mk: reduce PDF build commands

In case of documents without image, an empty rm command can be seen if V=1.
Remove it to avoid disturbing debugging.

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
Acked-by: Siobhan Butler <siobhan.a.butler@intel.com>

diff --git a/mk/rte.sdkdoc.mk b/mk/rte.sdkdoc.mk
index f91e079..9952f25 100644 (file)
--- a/mk/rte.sdkdoc.mk
+++ b/mk/rte.sdkdoc.mk
@@ -99,7 +99,7 @@ guides-pdf-%:
        $(Q)$(RTE_SPHINX_BUILD) -b latex $(RTE_SPHINX_VERBOSE) \
                -c $(RTE_SDK)/doc/guides $(RTE_SDK)/doc/guides/$* \
                $(RTE_OUTPUT)/doc/pdf/guides/$*
-       $(Q)rm -f $^
+       $(if $^,$(Q)rm -f $^)
        @echo 'pdflatex processing $@...'
        $(Q)$(MAKE) all-pdf -sC $(RTE_OUTPUT)/doc/pdf/guides/$* \
                LATEXOPTS=$(RTE_PDFLATEX_VERBOSE)