bfd: Close the file descriptor if there is no archive fd

Close the file descriptor if there is no archive plugin file descriptor
to avoid running out of file descriptors on thin archives with many
archive members.

bfd/

	PR ld/28138
	* plugin.c (bfd_plugin_close_file_descriptor): Close the file
	descriptor there is no archive plugin file descriptor.

ld/

	PR ld/28138
	* testsuite/ld-plugin/lto.exp: Run ld/28138 tests.
	* testsuite/ld-plugin/pr28138.c: New file.
	* testsuite/ld-plugin/pr28138-1.c: Likewise.
	* testsuite/ld-plugin/pr28138-2.c: Likewise.
	* testsuite/ld-plugin/pr28138-3.c: Likewise.
	* testsuite/ld-plugin/pr28138-4.c: Likewise.
	* testsuite/ld-plugin/pr28138-5.c: Likewise.
	* testsuite/ld-plugin/pr28138-6.c: Likewise.
	* testsuite/ld-plugin/pr28138-7.c: Likewise.

10 files changed, 100 insertions, 0 deletions

diff --git a/bfd/plugin.c b/bfd/plugin.c
index 6cfa2b6..3bab8fe 100644
--- a/bfd/plugin.c
+++ b/bfd/plugin.c
@@ -291,6 +291,14 @@ bfd_plugin_close_file_descriptor (bfd *abfd, int fd)
 	     && !bfd_is_thin_archive (abfd->my_archive))
 	abfd = abfd->my_archive;
 
+      /* Close the file descriptor if there is no archive plugin file
+	 descriptor.  */
+      if (abfd->archive_plugin_fd == -1)
+	{
+	  close (fd);
+	  return;
+	}
+
       abfd->archive_plugin_fd_open_count--;
       /* Dup the archive plugin file descriptor for later use, which
 	 will be closed by _bfd_archive_close_and_cleanup.  */
diff --git a/ld/testsuite/ld-plugin/lto.exp b/ld/testsuite/ld-plugin/lto.exp
index def69e4..63be062 100644
--- a/ld/testsuite/ld-plugin/lto.exp
+++ b/ld/testsuite/ld-plugin/lto.exp
@@ -930,4 +930,34 @@ if { [check_lto_fat_available] } {
     }
 }
 
+run_cc_link_tests [list \
+    [list \
+	"Build pr28138.a" \
+	"-T" "" \
+	{pr28138-1.c pr28138-2.c pr28138-3.c pr28138-4.c pr28138-5.c \
+	 pr28138-6.c pr28138-7.c} {} "pr28138.a" \
+    ] \
+    [list \
+	"Build pr28138.o" \
+	"" "" \
+	{pr28138.c} {} \
+    ] \
+]
+
+set exec_output [run_host_cmd "sh" \
+			      "-c \"ulimit -n 20; \
+			      $CC -Btmpdir/ld -o tmpdir/pr28138 \
+			      tmpdir/pr28138.o tmpdir/pr28138.a\""]
+set exec_output [prune_warnings $exec_output]
+if [string match "" $exec_output] then {
+    set exec_output [run_host_cmd "tmpdir/pr28138" ""]
+    if [string match "PASS" $exec_output] then {
+	pass "PR ld/28138"
+    } else {
+	fail "PR ld/28138"
+    }
+} else {
+    fail "PR ld/28138"
+}
+
 restore_notify
diff --git a/ld/testsuite/ld-plugin/pr28138-1.c b/ld/testsuite/ld-plugin/pr28138-1.c
new file mode 100644
index 0000000..51d119e
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr28138-1.c
@@ -0,0 +1,6 @@
+extern int a0(void);
+int
+a1(void)
+{
+  return 1 + a0();
+}
diff --git a/ld/testsuite/ld-plugin/pr28138-2.c b/ld/testsuite/ld-plugin/pr28138-2.c
new file mode 100644
index 0000000..1120cd7
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr28138-2.c
@@ -0,0 +1,6 @@
+extern int a1(void);
+int
+a2(void)
+{
+  return 1 + a1();
+}
diff --git a/ld/testsuite/ld-plugin/pr28138-3.c b/ld/testsuite/ld-plugin/pr28138-3.c
new file mode 100644
index 0000000..ec46494
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr28138-3.c
@@ -0,0 +1,6 @@
+extern int a2(void);
+int
+a3(void)
+{
+  return 1 + a2();
+}
diff --git a/ld/testsuite/ld-plugin/pr28138-4.c b/ld/testsuite/ld-plugin/pr28138-4.c
new file mode 100644
index 0000000..475701b
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr28138-4.c
@@ -0,0 +1,6 @@
+extern int a3(void);
+int
+a4(void)
+{
+  return 1 + a3();
+}
diff --git a/ld/testsuite/ld-plugin/pr28138-5.c b/ld/testsuite/ld-plugin/pr28138-5.c
new file mode 100644
index 0000000..e24f86c
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr28138-5.c
@@ -0,0 +1,6 @@
+extern int a4(void);
+int
+a5(void)
+{
+  return 1 + a4();
+}
diff --git a/ld/testsuite/ld-plugin/pr28138-6.c b/ld/testsuite/ld-plugin/pr28138-6.c
new file mode 100644
index 0000000..b5b938b
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr28138-6.c
@@ -0,0 +1,6 @@
+extern int a5(void);
+int
+a6(void)
+{
+  return 1 + a5();
+}
diff --git a/ld/testsuite/ld-plugin/pr28138-7.c b/ld/testsuite/ld-plugin/pr28138-7.c
new file mode 100644
index 0000000..4ef75bf
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr28138-7.c
@@ -0,0 +1,6 @@
+extern int a6(void);
+int
+a7(void)
+{
+  return 1 + a6();
+}
diff --git a/ld/testsuite/ld-plugin/pr28138.c b/ld/testsuite/ld-plugin/pr28138.c
new file mode 100644
index 0000000..68252c9
--- /dev/null
+++ b/ld/testsuite/ld-plugin/pr28138.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+extern int a7(void);
+
+int
+a0(void)
+{
+  return 0;
+}
+
+int
+main()
+{
+  if (a7() == 7)
+    {
+      printf ("PASS\n");
+      return 0;
+    }
+  return 1;
+}