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make/rules-source.mk: Suppress grep warnings.
The second grep in sequence can exit early (-q, as soon as we have one match it exits with a success) which makes the first grep unhappy as its write pipe is closed early, resulting in: syncing vulkan-loader... grep: write error: Broken pipe Let's silence those errors.
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@ -23,7 +23,7 @@ $$(OBJ)/.$(1)-source: SHELL := $$(SHELL)
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$$(OBJ)/.$(1)-source: $$(if $$(NO_MAKEFILE_DEPENDENCY),,$$(MAKEFILE_LIST))
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$$(OBJ)/.$(1)-source: $$(shell echo -n 'syncing $(1)... ' >&2 && \
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rsync --dry-run --filter=:C --exclude '*~' --exclude .git $$($(2)_SOURCE_ARGS) --info=name -Oarx --delete "$$(abspath $(3))/" "$$($(2)_SRC)" | \
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grep -v -e ^$$$$ | grep -q ^ && echo $(1)-rebuild && \
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grep -v -e ^$$$$ 2>/dev/null | grep -q ^ && echo $(1)-rebuild && \
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echo 'done, dirty' >&2 || echo 'done' >&2)
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rsync --filter=:C --exclude '*~' --exclude .git $$($(2)_SOURCE_ARGS) --info=name -Oarx --delete "$$(abspath $(3))/" "$$($(2)_SRC)" $(--quiet?)
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touch $$@
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