ELF: Don't warn an empty PT_LOAD with the program headers

When rewriting the program headers, don't warn an empty PT_LOAD with the
program headers.

bfd/

	PR binutils/30508
	* elf.c (rewrite_elf_program_header): Don't warn if an empty
	PT_LOAD contains the program headers.

ld/

	PR binutils/30508
	* testsuite/ld-elf/pr30508.d: New file.
	* testsuite/ld-elf/pr30508.s: Likewise.

bfd/elf.c

@@ -7210,10 +7210,12 @@ rewrite_elf_program_header (bfd *ibfd, bfd *obfd, bfd_vma maxpagesize)
 	     no sections, but ordinary, loadable segments should contain
 	     something.  They are allowed by the ELF spec however, so only
 	     a warning is produced.
+	     Don't warn if an empty PT_LOAD contains the program headers.
 	     There is however the valid use case of embedded systems which
 	     have segments with p_filesz of 0 and a p_memsz > 0 to initialize
 	     flash memory with zeros.  No warning is shown for that case.  */
 	  if (segment->p_type == PT_LOAD
+	      && !map->includes_phdrs
 	      && (segment->p_filesz > 0 || segment->p_memsz == 0))
 	    /* xgettext:c-format */
 	    _bfd_error_handler

ld/testsuite/ld-elf/pr30508.d

@@ -0,0 +1,13 @@
+#ld: -z separate-code
+#objcopy_linked_file: -R .foo
+#readelf: -lW
+#target: *-*-linux-gnu *-*-gnu* *-*-nacl* arm*-*-uclinuxfdpiceabi
+#xfail: h8300-*-* mips*-*-* rx-*-linux*
+
+#...
+ Section to Segment mapping:
+  Segment Sections...
+#...
+   0.     
+#...
+   0.     .text 

ld/testsuite/ld-elf/pr30508.s

@@ -0,0 +1,14 @@
+	.text
+	.global start	/* Used by SH targets.  */
+start:
+	.global _start
+_start:
+	.global __start
+__start:
+	.global main	/* Used by HPPA targets.  */
+main:
+	.globl	_main	/* Used by LynxOS targets.  */
+_main:
+	.dc.a 0
+	.section .foo,"ax",%progbits
+	.dc.a 0