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# Copyright (C) 1991-2025 Free Software Foundation, Inc.
# This file is part of the GNU C Library.

# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.

# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.

#
#	Common rules for making the GNU C library.  This file is included
#	by the top-level Makefile and by all subdirectory makefiles
#	(through Rules).
#
ifneq (,)
This makefile requires GNU Make.
endif

REQUIRED_MAKE_VERSION = 3.74
REAL_MAKE_VERSION = $(firstword $(MAKE_VERSION))

ifneq ($(REQUIRED_MAKE_VERSION), \
       $(firstword $(sort $(REAL_MAKE_VERSION) $(REQUIRED_MAKE_VERSION))))
Wrong GNU Make version.  See above for the version needed.
endif


ifdef	subdir
..	:= ../
endif	# subdir

# If `sources' was defined by the parent makefile, undefine it so
# we will later get it from wildcard search in this directory.
ifneq	"$(findstring env,$(origin sources))" ""
sources :=
endif

oPATH := $(PATH)
PATH := this definition should take precedence over $(oPATH)
ifeq ($(PATH),$(oPATH))
You must not use the -e flag when building the GNU C library.
else
PATH := $(oPATH)
endif

ifndef +included-Makeconfig
include $(..)Makeconfig
endif

# This variable is used in ``include $(o-iterator)'' after defining
# $(o-iterator-doit) to produce some desired rule using $o for the object
# suffix, and setting $(object-suffixes-left) to $(object-suffixes); a copy
# is produced for each object suffix in use.
o-iterator = $(patsubst %,$(..)o-iterator.mk,$(object-suffixes-left))

# Include any system-specific makefiles.

# This is here so things in sysdep Makefiles can easily depend on foo.h as
# appropriate and not worry about where foo.h comes from, which may be
# system dependent and not known by that Makefile.
vpath %.h $(subst $(empty) ,:,$(strip $(common-objpfx) $(objpfx) \
				      $(+sysdep_dirs) $(..)))

# The same is true for RPC source files.
vpath %.x $(subst $(empty) ,:,$(strip $(common-objpfx) $(objpfx) \
				      $(+sysdep_dirs) $(..)))

# Some sysdep makefiles use this to distinguish being included here from
# being included individually by a subdir makefile (hurd/Makefile needs this).
in-Makerules := yes

sysdep-makefiles := $(wildcard $(sysdirs:=/Makefile))
ifneq (,$(sysdep-makefiles))
include $(sysdep-makefiles)
endif


# Reorder before-compile so that mach things come first, and hurd things
# second, before all else.  The mach and hurd subdirectories have many
# generated header files which the much of rest of the library depends on,
# so it is best to build them first (and mach before hurd, at that).
before-compile := $(filter $(common-objpfx)mach% $(common-objpfx)hurd%,\
			   $(before-compile)) \
		  $(filter-out $(common-objpfx)mach% $(common-objpfx)hurd%,\
			       $(before-compile))

# Even before that, we need abi-versions.h which is generated right here.
ifeq ($(build-shared),yes)
ifndef avoid-generated
before-compile := $(common-objpfx)abi-versions.h $(before-compile)
$(common-objpfx)abi-versions.h: $(..)scripts/abi-versions.awk \
				$(common-objpfx)Versions.all
	LC_ALL=C $(AWK) -f $^ > $@T
	mv -f $@T $@

$(common-objpfx)%.latest: $(common-objpfx)abi-versions.h
	sed -n '/ VERSION_$*_/{s/^.*_\([A-Z0-9_]*\).*$$/\1/;h;};$${g;p;}' \
	    $(common-objpfx)abi-versions.h > $@T
	mv -f $@T $@

# first-versions.h and ldbl-compat-choose.h provide macros used in
# various symbol versioning macro calls.
before-compile := $(common-objpfx)first-versions.h \
		  $(common-objpfx)ldbl-compat-choose.h $(before-compile)
$(common-objpfx)first-versions.h: $(common-objpfx)versions.stmp
$(common-objpfx)ldbl-compat-choose.h: $(common-objpfx)versions.stmp
endif # avoid-generated
endif # $(build-shared) = yes

ifndef avoid-generated
ifneq (,$(CXX))
# If C++ headers <cstdlib> or <cmath> are used, GCC 6 will include
# /usr/include/stdlib.h or /usr/include/math.h from "#include_next"
# (instead of stdlib/stdlib.h or math/math.h in the glibc source
# directory), and this turns up as a make dependency.  An implicit