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authorRoland McGrath <roland@gnu.org>1995-02-21 06:02:58 +0000
committerRoland McGrath <roland@gnu.org>1995-02-21 06:02:58 +0000
commit37f91d336d8d93b1416c121627ffe88e548b251d (patch)
treea97e2e6f7a060d404c43bbc9ae12f0685f35f1fd /csu
parent41d43dbce0b5df750abf709a793195471b4c55e8 (diff)
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Tue Feb 21 00:10:50 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* csu/Makefile (crtstuff): New variable consolidates crti, crtn; add crti_s, crtn_s. (install-lib, extra-objs, generated-, omit-deps): Use that. (initfini): New canned sequence, broken out of crt[in].s rule. (crt[in].s rule): Use it. (crt[in]_s.s): New rule. * csu/initfini.c (GLOBAL): New macro; define it to empty if undefined. (_init, _fini): Use GLOBAL as storage class. Add self reference to avoid GCC optimizing out the functions. * Makefile (headers): Remove $(stddef.h). * Makeconfig (stddef.h): Variable removed; now require gcc version >= 2.2. * stddef.h: File removed. Mon Feb 20 19:42:31 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu> * sysdeps/unix/bsd/ultrix4/mips/start.S: Remove `__environ' definition. * sysdeps/unix/bsd/osf1/alpha/start.S: Likewise. * stdlib/strtod.c: Allow the string to start with a decimal point without a leading zero.
Diffstat (limited to 'csu')
-rw-r--r--csu/Makefile48
-rw-r--r--csu/initfini.c17
2 files changed, 46 insertions, 19 deletions
diff --git a/csu/Makefile b/csu/Makefile
index 6de77b7..4943087 100644
--- a/csu/Makefile
+++ b/csu/Makefile
@@ -39,33 +39,51 @@ all: # Make this the default target; it will be defined in Rules.
include ../Makeconfig
ifneq ($(elf),yes)
+
# When not using ELF, there is just one startfile, called crt0.o.
start-installed-name = crt0.o
+
else
+
# In the ELF universe, crt0.o is called crt1.o, and there are
# some additional bizarre files.
start-installed-name = crt1.o
-install-lib += crti.o crtn.o
-extra-objs += crti.o crtn.o
-generated += crti.s crtn.s
-omit-deps += crti crtn
+
+# These are the special initializer/finalizer files. They are always the
+# first and last file in the link. crti.o ... crtn.o are used for normal
+# linking; they define the global "functions" _init and _fini to run the
+# .init and .fini sections. crti_s.o ... crtn_s.o are for making shared
+# library objects; they put the prologue/epilogue code into the .init and
+# .fini sections, but define no global symbols.
+crtstuff = crti crtn crti_s crtn_s
+
+install-lib += $(crtstuff:=.o)
+extra-objs += $(crtstuff:=.o)
+generated += $(crtstuff:=.s)
+omit-deps += $(crtstuff)
# Compile initfini.c to assembly code, which contains embedded shell
# commands that prodice crti.s-new and crtn.s-new when run. We need to
# disable emission of .size directives and debugging information, since
# they will get confused by the splitting of the output we do.
-$(objpfx)cr%i.s $(objpfx)cr%n.s: initfini.c
- -rm -f $(objpfx)crtcommon.tmp
- (echo 'cat > crtcommon.tmp <<\EOF_common'; \
- $(CC) $< $(CPPFLAGS) $(CFLAGS) -finhibit-size-directive -g0 -S -o -; \
- echo 'EOF_common') | (cd $(@D); $(SHELL))
- cat $(objpfx)crtcommon.tmp >> $(objpfx)crti.s-new
- cat $(objpfx)crtcommon.tmp >> $(objpfx)crtn.s-new
- rm -f $(objpfx)crtcommon.tmp
- mv -f $(objpfx)crti.s-new $(objpfx)crti.s
- mv -f $(objpfx)crtn.s-new $(objpfx)crtn.s
-endif
+$(objpfx)cr%i.s $(objpfx)cr%n.s: initfini.c; $(initfini)
+$(objpfx)cr%i_s.s $(objpfx)cr%n_s.s: initfini.c; $(initfini)
+
+define initfini
+-rm -f $(objpfx)crtcommon.tmp
+(echo 'cat > crtcommon.tmp <<\EOF_common'; \
+ $(CC) $< $(CPPFLAGS) $(CFLAGS) \
+ $(patsubst %,-DGLOBAL=static,$(filter %_s.s,$@)) \
+ -finhibit-size-directive -g0 -S -o -; \
+ echo 'EOF_common') | (cd $(@D); $(SHELL))
+cat $(objpfx)crtcommon.tmp >> $(objpfx)crti.s-new
+cat $(objpfx)crtcommon.tmp >> $(objpfx)crtn.s-new
+rm -f $(objpfx)crtcommon.tmp
+mv -f $(objpfx)crti.s-new $(subst crtn,crti,$@)
+mv -f $(objpfx)crtn.s-new $(subst crti,crtn,$@)
+endef
+endif
include ../Rules
diff --git a/csu/initfini.c b/csu/initfini.c
index ea16e62..bfd120b 100644
--- a/csu/initfini.c
+++ b/csu/initfini.c
@@ -34,11 +34,18 @@ Cambridge, MA 02139, USA. */
#include <stdlib.h>
+/* We are compiled with -DGLOBAL=static to generate the versions used for
+ shared libraries' .init and .fini sections, which do not have entry
+ point symbols. */
+#ifndef GLOBAL
+#define GLOBAL
+#endif
+
/* These declarations make the functions go in the right sections when
we define them below. GCC syntax does not allow the attribute
specifications to be in the function definitions themselves. */
-void _init (void) __attribute__ ((section (".init")));
-void _fini (void) __attribute__ ((section (".fini")));
+GLOBAL void _init (void) __attribute__ ((section (".init")));
+GLOBAL void _fini (void) __attribute__ ((section (".fini")));
/* End the here document containing the initial common code.
Then move the output file crtcommon.tmp to crti.s-new and crtn.s-new. */
@@ -48,9 +55,10 @@ cp -f crti.s-new crtn.s-new");
/* Append the .init prologue to crti.s-new. */
asm ("cat >> crti.s-new <<\\EOF.crti.init");
-void
+GLOBAL void
_init (void)
{
+ (void) &_init; /* Don't optimize out the function! */
/* End the here document containing the .init prologue code.
Then fetch the .section directive just written and append that
to crtn.s-new, followed by the function epilogue. */
@@ -66,9 +74,10 @@ asm ("\nEOF.crtn.init\
\n\
cat >> crti.s-new <<\\EOF.crti.fini");
-void
+GLOBAL void
_fini (void)
{
+ (void) &_fini; /* Don't optimize out the function! */
/* End the here document containing the .fini prologue code.
Then fetch the .section directive just written and append that
to crtn.s-new, followed by the function epilogue. */