commit 130ac68ca25c9aa65e027e3e37337bc048205c69

Author: Siddhesh Poyarekar <siddhesh@redhat.com>

Date:   Wed Nov 19 12:16:00 2014 +0530

    Auto-generate libc-modules.h

    Remove libc-modules.h from the tree and auto-generate it from

    soversions.i and the list of modules in the built-modules variable

    defined in Makeconfig.  Macros generated have increasing numbered

    values, with built-modules having lower values starting from 1,

    following which a separator value LIBS_BEGIN is added and then finally

    the library names from soversions.i are appended to the list.  This

    allows us to conveniently differentiate between the versioned

    libraries and other built modules, which is needed in errno.h and

    netdb.h to decide whether to use an internal symbol or an external

    one.

    Verified that generated code remains unchanged on x86_64.

    	* Makeconfig (built-modules): List non-library modules to be

    	built.

    	(module-cppflags): Include libc-modules.h for

    	everything except shlib-versions.v.i.

    	(CPPFLAGS): Use it.

    	(before-compile): Add libc-modules.h.

    	($(common-objpfx)libc-modules.h,

    	$(common-objpfx)libc-modules.stmp): New targets.

    	(common-generated): Add libc-modules.h and libc-modules.stmp.

    	($(common-objpfx)Versions.v.i): Depend on libc-modules.h.

    	* include/libc-symbols.h: Don't include libc-modules.h.

    	* include/libc-modules.h: Remove file.

    	* scripts/gen-libc-modules.awk: New script to generate

    	libc-modules.h.

    	* sysdeps/unix/Makefile ($(common-objpfx)sysd-syscalls):

    	Depend on libc-modules.stmp.

commit 8a257e2cb50cd8e8e3e2368d80bf325ea4086cf9

Author: Roland McGrath <roland@hack.frob.com>

Date:   Thu Apr 9 14:42:29 2015 -0700

    Omit libc-modules.h for all .v.i files.

Index: glibc-2.17-c758a686/Makeconfig

===================================================================

--- glibc-2.17-c758a686.orig/Makeconfig

+++ glibc-2.17-c758a686/Makeconfig

@@ -730,19 +730,34 @@ endif	# $(+cflags) == ""

 # of many little headers in the include directory.

 libio-include = -I$(..)libio

+# List of non-library modules that we build.

+built-modules = iconvprogs iconvdata ldconfig lddlibc4 libmemusage \

+		libSegFault libpcprofile librpcsvc locale-programs \

+		memusagestat nonlib nscd extramodules libnldbl

+

 in-module = $(subst -,_,$(firstword $(libof-$(basename $(@F))) \

 				    $(libof-$(

 				    $(libof-$(@F)) \

 				    libc))

+module-cppflags-real = -include $(common-objpfx)libc-modules.h \

+		       -DIN_MODULE=MODULE_$(in-module)

+

+# We don't need libc-modules.h and the MODULE_NAME definition for .v.i

+# files.  These targets don't (and will likely never need to) use the IS_IN

+# facility.  In fact, shlib-versions should not use it because that will

+# create a circular dependency as libc-modules.h is generated from

+# shlib-versions.

+module-cppflags = $(if $(filter %.v.i,$(@F)),,$(module-cppflags-real))

+

 # These are the variables that the implicit compilation rules use.

 # Note that we can't use -std=* in CPPFLAGS, because it overrides

 # the implicit -lang-asm and breaks cpp behavior for .S files--notably

 # it causes cpp to stop predefining __ASSEMBLER__.

 CPPFLAGS = $(CPPUNDEFS) $(CPPFLAGS-config) $($(subdir)-CPPFLAGS) \

-	   $(+includes) $(defines) \

+	   $(+includes) $(defines) $(module-cppflags) \

 	   -include $(..)include/libc-symbols.h $(sysdep-CPPFLAGS) \

-	   $(CPPFLAGS-$(suffix $@)) -DIN_MODULE=MODULE_$(in-module) \

+	   $(CPPFLAGS-$(suffix $@)) \

 	   $(foreach lib,$(libof-$(basename $(@F))) \

 			 $(libof-$(

 	   $(CPPFLAGS-$(

@@ -922,6 +937,23 @@ endif

 postclean-generated += soversions.mk soversions.i \

 		       shlib-versions.v shlib-versions.v.i

+before-compile += $(common-objpfx)libc-modules.h

+ifeq ($(soversions.mk-done),t)

+# Generate a header with macro definitions for use with the IS_IN macro.

+# These are the possible values for the IN_MODULE macro defined when building

+# sources, to identify which module the translation unit is going to be built

+# into.

+$(common-objpfx)libc-modules.h: $(common-objpfx)libc-modules.stmp; @:

+$(common-objpfx)libc-modules.stmp: $(..)scripts/gen-libc-modules.awk \

+				   $(common-objpfx)soversions.i

+	$(AWK) -v buildlist="$(subst -,_,$(built-modules))" -f $^ > ${@:stmp=T}

+	$(move-if-change) ${@:stmp=T} ${@:stmp=h}

+	touch $@

+

+endif

+

+common-generated += libc-modules.h libc-modules.stmp

+

 # Generate the header containing the names of all shared libraries.

 # We use a stamp file to avoid unnecessary recompilations.

 before-compile += $(common-objpfx)gnu/lib-names.h

Index: glibc-2.17-c758a686/include/libc-modules.h

===================================================================

--- glibc-2.17-c758a686.orig/include/libc-modules.h

+++ /dev/null

@@ -1,41 +0,0 @@

-/* Valid values for the IN_MODULE macro, which is defined for each source file

-   during compilation to indicate which module it is to be built into.

-

-   TODO: This file should eventually be auto-generated.  */

-#define MODULE_libc		1

-#define MODULE_libpthread	2

-#define MODULE_rtld		3

-#define MODULE_libdl		4

-#define MODULE_libm		5

-#define MODULE_iconvprogs	6

-#define MODULE_iconvdata	7

-#define MODULE_lddlibc4		8

-#define MODULE_locale_programs	9

-#define MODULE_memusagestat	10

-#define MODULE_libutil		12

-#define MODULE_libBrokenLocale	13

-#define MODULE_libmemusage	15

-#define MODULE_libresolv	16

-#define MODULE_libnss_db	17

-#define MODULE_libnss_files	18

-#define	MODULE_libnss_dns	19

-#define MODULE_libnss_compat	20

-#define MODULE_libnss_hesiod	21

-#define MODULE_libnss_nis	22

-#define MODULE_libnss_nisplus	23

-#define MODULE_libanl		24

-#define MODULE_librt		25

-#define MODULE_libSegFault	26

-#define MODULE_libthread_db	27

-#define MODULE_libcidn		28

-#define MODULE_libcrypt		29

-#define MODULE_libnsl		30

-#define MODULE_libpcprofile	31

-#define MODULE_librpcsvc	32

-#define MODULE_nscd		33

-#define MODULE_ldconfig 	34

-#define MODULE_libnldbl 	35

-

-/* Catch-all for test modules and other binaries.  */

-#define MODULE_nonlib		98

-#define MODULE_extramodules	99

Index: glibc-2.17-c758a686/include/libc-symbols.h

===================================================================

--- glibc-2.17-c758a686.orig/include/libc-symbols.h

+++ glibc-2.17-c758a686/include/libc-symbols.h

@@ -20,9 +20,6 @@

 #ifndef _LIBC_SYMBOLS_H

 #define _LIBC_SYMBOLS_H	1

-/* Pull in definitions for the MODULE_* macros.  */

-#include <libc-modules.h>

-

 #define IS_IN(lib) (IN_MODULE == MODULE_##lib)

 /* This file's macros are included implicitly in the compilation of every

Index: glibc-2.17-c758a686/scripts/gen-libc-modules.awk

===================================================================

--- /dev/null

+++ glibc-2.17-c758a686/scripts/gen-libc-modules.awk

@@ -0,0 +1,34 @@

+# Generate a header file that defines the MODULE_* macros for each library and

+# module we build in glibc.  The library names are pulled in from soversions.i

+# and the additional modules are passed in the BUILDLIST variable.

+BEGIN {

+  # BUILDLIST is set from the build-list variable in Makeconfig and is a space

+  # separated list of non-library modules that we build in glibc.

+  num = split (buildlist, libs, " ")

+  # Separate the built modules from the libraries.

+  libs[++num] = "LIBS_BEGIN"

+}

+

+# Skip over comments.

+$1 == "#" {

+  next

+}

+

+# We have only one special case in soversions.i parsing, which is to replace ld

+# with rtld since that's what we call it throughout the sources.

+match (FILENAME, ".*soversions.i") {

+  name = $2

+  if (name == "ld")

+    name = "rtld"

+

+  # Library names are not duplicated in soversions.i.

+  libs[++num] = name

+}

+

+# Finally, print out the header file.

+END {

+  printf ("/* AUTOGENERATED BY gen-libc-modules.awk, DO NOT EDIT.  */\n\n")

+  for (l in libs) {

+    printf ("#define MODULE_%s %d\n", libs[l], l)

+  }

+}

Index: glibc-2.17-c758a686/sysdeps/unix/Makefile

===================================================================

--- glibc-2.17-c758a686.orig/sysdeps/unix/Makefile

+++ glibc-2.17-c758a686/sysdeps/unix/Makefile

@@ -77,7 +77,8 @@ compile-syscall = $(COMPILE.S) -o $@ -x

 ifndef avoid-generated

 $(common-objpfx)sysd-syscalls: $(..)sysdeps/unix/make-syscalls.sh \

-			       $(wildcard $(+sysdep_dirs:%=%/syscalls.list))

+			       $(wildcard $(+sysdep_dirs:%=%/syscalls.list)) \

+			       $(common-objpfx)libc-modules.stmp

 	for dir in $(+sysdep_dirs); do \

 	  test -f $$dir/syscalls.list && \

 	  { sysdirs='$(sysdirs)' \