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-ffunction-sections
-fdata-sections

Place each function or data item into its own section in the output file if the target supports arbitrary sections.  The name of the function or the name of the data item determines the section's name in the output file.

Use these options on systems where the linker can perform optimizations to improve locality of reference in the instruction space.  Most systems using the ELF object format and SPARC processors running Solaris 2 have linkers with such optimizations.  AIX may have these optimizations in the future.

Only use these options when there are significant benefits from doing so.  When you specify these options, the assembler and linker will create larger object and executable files and will also be slower. You will not be able to use "gprof" on all systems if you specify this option and you may have problems with debugging if you specify both this option and -g.

Signed-off-by: Luigi 'Comio' Mantellini <luigi.mantellini at idf-hit.com>
---
 config.mk |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/config.mk b/config.mk
index c6d6f7b..591b490 100644
--- a/config.mk
+++ b/config.mk
@@ -23,6 +23,10 @@
 
 #########################################################################
 
+comma := ,
+empty :=
+space := $(empty) $(empty)
+
 ifneq ($(OBJTREE),$(SRCTREE))
 ifeq ($(CURDIR),$(SRCTREE))
 dir :=
@@ -97,6 +101,8 @@ HOSTCFLAGS	+= -pedantic
 #
 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 		> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
+ld-option = $(shell if $(CC) -Wl$(comma)$(1) -nostdlib -xc /dev/null -o /dev/null \
+		> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 
 #
 # Include the make variables (CC, etc...)
@@ -191,6 +197,13 @@ endif
 
 CFLAGS += $(call cc-option,-fno-stack-protector)
 
+# Create a section for each function or data (useful for sections garbage collector)
+CFLAGS += $(call cc-option,-ffunction-sections)
+CFLAGS += $(call cc-option,-fdata-sections)
+
+# Sections garbage collector
+LDFLAGS += $(call ld-option,--gc-sections)
+
 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 # option to the assembler.
 AFLAGS_DEBUG :=
-- 
1.7.3