path: root/Makefile

# 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/>.

#
#	Master Makefile for the GNU C library
#
ifneq (,)
This makefile requires GNU Make.
endif

include Makeconfig


# This is the default target; it makes everything except the tests.
.PHONY: all help minihelp
all: minihelp lib others

help:
	@sed '0,/^help-starts-here$$/d' Makefile.help

minihelp:
	@echo
	@echo type \"make help\" for help with common glibc makefile targets
	@echo


ifneq ($(AUTOCONF),no)

define autoconf-it
@-rm -f $@.new
$(AUTOCONF) $(ACFLAGS) $< > $@.new
chmod a-w$(patsubst %,$(comma)a+x,$(filter .,$(@D))) $@.new
mv -f $@.new $@
endef

configure: configure.ac aclocal.m4; $(autoconf-it)
%/configure: %/configure.ac aclocal.m4; $(autoconf-it)
%/preconfigure: %/preconfigure.ac aclocal.m4; $(autoconf-it)

endif # $(AUTOCONF) = no


# We don't want to run anything here in parallel.
.NOTPARALLEL:

# These are the targets that are made by making them in each subdirectory.
+subdir_targets	:= subdir_lib objects objs others subdir_mostlyclean	\
		   subdir_clean subdir_distclean subdir_realclean	\
		   tests xtests						\
		   subdir_update-abi subdir_check-abi			\
		   subdir_update-all-abi				\
		   subdir_echo-headers					\
		   subdir_install					\
		   subdir_objs subdir_stubs subdir_testclean		\
		   $(addprefix install-, no-libc.a bin lib data headers others)

headers := limits.h values.h features.h features-time64.h gnu-versions.h \
	   bits/xopen_lim.h gnu/libc-version.h stdc-predef.h \
	   bits/libc-header-start.h

echo-headers: subdir_echo-headers

# The headers are in the include directory.
subdir-dirs = include
vpath %.h $(subdir-dirs)

# What to install.
install-others = $(inst_includedir)/gnu/stubs.h
install-bin-script =

ifeq (yes,$(build-shared))
headers += gnu/lib-names.h
endif

include Makerules

ifeq ($(build-programs),yes)
others: $(addprefix $(objpfx),$(install-bin-script))
endif

# Install from subdirectories too.
install: subdir_install

# Explicit dependency so that `make install-headers' works
install-headers: install-headers-nosubdir

# Make sure that the dynamic linker is installed before libc.
$(inst_slibdir)/libc-$(version).so: elf/ldso_install

.PHONY: elf/ldso_install
elf/ldso_install:
	$(MAKE) -C $(@D) $(@F)

# Create links for shared libraries using the `ldconfig' program if possible.
# Ignore the error if we cannot update /etc/ld.so.cache.
ifeq (no,$(cross-compiling))
ifeq (yes,$(build-shared))
install:
	-test ! -x $(elf-objpfx)ldconfig || LC_ALL=C \
	  $(elf-objpfx)ldconfig $(addprefix -r ,$(install_root)) \
				$(slibdir) $(libdir)
ifneq (no,$(PERL))
ifeq (/usr,$(prefix))
ifeq (,$(install_root))
	LD_SO=$(ld.so-version) CC="$(CC)" $(PERL) scripts/test-installation.pl $(common-objpfx)
endif
endif
endif
endif
endif

# Build subdirectory lib objects.
lib-noranlib: subdir_lib

ifeq (yes,$(build-shared))
# Build the shared object from the PIC object library.