external/icu: silence -Werror=deprecated-copy (GCC trunk towards GCC 9)

Change-Id: I43ecb3c0daac421e48433af04b1109bac02cc9aa
Reviewed-on: https://gerrit.libreoffice.org/58044
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

external/icu/UnpackedTarball_icu.mk

@@ -19,6 +19,8 @@ $(eval $(call gb_UnpackedTarball_set_pre_action,icu,\
 	unzip -q -d source -o $(gb_UnpackedTarget_TARFILE_LOCATION)/$(ICU_DATA_TARBALL) data/misc/icudata.rc \
 ))
 
+$(eval $(call gb_UnpackedTarball_set_patchlevel,icu,0))
+
 $(eval $(call gb_UnpackedTarball_add_patches,icu,\
 	external/icu/icu4c-build.patch.1 \
 	external/icu/icu4c-aix.patch.1 \
@@ -34,6 +36,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,icu,\
 	$(if $(filter-out ANDROID,$(OS)),external/icu/icu4c-icudata-stdlibs.patch.1) \
 	external/icu/icu4c-khmerbreakengine.patch.1 \
 	external/icu/icu4c-61-werror-shadow.patch.1 \
+	external/icu/gcc9.patch \
 ))
 
 $(eval $(call gb_UnpackedTarball_add_file,icu,source/data/brkitr/khmerdict.dict,external/icu/khmerdict.dict))

external/icu/gcc9.patch

+--- source/i18n/unicode/format.h
++++ source/i18n/unicode/format.h
+@@ -22,6 +22,13 @@
+ 
+ #ifndef FORMAT_H
+ #define FORMAT_H
++
++#ifdef __GNUC__
++#pragma GCC diagnostic push
++#pragma GCC diagnostic ignored "-Wpragmas" // for old GCC
++#pragma GCC diagnostic ignored "-Wunknown-warning-option" // for Clang
++#pragma GCC diagnostic ignored "-Wdeprecated-copy"
++#endif
+ 
+ 
+ #include "unicode/utypes.h"
+@@ -302,6 +309,10 @@
+ U_NAMESPACE_END
+ 
+ #endif /* #if !UCONFIG_NO_FORMATTING */
++
++#ifdef __GNUC__
++#pragma GCC diagnostic pop
++#endif
+ 
+ #endif // _FORMAT
+ //eof