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[build] Eliminate unused sections at link-time

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Use -ffunction-sections, -fdata-sections, and --gc-sections to
automatically prune out any unreferenced sections.

This saves around 744 bytes (uncompressed) from the rtl8139.rom build.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2011-02-22 19:36:24 +00:00
parent f3c72660a7
commit 623469de5d
6 changed files with 37 additions and 10 deletions
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13
src/Makefile.housekeeping
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@@ -415,6 +415,19 @@ CFLAGS += -finstrument-functions
CFLAGS += -finstrument-functions-exclude-file-list=core/fnrec.c
endif
# Enable per-item sections and section garbage collection. Note that
# some older versions of gcc support -fdata-sections but treat it as
# implying -fno-common, which would break our build.
#
ifeq ($(CCTYPE),gcc)
DS_TEST = $(ECHO) 'char x;' | \
$(CC) -fdata-sections -S -x c - -o - 2>/dev/null | \
grep -E '\.comm' > /dev/null
DS_FLAGS := $(shell $(DS_TEST) && $(ECHO) '-fdata-sections')
CFLAGS += -ffunction-sections $(DS_FLAGS)
endif
LDFLAGS += --gc-sections
# compiler.h is needed for our linking and debugging system
#
CFLAGS += -include compiler.h