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| author | Rob Landley <rob@landley.net> | 2006-08-29 21:46:10 +0000 |
|---|---|---|
| committer | Rob Landley <rob@landley.net> | 2006-08-29 21:46:10 +0000 |
| commit | 1fdd83f8979cff7875de53dfa3f99bd7d9ac838d (patch) | |
| tree | d9fbbaa0b81a5f3610a434caf96a51c58a02d031 | |
| parent | 31e2c00ec3eb10dc09585cb6d693920432069da5 (diff) | |
| download | busybox-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.mak | 7 |
1 files changed, 5 insertions, 2 deletions
@@ -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) |