Gentoo: add --with-extra-soversion-suffix= option

--with-extra-soversion-suffix= will allow Gentoo to
distinct libbfd.so and libopcodes.so to have more precise
SONAME.

Today --enable-targets=all and --enable-64-bit-bfd change
libbfd.so ABI:
--enable-targets=all adds new symbols to the library
--enable-64-bit-bfd modifies BFD_ARCH_SIZE default and
changes sizes of integer parameters and fields to most
APIs.

--with-extra-soversion-suffix= will allow Gentoo to inject
additional keys into SONAME to indicate ABI change and avoid
hard to diagnose crashes when user reinstalls libbfd.so
built with different flags (see https://bugs.gentoo.org/663690).

Bug: https://bugs.gentoo.org/666100
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

bfd/Makefile.am

@@ -59,6 +59,8 @@ bfdinclude_HEADERS += $(INCDIR)/plugin-api.h
 LIBDL = @lt_cv_dlopen_libs@
 endif
 
+EXTRA_SOVERSION_SUFFIX = @EXTRA_SOVERSION_SUFFIX@
+
 # bfd.h goes here, for now
 BFD_H = bfd.h
 
@@ -961,6 +963,9 @@ bfdver.h: $(srcdir)/version.h $(srcdir)/development.sh $(srcdir)/Makefile.in
 	  bfd_version_string="\"$(VERSION).$${bfd_version_date}\"" ;\
 	  bfd_soversion="$(VERSION).$${bfd_version_date}" ;\
 	fi ;\
+	if test x"$(EXTRA_SOVERSION_SUFFIX)" != x ; then \
+	  bfd_soversion="$${bfd_soversion}.$(EXTRA_SOVERSION_SUFFIX)" ;\
+	fi ;\
 	$(SED) -e "s,@bfd_version@,$$bfd_version," \
 	    -e "s,@bfd_version_string@,$$bfd_version_string," \
 	    -e "s,@bfd_version_package@,$$bfd_version_package," \

bfd/Makefile.in

@@ -317,6 +317,7 @@ ECHO_T = @ECHO_T@
 EGREP = @EGREP@
 EXEEXT = @EXEEXT@
 EXEEXT_FOR_BUILD = @EXEEXT_FOR_BUILD@
+EXTRA_SOVERSION_SUFFIX = @EXTRA_SOVERSION_SUFFIX@
 FGREP = @FGREP@
 GENCAT = @GENCAT@
 GMSGFMT = @GMSGFMT@
@@ -2073,6 +2074,9 @@ bfdver.h: $(srcdir)/version.h $(srcdir)/development.sh $(srcdir)/Makefile.in
 	  bfd_version_string="\"$(VERSION).$${bfd_version_date}\"" ;\
 	  bfd_soversion="$(VERSION).$${bfd_version_date}" ;\
 	fi ;\
+	if test x"$(EXTRA_SOVERSION_SUFFIX)" != x ; then \
+	  bfd_soversion="$${bfd_soversion}.$(EXTRA_SOVERSION_SUFFIX)" ;\
+	fi ;\
 	$(SED) -e "s,@bfd_version@,$$bfd_version," \
 	    -e "s,@bfd_version_string@,$$bfd_version_string," \
 	    -e "s,@bfd_version_package@,$$bfd_version_package," \

bfd/configure

@@ -696,6 +696,7 @@ WARN_CFLAGS
 REPORT_BUGS_TEXI
 REPORT_BUGS_TO
 PKGVERSION
+EXTRA_SOVERSION_SUFFIX
 DEBUGDIR
 PLUGINS_FALSE
 PLUGINS_TRUE
@@ -833,6 +834,7 @@ enable_secureplt
 enable_separate_code
 enable_leading_mingw64_underscores
 with_separate_debug_dir
+with_extra_soversion_suffix
 with_pkgversion
 with_bugurl
 enable_werror
@@ -1508,6 +1510,8 @@ Optional Packages:
   --with-separate-debug-dir=DIR
                           Look for global separate debug info in DIR
                           [[default=LIBDIR/debug]]
+  --with-extra-soversion-suffix=SUFFIX
+                          Append '.SUFFIX' to SONAME [default=]
   --with-pkgversion=PKG   Use PKG in the version string in place of "GNU
                           Binutils"
   --with-bugurl=URL       Direct users to URL to report a bug
@@ -12520,6 +12524,15 @@ fi
 
 
 
+EXTRA_SOVERSION_SUFFIX=
+
+# Check whether --with-extra-soversion-suffix was given.
+if test "${with_extra_soversion_suffix+set}" = set; then :
+  withval=$with_extra_soversion_suffix; EXTRA_SOVERSION_SUFFIX="${withval}"
+fi
+
+
+
 
 
 # Check whether --with-pkgversion was given.

bfd/configure.ac

@@ -137,6 +137,13 @@ AC_ARG_WITH(separate-debug-dir,
 [DEBUGDIR="${withval}"])
 AC_SUBST(DEBUGDIR)
 
+EXTRA_SOVERSION_SUFFIX=
+AC_ARG_WITH(extra-soversion-suffix,
+  AS_HELP_STRING([--with-extra-soversion-suffix=SUFFIX],
+                 [Append '.SUFFIX' to SONAME [[default=]]]),
+[EXTRA_SOVERSION_SUFFIX="${withval}"])
+AC_SUBST(EXTRA_SOVERSION_SUFFIX)
+
 ACX_PKGVERSION([GNU Binutils])
 ACX_BUGURL([http://www.sourceware.org/bugzilla/])