[Devel] Re: [PATCH][user-cr] Create libeclone.a

[Oren Laadan]

Sukadev Bhattiprolu wrote:
> Tested the changes on x86_32 with a stub to simulate the special case for
> powerpc below. Appreciate if it could be tested on other architectures 
> specially powerpc.

Look good, I'll add it.

> 
> Also, can we push genstack.o into libeclone.a to simplify the Makefile ?

That too.

Oren.

> 
> thanks,
> 
> Sukadev
> 
> ---
> 
> From: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
> Date: Sat, 6 Feb 2010 10:45:10 -0800
> Subject: [PATCH][user-cr] Create libeclone.a
> 
> The user-api to the eclone() system call is architecture dependent.
> 
> Besides checkpoint/restart code, this api could be used by eclone() test
> cases (see cr-tests.git tree) and possibly other users of eclone().
> 
> To avoid duplication of the arch dependent code, move the api into
> libeclone.a (as suggested by Serge Hallyn).
> 
> Signed-off-by: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
> ---
>  Makefile |   28 +++++++++++++++++++---------
>  1 files changed, 19 insertions(+), 9 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 35188f9..eb39b1f 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -5,7 +5,7 @@ CKPT_HEADERS = include/linux/checkpoint.h \
>  		include/linux/checkpoint_hdr.h \
>  		include/asm/checkpoint_hdr.h
>  
> -# detect architecture (for clone_with_pids)
> +# detect architecture (for eclone)
>  SUBARCH = $(patsubst i%86,x86_32,$(shell uname -m))
>  
>  # compile with debug ?
> @@ -19,8 +19,11 @@ CFLAGS += -g $(WARNS) $(CKPT_INCLUDE) $(DEBUG)
>  
>  # install dir
>  INSTALL_DIR = /bin
> +LIB_INSTALL_DIR = /lib
>  
> -PROGS =	checkpoint restart ckptinfo nsexeccwp
> +ECLONE_PROGS = restart nsexeccwp
> +PROGS =	checkpoint ckptinfo $(ECLONE_PROGS) 
> +LIB_ECLONE =	libeclone.a
>  
>  # other cleanup
>  OTHER = ckptinfo_types.c
> @@ -32,21 +35,26 @@ LDLIBS = -lm
>  all: $(PROGS)
>  	@make -C test
>  
> +$(LIB_ECLONE):
> +	ar ruv $(LIB_ECLONE) $^
> +
>  # restart needs to be thread-safe
>  restart: CFLAGS += -D__REENTRANT -pthread
>  
>  # eclone() is architecture specific
> +#
> +# TODO: We could push genstack.o also into $(LIB_ECLONE), but it would make
> +# 	the 'genstack()' symbol public and not sure if it will cause problems
> +# 	for other applications.
>  ifneq ($(SUBARCH),)
> -restart: clone_$(SUBARCH).o genstack.o
> -restart: CFLAGS += -DARCH_HAS_ECLONE
> -nsexeccwp: clone_$(SUBARCH).o genstack.o
> -nsexeccwp: CFLAGS += -DARCH_HAS_ECLONE
> +$(ECLONE_PROGS): $(LIB_ECLONE) genstack.o
> +$(ECLONE_PROGS): CFLAGS += -DARCH_HAS_ECLONE
> +$(LIB_ECLONE): clone_$(SUBARCH).o
>  endif
>  
>  # on powerpc, need also assembly file
>  ifeq ($(SUBARCH),ppc)
> -restart: clone_$(SUBARCH)_.o
> -nsexeccwp: clone_$(SUBARCH)_.o
> +$(LIB_ECLONE): clone_$(SUBARCH)_.o
>  endif
>  
>  # ckptinfo dependencies
> @@ -56,6 +64,8 @@ ckptinfo_types.c: $(CKPT_HEADERS) ckptinfo.py
>  	cat $(CKPT_HEADERS) | ./ckptinfo.py > ckptinfo_types.c
>  
>  install:
> +	@echo /usr/bin/install -m 755 $(LIB_ECLONE) $(LIB_INSTALL_DIR)
> +	@/usr/bin/install -m 755 $(LIB_ECLONE) $(LIB_INSTALL_DIR)
>  	@echo /usr/bin/install -m 755 checkpoint restart ckptinfo $(INSTALL_DIR)
>  	@/usr/bin/install -m 755 checkpoint restart ckptinfo $(INSTALL_DIR)
>  
> @@ -68,5 +78,5 @@ distclean: clean
>  	@rm -f $(CKPT_HEADERS)
>  
>  clean:
> -	@rm -f $(PROGS) $(OTHER) *~ *.o headers.h
> +	@rm -f $(PROGS) $(OTHER) $(LIB_ECLONE) *~ *.o headers.h
>  	@make -C test clean
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