From the bug report:
"I'm seeing errors like this now:
/ws/dev1/open/src/java.base/share/native/libzip/zlib/inflate.c:766:25:
error: this statement may fall through [-Werror=implicit-fallthrough=]
state->mode = EXLEN;
It suspect it is related to the new gcc 7.3 devkit combined with
--with-zlib=bundled."
The patch belows disables the warning. It is needed twice, since not
only libzip but also libjli includes the bundleed zlib code.
Bug: https://bugs.openjdk.java.net/browse/JDK-8201349
Patch inline:
diff --git a/make/lib/CoreLibraries.gmk b/make/lib/CoreLibraries.gmk
--- a/make/lib/CoreLibraries.gmk
+++ b/make/lib/CoreLibraries.gmk
@@ -144,7 +144,7 @@
CFLAGS := $(CFLAGS_JDKLIB) \
$(LIBZ_CFLAGS), \
CFLAGS_unix := $(BUILD_LIBZIP_MMAP) -UDEBUG, \
- DISABLED_WARNINGS_gcc := unused-function, \
+ DISABLED_WARNINGS_gcc := unused-function implicit-fallthrough, \
LDFLAGS := $(LDFLAGS_JDKLIB) \
$(call SET_SHARED_LIBRARY_ORIGIN), \
LIBS_unix := -ljvm -ljava $(LIBZ_LIBS), \
@@ -210,7 +210,7 @@
EXTRA_FILES := $(LIBJLI_EXTRA_FILES), \
OPTIMIZATION := HIGH, \
CFLAGS := $(CFLAGS_JDKLIB) $(LIBJLI_CFLAGS), \
- DISABLED_WARNINGS_gcc := unused-function, \
+ DISABLED_WARNINGS_gcc := unused-function implicit-fallthrough, \
DISABLED_WARNINGS_clang := sometimes-uninitialized
format-nonliteral, \
LDFLAGS := $(LDFLAGS_JDKLIB) \
$(call SET_SHARED_LIBRARY_ORIGIN), \
/Magnus
