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target: Update LRU config mechanism #53

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Oct 5, 2023
Merged

target: Update LRU config mechanism #53

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28 changes: 19 additions & 9 deletions target/snitch_cluster/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -119,21 +119,31 @@ VLT_COBJ += $(VLT_BUILDDIR)/generated/bootdata.o

CLUSTER_GEN_PREREQ = ${CLUSTER_GEN} ${CLUSTER_GEN_SRC}

# This target is always evaluated and creates a symlink to the least
# recently used config file. Because it is a symlink, targets to which it is a
# prerequisite will only be updated if the symlink target is newer than the
# depending targets, regardless of the symlink timestamp itself. The symlink
# timestamp can be taken into account by using the `make -L` flag on the
# command-line, however for simplicity we touch the symlink targets so it can
# be used without.
$(CFG): FORCE
@# If the LRU config file doesn't exist, we use the default config.
@if [ ! -e $@ ] ; then \
DEFAULT_CFG="$(DEFAULT_CFG)"; \
echo "Using default config file: $$DEFAULT_CFG"; \
cp $$DEFAULT_CFG $@; \
@if [ ! -e "$@" ] ; then \
echo "Using default config file: $(DEFAULT_CFG) $@"; \
ln -s --relative $(DEFAULT_CFG) $@; \
touch $(DEFAULT_CFG); \
fi
@# If a config file is provided on the command-line and it differs
@# from the LRU config file then we override the LRU file with it
@# If a config file is provided on the command-line and the LRU
@# config file doesn't point to it already, then we make it point to it
@if [ $(CFG_OVERRIDE) ] ; then \
echo "Overriding config file with: $(CFG_OVERRIDE)"; \
if cmp -s $(CFG_OVERRIDE) $@ ; then \
echo "Override and LRU config files are equivalent. Nothing to be done."; \
target=$$(readlink -f $@); \
if [ "$$target" = "$(abspath $(CFG_OVERRIDE))" ] ; then \
echo "LRU config file already points to $(CFG_OVERRIDE). Nothing to be done."; \
else \
cp $(CFG_OVERRIDE) $@; \
rm -f $@; \
ln -s --relative $(CFG_OVERRIDE) $@; \
touch $(CFG_OVERRIDE); \
fi \
fi
FORCE:
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