Make sure that undefined symbols added to the linker command line via the -u option appear in the output executable, if they have not been resolved.

	PR 22319
bfd	* elflink.c (elf_link_output_extsym): Keep global undefined
	symbols if they have been marked as needed.

ld	* testsuite/ld-elf/pr22310.s: New test source file.
	* testsuite/ld-elf/pr22310.d: New test driver.
	* testsuite/ld-mmix/undef-3.d: Update expected output from readelf.

1 files changed, 9 insertions, 8 deletions

diff --git a/ld/testsuite/ld-mmix/undef-3.d b/ld/testsuite/ld-mmix/undef-3.d
index 6afb52b8afa..2484d762c16 100644
--- a/ld/testsuite/ld-mmix/undef-3.d
+++ b/ld/testsuite/ld-mmix/undef-3.d
@@ -12,20 +12,21 @@ Section Headers:
  +\[ 1\] \.text +PROGBITS +0+ +0+78
  +0+4 +0+ +AX +0 +0 +4
  +\[ 2\] \.symtab +SYMTAB +0+ .*
- +0+a8 +0+18 +3 +2 +8
+ +0+c0 +0+18 +3 +2 +8
  +\[ 3\] \.strtab +STRTAB +0+ .*
- +0+21 +0+ +0 +0 +1
+ +0+28 +0+ +0 +0 +1
  +\[ 4\] \.shstrtab +STRTAB +0+ +[0-9a-f]+
  +0+21 +0+ +0 +0 +1
 Key to Flags:
 #...
 
-Symbol table '\.symtab' contains 7 entries:
+Symbol table '\.symtab' contains 8 entries:
  +Num: +Value +Size +Type +Bind +Vis +Ndx +Name
  +0: 0+ +0 +NOTYPE +LOCAL +DEFAULT +UND 
  +1: 0+ +0 +SECTION +LOCAL +DEFAULT +1 
- +2: 0+ +0 +NOTYPE +GLOBAL +DEFAULT +1 _start
- +3: 2000000000000000 +0 +NOTYPE +GLOBAL +DEFAULT +1 __bss_start
- +4: 2000000000000000 +0 +NOTYPE +GLOBAL +DEFAULT +1 _edata
- +5: 2000000000000000 +0 +NOTYPE +GLOBAL +DEFAULT +1 _end
- +6: 0+ +0 +NOTYPE +GLOBAL +DEFAULT +1 _start\.
+[ 	]+2: 0+[ 	]+0[ 	]+NOTYPE[ 	]+GLOBAL[ 	]+DEFAULT[ 	]+UND[ 	]+undefd
+ +3: 0+ +0 +NOTYPE +GLOBAL +DEFAULT +1 _start
+ +4: 2000000000000000 +0 +NOTYPE +GLOBAL +DEFAULT +1 __bss_start
+ +5: 2000000000000000 +0 +NOTYPE +GLOBAL +DEFAULT +1 _edata
+ +6: 2000000000000000 +0 +NOTYPE +GLOBAL +DEFAULT +1 _end
+ +7: 0+ +0 +NOTYPE +GLOBAL +DEFAULT +1 _start\.