1# Copyright (C) 1993-2022 Free Software Foundation, Inc.
2# This file is part of the GNU C Library.
3
4# The GNU C Library is free software; you can redistribute it and/or
5# modify it under the terms of the GNU Lesser General Public
6# License as published by the Free Software Foundation; either
7# version 2.1 of the License, or (at your option) any later version.
8
9# The GNU C Library is distributed in the hope that it will be useful,
10# but WITHOUT ANY WARRANTY; without even the implied warranty of
11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12# Lesser General Public License for more details.
13
14# You should have received a copy of the GNU Lesser General Public
15# License along with the GNU C Library; if not, see
16# <https://www.gnu.org/licenses/>.
17
18ifdef in-Makerules
19
20# Look for header files in hurd/ under the top-level library source directory.
21# Look for generated header files where they get created.
22includes += -I$(..)hurd -I$(common-objpfx)hurd/
23
24# We use the style `if (err = call(...))' a lot in the Hurd code,
25# where we have a lot of functions that return zero or an errno code.
26+cflags += -Wno-parentheses
27
28# Do not use any assembly code from sysdeps/unix (and subdirectories).
29# This bypasses all the system call stubs and uses any existing posix or
30# generic C files instead.
31inhibit-sysdep-asm += unix.*
32inhibit-unix-syscalls = yes
33
34# Don't try to generate anything from the installed Unix system and its
35# libraries.  That is only of use when building for a Unix system, so as to
36# be compatible with some existing binaries for that system.
37inhibit-glue = yes
38
39ifeq (,$(filter mach hurd,$(subdir)))
40# Subdirectories other than hurd/ might use the generated Hurd headers.
41# So make sure we get a chance to run in hurd/ to make them before all else.
42# (But we don't want to do this in mach/, because hurd/ needs some things
43# there, and we know mach/ doesn't need anything from hurd/.)
44
45hurd-objpfx = $(common-objpfx)hurd/
46
47# These are all the generated headers that <hurd.h> includes.
48before-compile += $(patsubst %,$(hurd-objpfx)hurd/%.h,auth io fs process)
49$(patsubst %,$(hurd-objpfx)hurd/%.h,auth io fs process): hurd-before-compile
50.PHONY: hurd-before-compile
51hurd-before-compile: $(common-objpfx)mach/mach-shortcuts.h
52	$(MAKE) -C $(..)hurd subdir=hurd before-compile no_deps=t
53endif
54
55# Hurd profil.c includes this file, so give a rule to make it.
56ifeq ($(subdir),gmon)
57$(common-objpfx)hurd/../mach/RPC_task_get_sampled_pcs.c:
58	$(MAKE) -C $(..)mach subdir=mach before-compile no_deps=t
59endif
60
61
62# Generate bits/errno.h from the section of the manual that lists all the errno
63# codes.
64
65errno.texinfo = $(..)manual/errno.texi
66
67hurd = $(..)sysdeps/mach/hurd
68
69define mach-errno-h
70($(foreach h,mach/message.h \
71	     mach/kern_return.h \
72	     mach/mig_errors.h \
73	     device/device_types.h,\
74 echo '#include <$h>';\
75 ))
76endef
77
78# We use the compiler to generate a list of absolute file names for
79# the headers we want to search for Mach error codes, listed above (and
80# incidentally, all other headers those include).
81-include $(common-objpfx)errnos.d
82$(common-objpfx)errnos.d: $(mach-errnos-deps)
83	$(mach-errno-h) | \
84	$(CC) $(CFLAGS) \
85	    $(subst -include $(common-objpfx)libc-modules.h,,$(CPPFLAGS)) \
86	    -M -x c - | \
87	sed $(sed-remove-objpfx) -e 's,- *:,mach-errnos-deps :=,' \
88	    -e 's, \.\./, $(..),g' > $@t
89	mv -f $@t $@
90
91$(hurd)/bits/errno.h: $(common-objpfx)stamp-errnos ;
92$(common-objpfx)stamp-errnos: $(hurd)/errnos.awk $(errno.texinfo) \
93			      $(mach-errnos-deps) $(common-objpfx)errnos.d
94	mkdir -p $(hurd-objpfx)bits
95	$(AWK) -f $^ > $(hurd-objpfx)bits/errno.h-tmp
96# Make it unwritable so noone will edit it by mistake.
97	-chmod a-w $(hurd-objpfx)bits/errno.h-tmp
98	$(move-if-change) $(hurd-objpfx)bits/errno.h-tmp $(hurd)/bits/errno.h
99	touch $@
100
101common-generated += errnos.d stamp-errnos
102
103# We install the real libc.a as libcrt.a and as libc.a we install a linker
104# script which does -( -lcrt -lmachuser -lhurduser -).
105
106libc-name = crt
107
108ifeq (,$(subdir))
109install-others += $(inst_libdir)/libc.a
110$(inst_libdir)/libc.a: $(hurd)/libc-ldscript $(+force); $(do-install)
111ifeq (yes,$(build-profile))
112install-others += $(inst_libdir)/libc_p.a
113$(inst_libdir)/libc_p.a: $(hurd)/libc_p-ldscript $(+force); $(do-install)
114endif
115endif
116
117# Make sure these are used to build the libc.so shared object too.  There
118# is a circular dependency between each of these shared objects and libc
119# (many high-level libc functions call stubs, stubs call low-level libc
120# functions like memcpy and mach_msg).  This works out fine at run time
121# (all the objects are loaded before resolving their symbols, so these
122# interdependencies are fine).  But to create the shared objects we must
123# link them one at a time; since each needs one or both of the others to
124# produce its DT_NEEDED entries and to assign its undefined symbols the
125# right symbol versions, we can't do any of them before the others!  To
126# get around this, we link each lib*user.so shared object twice.  First,
127# we link an object without reference to libc.so (since we haven't linked
128# libc.so yet), so it lacks a DT_NEEDED record for the libc soname it
129# depends on, and its undefined symbol references lack the symbol version
130# assignments they should have.  We will use this shared object solely to
131# link libc.so against it; that gives libc.so the proper DT_NEEDED record,
132# and symbol versions assignments (if the lib*user.so object is using them).
133# Finally we link a second version of the same lib*user.so shared object,
134# this time linked normally against libc so it gets a proper DT_NEEDED
135# record and symbol version set; this one can be installed for run-time use.
136rpcuserlibs := $(common-objpfx)mach/libmachuser.so \
137	       $(common-objpfx)hurd/libhurduser.so
138link-rpcuserlibs := $(rpcuserlibs:%user.so=%user-link.so)
139$(common-objpfx)libc.so: $(link-rpcuserlibs)
140$(common-objpfx)linkobj/libc.so: $(link-rpcuserlibs)
141rpath-dirs += mach hurd
142
143# Make sure the `lib' pass builds the dummy shared objects so
144# we can link libc against them.
145ifeq (mach,$(subdir))
146lib-noranlib: $(common-objpfx)mach/libmachuser-link.so
147endif
148ifeq (hurd,$(subdir))
149lib-noranlib: $(common-objpfx)hurd/libhurduser-link.so
150endif
151
152$(link-rpcuserlibs): %-link.so: %_pic.a
153# These shared objects are just for the purpose of linking libc,
154# so they don't need abi-note.o linked into them.
155	$(build-shlib-helper) \
156		-nostdlib -o $@ \
157		-Wl,-soname=$(*F).so$($(*F).so-version) \
158		$(build-shlib-objlist)
159libmachuser-link.so-no-z-defs = yes
160libhurduser-link.so-no-z-defs = yes
161
162# And get them into the libc.so ldscript.
163$(inst_libdir)/libc.so: $(rpcuserlibs)
164
165# The RPC stubs from these libraries are needed in building the dynamic
166# linker, too.  It must be self-contained, so we link the needed PIC
167# objects directly into the shared object.
168ifeq (elf,$(subdir))
169$(objpfx)librtld.map: $(rpcuserlibs:.so=_pic.a)
170
171CFLAGS-dl-load.c = -DEXTERNAL_MAP_FROM_FD
172endif
173
174# Override the generic Makeconfig values so we link against the RPC libs.
175link-libc-static := -Wl,--start-group \
176		    $(patsubst %,$(common-objpfx)%.a,\
177			       libc mach/libmachuser hurd/libhurduser) \
178		    $(static-gnulib) -Wl,--end-group
179link-libc-static-tests := -Wl,--start-group \
180		    $(patsubst %,$(common-objpfx)%.a,\
181			       libc mach/libmachuser hurd/libhurduser) \
182		    $(static-gnulib-tests) -Wl,--end-group
183
184ifeq ($(subdir),csu)
185
186extra-objs += static-start.o
187
188# We need special startup code for statically linked binaries.
189$(objpfx)crt0.o: $(objpfx)static-start.o $(objpfx)abi-note.o $(objpfx)init.o $(objpfx)static-reloc.o
190	$(link-relocatable)
191$(objpfx)rcrt0.o: $(objpfx)static-start.o $(objpfx)abi-note.o $(objpfx)init.o
192	$(link-relocatable)
193
194endif
195
196ifeq (hurd, $(subdir))
197sysdep_routines += cthreads
198endif
199
200ifeq (io, $(subdir))
201sysdep_routines += f_setlk close_nocancel close_nocancel_nostatus \
202		   fcntl_nocancel open_nocancel openat_nocancel read_nocancel \
203		   pread64_nocancel write_nocancel pwrite64_nocancel \
204		   wait4_nocancel \
205		   xstat fxstat lxstat xstat64 fxstat64 lxstat64 \
206		   xmknod xmknodat \
207		   fxstatat fxstatat64
208endif
209
210ifeq (misc, $(subdir))
211sysdep_routines += writev_nocancel writev_nocancel_nostatus mremap
212endif
213
214ifeq ($(subdir),sunrpc)
215sysdep_headers += nfs/nfs.h
216endif
217
218ifeq ($(subdir),socket)
219sysdep_headers += net/ethernet.h net/if_arp.h net/if_ether.h net/route.h
220endif
221
222ifeq ($(subdir),nis)
223CFLAGS-ypclnt.c += -DUSE_BINDINGDIR=1
224endif
225
226LDLIBS-pthread.so += $(objdir)/hurd/libhurduser.so
227LDLIBS-c_malloc_debug.so += $(link-rpcuserlibs)
228
229endif	# in-Makerules
230