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Remove NO_CTORS_DTORS_SECTIONS macro
This was originally added to support binutils older than version 2.22: <https://sourceware.org/ml/libc-alpha/2010-12/msg00051.html> Since 2.22 is older than the minimum required binutils version for building glibc, we no longer need this. (The changes do not impact the statically linked startup code.)
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@ -690,8 +690,7 @@ $(common-objpfx)linkobj/libc.so: link-libc-deps = # empty
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# Use our own special initializer and finalizer files for the libc.so
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# Use our own special initializer and finalizer files for the libc.so
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# libraries.
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# libraries.
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$(common-objpfx)libc.so: $(elf-objpfx)soinit.os \
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$(common-objpfx)libc.so: $(common-objpfx)libc_pic.os$(libc_pic_clean) \
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$(common-objpfx)libc_pic.os$(libc_pic_clean) \
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$(elf-objpfx)sofini.os \
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$(elf-objpfx)sofini.os \
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$(elf-objpfx)interp.os \
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$(elf-objpfx)interp.os \
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$(elf-objpfx)ld.so \
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$(elf-objpfx)ld.so \
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@ -699,8 +698,7 @@ $(common-objpfx)libc.so: $(elf-objpfx)soinit.os \
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$(build-shlib)
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$(build-shlib)
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$(call after-link,$@)
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$(call after-link,$@)
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$(common-objpfx)linkobj/libc.so: $(elf-objpfx)soinit.os \
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$(common-objpfx)linkobj/libc.so: $(common-objpfx)linkobj/libc_pic.a \
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$(common-objpfx)linkobj/libc_pic.a \
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$(elf-objpfx)sofini.os \
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$(elf-objpfx)sofini.os \
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$(elf-objpfx)interp.os \
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$(elf-objpfx)interp.os \
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$(elf-objpfx)ld.so \
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$(elf-objpfx)ld.so \
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@ -157,9 +157,6 @@
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/* Define if multi-arch DSOs should be generated. */
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/* Define if multi-arch DSOs should be generated. */
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#undef USE_MULTIARCH
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#undef USE_MULTIARCH
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/* Define if `.ctors' and `.dtors' sections shouldn't be used. */
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#undef NO_CTORS_DTORS_SECTIONS
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/* Define if obsolete RPC code should be made available for user-level code
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/* Define if obsolete RPC code should be made available for user-level code
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to link against. */
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to link against. */
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#undef LINK_OBSOLETE_RPC
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#undef LINK_OBSOLETE_RPC
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53
configure
vendored
53
configure
vendored
@ -5753,59 +5753,6 @@ if test $libc_cv_have_sdata_section = yes; then
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fi
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to use .ctors/.dtors header and trailer" >&5
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$as_echo_n "checking whether to use .ctors/.dtors header and trailer... " >&6; }
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if ${libc_cv_ctors_header+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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libc_cv_ctors_header=yes
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cat > conftest.c <<EOF
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int _start (void) { return 0; }
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int __start (void) { return 0; }
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__attribute__ ((constructor)) void ctor (void) { asm (""); }
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__attribute__ ((destructor)) void dtor (void) { asm (""); }
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EOF
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if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -o conftest
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conftest.c -static -nostartfiles -nostdlib
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1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then :
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if $READELF -WS conftest$ac_exeext | $AWK '
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{ gsub(/\[ */, "[") }
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$2 == ".ctors" || $2 == ".dtors" {
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size = strtonum("0x" $6)
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align = strtonum("0x" $NF)
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seen[$2] = 1
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stub[$2] = size == align * 2
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}
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END {
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ctors_ok = !seen[".ctors"] || stub[".ctors"]
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dtors_ok = !seen[".dtors"] || stub[".dtors"]
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exit ((ctors_ok && dtors_ok) ? 0 : 1)
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}
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'; then :
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libc_cv_ctors_header=no
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fi
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else
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as_fn_error $? "missing __attribute__ ((constructor)) support??" "$LINENO" 5
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fi
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rm -f conftest*
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ctors_header" >&5
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$as_echo "$libc_cv_ctors_header" >&6; }
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if test $libc_cv_ctors_header = no; then
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$as_echo "#define NO_CTORS_DTORS_SECTIONS 1" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for libunwind-support in compiler" >&5
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for libunwind-support in compiler" >&5
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$as_echo_n "checking for libunwind-support in compiler... " >&6; }
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$as_echo_n "checking for libunwind-support in compiler... " >&6; }
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if ${libc_cv_cc_with_libunwind+:} false; then :
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if ${libc_cv_cc_with_libunwind+:} false; then :
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30
configure.ac
30
configure.ac
@ -1251,36 +1251,6 @@ if test $libc_cv_have_sdata_section = yes; then
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AC_DEFINE(HAVE_SDATA_SECTION)
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AC_DEFINE(HAVE_SDATA_SECTION)
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fi
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fi
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AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
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libc_cv_ctors_header, [dnl
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libc_cv_ctors_header=yes
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LIBC_TRY_LINK_STATIC([
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__attribute__ ((constructor)) void ctor (void) { asm (""); }
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__attribute__ ((destructor)) void dtor (void) { asm (""); }
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],
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[dnl
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AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
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{ gsub(/\@<:@ */, "@<:@") }
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$2 == ".ctors" || $2 == ".dtors" {
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size = strtonum("0x" $6)
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align = strtonum("0x" $NF)
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seen@<:@$2@:>@ = 1
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stub@<:@$2@:>@ = size == align * 2
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}
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END {
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ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
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dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
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exit ((ctors_ok && dtors_ok) ? 0 : 1)
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}
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'], [libc_cv_ctors_header=no])
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], [dnl
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AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
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])
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])
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if test $libc_cv_ctors_header = no; then
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AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
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fi
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AC_CACHE_CHECK(for libunwind-support in compiler,
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AC_CACHE_CHECK(for libunwind-support in compiler,
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libc_cv_cc_with_libunwind, [
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libc_cv_cc_with_libunwind, [
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cat > conftest.c <<EOF
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cat > conftest.c <<EOF
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@ -73,10 +73,6 @@ _init_first (int argc, char **argv, char **envp)
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#endif
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#endif
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__init_misc (argc, argv, envp);
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__init_misc (argc, argv, envp);
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#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
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__libc_global_ctors ();
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#endif
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}
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}
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/* This function is defined here so that if this file ever gets into
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/* This function is defined here so that if this file ever gets into
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@ -98,7 +98,7 @@ ld-map = $(common-objpfx)ld.map
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endif
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endif
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ifeq (yes,$(build-shared))
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ifeq (yes,$(build-shared))
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extra-objs = $(all-rtld-routines:%=%.os) soinit.os sofini.os interp.os
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extra-objs = $(all-rtld-routines:%=%.os) sofini.os interp.os
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generated += librtld.os dl-allobjs.os ld.so ldd
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generated += librtld.os dl-allobjs.os ld.so ldd
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install-others = $(inst_rtlddir)/$(rtld-installed-name)
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install-others = $(inst_rtlddir)/$(rtld-installed-name)
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install-bin-script = ldd
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install-bin-script = ldd
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12
elf/sofini.c
12
elf/sofini.c
@ -1,15 +1,3 @@
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/* Finalizer module for ELF shared C library. This provides terminating
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null pointer words in the `.ctors' and `.dtors' sections. */
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#ifndef NO_CTORS_DTORS_SECTIONS
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static void (*const __CTOR_END__[1]) (void)
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__attribute__ ((used, section (".ctors")))
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= { 0 };
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static void (*const __DTOR_END__[1]) (void)
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__attribute__ ((used, section (".dtors")))
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= { 0 };
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#endif
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/* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
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/* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
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this would be the 'length' field in a real FDE. */
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this would be the 'length' field in a real FDE. */
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43
elf/soinit.c
43
elf/soinit.c
@ -1,43 +0,0 @@
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/* Initializer module for building the ELF shared C library. This file and
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sofini.c do the work normally done by crtbeginS.o and crtendS.o, to wrap
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the `.ctors' and `.dtors' sections so the lists are terminated, and
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calling those lists of functions. */
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#ifndef NO_CTORS_DTORS_SECTIONS
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# include <stdlib.h>
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static void (*const __CTOR_LIST__[1]) (void)
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__attribute__ ((used, section (".ctors")))
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= { (void (*) (void)) -1 };
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static void (*const __DTOR_LIST__[1]) (void)
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__attribute__ ((used, section (".dtors")))
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= { (void (*) (void)) -1 };
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static inline void
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run_hooks (void (*const list[]) (void))
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{
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while (*++list)
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(**list) ();
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}
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/* This function will be called from _init_first in init-first.c. */
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void
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__libc_global_ctors (void)
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{
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/* Call constructor functions. */
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run_hooks (__CTOR_LIST__);
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}
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/* This function becomes the DT_FINI termination function
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for the C library. */
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void
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__libc_fini (void)
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{
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/* Call destructor functions. */
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run_hooks (__DTOR_LIST__);
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}
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void (*_fini_ptr) (void) __attribute__ ((section (".fini_array")))
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= &__libc_fini;
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#endif
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/* Initialize the `__libc_enable_secure' flag. */
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/* Initialize the `__libc_enable_secure' flag. */
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extern void __libc_init_secure (void);
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extern void __libc_init_secure (void);
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/* This function will be called from _init_first in init-first.c. */
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extern void __libc_global_ctors (void);
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/* Discover the tick frequency of the machine if something goes wrong,
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/* Discover the tick frequency of the machine if something goes wrong,
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we return 0, an impossible hertz. */
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we return 0, an impossible hertz. */
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extern int __profile_frequency (void);
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extern int __profile_frequency (void);
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extern void __mach_init (void);
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extern void __mach_init (void);
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extern void __init_misc (int, char **, char **);
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extern void __init_misc (int, char **, char **);
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extern void __libc_global_ctors (void);
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unsigned long int __hurd_threadvar_stack_offset;
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unsigned long int __hurd_threadvar_stack_offset;
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unsigned long int __hurd_threadvar_stack_mask;
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unsigned long int __hurd_threadvar_stack_mask;
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@ -83,10 +82,6 @@ posixland_init (int argc, char **argv, char **envp)
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_dl_non_dynamic_init ();
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_dl_non_dynamic_init ();
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#endif
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#endif
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__init_misc (argc, argv, envp);
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__init_misc (argc, argv, envp);
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#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
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__libc_global_ctors ();
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#endif
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}
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}
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