Makefile.IMA: generate autoconf.h if needed

Makefile.IMA: use ld -gc-collect on gc -combine result
 (by using trylink script). Saves ~3k.

1 files changed, 20 insertions, 5 deletions

diff --git a/scripts/Makefile.IMA b/scripts/Makefile.IMA
index 27163ab36..29399178e 100644
--- a/scripts/Makefile.IMA
+++ b/scripts/Makefile.IMA
@@ -146,21 +146,36 @@ lib-all-y += $(patsubst %,libbb/%,$(sort $(lib-y)))
 lib-y:=
 
 comma:=,
-busybox: $(usage_stuff) include/applet_tables.h
+busybox_unstripped.o: $(usage_stuff) include/applet_tables.h include/autoconf.h
         $(CC) $(CPPFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) \
                 $(patsubst %,-Wl$(comma)%,$(LDFLAGS) $(EXTRA_LDFLAGS)) \
                 -DGCC_COMBINE=1 \
                 --combine $(WHOLE_PROGRAM) \
                 -funit-at-a-time -Wno-error -std=gnu99  \
-                -o $(@)_unstripped $(lib-all-y:.o=.c) \
-                -Wl,--start-group -lcrypt -lm -Wl,--end-group
+                -c -o busybox_unstripped.o \
+                $(lib-all-y:.o=.c)
+
+busybox: busybox_unstripped.o
+        $(srctree)/scripts/trylink \
+                busybox_unstripped \
+                "$(CC)" \
+                "$(CFLAGS)" \
+                "$(LDFLAGS)" \
+                "busybox_unstripped.o" \
+                "" \
+                "crypt m"
         cp -f $(@)_unstripped $@
         -$(STRIP) -s -R .note -R .comment -R .version $@
 
-applets/usage:
+# If .config is newer than include/autoconf.h, someone tinkered
+# with it and forgot to run make oldconfig.
+include/autoconf.h: .config
+        $(MAKE) -f $(srctree)/Makefile silentoldconfig
+
+applets/usage: include/autoconf.h
         $(HOSTCC) -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -I$(srctree)/include -o applets/usage applets/usage.c
 
-applets/applet_tables:
+applets/applet_tables: include/autoconf.h
         $(HOSTCC) -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -I$(srctree)/include -o applets/applet_tables applets/applet_tables.c
 
 include/usage_compressed.h: $(srctree)/include/usage.h applets/usage