build: New configure option --with-libtool-modification.

* Makefile.am (EXTRA_DIST): Add build-aux/libtool-patch.sed.
* build-aux/libtool-patch.sed: New.
* configure.ac (--with-libtool-modification): New.
* build-aux/ltmain.sh: Revert our own local modification.

--

Fixes-commit: e622e36f1f32641c66b28a0de95c75ae35f6ca05
GnuPG-bug-id: 6619
Signed-off-by: NIIBE Yutaka <[email protected]>

2 files changed, 68 insertions, 13 deletions

diff --git a/build-aux/libtool-patch.sed b/build-aux/libtool-patch.sed
new file mode 100644
index 00000000..ac5a3bad
--- /dev/null
+++ b/build-aux/libtool-patch.sed
@@ -0,0 +1,68 @@
+#
+# This is a sed script to patch the generated libtool,
+# which works well against both of libtool 2.4.2 and 2.4.7.
+#
+# You may use this work under the terms of a Creative Commons CC0 1.0
+# License/Waiver.
+#
+# CC0 Public Domain Dedication
+# https://creativecommons.org/publicdomain/zero/1.0/
+
+#
+# This sed script applys two hunks of the patch:
+#
+#     Part1: after the comment "# bleh windows"
+#     Part2: after the comment "#extension on DOS 8.3..."
+#
+# Only when those two parts are patched correctly, it exits with 0 or
+# else, it exits with 1
+#
+
+# Find the part 1, by the comment
+/^[ \t]*# bleh windows$/b part1_start
+# Not found the part1, raise an error
+$ q1
+b
+
+:part1_start
+n
+# The first line in the part 1 must be the begining of the case statement.
+/^[ \t]*case \$host in$/! q1
+n
+# Insert the entry for x86_64-*mingw32*, for modified versuffix.
+i\
+	      x86_64-*mingw32*)
+i\
+		func_arith $current - $age
+i\
+		major=$func_arith_result
+i\
+		versuffix="6-$major"
+i\
+		;;
+:part1_0
+# Find the end of the case statement
+/^[ \t]*esac$/b find_part2
+# Not found the end of the case statement, raise an error
+$ q1
+n
+b part1_0
+
+:find_part2
+/^[ \t]*# extension on DOS 8.3 file.*systems.$/b part2_process
+# Not found the part2, raise an error
+$ q1
+n
+b find_part2
+
+:part2_process
+$ q1
+s/^[ \t]*\(versuffix=\)\(.*\)\(-$major\)\(.*\)$/\t  case \$host in\n\t  x86_64-*mingw32*)\n\t    \1\26\3\4\n\t    ;;\n\t  *)\n\t    \1\2\3\4\n\t    ;;\n\t  esac/
+t part2_done
+n
+b part2_process
+
+:part2_done
+$ q0
+n
+b part2_done
diff --git a/build-aux/ltmain.sh b/build-aux/ltmain.sh
index c3bcdc06..77963a93 100644
--- a/build-aux/ltmain.sh
+++ b/build-aux/ltmain.sh
@@ -6766,11 +6766,6 @@ func_mode_link ()
 	    elif test -n "$soname_spec"; then
 	      # bleh windows
 	      case $host in
-              x86_64-*mingw32*)
-                func_arith $current - $age
-		major=$func_arith_result
-		versuffix="6-$major"
-		;;
 	      *cygwin* | mingw* | *cegcc*)
 	        func_arith $current - $age
 		major=$func_arith_result
@@ -7504,14 +7499,6 @@ func_mode_link ()
 	  func_arith $current - $age
 	  major=$func_arith_result
 	  versuffix="-$major"
-          case $host in
-          x86_64-*mingw32*)
-             versuffix="6-$major"
-             ;;
-          *)
-             versuffix="-$major"
-             ;;
-          esac
 	  ;;
 
 	*)