ar P support

This patch extends "ar P" to allow creation of normal (as distinct
from thin) archives with full path names.

	PR 452
	PR 25104
bfd/
	* archive.c (normalize): Return file unchanged when
	BFD_ARCHIVE_FULL_PATH.
	(_bfd_construct_extended_name_table): Pass abfd, the output
	bfd, to normalize.
	(_bfd_archive_bsd44_construct_extended_name_table): Likewise.
	* bfd.c (struct bfd): Make flags a full flagword.
	(BFD_ARCHIVE_FULL_PATH): Define.
	* bfd-in2.h: Regenerate.
binutils/
	* ar.c (write_archive): Set BFD_ARCHIVE_FULL_PATH.
	* doc/binutils.texi (extract from archive): Mention
	restrictions when extracting from archives with full paths.
	(ar P): Update to current P support.
	(ar -X32_64): Fix spelling.

3 files changed, 32 insertions, 8 deletions

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index e47c145..74a223b 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,13 @@
+2019-10-21  Alan Modra  <amodra@gmail.com>
+
+	PR 452
+	PR 25104
+	* ar.c (write_archive): Set BFD_ARCHIVE_FULL_PATH.
+	* doc/binutils.texi (extract from archive): Mention
+	restrictions when extracting from archives with full paths.
+	(ar P): Update to current P support.
+	(ar -X32_64): Fix spelling.
+
 2019-10-14  Alan Modra  <amodra@gmail.com>
 
 	* objcopy.c (compare_section_lma): Correct comment.  Dereference
diff --git a/binutils/ar.c b/binutils/ar.c
index b99afff..38c54c9 100644
--- a/binutils/ar.c
+++ b/binutils/ar.c
@@ -1200,6 +1200,9 @@ write_archive (bfd *iarch)
   if (deterministic)
     obfd->flags |= BFD_DETERMINISTIC_OUTPUT;
 
+  if (full_pathname)
+    obfd->flags |= BFD_ARCHIVE_FULL_PATH;
+
   if (make_thin_archive || bfd_is_thin_archive (iarch))
     bfd_set_thin_archive (obfd, TRUE);
 
diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi
index 4e10cdc..2edd7e1 100644
--- a/binutils/doc/binutils.texi
+++ b/binutils/doc/binutils.texi
@@ -387,7 +387,10 @@ use the @samp{v} modifier with this operation, to request that
 If you do not specify a @var{member}, all files in the archive
 are extracted.
 
-Files cannot be extracted from a thin archive.
+Files cannot be extracted from a thin archive, and there are
+restrictions on extracting from archives created with @option{P}: The
+paths must not be absolute, may not contain @code{..}, and any
+subdirectories in the paths must exist.
 @end table
 
 A number of modifiers (@var{mod}) may immediately follow the @var{p}
@@ -463,12 +466,20 @@ Display member offsets inside the archive. Use together with the @samp{t}
 option.
 
 @item P
-Use the full path name when matching names in the archive.  @sc{gnu}
-@command{ar} can not create an archive with a full path name (such archives
-are not POSIX compliant), but other archive creators can.  This option
-will cause @sc{gnu} @command{ar} to match file names using a complete path
-name, which can be convenient when extracting a single file from an
-archive created by another tool.
+Use the full path name when matching or storing names in the archive.
+Archives created with full path names are not POSIX compliant, and
+thus may not work with tools other than up to date @sc{gnu} tools.
+Modifying such archives with @sc{gnu} @command{ar} without using
+@option{P} will remove the full path names unless the archive is a
+thin archive.  Note that @option{P} may be useful when adding files to
+a thin archive since @option{r} without @option{P} ignores the path
+when choosing which element to replace.  Thus
+@smallexample
+ar rcST archive.a subdir/file1 subdir/file2 file1
+@end smallexample
+will result in the first @code{subdir/file1} being replaced with
+@code{file1} from the current directory.  Adding @option{P} will
+prevent this replacement.
 
 @item s
 @cindex writing archive index
@@ -533,7 +544,7 @@ and then exits.
 Displays the version information of @command{ar} and then exits.
 
 @item -X32_64
-@command{ar} ignores an initial option spelt @samp{-X32_64}, for
+@command{ar} ignores an initial option spelled @samp{-X32_64}, for
 compatibility with AIX.  The behaviour produced by this option is the
 default for @sc{gnu} @command{ar}.  @command{ar} does not support any
 of the other @samp{-X} options; in particular, it does not support