linux kernels

[Nicola Lunghi]

This is a backport of a patch to enable hotspot builds
with 5.x kernels.

Signed-off-by: Nicola Lunghi <nick83ola at gmail.com>
---
 .../openjdk-8-release-172b11-common.inc       |  1 +
 ...-HotSpot-builds-on-5.x-Linux-kernels.patch | 43 +++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 recipes-core/openjdk/patches-openjdk-8/0020-Enable-HotSpot-builds-on-5.x-Linux-kernels.patch

diff --git a/recipes-core/openjdk/openjdk-8-release-172b11-common.inc b/recipes-core/openjdk/openjdk-8-release-172b11-common.inc
index ad20585..a8d3ccb 100644
--- a/recipes-core/openjdk/openjdk-8-release-172b11-common.inc
+++ b/recipes-core/openjdk/openjdk-8-release-172b11-common.inc
@@ -29,6 +29,7 @@ HOTSPOT_UB_PATCH = "\
     file://0017-hotspot-Missing-return-statement-in-__sync_val_compa.patch \
     file://0018-hotspot-Fix-debug-build-after-8062808-Turn-on-the-Wr.patch \
     file://0019-hotspot-Turn-on-the-Wreturn-type-warning.patch \
+    file://0020-Enable-HotSpot-builds-on-5.x-Linux-kernels.patch \
 "
 HOTSPOT_UB_PATCH_prepend_aarch64 = "\
     file://0012-hotspot-aarch64-fix-undefined-behaviour-gcc-v8-fix.patch \
diff --git a/recipes-core/openjdk/patches-openjdk-8/0020-Enable-HotSpot-builds-on-5.x-Linux-kernels.patch b/recipes-core/openjdk/patches-openjdk-8/0020-Enable-HotSpot-builds-on-5.x-Linux-kernels.patch
new file mode 100644
index 0000000..f9feca0
--- /dev/null
+++ b/recipes-core/openjdk/patches-openjdk-8/0020-Enable-HotSpot-builds-on-5.x-Linux-kernels.patch
@@ -0,0 +1,43 @@
+From 90220d41f65910b108c901977eefe78fc1edecc5 Mon Sep 17 00:00:00 2001
+From: Nicola Lunghi <nicola.lunghi at jci.com>
+Date: Mon, 17 Jun 2019 13:59:26 +0100
+Subject: [PATCH] Enable HotSpot builds on 5.x Linux kernels
+
+8217753: Enable HotSpot builds on 5.x Linux kernels
+Summary: Remove Linux kernel version check as very unlikely a kernel older than 2.4 will be used.
+Reviewed-by: erikj
+
+Upstream-Status: Backport (http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/rev/5af8ec63c21c)
+---
+ hotspot/make/linux/Makefile | 15 +--------------
+ 1 file changed, 1 insertion(+), 14 deletions(-)
+
+diff --git a/hotspot/make/linux/Makefile b/hotspot/make/linux/Makefile
+index 17c14097..e8f20104 100644
+--- a/hotspot/make/linux/Makefile
++++ b/hotspot/make/linux/Makefile
+@@ -227,20 +227,7 @@ all:
+ 	@echo "  $(TARGETS_SHARK)"
+ 	@echo "  $(TARGETS_MINIMAL1)"
+ 
+-checks: check_os_version check_j2se_version
+-
+-# We do not want people accidentally building on old systems (e.g. Linux 2.2.x,
+-# Solaris 2.5.1, 2.6).
+-# Disable this check by setting DISABLE_HOTSPOT_OS_VERSION_CHECK=ok.
+-
+-SUPPORTED_OS_VERSION = 2.4% 2.5% 2.6% 3% 4%
+-OS_VERSION := $(shell uname -r)
+-EMPTY_IF_NOT_SUPPORTED = $(filter $(SUPPORTED_OS_VERSION),$(OS_VERSION))
+-
+-check_os_version:
+-ifeq ($(DISABLE_HOTSPOT_OS_VERSION_CHECK)$(EMPTY_IF_NOT_SUPPORTED),)
+-	$(QUIETLY) >&2 echo "*** This OS is not supported:" `uname -a`; exit 1;
+-endif
++checks: check_j2se_version
+ 
+ # jvmti.make requires XSLT (J2SE 1.4.x or newer):
+ XSLT_CHECK	= $(REMOTE) $(RUN.JAVAP) javax.xml.transform.TransformerFactory
+-- 
+2.20.1
+
-- 
2.20.1