[PATCH] Implement "make update-all-abi"

[Florian Weimer <fweimer at redhat dot com>]

This picks up an old idea, from this thread:

  <https://sourceware.org/ml/libc-alpha/2015-03/msg00302.html>

This patch depends on the abilist format change.  The new implementation
just uses sort and one invocation of âcommâ.

I tested ABI updates in string and resolv subdirectories, on x86_64 and
ppc64le (which defines abilist-pattern).

Florian

2015-10-29  Florian Weimer  <fweimer@redhat.com>

	* scripts/update-abilist.sh: New file.
	* Makefile (+subdir_targets): Add subdir_update-all-abi.
	* Makerules (update-all-abi-%, update-all-abi)
	(subdir_update-all-abi): New targets.
	* elf/Makefile (update-all-abi): New target.

diff --git a/Makefile b/Makefile
index 1d800e3..9a01c93 100644
--- a/Makefile
+++ b/Makefile
@@ -53,6 +53,7 @@ endif # $(AUTOCONF) = no
 		   subdir_clean subdir_distclean subdir_realclean	\
 		   tests xtests						\
 		   subdir_update-abi subdir_check-abi			\
+		   subdir_update-all-abi				\
 		   subdir_echo-headers					\
 		   subdir_install					\
 		   subdir_objs subdir_stubs subdir_testclean		\
diff --git a/Makerules b/Makerules
index 1329f73..1b73144 100644
--- a/Makerules
+++ b/Makerules
@@ -1347,25 +1347,48 @@ define update-abi
  fi
 endef
 
-.PHONY: update-abi check-abi
+# Patch all .abilist files for one DSO.  Avoid updating the abilist
+# files in /generic/, because these are kept empty.
+ifdef abilist-pattern
+update-all-abi-%: $(abilist-pattern) $(objpfx)%.symlist
+	$(update-all-abi)
+update-all-abi-%: $(abilist-pattern) $(common-objpfx)%.symlist
+	$(update-all-abi)
+endif
+update-all-abi-%: %.abilist $(objpfx)%.symlist
+	$(update-all-abi)
+update-all-abi-%: %.abilist $(common-objpfx)%.symlist
+	$(update-all-abi)
+define update-all-abi
+bash $(..)scripts/update-abilist.sh $^ \
+  $$(find $(..)sysdeps \
+    -regextype posix-egrep -regex '.*/$*([^a-z0-9].*)?\.abilist$$' \
+    \! -regex '.*/generic/.*')
+endef
+
+.PHONY: update-abi update-all-abi check-abi
 update-abi: $(patsubst %.so,update-abi-%,$(install-lib.so-versioned))
+update-all-abi: $(patsubst %.so,update-all-abi-%,$(install-lib.so-versioned))
 check-abi-list = $(patsubst %.so,$(objpfx)check-abi-%.out, \
 				 $(install-lib.so-versioned))
 check-abi: $(check-abi-list)
 ifdef subdir
 subdir_check-abi: check-abi
 subdir_update-abi: update-abi
+subdir_update-all-abi: update-all-abi
 else
 check-abi: subdir_check-abi
 	if grep -q '^FAIL:' $(objpfx)*/check-abi*.test-result; then \
 		cat $(objpfx)*/check-abi*.out && exit 1; fi
 update-abi: subdir_update-abi
+update-all-abi: subdir_update-all-abi
 endif
 
 ifeq ($(subdir),elf)
 check-abi: $(objpfx)check-abi-libc.out
 tests-special += $(objpfx)check-abi-libc.out
 update-abi: update-abi-libc
+update-all-abi: update-all-abi-libc
 common-generated += libc.symlist
 endif
 
diff --git a/elf/Makefile b/elf/Makefile
index 546c8eb..8341397 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -299,6 +299,7 @@ endif
 check-abi: $(objpfx)check-abi-ld.out
 tests-special += $(objpfx)check-abi-ld.out
 update-abi: update-abi-ld
+update-all-abi: update-all-abi-ld
 
 include ../Rules
 
diff --git a/scripts/update-abilist.sh b/scripts/update-abilist.sh
new file mode 100644
index 0000000..f0924c7
--- /dev/null
+++ b/scripts/update-abilist.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+# Update abilist files based on differences on one architecture.
+# Copyright (C) 2015 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, see
+# <http://www.gnu.org/licenses/>.
+
+set -e
+set -o pipefail
+export LC_ALL=C
+
+if test $# -lt 3 ; then
+    echo "usage: $0 OLD-FILE NEW-FILE FILES-TO-BE-PATCHED..." 1>&2
+    exit 2
+fi
+
+old_file="$1"
+shift
+new_file="$1"
+shift
+
+tmp_new_symbols="$(mktemp)"
+tmp_patched="$(mktemp)"
+
+cleanup () {
+    rm -f -- "$tmp_new_symbols" "$tmp_patched"
+}
+
+trap cleanup 0
+
+# -1 skips symbols only in $old_file (deleted symbols).
+# -3 skips symbols in both files (unchanged symbols).
+comm -1 -3 <(sort -u -- "$old_file") <(sort -u -- "$new_file") \
+     > "$tmp_new_symbols"
+
+new_symbol_count="$(wc -l < "$tmp_new_symbols")"
+if test "$new_symbol_count" -eq 0 ; then
+    echo "info: no symbols added" 1>&2
+    exit 0
+fi
+
+echo "info: $new_symbol_count symbol(s) added" 1>&2
+
+for to_be_patched in "$@" ; do
+    sort -u -o "$tmp_patched" -- "$to_be_patched" "$tmp_new_symbols"
+    if ! cmp -s -- "$to_be_patched" "$tmp_patched" ; then
+	echo "info: updating $to_be_patched" 1>&2
+	cp -- "$tmp_patched" "$to_be_patched"
+    fi
+done