ar: Add --thin for creating thin archives

In many ar implementations (FreeBSD, elfutils, etc), -T has the X/Open
System Interface specified semantics. Therefore -T for thin archives is
not recommended for portability. -T is deprecated without diagnostics.

    PR binutils/28759
    * ar.c (long_options): Add --thin.
    (usage) Add --thin. Deprecate -T without diagnostics.
    * doc/binutils.texi: Add doc.
    * NEWS: Mention --thin.
    * binutils/testsuite/binutils-all/ar.exp: Add tests.

1 files changed, 17 insertions, 0 deletions

diff --git a/binutils/testsuite/binutils-all/ar.exp b/binutils/testsuite/binutils-all/ar.exp
index 12aa079865b..3b841825f6f 100644
--- a/binutils/testsuite/binutils-all/ar.exp
+++ b/binutils/testsuite/binutils-all/ar.exp
@@ -309,11 +309,13 @@ proc thin_archive_with_nested { bfdtests } {
     if [is_remote host] {
 	set archive artest.a
 	set archive2 artest2.a
+	set archive3 artest3.a
 	set objfile [remote_download host tmpdir/bintest.${obj}]
 	remote_file host delete $archive
     } else {
 	set archive tmpdir/artest.a
 	set archive2 tmpdir/artest2.a
+	set archive3 tmpdir/artest3.a
 	set objfile tmpdir/bintest.${obj}
     }
 
@@ -333,6 +335,14 @@ proc thin_archive_with_nested { bfdtests } {
 	return
     }
 
+    remote_file build delete tmpdir/artest3.a
+
+    set got [binutils_run $AR "rc --thin $archive3 ${archive}"]
+    if ![string match "" $got] {
+	fail $testname
+	return
+    }
+
     foreach bfdtest $bfdtests {
 	set exec_output [binutils_run "$base_dir/$bfdtest" "$archive"]
 	if ![string match "" $exec_output] {
@@ -347,6 +357,13 @@ proc thin_archive_with_nested { bfdtests } {
 	    fail "$testname ($bfdtest)"
 	    return
 	}
+
+	set exec_output [binutils_run "$base_dir/$bfdtest" "$archive3"]
+	if ![string match "" $exec_output] {
+	    verbose -log $exec_output
+	    fail "$testname ($bfdtest)"
+	    return
+	}
     }
 
     set got [binutils_run $NM "--print-armap $archive"]