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[PATCH] uml: comments about libc-conflict guards
While fixing myself the mktime conflict (which someone already merged), I also improved a few comments. Merge them up. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -47,13 +47,16 @@ ARCH_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include
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endif
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SYS_DIR := $(ARCH_DIR)/include/sysdep-$(SUBARCH)
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# -Dvmap=kernel_vmap affects everything, and prevents anything from
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# referencing the libpcap.o symbol so named.
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# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
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# named - it's a common symbol in libpcap, so we get a binary which crashes.
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#
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# Same things for in6addr_loopback - found in libc.
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# Same things for in6addr_loopback and mktime - found in libc. For these two we
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# only get link-time error, luckily.
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#
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# These apply to USER_CFLAGS to.
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CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
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$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
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CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
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$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
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-Din6addr_loopback=kernel_in6addr_loopback
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AFLAGS += $(ARCH_INCLUDE)
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@ -66,6 +69,7 @@ USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
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# kernel_errno to separate them from the libc errno. This allows -fno-common
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# in CFLAGS. Otherwise, it would cause ld to complain about the two different
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# errnos.
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# These apply to kernelspace only.
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CFLAGS += -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
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-Dmktime=kernel_mktime
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