85 lines
3.3 KiB
Makefile
85 lines
3.3 KiB
Makefile
# Makefile for csu code for GNU C library.
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# Copyright (C) 1995 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 Library General Public License
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# as published by the Free Software Foundation; either version 2 of
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# 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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# Library General Public License for more details.
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# You should have received a copy of the GNU Library General Public
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# License along with the GNU C Library; see the file COPYING.LIB. If
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# not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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# Cambridge, MA 02139, USA.
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# This directory contains the C startup code (that which calls main). This
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# consists of the startfile, built from start.c and installed as crt0.o
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# (traditionally) or crt1.o (for ELF); and some initialization code which
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# is in the C library itself. In ELF we also install crti.o and crtn.o,
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# special "initializer" and "finalizer" files in used in the link to make
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# the .init and .fini sections work right; both these files are built (in
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# an arcane manner) from initfini.c.
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subdir := csu
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csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
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extra-objs = start.o $(start-installed-name) $(csu-dummies)
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omit-deps = $(patsubst %.o,%,$(start-installed-name) $(csu-dummies))
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install-lib = $(start-installed-name) $(csu-dummies)
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distribute = initfini.c
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all: # Make this the default target; it will be defined in Rules.
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include ../Makeconfig
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ifneq ($(elf),yes)
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# When not using ELF, there is just one startfile, called crt0.o.
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start-installed-name = crt0.o
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else
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# In the ELF universe, crt0.o is called crt1.o, and there are
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# some additional bizarre files.
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start-installed-name = crt1.o
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install-lib += crti.o crtn.o
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extra-objs += crti.o crtn.o
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generated += crti.s crtn.s
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omit-deps += crti crtn
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# Compile initfini.c to assembly code, which contains embedded shell
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# commands that prodice crti.s-new and crtn.s-new when run. We need to
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# disable emission of .size directives and debugging information, since
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# they will get confused by the splitting of the output we do.
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$(objpfx)cr%i.s $(objpfx)cr%n.s: initfini.c
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-rm -f $(objpfx)crtcommon.tmp
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(echo 'cat > crtcommon.tmp <<\EOF_common'; \
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$(CC) $< $(CPPFLAGS) $(CFLAGS) -finhibit-size-directive -g0 -S -o -; \
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echo 'EOF_common') | (cd $(@D); $(SHELL))
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cat $(objpfx)crtcommon.tmp >> $(objpfx)crti.s-new
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cat $(objpfx)crtcommon.tmp >> $(objpfx)crtn.s-new
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rm -f $(objpfx)crtcommon.tmp
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mv -f $(objpfx)crti.s-new $(objpfx)crti.s
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mv -f $(objpfx)crtn.s-new $(objpfx)crtn.s
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endif
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include ../Rules
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# The startfile is installed under different names, so we just call our
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# source file `start.c' and copy to the installed name after compiling.
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$(objpfx)$(start-installed-name): $(objpfx)start.o
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-rm -f $@
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ln $< $@
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# These extra files are sometimes expected by system standard linking
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# procedures, but we have nothing for them to do. So compile empty files.
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$(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
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cp /dev/null $(@:.o=.c)
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$(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
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rm -f $(@:.o=.c)
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