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authorRob Landley <rob@landley.net>2006-08-29 21:46:10 +0000
committerRob Landley <rob@landley.net>2006-08-29 21:46:10 +0000
commit1fdd83f8979cff7875de53dfa3f99bd7d9ac838d (patch)
treed9fbbaa0b81a5f3610a434caf96a51c58a02d031
parent31e2c00ec3eb10dc09585cb6d693920432069da5 (diff)
downloadbusybox-1fdd83f8979cff7875de53dfa3f99bd7d9ac838d.tar.gz
There's some strange bug in glibc that triggers if you combine the
--gc-sections linker flag with static linking. If this happens, then the "stdout" variable (used by printf() and such) will only work if stdout is _not_ redirected. I.E "./busybox" prints stuff, but "./busybox | cat" does not produce any output. (But even when redirected, "write(1,"blah",4);" continues to work just fine.) This is clearly a glibc bug, but to avoid triggering it I've moved the --gc-sections flag so it only gets added when we're not statically linking. If somebody would like to go poke Ulrich Drepper, you can trivially reproduce this with a "hello world" program, ala: gcc -static -Wl,--gc-sections hello.c && (./a.out | cat)
-rw-r--r--Rules.mak7
1 files changed, 5 insertions, 2 deletions
diff --git a/Rules.mak b/Rules.mak
index a99d42bef..e4ac81705 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -267,8 +267,6 @@ ifeq ($(strip $(CONFIG_DEBUG)),y)
CFLAGS +=-g
else
CFLAGS +=-DNDEBUG
- CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
- CHECKED_LDFLAGS += $(call check_ld,$(LD),--gc-sections,)
endif
ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
@@ -288,6 +286,11 @@ endif
STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
ifeq ($(strip $(CONFIG_STATIC)),y)
PROG_CFLAGS += $(call check_cc,$(CC),-static,)
+else
+ ifneq ($(strip $(CONFIG_DEBUG)),y)
+ CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
+ CHECKED_LDFLAGS += $(call check_ld,$(LD),--gc-sections,)
+ endif
endif
CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
LIB_CFLAGS+=$(CFLAGS_SHARED)