gcc4 generates a few link-time errors like:
drivers/sound/sounddrivers.o(.text+0x1d2): In function `sound_insert_unit':
: undefined reference to `strcpy'
drivers/sound/sounddrivers.o(.text+0x7b92): In function `emu10k1_find_control_gpr':
: undefined reference to `strcpy'
make: *** [vmlinux] Error 1
This is because gcc4 by default rewrites trivial forms of
sprintf to equivalent uses of strcpy. The problem is that
the kernel's strcpy is an inline function, so there is no
strcpy symbol available at link-time.
The easiest fix is to use -fno-builtin-sprintf which prevents
gcc from doing this rewrite. This also works with older gcc
versions (tested 2.95.3).
Signed-off-by: Mikael Pettersson <[email protected]>
Makefile | 1 +
1 files changed, 1 insertion(+)
diff -rupN linux-2.4.31/Makefile linux-2.4.31.gcc4-undefined-strcpy-errors/Makefile
--- linux-2.4.31/Makefile 2005-06-01 18:02:21.000000000 +0200
+++ linux-2.4.31.gcc4-undefined-strcpy-errors/Makefile 2005-06-12 11:45:03.000000000 +0200
@@ -93,6 +93,7 @@ CPPFLAGS := -D__KERNEL__ -I$(HPATH)
CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes -Wno-trigraphs -O2 \
-fno-strict-aliasing -fno-common
+CFLAGS += -fno-builtin-sprintf
ifndef CONFIG_FRAME_POINTER
CFLAGS += -fomit-frame-pointer
endif
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