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glibc/glibc-stap.patch

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Break systemtap patches out of glibc-fedora.patch into glibc-stap.patch
2012-01-26 04:42:59 +00:00
diff -Nrup a/scripts/check-local-headers.sh b/scripts/check-local-headers.sh
--- a/scripts/check-local-headers.sh 2012-01-01 05:16:32.000000000 -0700
+++ b/scripts/check-local-headers.sh 2012-01-01 20:41:26.683439836 -0700
@@ -29,7 +29,7 @@ exec ${AWK} -v includedir="$includedir"
BEGIN {
status = 0
exclude = "^" includedir \
- "/(asm[-/]|linux/|selinux/|gd|nss3/|sys/capability\\.h|libaudit\\.h)"
+ "/(asm[-/]|linux/|selinux/|gd|nss3/|sys/capability\\.h|libaudit\\.h|sys/sdt(-config)?\\.h))"
}
/^[^ ]/ && $1 ~ /.*:/ { obj = $1 }
{
diff -Nrup a/sysdeps/i386/__longjmp.S b/sysdeps/i386/__longjmp.S
--- a/sysdeps/i386/__longjmp.S 2012-01-01 05:16:32.000000000 -0700
+++ b/sysdeps/i386/__longjmp.S 2012-01-01 20:41:26.686439835 -0700
@@ -1,5 +1,5 @@
/* longjmp for i386.
- Copyright (C) 1995-1998,2000,2002,2005,2006,2009
+ Copyright (C) 1995-1998,2000,2002,2005,2006,2009,2011
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -21,6 +21,7 @@
#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
+#include <stap-probe.h>
.text
ENTRY (__longjmp)
@@ -33,6 +34,7 @@ ENTRY (__longjmp)
movl (JB_SP*4)(%eax), %ecx
PTR_DEMANGLE (%edx)
PTR_DEMANGLE (%ecx)
+ LIBC_PROBE (longjmp, 3, 4@%eax, -4@8(%esp), 4@%edx)
cfi_def_cfa(%eax, 0)
cfi_register(%eip, %edx)
cfi_register(%esp, %ecx)
@@ -50,6 +52,7 @@ ENTRY (__longjmp)
cfi_restore(%edi)
cfi_restore(%ebp)
+ LIBC_PROBE (longjmp_target, 3, 4@%eax, -4@8(%esp), 4@%edx)
movl 8(%esp), %eax /* Second argument is return value. */
movl %ecx, %esp
#else
@@ -57,12 +60,14 @@ ENTRY (__longjmp)
movl 8(%esp), %eax /* Second argument is return value. */
/* Save the return address now. */
movl (JB_PC*4)(%ecx), %edx
+ LIBC_PROBE (longjmp, 3, 4@%ecx, -4@%eax, 4@%edx)
/* Restore registers. */
movl (JB_BX*4)(%ecx), %ebx
movl (JB_SI*4)(%ecx), %esi
movl (JB_DI*4)(%ecx), %edi
movl (JB_BP*4)(%ecx), %ebp
movl (JB_SP*4)(%ecx), %esp
+ LIBC_PROBE (longjmp_target, 3, 4@%ecx, -4@%ecx, 4@%edx)
#endif
/* Jump to saved PC. */
jmp *%edx
diff -Nrup a/sysdeps/i386/bsd-_setjmp.S b/sysdeps/i386/bsd-_setjmp.S
--- a/sysdeps/i386/bsd-_setjmp.S 2012-01-01 05:16:32.000000000 -0700
+++ b/sysdeps/i386/bsd-_setjmp.S 2012-01-01 20:41:26.686439835 -0700
@@ -1,5 +1,6 @@
/* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'. i386 version.
- Copyright (C) 1994-1997,2000-2002,2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 1994-1997,2000-2002,2005,2006,2011
+ 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
@@ -25,6 +26,7 @@
#include <jmpbuf-offsets.h>
#include "bp-sym.h"
#include "bp-asm.h"
+#include <stap-probe.h>
#define PARMS LINKAGE /* no space for saved regs */
#define JMPBUF PARMS
@@ -47,6 +49,7 @@ ENTRY (BP_SYM (_setjmp))
#endif
movl %ecx, (JB_SP*4)(%edx)
movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
+ LIBC_PROBE (setjmp, 3, 4@%edx, -4@$0, 4@%ecx)
#ifdef PTR_MANGLE
PTR_MANGLE (%ecx)
#endif
diff -Nrup a/sysdeps/i386/bsd-setjmp.S b/sysdeps/i386/bsd-setjmp.S
--- a/sysdeps/i386/bsd-setjmp.S 2012-01-01 05:16:32.000000000 -0700
+++ b/sysdeps/i386/bsd-setjmp.S 2012-01-01 20:41:26.687439834 -0700
@@ -1,5 +1,6 @@
/* BSD `setjmp' entry point to `sigsetjmp (..., 1)'. i386 version.
- Copyright (C) 1994-1997,2000,2001,2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 1994-1997,2000,2001,2005,2006,2011
+ 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
@@ -25,6 +26,7 @@
#include <jmpbuf-offsets.h>
#include "bp-sym.h"
#include "bp-asm.h"
+#include <stap-probe.h>
#define PARMS LINKAGE /* no space for saved regs */
#define JMPBUF PARMS
@@ -49,6 +51,7 @@ ENTRY (BP_SYM (setjmp))
#endif
movl %ecx, (JB_SP*4)(%eax)
movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
+ LIBC_PROBE (setjmp, 3, 4@%eax, -4@$1, 4@%ecx)
#ifdef PTR_MANGLE
PTR_MANGLE (%ecx)
#endif
diff -Nrup a/sysdeps/i386/setjmp.S b/sysdeps/i386/setjmp.S
--- a/sysdeps/i386/setjmp.S 2012-01-01 05:16:32.000000000 -0700
+++ b/sysdeps/i386/setjmp.S 2012-01-01 20:41:26.687439834 -0700
@@ -1,5 +1,5 @@
/* setjmp for i386.
- Copyright (C) 1995,1996,1997,2000,2001,2005,2006
+ Copyright (C) 1995,1996,1997,2000,2001,2005,2006,2011
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -23,6 +23,7 @@
#include <asm-syntax.h>
#include "bp-sym.h"
#include "bp-asm.h"
+#include <stap-probe.h>
#define PARMS LINKAGE /* no space for saved regs */
#define JMPBUF PARMS
@@ -44,6 +45,7 @@ ENTRY (BP_SYM (__sigsetjmp))
#endif
movl %ecx, (JB_SP*4)(%eax)
movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
+ LIBC_PROBE (setjmp, 3, 4@%eax, -4@SIGMSK(%esp), 4@%ecx)
#ifdef PTR_MANGLE
PTR_MANGLE (%ecx)
#endif
diff -Nrup a/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S b/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S
--- a/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S 2012-01-01 05:16:32.000000000 -0700
+++ b/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S 2012-01-01 20:41:26.699439832 -0700
@@ -1,4 +1,5 @@
-/* Copyright (C) 2001,2004,2005,2006,2009 Free Software Foundation, Inc.
+/* Copyright (C) 2001,2004,2005,2006,2009,2011
+ 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
@@ -19,6 +20,7 @@
#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
+#include <stap-probe.h>
.section .rodata.str1.1,"aMS",@progbits,1
@@ -79,7 +81,9 @@ ENTRY (____longjmp_chk)
cfi_adjust_cfa_offset(-12)
movl 4(%esp), %ecx
-.Lok: /* We add unwind information for the target here. */
+.Lok:
+ LIBC_PROBE (longjmp, 3, 4@%ecx, -4@8(%esp), 4@%edx)
+ /* We add unwind information for the target here. */
cfi_def_cfa(%ecx, 0)
cfi_register(%eip, %edx)
cfi_register(%esp, %edi)
@@ -102,5 +106,6 @@ ENTRY (____longjmp_chk)
cfi_restore(%ebp)
/* Jump to saved PC. */
+ LIBC_PROBE (longjmp_target, 3, 4@%ecx, -4@%eax, 4@%edx)
jmp *%edx
END (____longjmp_chk)
diff -Nrup a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S
--- a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S 2012-01-01 05:16:32.000000000 -0700
+++ b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S 2012-01-01 20:41:26.703439831 -0700
@@ -19,6 +19,7 @@
#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
+#include <stap-probe.h>
.section .rodata.str1.1,"aMS",@progbits,1
.type longjmp_msg,@object
@@ -94,7 +95,9 @@ ENTRY(____longjmp_chk)
movl %ebx, %esi
cfi_restore (%rsi)
-.Lok: /* We add unwind information for the target here. */
+.Lok:
+ LIBC_PROBE (longjmp, 3, 8@%rdi, -4@%esi, 8@%rdx)
+ /* We add unwind information for the target here. */
cfi_def_cfa(%rdi, 0)
cfi_register(%rsp,%r8)
cfi_register(%rbp,%r9)
@@ -113,5 +116,6 @@ ENTRY(____longjmp_chk)
movl %esi, %eax
movq %r8,%rsp
movq %r9,%rbp
+ LIBC_PROBE (longjmp_target, 3, 8@%rdi, -4@%eax, 8@%rdx)
jmpq *%rdx
END (____longjmp_chk)
diff -Nrup a/sysdeps/x86_64/__longjmp.S b/sysdeps/x86_64/__longjmp.S
--- a/sysdeps/x86_64/__longjmp.S 2012-01-01 05:16:32.000000000 -0700
+++ b/sysdeps/x86_64/__longjmp.S 2012-01-01 20:41:26.703439831 -0700
@@ -1,4 +1,4 @@
-/* Copyright (C) 2001,2004,2005,2006,2009 Free Software Foundation, Inc.
+/* Copyright (C) 2001,2004,2005,2006,2009,2011 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
@@ -19,6 +19,7 @@
#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
+#include <stap-probe.h>
/* Jump to the position specified by ENV, causing the
setjmp call there to return VAL, or 1 if VAL is 0.
@@ -34,6 +35,7 @@ ENTRY(__longjmp)
PTR_DEMANGLE (%r9)
PTR_DEMANGLE (%rdx)
#endif
+ LIBC_PROBE (longjmp, 3, 8@%rdi, -4@%esi, 8@%rdx)
/* We add unwind information for the target here. */
cfi_def_cfa(%rdi, 0)
cfi_register(%rsp,%r8)
@@ -53,5 +55,6 @@ ENTRY(__longjmp)
mov %esi, %eax
movq %r8,%rsp
movq %r9,%rbp
+ LIBC_PROBE (longjmp_target, 3, 8@%rdi, -4@%eax, 8@%rdx)
jmpq *%rdx
END (__longjmp)
diff -Nrup a/sysdeps/x86_64/setjmp.S b/sysdeps/x86_64/setjmp.S
--- a/sysdeps/x86_64/setjmp.S 2012-01-01 05:16:32.000000000 -0700
+++ b/sysdeps/x86_64/setjmp.S 2012-01-01 20:41:26.704439831 -0700
@@ -1,5 +1,5 @@
/* setjmp for x86-64.
- Copyright (C) 2001, 2003, 2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2001,2003,2005,2006,2011 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
@@ -20,6 +20,7 @@
#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
+#include <stap-probe.h>
ENTRY (__sigsetjmp)
/* Save registers. */
@@ -41,6 +42,7 @@ ENTRY (__sigsetjmp)
#endif
movq %rdx, (JB_RSP*8)(%rdi)
movq (%rsp), %rax /* Save PC we are returning to now. */
+ LIBC_PROBE (setjmp, 3, 8@%rdi, -4@%esi, 8@%rax)
#ifdef PTR_MANGLE
PTR_MANGLE (%rax)
#endif
diff -Nrup a/include/stap-probe.h b/include/stap-probe.h
--- a/include/stap-probe.h 1969-12-31 17:00:00.000000000 -0700
+++ b/include/stap-probe.h 2012-01-01 20:41:26.646439841 -0700
@@ -0,0 +1,140 @@
+/* Macros for defining Systemtap <sys/sdt.h> static probe points.
+ Copyright (C) 2011 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _STAP_PROBE_H
+#define _STAP_PROBE_H 1
+
+#ifdef USE_STAP_PROBE
+
+# include <sys/sdt.h>
+
+/* Our code uses one macro LIBC_PROBE (name, n, arg1, ..., argn).
+
+ Without USE_STAP_PROBE, that does nothing but evaluates all
+ its arguments (to prevent bit rot, unlike e.g. assert).
+
+ Systemtap's header defines the macros STAP_PROBE (provider, name) and
+ STAP_PROBEn (provider, name, arg1, ..., argn). For "provider" we paste
+ in the IN_LIB name (libc, libpthread, etc.) automagically. */
+
+# ifndef NOT_IN_libc
+# define IN_LIB libc
+# elif !defined IN_LIB
+/* This is intentionally defined with extra unquoted commas in it so
+ that macro substitution will bomb out when it is used. We don't
+ just use #error here, so that this header can be included by
+ other headers that use LIBC_PROBE inside their own macros. We
+ only want such headers to fail to compile if those macros are
+ actually used in a context where IN_LIB has not been defined. */
+# define IN_LIB ,,,missing -DIN_LIB=... -- not extra-lib.mk?,,,
+# endif
+
+# define LIBC_PROBE(name, n, ...) \
+ LIBC_PROBE_1 (IN_LIB, name, n, ## __VA_ARGS__)
+
+# define LIBC_PROBE_1(lib, name, n, ...) \
+ STAP_PROBE##n (lib, name, ## __VA_ARGS__)
+
+# define STAP_PROBE0 STAP_PROBE
+
+# define LIBC_PROBE_ASM(name, template) \
+ STAP_PROBE_ASM (IN_LIB, name, template)
+
+# define LIBC_PROBE_ASM_OPERANDS STAP_PROBE_ASM_OPERANDS
+
+#else /* Not USE_STAP_PROBE. */
+
+# ifndef __ASSEMBLER__
+# define LIBC_PROBE(name, n, ...) DUMMY_PROBE##n (__VA_ARGS__)
+# else
+# define LIBC_PROBE(name, n, ...) /* Nothing. */
+# endif
+
+# define LIBC_PROBE_ASM(name, template) /* Nothing. */
+# define LIBC_PROBE_ASM_OPERANDS(n, ...) /* Nothing. */
+
+/* This silliness lets us evaluate all the arguments for each arity
+ of probe. My kingdom for a real macro system. */
+
+# define DUMMY_PROBE0() do {} while (0)
+# define DUMMY_PROBE1(a1) do {} while ((void) (a1), 0)
+# define DUMMY_PROBE2(a1, a2) do {} while ((void) (a1), \
+ (void) (a2), 0)
+# define DUMMY_PROBE3(a1, a2, a3) do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), 0)
+# define DUMMY_PROBE4(a1, a2, a3, a4) do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), 0)
+# define DUMMY_PROBE5(a1, a2, a3, a4, a5) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), 0)
+# define DUMMY_PROBE6(a1, a2, a3, a4, a5, a6) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), 0)
+# define DUMMY_PROBE7(a1, a2, a3, a4, a5, a6, a7) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), \
+ (void) (a7), 0)
+# define DUMMY_PROBE8(a1, a2, a3, a4, a5, a6, a7, a8) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), \
+ (void) (a7), \
+ (void) (a8), 0)
+# define DUMMY_PROBE9(a1, a2, a3, a4, a5, a6, a7, a8, a9) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), \
+ (void) (a7), \
+ (void) (a8), \
+ (void) (a9), 0)
+# define DUMMY_PROBE10(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10) \
+ do {} while ((void) (a1), \
+ (void) (a2), \
+ (void) (a3), \
+ (void) (a4), \
+ (void) (a5), \
+ (void) (a6), \
+ (void) (a7), \
+ (void) (a8), \
+ (void) (a9), \
+ (void) (a10), 0)
+
+#endif /* USE_STAP_PROBE. */
+
+#endif /* stap-probe.h */
diff -Nrup a/config.h.in b/config.h.in
--- a/config.h.in 2012-01-01 05:16:32.000000000 -0700
+++ b/config.h.in 2012-01-01 20:41:26.632439843 -0700
@@ -187,6 +187,9 @@
/* Define if `.ctors' and `.dtors' sections shouldn't be used. */
#undef NO_CTORS_DTORS_SECTIONS
+/* Define if Systemtap <sys/sdt.h> probes should be defined. */
+#undef USE_STAP_PROBE
+
/*
*/
diff -Nrup a/configure b/configure
--- a/configure 2012-01-01 20:40:50.423446105 -0700
+++ b/configure 2012-01-01 20:41:26.634439843 -0700
@@ -791,6 +791,7 @@ enable_kernel
enable_all_warnings
enable_multi_arch
enable_nss_crypt
+enable_systemtap
with_cpu
'
ac_precious_vars='build_alias
@@ -1450,6 +1451,7 @@ Optional Features:
--enable-multi-arch enable single DSO with optimizations for multiple
architectures
--enable-nss-crypt enable libcrypt to use nss
+ --enable-systemtap enable systemtap static probe points [default=no]
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
@@ -3804,6 +3806,51 @@ else
fi
+# Check whether --enable-systemtap was given.
+if test "${enable_systemtap+set}" = set; then :
+ enableval=$enable_systemtap; systemtap=$enableval
+else
+ systemtap=no
+fi
+
+if test x$systemtap != xno; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for systemtap static probe support" >&5
+$as_echo_n "checking for systemtap static probe support... " >&6; }
+if test "${libc_cv_sdt+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ old_CFLAGS="$CFLAGS"
+ CFLAGS="-std=gnu99 $CFLAGS"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+#include <sys/sdt.h>
+void foo (int i, void *p)
+{
+ asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
+ :: STAP_PROBE_ASM_OPERANDS (2, i, p));
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ libc_cv_sdt=yes
+else
+ libc_cv_sdt=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ CFLAGS="$old_CFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_sdt" >&5
+$as_echo "$libc_cv_sdt" >&6; }
+ if test $libc_cv_sdt = yes; then
+ $as_echo "#define USE_STAP_PROBE 1" >>confdefs.h
+
+ else
+ { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "systemtap support needs sys/sdt.h with asm support
+See \`config.log' for more details" "$LINENO" 5; }
+ fi
+fi
+
# The way shlib-versions is used to generate soversions.mk uses a
# fairly simplistic model for name recognition that can't distinguish
# i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
diff -Nrup a/configure.in b/configure.in
--- a/configure.in 2012-01-01 05:16:32.000000000 -0700
+++ b/configure.in 2012-01-01 20:41:26.635439843 -0700
@@ -290,6 +290,29 @@ else
fi
AC_SUBST(libc_cv_nss_crypt)
+AC_ARG_ENABLE([systemtap],
+ [AS_HELP_STRING([--enable-systemtap],
+ [enable systemtap static probe points @<:@default=no@:>@])],
+ [systemtap=$enableval],
+ [systemtap=no])
+if test x$systemtap != xno; then
+ AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
+ old_CFLAGS="$CFLAGS"
+ CFLAGS="-std=gnu99 $CFLAGS"
+ AC_COMPILE_IFELSE([#include <sys/sdt.h>
+void foo (int i, void *p)
+{
+ asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
+ :: STAP_PROBE_ASM_OPERANDS (2, i, p));
+}], [libc_cv_sdt=yes], [libc_cv_sdt=no])
+ CFLAGS="$old_CFLAGS"])
+ if test $libc_cv_sdt = yes; then
+ AC_DEFINE([USE_STAP_PROBE])
+ else
+ AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
+ fi
+fi
+
# The way shlib-versions is used to generate soversions.mk uses a
# fairly simplistic model for name recognition that can't distinguish
# i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
diff -Nrup a/extra-lib.mk b/extra-lib.mk
--- a/extra-lib.mk 2012-01-01 05:16:32.000000000 -0700
+++ b/extra-lib.mk 2012-01-01 20:41:26.644439841 -0700
@@ -101,4 +101,4 @@ ifneq (,$(cpp-srcs-left))
include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
endif
-CPPFLAGS-$(lib) := -DNOT_IN_libc=1 -DIS_IN_$(lib)=1
+CPPFLAGS-$(lib) := -DNOT_IN_libc=1 -DIS_IN_$(lib)=1 -DIN_LIB=$(lib)
diff -Nrup a/elf/Makefile b/elf/Makefile
--- a/elf/Makefile 2012-01-01 05:16:32.000000000 -0700
+++ b/elf/Makefile 2012-01-01 20:41:26.637439843 -0700
@@ -505,7 +506,8 @@ CFLAGS-ldconfig.c = $(SYSCONF-FLAGS) -D'
CFLAGS-dl-cache.c = $(SYSCONF-FLAGS)
CFLAGS-cache.c = $(SYSCONF-FLAGS)
-CPPFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),-DNOT_IN_libc=1 -DIS_IN_rtld=1)
+CPPFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),\
+ -DNOT_IN_libc=1 -DIS_IN_rtld=1 -DIN_LIB=rtld)
test-modules = $(addprefix $(objpfx),$(addsuffix .so,$(strip $(modules-names))))
generated += $(addsuffix .so,$(strip $(modules-names)))
diff -Nrup a/elf/rtld-Rules b/elf/rtld-Rules
--- a/elf/rtld-Rules 2012-01-01 05:16:32.000000000 -0700
+++ b/elf/rtld-Rules 2012-01-01 20:41:26.642439841 -0700
@@ -1,7 +1,7 @@
# Subroutine makefile for compiling libc modules linked into dynamic linker.
# Copyright (C) 2002,2003,2005,2006,2008,2010,2011
-# Free Software Foundation, Inc.
+# 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
@@ -131,6 +131,6 @@ ifdef rtld-depfiles
endif
# This here is the whole point of all the shenanigans.
-rtld-CPPFLAGS := -DNOT_IN_libc=1 -DIS_IN_rtld=1
+rtld-CPPFLAGS := -DNOT_IN_libc=1 -DIS_IN_rtld=1 -DIN_LIB=rtld
endif
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