1 # Rules for MiG interfaces that want to go into the C library.
2 # Copyright (C) 1991-2023 Free Software Foundation, Inc.
3 # This file is part of the GNU C Library.
5 # The GNU C Library is free software; you can redistribute it and/or
6 # modify it under the terms of the GNU Lesser General Public
7 # License as published by the Free Software Foundation; either
8 # version 2.1 of the License, or (at your option) any later version.
10 # The GNU C Library is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 # Lesser General Public License for more details.
15 # You should have received a copy of the GNU Lesser General Public
16 # License along with the GNU C Library; if not, see
17 # <https://www.gnu.org/licenses/>.
19 # Makefiles may define these variable before including this file:
20 # user-interfaces Names of interfaces to put user stubs in for.
21 # server-interfaces Names of interfaces to put server stubs in for.
22 # interface-library Name of interface library to build and install.
24 # interface-headers Names of generated interface header files.
25 # interface-routines Names of generated interface routines.
26 # All user stubs are put in individual files, prefixed with RPC_; header
27 # for both __ and non-__ names is put in foo.h. Server interfaces are
28 # written to foo_server.c and foo_server.h; the server functions are called
31 # Includers can also add to or modify `migdefines' to set MiG flags.
32 # They can also set `migheaderpipe' to mangle the MiG header output.
36 # Make sure no value comes from the environment, since we append to it.
37 # This is done also in ../Rules, but we append to the value before
38 # including Rules, which changes the origin.
39 ifneq "$(findstring env,$(origin generated))" ""
46 # This makefile contains a lot of implicit rules that get optimized
47 # away if the target directory does not exist.
49 -include $(objpfx)dummy.mk
52 $(make-target-directory)
55 MIGFLAGS = -DSTANDALONE -DTypeCheck=0 \
56 $(+includes) $(migdefines) -subrprefix __
57 # Putting CC in the environment makes the mig wrapper script
58 # use the same compiler setup we are using to run cpp.
59 MIG := CC='${CC}' CPP='${CPP} -x c' $(MIG)
61 .SUFFIXES: .defs # Just to set specified_rule_matched.
63 define nl # This is needed by *.ir.
68 *.ir := $(addprefix $(objpfx),$(foreach if,$(user-interfaces),$(if).ir))
70 ifndef inhibit_interface_rules
74 ifneq "$(*.ir)" "$(wildcard $(*.ir))"
75 # If any .ir file is missing, we will be unable to make all the deps.
78 generated += $(*.ir:$(objpfx)%=%)
82 # %.ir defines a variable `%-calls', which lists the RPCs defined by
83 # %.defs, and a rule to build $(%-calls:%=RPC_$(%-userprefix)%.c) from
84 # %.defs, where $(%-userprefix) is the user prefix given in %.defs. We use
85 # the kludgificacious method of defining a pattern rule to build files
86 # matching patterns we are pretty damn sure will only match the particular
87 # files we have in mind. To be so damn sure, we use the silly names
88 # RPC_*.c and the pattern R%C_*.c because using __*.c and _%*.c (or any
89 # other useful pattern) causes the rule for `host_info' to also match
90 # `xxx_host_info', and analogous lossage.
92 # Depend on %.h just so they will be built from %.uh in the
93 # makefile-rebuilding run which builds %.ir; otherwise, %.uh is built as an
94 # intermediate in order to make %.ir and then removed before re-exec, when
95 # %.uh is built all over again to build %.h.
96 $(objpfx)%.ir: $(objpfx)%.uh $(objpfx)%.h
97 ($(AWK) "NF == 4 && (\$$2 == \"Routine\" || \$$2 == \"SimpleRoutine\")\
98 { printf \"$*-calls += %s\\n\", \$$3 }" $< ;\
99 echo '$$($*-calls:%=$$(objpfx)R\%C_%.c): $$(objpfx)$*.ustamp ;';\
102 vpath Machrules ../mach # Find ourselves.
104 ifndef transform-user-stub-output
105 transform-user-stub-output = tmp
106 define transform-user-stub
107 echo "weak_alias (__$$call, $$call)" >> $(objpfx)tmp_$${call}.c;
112 # Generate `#include <NAME.defs>', taking $* for NAME.
113 # If $(NAME.defs) is defined use its value in place of `NAME.defs'.
114 define include-%.defs
115 echo '#include <$(firstword $($*.defs) $*.defs)>'
119 # Not an implicit rule so the stamps are never removed as intermediates!
120 $(patsubst %,$(objpfx)%.ustamp,$(user-interfaces)): $(objpfx)%.ustamp:
122 $(include-%.defs) | \
123 $(MIG) - /dev/null -prefix __ \
124 $(MIGFLAGS) $(user-MIGFLAGS) $(MIGFLAGS-$*) \
126 -server /dev/null -user /dev/null -header /dev/null
127 for call in $($*-calls); do \
128 $(transform-user-stub) \
129 $(move-if-change) $(objpfx)$(transform-user-stub-output)_$${call}.c \
130 $(objpfx)RPC_$${call}.c; \
133 -include $(patsubst %,$(objpfx)%.udeps,$(user-interfaces))
134 $(patsubst %,$(objpfx)%.udeps,$(user-interfaces)):
135 $(objpfx)%.udeps: $(..)mach/Machrules
136 $(make-target-directory)
137 # We must use $(CFLAGS) to get -O flags that affect #if's in header files.
138 $(include-%.defs) | \
139 $(CC) $(CFLAGS) $(CPPFLAGS) -M -x c - | \
140 sed -e 's,- *:,$(.udeps-targets):,' \
141 $(sed-remove-objpfx) > $@.new
143 .udeps-targets = $@ $(@:.udeps=.ustamp) $(@:.udeps=.uh) $(@:.udeps=.__h) \
144 $(@:.udeps=_server.c) $(@:.udeps=_server.h)
147 # Look for the server stub files where they will be written.
148 vpath %_server.c $(addprefix $(objpfx),$(sort $(dir $(server-interfaces))))
150 # Build the server stubs in $(objdir).
151 $(objpfx)%_server.c $(objpfx)%_server.h:
152 $(make-target-directory)
153 $(include-%.defs) | \
154 $(MIG) - /dev/null -prefix _S_ \
155 $(MIGFLAGS) $(server-MIGFLAGS) $(MIGFLAGS-$*) \
156 -user /dev/null -header /dev/null \
157 -server $(@:.h=.c) -sheader $(@:.c=.h)
159 # To get header files that declare both the straight and __ functions,
160 # we generate two files and paste them together.
161 $(patsubst %,$(objpfx)%.uh,$(user-interfaces)): $(objpfx)%.uh:; $(mig.uh)
163 $(make-target-directory)
164 $(include-%.defs) | \
165 $(MIG) - /dev/null $(MIGFLAGS) $(MIGFLAGS-$*) \
166 -header $@ -server /dev/null -user /dev/null
168 $(patsubst %,$(objpfx)%.__h,$(user-interfaces)): $(objpfx)%.__h:; $(mig.__h)
170 $(make-target-directory)
171 $(include-%.defs) | \
172 $(MIG) - /dev/null $(MIGFLAGS) $(MIGFLAGS-$*) -prefix __ \
173 -header $@ -server /dev/null -user /dev/null
176 $(patsubst %,$(objpfx)%.h,$(user-interfaces)): $(objpfx)%.h: $(objpfx)%.__h \
178 # The last line of foo.__h is "#endif _foo_user_".
179 # The first two lines of foo.uh are "#ifndef _foo_user_"/"#define _foo_user_".
180 (sed -e '$$d' $<; sed -e '1,2d' $(word 2,$^)) $(migheaderpipe) > $@-new
183 interface-routines := $(foreach if,$(user-interfaces), \
184 $(addprefix RPC_,$($(if)-calls))) \
185 $(server-interfaces:%=%_server)
186 interface-headers := $(user-interfaces:%=%.h) \
187 $(server-interfaces:%=%_server.h)
189 # Remove the generated user stub source and header files,
190 # and don't distribute them.
191 mach-generated = $(interface-routines:%=%.c) $(interface-headers) \
192 $(foreach h,$(user-interfaces),$h.uh $h.__h)
193 generated += $(mach-generated)
195 # These are needed to generate the dependencies.
196 before-compile += $(interface-headers:%=$(objpfx)%)
198 # Don't let these be intermediate files and get removed.
199 $(foreach h,$(interface-headers:%.h=$(objpfx)%),$h.h $h.__h $h.uh) :
200 $(interface-routines:%=$(objpfx)%.c) :
202 # Convenient target to generate all the headers.
203 .PHONY: interface-headers
204 interface-headers: $(interface-headers)
206 # Don't automatically generate dependencies for the sources we generate.
207 # There are likely to be a whole lot of them, and we know their
208 # dependencies ahead of time anyway because they're boilerplate.
209 omit-deps += $(interface-routines)
211 # Choose any single module generated by MiG. We will compute this module's
212 # dependencies and then assume all other MiG-generated modules depend on the
214 some-if-rtn := $(firstword $(interface-routines))
216 $(foreach o,$(object-suffixes),$(interfaces-routines:%=%$o)): $(some-if-rtn).d
217 generated += $(some-if-rtn).d
220 # If defined, $(interface-library) is `libNAME'. It is to be a library
221 # containing all the MiG-generated functions for the specified interfaces.
223 ifdef interface-library
225 $(interface-library)-routines = $(interface-routines) stack_chk_fail_local
226 $(interface-library)-shared-only-routines = stack_chk_fail_local
227 extra-libs += $(interface-library)
228 extra-libs-others += $(interface-library)
230 ifeq (yes,$(build-shared))
231 interface.so = $(interface-library:=.so)
233 # Depend on libc.so so a DT_NEEDED is generated in the shared objects.
234 $(objpfx)$(interface.so): $(common-objpfx)libc.so