Merge remote-tracking branch 'origin/hjl/abi' into hjl/x32/master

Conflicts:
	sysdeps/unix/sysv/linux/x86_64/Makefile

15 files changed, 191 insertions, 146 deletions

diff --git a/ChangeLog.abi b/ChangeLog.abi
new file mode 100644
index 0000000000..8a7e3ea247
--- /dev/null
+++ b/ChangeLog.abi
@@ -0,0 +1,55 @@
+2012-05-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* Makeconfig (abi-list-default-options): New macro.
+	(abi-list-default-condition): Likewise.
+	($(common-objpfx)soversions.mk): Remove WORDSIZE check. 
+	($(common-objpfx)gnu/lib-names.stmp): Generate from
+	abi-list-variants.
+	* Makefile (installed-stubs): Generate from abi-list-variants.
+	* include/stubs-biarch.h: Removed.
+	* scripts/lib-names.awk: Only handle one library at a time.
+	* scripts/soversions.awk: Remove WORDSIZE support.
+	* shlib-versions: Remove WORDSIZE.
+	* sysdeps/unix/sysv/linux/Makefile (syscall-list-variants):
+	Removed.
+	(syscall-list-default-condition): Likewise.
+	(syscall-list-includes): Renamed to ...
+	(abi-list-includes): This.
+	($(objpfx)bits/syscall%h $(objpfx)bits/syscall%d): Replace
+	syscall-list-* with abi-list-*.
+	* sysdeps/unix/sysv/linux/i386/Makefile (abi-list-includes): New
+	macro.
+	(default-abi): Likewise.
+	(abi-list-variants): Likewise.
+	(abi-list-32-options): Likewise.
+	(abi-list-32-condition): Likewise.
+	(abi-list-64-options): Likewise.
+	(abi-list-64-condition): Likewise.
+	(abi-list-x32-options): Likewise.
+	(abi-list-x32-condition): Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/64/Makefile: New file.	
+	* sysdeps/unix/sysv/linux/x86_64/Makefile (syscall-list-variants):
+	Removed.
+	(syscall-list-32-options): Likewise.
+	(syscall-list-32-condition): Likewise.
+	(syscall-list-64-options): Likewise.
+	(syscall-list-64-condition): Likewise.
+	(abi-list-variants): New macros.
+	(abi-list-includes): Likewise.
+	(abi-list-32-options): Likewise.
+	(abi-list-32-condition): Likewise.
+	(abi-list-64-options): Likewise.
+	(abi-list-64-condition): Likewise.
+	(abi-list-x32-options): Likewise.
+	(abi-list-x32-condition): Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/x32/Makefile (default-abi): New
+	macro.
+	* sysdeps/unix/sysv/linux/powerpc/Makefile (syscall-list-variants):
+	Renamed to ...
+	(abi-list-variants): This.
+	(syscall-list-32bit-*): Renamed to ...
+	(abi-list-32-*): This.
+	(syscall-list-64bit-*): Renamed to ...
+	(abi-list-64-*): This.
+	* sysdeps/unix/sysv/linux/s390/Makefile: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/Makefile: Likewise.
diff --git a/Makeconfig b/Makeconfig
index 3a09764dfa..4f9b9cf654 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -787,6 +787,21 @@ ifeq (yes, $(build-shared))
 	sed '/^[ 	]*#/d;/^[ 	]*$$/d' $< > $@T
 	mv -f $@T $@
 
+# If there is more than one syscall list for different architecture
+# variants, the CPU/shlib-versions should have an ABI-LIST entry with a
+# list of names for those variants, separated by `:', (e.g. 32:64), and,
+# for each variant, defines abi-list-$(variant)-options to be compiler
+# options to cause <asm/unistd.h> to define the desired list of
+# syscalls and abi-list-$(variant)-condition to be the condition
+# for those options to use in a C #if condition.
+# syscall-list-includes may be defined to a list of headers to include
+# in the generated header, if the default does not suffice.
+
+ifndef abi-list-variants
+abi-list-default-options :=
+abi-list-default-condition :=
+endif
+
 # Process the shlib-versions file, which tells us what shared library
 # version numbers to use when we install shared objects on this system.
 # We need to wait until $(subdirs) is complete.
@@ -812,8 +827,7 @@ $(common-objpfx)soversions.i: $(..)scripts/soversions.awk \
 	       -f $^ > $@T
 	mv -f $@T $@
 $(common-objpfx)soversions.mk: $(common-objpfx)soversions.i $(..)Makeconfig
-	(seen_DEFAULT=0; seen_WORDSIZE32=0; seen_WORDSIZE64=0; \
-	 while read which lib number setname; do \
+	(while read which lib number setname; do \
 	   eval seen_$$which=1; \
 	   test x"$$which" != xABI || echo abi-name = "$$lib"; \
 	   test x"$$which" = xDEFAULT || continue; \
@@ -824,12 +838,6 @@ $(common-objpfx)soversions.mk: $(common-objpfx)soversions.i $(..)Makeconfig
 		     echo "all-sonames+=$$lib=\$$($$lib.so-version)";;\
 	   esac; \
 	 done; \
-	 case "$$seen_DEFAULT$$seen_WORDSIZE32$$seen_WORDSIZE64" in \
-	   100) echo biarch = no;; \
-	   101) echo biarch = 32;; \
-	   ?1?) echo biarch = 64;; \
-	   *) echo >&2 BUG; exit 2;; \
-	 esac; \
 	 echo soversions.mk-done = t;) < $< > $@T; exit 0
 	mv -f $@T $@
 endif
@@ -846,8 +854,31 @@ $(common-objpfx)gnu/lib-names.h: $(common-objpfx)gnu/lib-names.stmp; @:
 $(common-objpfx)gnu/lib-names.stmp: $(..)scripts/lib-names.awk \
 				    $(common-objpfx)soversions.i
 	$(make-target-directory)
-	@rm -f ${@:stmp=T} $@
-	LC_ALL=C $(AWK) -f $^ > ${@:stmp=T}
+	{ \
+	 echo '/* This file is automatically generated.';\
+	 echo '   It defines macros to allow user program to find the shared'; \
+	 echo '   library files which come as part of GNU libc.  */'; \
+	 echo '#ifndef __GNU_LIB_NAMES_H'; \
+	 echo '#define __GNU_LIB_NAMES_H	1'; \
+	 echo ''; \
+	 $(if $(abi-list-includes), \
+	  $(foreach h,$(abi-list-includes), echo '#include <$(h)>';) \
+	  echo '';) \
+	 $(if $(abi-list-variants), \
+	 $(foreach v,$(abi-list-variants),\
+	 $(if $(abi-list-$(v)-condition),\
+	 echo '#if $(abi-list-$(v)-condition)'; \
+	 ($(foreach s,$(all-sonames), \
+	   $(if $(abi-list-$(v)-$(firstword $(subst =, ,$(s)))-soname),\
+	     echo $(firstword $(subst =, ,$(s)))=$(abi-list-$(v)-$(firstword $(subst =, ,$(s)))-soname);, \
+	     echo $(s);))) \
+	 | LC_ALL=C $(AWK) -v multi=1 -f $(firstword $^) | LC_ALL=C sort;) \
+	 $(if $(abi-list-$(v)-condition),echo '#endif';)), \
+	 ($(foreach s,$(all-sonames), echo $(s);)) \
+	 | LC_ALL=C $(AWK) -f $(firstword $^) | LC_ALL=C sort;) \
+	 echo ''; \
+	 echo '#endif	/* gnu/lib-names.h */'; \
+	} >  ${@:stmp=T}
 	$(move-if-change) ${@:stmp=T} ${@:stmp=h}
 	touch $@
 endif
diff --git a/Makefile b/Makefile
index c0a0cfb828..3859997eae 100644
--- a/Makefile
+++ b/Makefile
@@ -170,14 +170,32 @@ others: $(common-objpfx)testrun.sh
 
 subdir-stubs := $(foreach dir,$(subdirs),$(common-objpfx)$(dir)/stubs)
 
-ifeq ($(biarch),no)
+ifndef abi-list-variants
 installed-stubs = $(inst_includedir)/gnu/stubs.h
 else
-installed-stubs = $(inst_includedir)/gnu/stubs-$(biarch).h
+ifndef default-abi
+default-abi = $(firstword $(abi-list-variants))
+endif
+installed-stubs = $(inst_includedir)/gnu/stubs-$(default-abi).h
 
-$(inst_includedir)/gnu/stubs.h: include/stubs-biarch.h $(+force)
+$(inst_includedir)/gnu/stubs.h: $(common-objpfx)soversions.mk $(+force)
 	$(make-target-directory)
-	$(INSTALL_DATA) $< $@
+	{ \
+	 echo '/* This file is automatically generated.';\
+	 echo "   This file selects the right generated file of \`__stub_FUNCTION' macros";\
+	 echo '   based on the architecture being compiled for.  */'; \
+	 echo ''; \
+	 $(foreach h,$(abi-list-includes), echo '#include <$(h)>';) \
+	 echo ''; \
+	 $(foreach v,$(abi-list-variants),\
+	 $(if $(abi-list-$(v)-condition),\
+	 echo '#if $(abi-list-$(v)-condition)'; \
+	 echo '# include <gnu/stubs-$(v).h>'); \
+	 $(if $(abi-list-$(v)-condition),echo '#endif';) \
+	 rm -f $(@:.d=.h).new$(v); \
+	 ) \
+	} > $(@:.d=.h).new
+	mv -f $(@:.d=.h).new $(@:.d=.h)
 
 install-others-nosubdir: $(installed-stubs)
 endif
diff --git a/include/stubs-biarch.h b/include/stubs-biarch.h
deleted file mode 100644
index fc086bd894..0000000000
--- a/include/stubs-biarch.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* This file selects the right generated file of `__stub_FUNCTION' macros
-   based on the architecture being compiled for.  */
-
-#include <bits/wordsize.h>
-
-#if __WORDSIZE == 32
-# include <gnu/stubs-32.h>
-#elif __WORDSIZE == 64
-# include <gnu/stubs-64.h>
-#else
-# error "unexpected value for __WORDSIZE macro"
-#endif
diff --git a/scripts/lib-names.awk b/scripts/lib-names.awk
index 77e6668515..ccb7b7f431 100644
--- a/scripts/lib-names.awk
+++ b/scripts/lib-names.awk
@@ -1,18 +1,17 @@
 # awk script for soversions.i -> gnu/lib-names.h; see Makeconfig.
 
-$1 != "DEFAULT" { multi = 1 }
-
 #
 {
-  lib = $2;
-  version = $3;
-  if ($3 !~ /^[0-9]/) {
-    soname = $3;
-    extra = $3;
+  split($1, fields, "=")
+  lib = fields[1];
+  soname = version = fields[2];
+  sub(/^.*=/, "", soname);
+  sub(/^lib.*\.so\./, "", version);
+  if ($soname !~ /^lib/) {
+    extra = soname;
     sub(/\.so.*$/, "", extra);
   }
   else {
-    soname = lib ".so." $3;
     extra = "";
   }
   soname = "\"" soname "\"";
@@ -26,41 +25,9 @@ $1 != "DEFAULT" { multi = 1 }
 }
 
 END {
-  print "/* This file is automatically generated.";
-  print "   It defines macros to allow user program to find the shared";
-  print "   library files which come as part of GNU libc.  */";
-  print "#ifndef __GNU_LIB_NAMES_H";
-  print "#define __GNU_LIB_NAMES_H	1";
-  print "";
-
-  pfx = multi ? "# define " : "#define ";
   for (elt in macros) {
     split(elt, x);
-    line = sprintf("%-40s%s", pfx x[2], macros[elt]);
-    if (x[1] in lines)
-      lines[x[1]] = lines[x[1]] "\n" line;
-    else
-      lines[x[1]] = line;
-  }
-
-  if (multi) {
-    # Print these in a fixed order so the result is identical
-    # on both sides of the coin.
-    if (!("WORDSIZE32" in lines))
-      lines["WORDSIZE32"] = lines["DEFAULT"];
-    if (!("WORDSIZE64" in lines))
-      lines["WORDSIZE64"] = lines["DEFAULT"];
-    print "#include <bits/wordsize.h>\n";
-    print "#if __WORDSIZE == 32";
-    cmd = "LC_ALL=C sort"; print lines["WORDSIZE32"] | cmd; close(cmd);
-    print "#else"
-    cmd = "LC_ALL=C sort"; print lines["WORDSIZE64"] | cmd; close(cmd);
-    print "#endif";
+    pfx = multi ? "# define " : "#define ";
+    printf("%-40s%s\n", pfx x[2], macros[elt]);
   }
-  else {
-    cmd = "LC_ALL=C sort"; print lines["DEFAULT"] | cmd; close(cmd);
-  }
-
-  print "";
-  print "#endif	/* gnu/lib-names.h */"
 }
diff --git a/scripts/soversions.awk b/scripts/soversions.awk
index 55577ccc7e..dc8afdc205 100644
--- a/scripts/soversions.awk
+++ b/scripts/soversions.awk
@@ -7,17 +7,6 @@ BEGIN {
 
 { thiscf = $1 }
 
-$2 ~ /WORDSIZE[3264]/ {
-  if ((config ~ thiscf) && !othercf) {
-    othercf = $3;
-    sub(/@CPU@/, cpu, othercf);
-    sub(/@VENDOR@/, vendor, othercf);
-    sub(/@OS@/, os, othercf);
-    configs[othercf] = $2;
-  }
-  next;
-}
-
 $2 == "ABI" {
   if ((config ~ thiscf) && !abiname) {
     abiname = $3;
diff --git a/shlib-versions b/shlib-versions
index b8ed1e9b7d..38fc7ea0b8 100644
--- a/shlib-versions
+++ b/shlib-versions
@@ -18,11 +18,6 @@
 # library has no third column.  The defaults must precede the entries they
 # apply to.
 #
-# An entry with WORDSIZE* in the second column gives an alternate
-# configuration tuple whose macros will be conditionally defined in
-# gnu/lib-names.h; @CPU@, @VENDOR@, @OS@ can be used in the third
-# column to compose the alternate tuple matched against the patterns here.
-
 # Configuration		DEFAULT			Earliest symbol set
 # -------------		---------------		------------------------------
 
@@ -30,17 +25,6 @@ s390x-.*-linux.*        DEFAULT			GLIBC_2.2
 powerpc64-.*-linux.*	DEFAULT			GLIBC_2.3
 .*-.*-gnu-gnu.*		DEFAULT			GLIBC_2.2.6
 
-# Configuration		WORDSIZE[32|64]		Alternate configuration
-# -------------		----------		-----------------------
-x86_64-.*-.*		WORDSIZE32		i686-@VENDOR@-@OS@
-i.86-.*-.*		WORDSIZE64		x86_64-@VENDOR@-@OS@
-s390x-.*-.*		WORDSIZE32		s390-@VENDOR@-@OS@
-s390-.*-.*		WORDSIZE64		s390x-@VENDOR@-@OS@
-powerpc64-.*-.*		WORDSIZE32		powerpc-@VENDOR@-@OS@
-powerpc.*-.*-.*		WORDSIZE64		powerpc64-@VENDOR@-@OS@
-sparc64.*-.*-.*		WORDSIZE32		sparc-@VENDOR@-@OS@
-sparc.*-.*-.*		WORDSIZE64		sparc64-@VENDOR@-@OS@
-
 # Configuration		ABI			Identifier for ABI data files
 # -------------		----------		-----------------------------
 sparc64.*-.*-.*		ABI			sparc64-@OS@
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 70fd137dbc..db05c9e66b 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -40,28 +40,11 @@ sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
 
 tests += tst-clone
 
-# Generate the list of SYS_* macros for the system calls (__NR_* macros).
-
-# If there is more than one syscall list for different architecture
-# variants, the CPU/Makefile defines syscall-list-variants to be a
-# list of names for those variants (e.g. 32bit 64bit), and, for each
-# variant, defines syscall-list-$(variant)-options to be compiler
-# options to cause <asm/unistd.h> to define the desired list of
-# syscalls and syscall-list-$(variant)-condition to be the condition
-# for those options to use in a C #if condition.
-# syscall-list-includes may be defined to a list of headers to include
-# in the generated header, if the default does not suffice.
-
-ifndef syscall-list-variants
-syscall-list-variants := default
-syscall-list-default-options :=
-syscall-list-default-condition :=
-endif
-
-ifndef syscall-list-includes
-syscall-list-includes := bits/wordsize.h
+ifndef abi-list-includes
+abi-list-includes := bits/wordsize.h
 endif
 
+# Generate the list of SYS_* macros for the system calls (__NR_* macros).
 $(objpfx)bits/syscall%h $(objpfx)bits/syscall%d: ../sysdeps/unix/sysv/linux/sys/syscall.h
 	$(make-target-directory)
 	{ \
@@ -71,30 +54,30 @@ $(objpfx)bits/syscall%h $(objpfx)bits/syscall%d: ../sysdeps/unix/sysv/linux/sys/
 	 echo '# error "Never use <bits/syscall.h> directly; include <sys/syscall.h> instead."'; \
 	 echo '#endif'; \
 	 echo ''; \
-	 $(foreach h,$(syscall-list-includes), echo '#include <$(h)>';) \
+	 $(foreach h,$(abi-list-includes), echo '#include <$(h)>';) \
 	 echo ''; \
-	 $(foreach v,$(syscall-list-variants),\
+	 $(foreach v,$(abi-list-variants),\
 	 $(CC) -E -MD -MP -MF $(@:.h=.d)-t$(v) -MT '$(@:.d=.h) $(@:.h=.d)' \
-	       -x c $(sysincludes) $< $(syscall-list-$(v)-options) \
+	       -x c $(sysincludes) $< $(abi-list-$(v)-options) \
 	       -D_LIBC -dM | \
 	 sed -n 's@^#define __NR_\([^ ]*\) .*$$@#define SYS_\1 __NR_\1@p' | \
 	 LC_ALL=C sort > $(@:.d=.h).new$(v); \
-	 $(if $(syscall-list-$(v)-condition),\
-	 echo '#if $(syscall-list-$(v)-condition)';) \
+	 $(if $(abi-list-$(v)-condition),\
+	 echo '#if $(abi-list-$(v)-condition)';) \
 	 cat $(@:.d=.h).new$(v); \
-	 $(if $(syscall-list-$(v)-condition),echo '#endif';) \
+	 $(if $(abi-list-$(v)-condition),echo '#endif';) \
 	 rm -f $(@:.d=.h).new$(v); \
 	 ) \
 	} > $(@:.d=.h).new
 	mv -f $(@:.d=.h).new $(@:.d=.h)
 ifneq (,$(objpfx))
 	sed $(sed-remove-objpfx) \
-	 $(foreach v,$(syscall-list-variants),$(@:.h=.d)-t$(v)) > $(@:.h=.d)-t3
+	 $(foreach v,$(abi-list-variants),$(@:.h=.d)-t$(v)) > $(@:.h=.d)-t3
 else
-	cat $(foreach v,$(syscall-list-variants),$(@:.h=.d)-t$(v)) \
+	cat $(foreach v,$(abi-list-variants),$(@:.h=.d)-t$(v)) \
 	 > $(@:.h=.d)-t3
 endif
-	rm -f $(foreach v,$(syscall-list-variants),$(@:.h=.d)-t$(v))
+	rm -f $(foreach v,$(abi-list-variants),$(@:.h=.d)-t$(v))
 	mv -f $(@:.h=.d)-t3 $(@:.h=.d)
 
 ifndef no_deps
diff --git a/sysdeps/unix/sysv/linux/i386/Makefile b/sysdeps/unix/sysv/linux/i386/Makefile
index fc5a524ebf..6301affc52 100644
--- a/sysdeps/unix/sysv/linux/i386/Makefile
+++ b/sysdeps/unix/sysv/linux/i386/Makefile
@@ -1,3 +1,21 @@
+# We don't need any header files.
+abi-list-includes :=
+
+# The default ABI is 32.
+default-abi := 32
+
+abi-list-variants := 32 64 x32
+
+abi-list-32-options := -D__i386__ -U__x86_64__
+abi-list-32-condition := !defined __x86_64__
+abi-list-32-ld-soname := ld-linux.so.2
+abi-list-64-options := -U__i386__ -D__x86_64__ -U__ILP32__ -D__LP64__
+abi-list-64-condition := defined __x86_64__ && defined __LP64__
+abi-list-64-ld-soname := ld-linux-x86-64.so.2
+abi-list-x32-options := -U__i386__ -D__x86_64__ -D__ILP32__ -U__LP64__
+abi-list-x32-condition := defined __x86_64__ && defined __ILP32__
+abi-list-x32-ld-soname := ld-linux-x32.so.2
+
 ifeq ($(subdir),misc)
 sysdep_routines += ioperm iopl vm86 call_pselect6 call_fallocate
 sysdep_headers += sys/elf.h sys/perm.h sys/reg.h sys/vm86.h sys/debugreg.h sys/io.h
diff --git a/sysdeps/unix/sysv/linux/powerpc/Makefile b/sysdeps/unix/sysv/linux/powerpc/Makefile
index 55311a4fc1..3b012a2f0f 100644
--- a/sysdeps/unix/sysv/linux/powerpc/Makefile
+++ b/sysdeps/unix/sysv/linux/powerpc/Makefile
@@ -1,8 +1,8 @@
-syscall-list-variants := 32bit 64bit
-syscall-list-32bit-options := -U__powerpc64__
-syscall-list-32bit-condition := __WORDSIZE == 32
-syscall-list-64bit-options := -D__powerpc64__
-syscall-list-64bit-condition := __WORDSIZE == 64
+abi-list-variants := 32 64
+abi-list-32-options := -U__powerpc64__
+abi-list-32-condition := __WORDSIZE == 32
+abi-list-64-options := -D__powerpc64__
+abi-list-64-condition := __WORDSIZE == 64
 
 ifeq ($(subdir),rt)
 librt-routines += rt-sysdep
diff --git a/sysdeps/unix/sysv/linux/s390/Makefile b/sysdeps/unix/sysv/linux/s390/Makefile
index fb20fb05ac..2fd53f4308 100644
--- a/sysdeps/unix/sysv/linux/s390/Makefile
+++ b/sysdeps/unix/sysv/linux/s390/Makefile
@@ -1,8 +1,8 @@
-syscall-list-variants := 32bit 64bit
-syscall-list-32bit-options := -U__s390x__
-syscall-list-32bit-condition := __WORDSIZE == 32
-syscall-list-64bit-options := -D__s390x__
-syscall-list-64bit-condition := __WORDSIZE == 64
+abi-list-variants := 32 64
+abi-list-32-options := -U__s390x__
+abi-list-32-condition := __WORDSIZE == 32
+abi-list-64-options := -D__s390x__
+abi-list-64-condition := __WORDSIZE == 64
 
 ifeq ($(subdir),rt)
 librt-routines += rt-sysdep
diff --git a/sysdeps/unix/sysv/linux/sparc/Makefile b/sysdeps/unix/sysv/linux/sparc/Makefile
index d769c48526..3f7af37a92 100644
--- a/sysdeps/unix/sysv/linux/sparc/Makefile
+++ b/sysdeps/unix/sysv/linux/sparc/Makefile
@@ -1,8 +1,8 @@
-syscall-list-variants := 32bit 64bit
-syscall-list-32bit-options := -U__sparc_v9__ -U__arch64__
-syscall-list-32bit-condition := __WORDSIZE == 32
-syscall-list-64bit-options := -D__sparc_v9__ -D__arch64__
-syscall-list-64bit-condition := __WORDSIZE == 64
+abi-list-variants := 32 64
+abi-list-32-options := -U__sparc_v9__ -U__arch64__
+abi-list-32-condition := __WORDSIZE == 32
+abi-list-64-options := -D__sparc_v9__ -D__arch64__
+abi-list-64-condition := __WORDSIZE == 64
 
 ifeq ($(subdir),rt)
 librt-routines += rt-sysdep
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/Makefile b/sysdeps/unix/sysv/linux/x86_64/64/Makefile
new file mode 100644
index 0000000000..a7b6dc5a53
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/64/Makefile
@@ -0,0 +1,2 @@
+# The default ABI is 64.
+default-abi := 64
diff --git a/sysdeps/unix/sysv/linux/x86_64/Makefile b/sysdeps/unix/sysv/linux/x86_64/Makefile
index 367694882e..2b36544e3f 100644
--- a/sysdeps/unix/sysv/linux/x86_64/Makefile
+++ b/sysdeps/unix/sysv/linux/x86_64/Makefile
@@ -1,10 +1,17 @@
-syscall-list-variants := 32bit 64bit x32
-syscall-list-32bit-options := -D__i386__ -U__x86_64__
-syscall-list-32bit-condition := !defined __x86_64__
-syscall-list-64bit-options := -U__i386__ -D__x86_64__ -U__ILP32__ -D__LP64__
-syscall-list-64bit-condition := defined __x86_64__ && defined __LP64__
-syscall-list-x32-options := -U__i386__ -D__x86_64__ -D__ILP32__ -U__LP64__
-syscall-list-x32-condition := defined __x86_64__ && defined __ILP32__
+# We don't need any header files.
+abi-list-includes :=
+
+abi-list-variants := 32 64 x32
+
+abi-list-32-options := -D__i386__ -U__x86_64__
+abi-list-32-condition := !defined __x86_64__
+abi-list-32-ld-soname := ld-linux.so.2
+abi-list-64-options := -U__i386__ -D__x86_64__ -U__ILP32__ -D__LP64__
+abi-list-64-condition := defined __x86_64__ && defined __LP64__
+abi-list-64-ld-soname := ld-linux-x86-64.so.2
+abi-list-x32-options := -U__i386__ -D__x86_64__ -D__ILP32__ -U__LP64__
+abi-list-x32-condition := defined __x86_64__ && defined __ILP32__
+abi-list-x32-ld-soname := ld-linux-x32.so.2
 
 ifeq ($(subdir),misc)
 sysdep_routines += ioperm iopl
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/Makefile b/sysdeps/unix/sysv/linux/x86_64/x32/Makefile
index aa78238a0d..ecbdefb2d3 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/Makefile
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/Makefile
@@ -1,3 +1,6 @@
+# The default ABI is x32.
+default-abi := x32
+
 ifeq ($(subdir),misc)
 sysdep_routines += arch_prctl
 endif