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fix build with gcc -combine

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This commit is contained in:
Denis Vlasenko 2008-04-11 11:27:29 +00:00
parent 80f647c21c
commit 93b8263652
3 changed files with 40 additions and 6 deletions
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15
libbb/ptr_to_globals.c
View File

@ -5,7 +5,20 @@
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
struct globals;
#ifndef GCC_COMBINE
/* We cheat here. It is declared as const ptr in libbb.h,
* but here we make it live in R/W memory */
struct globals;
struct globals *ptr_to_globals;
#else
/* gcc -combine will see through and complain */
/* Using alternative method which is more likely to break
* on weird architectures, compilers, linkers and so on */
struct globals *const ptr_to_globals __attribute__ ((section (".data")));
#endif

14
scripts/Makefile.IMA
View File

@ -145,8 +145,10 @@ include libbb/Kbuild
lib-all-y += $(patsubst %,libbb/%,$(sort $(lib-y)))
lib-y:=
busybox: $(usage_stuff)
$(CC) $(CPPFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) --combine $(WHOLE_PROGRAM) \
busybox: $(usage_stuff) include/applet_tables.h
$(CC) $(CPPFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) \
-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
@ -154,7 +156,13 @@ busybox: $(usage_stuff)
-$(STRIP) -s -R .note -R .comment -R .version $@
applets/usage:
$(HOSTCC) -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -I$(srctree)/include -o applets/usage applets/usage.c
$(HOSTCC) -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -I$(srctree)/include -o applets/usage applets/usage.c
applets/applet_tables:
$(HOSTCC) -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -I$(srctree)/include -o applets/applet_tables applets/applet_tables.c
include/usage_compressed.h: $(srctree)/include/usage.h applets/usage
$(srctree)/applets/usage_compressed include/usage_compressed.h applets
include/applet_tables.h: $(srctree)/include/applets.h
applets/applet_tables include/applet_tables.h

17
shell/ash_ptr_hack.c
View File

@ -5,12 +5,25 @@
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
/* We cheat here. They are declared as const ptr in ash.c,
* but here we make them live in R/W memory */
struct globals_misc;
struct globals_memstack;
struct globals_var;
#ifndef GCC_COMBINE
/* We cheat here. They are declared as const ptr in ash.c,
* but here we make them live in R/W memory */
struct globals_misc *ash_ptr_to_globals_misc;
struct globals_memstack *ash_ptr_to_globals_memstack;
struct globals_var *ash_ptr_to_globals_var;
#else
/* gcc -combine will see through and complain */
/* Using alternative method which is more likely to break
* on weird architectures, compilers, linkers and so on */
struct globals_misc *const ash_ptr_to_globals_misc __attribute__ ((section (".data")));
struct globals_memstack *const ash_ptr_to_globals_memstack __attribute__ ((section (".data")));
struct globals_var *const ash_ptr_to_globals_var __attribute__ ((section (".data")));
#endif