私は Linux の新しいユーザーで、Pintos Project #02 - ユーザー プログラムを試みています。Pintos のみをインストールし、"make" でサンプルをビルドしようとしたところ、次のエラーが発生しました。
7fcdfb62f000-7fcdfb631000 rw-p 00000000 00:00 0
7fcdfb631000-7fcdfb632000 r--p 00022000 08:07 4619 /lib/x86_64-linux-gnu/ld-2.17.so
7fcdfb632000-7fcdfb634000 rw-p 00023000 08:07 4619 /lib/x86_64-linux-gnu/ld-2.17.so
7fffa164a000-7fffa166b000 rw-p 00000000 00:00 0 [stack]
7fffa16ed000-7fffa16ef000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
../Makefile.userprog:42: recipe for target 'libc.a' failed
make: *** [libc.a] Aborted (core dumped)
make: *** Deleting file 'libc.a'
誰が何が起こっているのか説明してもらえますか?
参照用の Makefile.userprog は次のとおりです。
# -*- makefile -*-
$(PROGS): CPPFLAGS += -I$(SRCDIR)/lib/user -I.
# Linker flags.
$(PROGS): LDFLAGS += -nostdlib -static -Wl,-T,$(LDSCRIPT)
$(PROGS): LDSCRIPT = $(SRCDIR)/lib/user/user.lds
# Library code shared between kernel and user programs.
lib_SRC = lib/debug.c # Debug code.
lib_SRC += lib/random.c # Pseudo-random numbers.
lib_SRC += lib/stdio.c # I/O library.
lib_SRC += lib/stdlib.c # Utility functions.
lib_SRC += lib/string.c # String functions.
lib_SRC += lib/arithmetic.c # 64-bit arithmetic for GCC.
lib_SRC += lib/ustar.c # Unix standard tar format utilities.
exm_SRC += example/halt.c # changes done
# User level only library code.
lib/user_SRC = lib/user/debug.c # Debug helpers.
lib/user_SRC += lib/user/syscall.c # System calls.
lib/user_SRC += lib/user/console.c # Console code.
LIB_OBJ = $(patsubst %.c,%.o,$(patsubst %.S,%.o,$(lib_SRC) $(lib/user_SRC)))
LIB_DEP = $(patsubst %.o,%.d,$(LIB_OBJ))
LIB = lib/user/entry.o libc.a
PROGS_SRC = $(foreach prog,$(PROGS),$($(prog)_SRC))
PROGS_OBJ = $(patsubst %.c,%.o,$(patsubst %.S,%.o,$(PROGS_SRC)))
PROGS_DEP = $(patsubst %.o,%.d,$(PROGS_OBJ))
all: $(PROGS)
define TEMPLATE
$(1)_OBJ = $(patsubst %.c,%.o,$(patsubst %.S,%.o,$($(1)_SRC)))
$(1): $$($(1)_OBJ) $$(LIB) $$(LDSCRIPT)
$$(CC) $$(LDFLAGS) $$($(1)_OBJ) $$(LIB) -o $$@
endef
$(foreach prog,$(PROGS),$(eval $(call TEMPLATE,$(prog))))
libc.a: $(LIB_OBJ)
rm -f $@ # LINE 42
ar r $@ $^
ranlib $@
clean::
rm -f $(PROGS) $(PROGS_OBJ) $(PROGS_DEP)
rm -f $(LIB_DEP) $(LIB_OBJ) lib/user/entry.[do] libc.a
.PHONY: all clean
-include $(LIB_DEP) $(PROGS_DEP)