[PATCH] ld/ELF: explicitly place .note.gnu.property

[Jan Beulich]

x86 gas may produce .note.gnu.property by default. Hence the default
linker script would better also deal with that section, rather than
causing diagnostics when using --orphan-handling=. As the origin of the
(seemingly mis-spelled) .note.gnu-property there is unclear, leave that
in place.
---
Furthermore, the comment ahead of this block of directives has gone
stale with, afaict, the placement of .note.gnu.build-id near the
program headers: Orphan note sections are placed adjacent to that one if
--build-id= is in use. This pretty certainly wasn't intended, so may
also want/need fixing.

The testsuite adjustment is likely wrong to make, but I can't seem to
be able to figure what's going on for powerpc64-linux: .eh_frame,
despite being empty as before, suddenly has SEC_KEEP set (by
gc_section_callback() as invoked from lang_gc_sections_1(), in
accordance with the linker script using KEEP() on the section), and
hence maybe_strip_output() wouldn't remove it anymore. It thus
unexpectedly appears as constituent of the GNU_PROPERTY segment.

Whether the two Arm64 linker tests that use .note.gnu-property are also
screwed I can't easily tell. The linker script fragment (back then in
miscsections.sc) appeared "out of the blue" (7ecf0250f7f0 ["Improve the
placement of orphan note sections"]), so whether some target uses that
section name isn't quite easy to tell. Similarly the addition to the two
testsuite linker scripts appeared with no explanation at all
(1905f68578fa ["AArch64 BTI/PAC PLT tests: remove RWX permissions on
segments"]).

--- a/ld/scripttempl/elf.sc
+++ b/ld/scripttempl/elf.sc
@@ -735,6 +735,7 @@ cat <<EOF
   .note.build-id :      { *(.note.build-id) } ${RELOCATING+${REGION}}
   .note.GNU-stack :     { *(.note.GNU-stack) } ${RELOCATING+${REGION}}
   .note.gnu-property :  { *(.note.gnu-property) } ${RELOCATING+${REGION}}
+  .note.gnu.property :  { *(.note.gnu.property) } ${RELOCATING+${REGION}}
   .note.ABI-tag :       { *(.note.ABI-tag) } ${RELOCATING+${REGION}}
   .note.package :       { *(.note.package) } ${RELOCATING+${REGION}}
   .note.dlopen :        { *(.note.dlopen) } ${RELOCATING+${REGION}}
--- a/ld/testsuite/ld-elf/elf.exp
+++ b/ld/testsuite/ld-elf/elf.exp
@@ -86,6 +86,9 @@ run_ld_link_tests [list \
 
 if [is_elf64 tmpdir/symbol3w.a] {
     set ASFLAGS "$ASFLAGS --defsym ALIGN=3"
+    if { [istarget powerpc*-*-linux*] } {
+	set LDFLAGS "$LDFLAGS --no-ld-generated-unwind-info"
+    }
     set pr23900_1_exp "pr23900-1-64.rd"
     set pr25490_2_exp "pr25490-2-64.rd"
     set pr25490_3_exp "pr25490-3-64.rd"