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Use -ffunction-sections to build smaller binaries #8658

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d7a7e1c
Makefile: improve print-binary-sizes to be more meaningful.
rustyrussell Nov 4, 2025
38635c0
Build: add function sections.
rustyrussell Nov 4, 2025
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11 changes: 6 additions & 5 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -290,9 +290,9 @@ ifeq ($(STATIC),1)
# For MacOS, Jacob Rapoport <jacob@rumblemonkey.com> changed this to:
# -L/usr/local/lib -lsqlite3 -lz -Wl,-lm -lpthread -ldl $(COVFLAGS)
# But that doesn't static link.
LDLIBS = -L$(CPATH) -Wl,-dn $(SQLITE3_LDLIBS) -Wl,-dy -lm -lpthread -ldl $(COVFLAGS)
LDLIBS = -L$(CPATH) -Wl,-dn $(SQLITE3_LDLIBS) -Wl,-dy -lm -lpthread -ldl $(COVFLAGS) -Wl,--gc-sections
else
LDLIBS = -L$(CPATH) -lm $(SQLITE3_LDLIBS) $(COVFLAGS)
LDLIBS = -L$(CPATH) -lm $(SQLITE3_LDLIBS) $(COVFLAGS) -Wl,--gc-sections
endif

# If we have the postgres client library we need to link against it as well
Expand Down Expand Up @@ -1107,6 +1107,7 @@ ccan-rune-coding.o: $(CCANDIR)/ccan/rune/coding.c
@$(call VERBOSE, "cc $<", $(CC) $(CFLAGS) -c -o $@ $<)

print-binary-sizes: $(ALL_PROGRAMS) $(ALL_TEST_PROGRAMS)
@find $(ALL_PROGRAMS) $(ALL_TEST_PROGRAMS) -printf '%p\t%s\n'
@echo 'Total program size: '`find $(ALL_PROGRAMS) -printf '%s\n' | awk '{TOTAL+= $$1} END {print TOTAL}'`
@echo 'Total tests size: '`find $(ALL_TEST_PROGRAMS) -printf '%s\n' | awk '{TOTAL+= $$1} END {print TOTAL}'`
@echo User programs:
@size -t $(PKGLIBEXEC_PROGRAMS) $(filter-out tools/reckless,$(BIN_PROGRAMS)) $(PLUGINS)
@echo All programs:
@size -t $(ALL_PROGRAMS) $(ALL_TEST_PROGRAMS) | tail -n1
3 changes: 2 additions & 1 deletion configure
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Expand Up @@ -46,8 +46,9 @@ usage_with_default()
# Given DEBUGBUILD, what COPTFLAGS do we default to.
default_coptflags()
{
printf "%s" "-ffunction-sections"
if [ "$1" = 0 ]; then
echo "-Og"
echo " -Og"
fi
}

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