mirror of
https://sourceware.org/git/glibc.git
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e32f487e1c
* sysdeps/unix/sysv/linux/Versions [libc, GLIBC_2.4]: Export unshare. * sysdeps/unix/sysv/linux/syscalls.list: Add unshare syscall. * sysdeps/unix/Makefile ($(objpfx)stub-syscalls.c): Add some preprocessor magic so that the compiler won't see the prototypes for the functions we are defining as stubs.
366 lines
12 KiB
Makefile
366 lines
12 KiB
Makefile
# Copyright (C) 1991,1992,1993,1994,1995,1996,1997,1998,1999,2003, 2006
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# Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, write to the Free
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# Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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# 02111-1307 USA.
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# The unix-specific configure fragment writes `unix-generated' in config.make.
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config-generated := $(config-generated) $(unix-generated)
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ifeq (,$(filter-out $(sysdep_dir)/generic/ $(common-objpfx),\
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$(dir $(firstword $(wildcard $(+sysdep_dirs:%=%/bits/local_lim.h))))))
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ifneq (,$(wildcard $(sysincludedir)/sys/param.h))
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mk-local_lim-CFLAGS += -DHAVE_SYS_PARAM_H
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endif
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ifneq (,$(wildcard $(sysincludedir)/sys/limits.h))
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mk-local_lim-CFLAGS += -DHAVE_SYS_LIMITS_H
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endif
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ifneq (,$(wildcard $(sysincludedir)/limits.h))
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mk-local_lim-CFLAGS += -DHAVE_LIMITS_H
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endif
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$(common-objpfx)bits/local_lim.h: $(common-objpfx)mk-local_lim
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$(dir $<)$(notdir $<) > $@-t
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mv -f $@-t $@
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$(common-objpfx)mk-local_lim: $(sysdep_dir)/unix/mk-local_lim.c
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$(common-objdir-compile)
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before-compile += $(common-objpfx)bits/local_lim.h
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common-generated += bits/local_lim.h mk-local_lim
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endif
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ifeq (,$(filter-out $(sysdep_dir)/generic/ $(common-objpfx),\
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$(patsubst %/sys/param.h,%/,\
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$(firstword $(wildcard $(+sysdep_dirs:%=%/sys/param.h))))))
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before-compile := $(before-compile) $(common-objpfx)sys/param.h
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$(common-objpfx)sys/param.h: $(sysincludedir)/sys/param.h
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$(make-target-directory)
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(echo '#ifndef _SYS_PARAM_H'; \
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echo '#define _SYS_PARAM_H 1'; \
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echo '#include <endian.h>'; \
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$(AWK) < $< \
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'/^#define[ ]*NULL/ { print "#ifndef NULL"; \
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print $$0; \
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print "#endif"; \
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was_null = 1 } \
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{ if (!was_null) print $$0; \
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was_null = 0 }'; \
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echo '#ifndef MAXHOSTNAMELEN'; \
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echo '#define MAXHOSTNAMELEN 64 /* XXX */'; \
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echo '#endif /* No MAXHOSTNAMELEN. */'; \
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echo '#endif /* sys/param.h */') > $@-tmp
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mv $@-tmp $@
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$(common-objpfx)param.h.c: $(sysincludedir)/sys/param.h
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rm -f $@
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cp $< $@
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$(common-objpfx)param.h.dep: $(common-objpfx)param.h.c \
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$(sysdep_dir)/unix/Makefile
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$(+mkdep) -I$(sysincludedir) $< \
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| sed > $@-t \
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-e 's@$(sysincludedir)/sys/param.h@@' \
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-e 's@^.*:@@' \
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-e 's@$<@@g' \
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-e 's@$(sysincludedir)/*@@g' \
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-e 's@\\$$@@' \
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-e 's@^@sys/param.h-includes := $$(sys/param.h-includes) @'
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mv $@-t $@
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# Get the generated definition of sys/param.h-includes.
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ifndef no_deps
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-include $(common-objpfx)param.h.dep
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endif
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# Don't preempt our own headers.
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sys/param.h-includes := \
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$(filter-out $(patsubst $(..)%,%,\
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$(wildcard $(addprefix $(..),\
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$(sys/param.h-includes)))),\
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$(sys/param.h-includes))
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.PHONY: sys/param.h-includes
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sys/param.h-includes: $(addprefix $(common-objpfx),$(sys/param.h-includes))
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ifdef sys/param.h-includes
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# Copy the system files to $(common-objdir).
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$(addprefix $(common-objpfx),$(sys/param.h-includes)): $(common-objpfx)%: \
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$(sysincludedir)/%
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$(make-target-directory)
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# Some of these files sometimes contain conflicting declarations for htons,
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# ntohs, etc. They also often contain definitions of *_ENDIAN and
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# BYTE_ORDER, which we define ourselves in <endian.h>.
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sed -e '/[ ]*[hn]to[nh][sl][ (]*/d' \
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-e '/^#define[ ]*[A-Z]*_ENDIAN/d' \
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-e '/^#define[ ]*BYTE_ORDER/d' \
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$< > $@-t
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mv $@-t $@
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endif
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common-generated := $(common-generated) \
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sys/param.h $(sys/param.h-includes) param.h.c param.h.dep
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ifeq ($(subdir),misc)
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# Install system headers the system sys/param.h uses.
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sysdep_headers := $(sysdep_headers) $(sys/param.h-includes)
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endif # misc
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endif # No sysdep sys/param.h.
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ifeq (,$(filter-out $(sysdep_dir)/generic/ $(common-objpfx),\
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$(dir $(firstword $(wildcard $(+sysdep_dirs:%=%/bits/errno.h))))))
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# These need to exist before any compiling is done,
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# so cpp doesn't instead find the generic versions.
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before-compile := $(before-compile) $(common-objpfx)bits/errno.h
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$(common-objpfx)bits/errno.h: $(common-objpfx)make-errnos
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$(dir $<)$(notdir $<) > $@-tmp
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mv $@-tmp $@
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$(common-objpfx)make-errnos: $(common-objpfx)make-errnos.c
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$(common-objdir-compile)
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$(common-objpfx)make-errnos.c: $(sysdep_dir)/unix/errnos-tmpl.c \
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$(sysdep_dir)/unix/errnos.awk $(common-objpfx)errnos
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$(AWK) -f $(word 2,$^) errnos="`tr '\012' ' ' < $(word 3,$^)`" $< > $@T
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mv $@T $@
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$(common-objpfx)errnos: $(wildcard $(sysincludedir)/errno.h \
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$(sysincludedir)/sys/errno.h)
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sed -n 's/^#define[ ]*\(E[A-Z0-9][A-Z0-9]*\)[ ].*$$/\1/p' \
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$^ > $@-tmp
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mv $@-tmp $@
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common-generated := $(common-generated) \
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errnos.h errnos make-errnos make-errnos.c
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endif
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ifeq (,$(filter-out $(sysdep_dir)/generic/ $(common-objpfx),\
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$(dir $(firstword $(wildcard $(+sysdep_dirs:%=%/bits/ioctls.h))))))
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before-compile := $(before-compile) $(common-objpfx)bits/ioctls.h
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$(common-objpfx)bits/ioctls.h: $(common-objpfx)make-ioctls
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$(dir $<)$(notdir $<) > $@-tmp
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mv $@-tmp $@
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ioctl-includes := sys/termios.h net/nit.h
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ioctl-includes := $(wildcard $(addprefix $(sysincludedir)/,$(ioctl-includes)))
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make-ioctls-CFLAGS := $(subst /,_,$(subst .,_,\
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$(patsubst $(sysincludedir)/%,-DHAVE_%,\
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$(ioctl-includes))))
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$(common-objpfx)make-ioctls: $(common-objpfx)make-ioctls.c
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$(common-objdir-compile)
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$(common-objpfx)make-ioctls.c: $(sysdep_dir)/unix/ioctls-tmpl.c \
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$(sysdep_dir)/unix/ioctls.awk \
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$(common-objpfx)ioctls
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$(AWK) -f $(word 2,$^) requests="`cat $(word 3,$^)`" $< > $@T
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mv $@T $@
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bits_termios.h := $(firstword $(wildcard $(+sysdep_dirs:%=%/bits/termios.h)))
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ifeq ($(bits_termios.h),$(sysdep_dir)/generic/bits/termios.h)
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bits_termios.h := # Ignore the generic version.
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endif
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# If there is a system-specific <bits/termios.h> file, we want to omit
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# all the symbols it defines from ioctls. Otherwise, both
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# <bits/ioctls.h> and <bits/termios.h> would define them. The
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# system-specific <bits/termios.h> file presumably defines them with
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# the same values as we find from the system's headers. We also want
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# to omit from ioctls the symbols defined in our own
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# <sys/ttydefaults.h>, to avoid multiple definition conflicts. We use
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# snarf-ioctls on these files to find what symbols we want to omit.
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# fgrep -xv gives all lines which do not match in their entirety;
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# without -x, CSTOP's presence elided TIOCSTOP.
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$(common-objpfx)ioctls: $(sysdep_dir)/unix/snarf-ioctls \
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$(sysincludedir)/sys/ioctl.h $(ioctl-includes)
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$(dir $<)$(notdir $<) $(filter-out $<,$^) \
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| fgrep -xv "`($(dir $<)$(notdir $<) $(bits_termios.h) \
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$(..)sysdeps/generic/sys/ttydefaults.h; \
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echo NULL) \
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| sort | uniq`" \
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| sort | uniq | tr '\012' ' ' > $@-tmp
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mv $@-tmp $@
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common-generated := $(common-generated) \
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bits/ioctls.h ioctls make-ioctls make-ioctls.c
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endif
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ifeq ($(subdir),stdio-common)
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ifeq (,$(filter-out $(sysdep_dir)/generic/ $(objpfx),\
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$(dir $(firstword $(wildcard $(+sysdep_dirs:%=%/errlist.c))))))
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before-compile: $(objpfx)errlist.c
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$(objpfx)errlist.c: $(objpfx)make_errlist
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@rm -f $@
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$(dir $<)$(notdir $<) > $@-tmp
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mv $@-tmp $@
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$(objpfx)make_errlist: $(sysdep_dir)/unix/make_errlist.c
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$(native-compile)
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generated := $(generated) make_errlist errlist.c
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endif
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endif # stdio-common
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ifeq (,$(filter-out $(sysdep_dir)/generic/ $(common-objpfx),\
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$(dir $(firstword $(wildcard $(+sysdep_dirs:%=%/sys/syscall.h))))))
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# The syscall code assumes a file <sys/syscall.h> that defines macros
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# `SYS_call' for syscall `call'. Variations on this I have seen include:
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# it's in <sys/syscall.h>;
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# it's in <sys.s>;
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# it defines `CALL' instead of `SYS_call'.
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# Irix has a <syscall.h> which is not what we want, so check for <sys.s> first.
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# Find a file that might have these. NOTE: This list of possibilities is
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# repeated in sysdeps/unix/configure and the two should be kept in sync.
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syscall.h := $(firstword $(wildcard $(addprefix $(sysincludedir)/, \
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sys.s sys/sys.s \
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sys.S sys/sys.S \
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syscall.h sys/syscall.h \
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)))
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ifdef syscall.h
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# Transmogrify any of several formats of the file into the one we want.
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$(common-objpfx)sys/syscall.h: $(syscall.h)
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$(make-target-directory)
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tr '[A-Z]' '[a-z]' < $< | \
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sed -e 's/[ ]sys_/ /' \
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-e 's/^#define[ ]*\([a-z0-9_]*\)[ ]*/#define SYS_\1 /' \
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-e 's/[ ]sys_/ SYS_/' \
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-e 's/SYS_syscall_basenum/syscall_basenum/g' \
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-e 's/SYS_kerncall_basenum/kerncall_basenum/g' \
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-e 's/SYS_sysvoffset/sysvoffset/g' \
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-e '/^#/!d' \
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-e '/^#ident/d' \
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-e 's-\(/\*[^*]*\)$$-\1\*/-' \
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> $@-tmp
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mv $@-tmp $@
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before-compile += $(common-objpfx)sys/syscall.h
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common-generated += sys/syscall.h
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endif
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endif
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ifndef inhibit-unix-syscalls
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# Sysdep dirs unix/... can contain a file syscalls.list,
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# which specifies objects to be compiled as simple Unix system calls.
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-include $(common-objpfx)sysd-syscalls
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omit-deps += $(unix-syscalls)
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ifeq (misc,$(subdir))
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sysdep_routines += $(unix-extra-syscalls)
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ifdef unix-stub-syscalls
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# The system call entry points in this list are supposed to be additional
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# functions not overriding any other sysdeps/.../call.c implementation, but
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# their system call numbers are unavailable in the kernel headers we're
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# using. Instead of a system call stub, these get a function that fails
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# with ENOSYS. We just generate a single module defining one function and
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# making all these entry point names aliases for it.
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sysdep_routines += stub-syscalls
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$(objpfx)stub-syscalls.c: $(common-objpfx)sysd-syscalls \
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$(..)sysdeps/unix/Makefile
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$(make-target-directory)
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(for call in $(unix-stub-syscalls); do \
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echo "#define $$call RENAMED_$$call"; \
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done; \
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echo '#include <errno.h>'; \
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for call in $(unix-stub-syscalls); do \
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echo "#undef $$call"; \
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done; \
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echo 'long int _no_syscall (void)'; \
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echo '{ __set_errno (ENOSYS); return -1L; }'; \
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for call in $(unix-stub-syscalls); do \
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case $$call in \
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*@@*) ver=$${call##*@}; call=$${call%%*@}; \
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echo "strong_alias (_no_syscall, $${call}_$${ver})"; \
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echo "default_symbol_version \
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($${call}_$${ver}, $$call, $$ver);" ;; \
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*@@*) ver=$${call##*@}; call=$${call%%*@}; \
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echo "strong_alias (_no_syscall, $${call}_$${ver})"; \
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echo "symbol_version ($${call}_$${ver}, $$call, $$ver);" ;; \
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*) echo "weak_alias (_no_syscall, $$call)"; \
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echo "stub_warning ($$call)"; \
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echo "weak_alias (_no_syscall, __GI_$$call)" ;; \
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esac; \
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echo '#include <stub-tag.h>'; \
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done) > $@T
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mv -f $@T $@
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generated += stub-syscalls.c
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endif
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endif
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export sysdirs
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export asm_CPP := $(COMPILE.S) -E -x assembler-with-cpp
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# This is the end of the pipeline for compiling the syscall stubs.
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# The stdin in assembler with cpp using sysdep.h macros.
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# Be sure to disable debugging info since it would all just say "<stdin>".
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compile-syscall = $(filter-out -g%,$(COMPILE.S)) -x assembler-with-cpp -o $@ -
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ifndef avoid-generated
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$(common-objpfx)sysd-syscalls: $(..)sysdeps/unix/make-syscalls.sh \
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$(wildcard $(+sysdep_dirs:%=%/syscalls.list))
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for dir in $(+sysdep_dirs); do \
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test -f $$dir/syscalls.list && \
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{ $(SHELL) $(dir $<)$(notdir $<) $$dir || exit 1; }; \
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test $$dir = $(..)sysdeps/unix && break; \
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done > $@T
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mv -f $@T $@
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endif
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# The syscall objects depend on s-proto.d or s-proto-cancel.d, which
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# are generated to specify dependencies generated syscalls have on
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# headers.
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# These deps use file names relative to a subdir, so don't
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# include them in the parent directory.
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ifneq (,$(filter $(unix-syscalls),$(routines) $(sysdep_routines) $(aux)))
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ifndef no_deps
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-include $(common-objpfx)s-proto.d
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-include $(common-objpfx)s-proto-bp.d
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-include $(common-objpfx)s-proto-cancel.d
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endif
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endif
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$(common-objpfx)s-%.d: $(..)sysdeps/unix/s-%.S \
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$(wildcard $(+sysdep_dirs:%=%/syscalls.list))
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$(+make-deps)
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common-generated += s-proto.d s-proto-bp.d s-proto-cancel.d
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postclean-generated += sysd-syscalls
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endif
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