powerpc: Link warning for orphan sections

Add --orphan-handling=warn to final link flags. This ensures we can
handle all sections explicitly. This would have caught subtle breakage
such as 7de3b27bac47da9de08409df1d69664acbb72197 at build-time.

Also bring existing orphan sections into the fold:
- .text.hot and .text.unlikely are compiler generated sections.
- .sdata2, .dynsbss, .plt are used by PPC32
- We previously did not specify DWARF_DEBUG or STABS_DEBUG
- DWARF_DEBUG did not include all DWARF sections that can be emitted
- A number of sections are unused and can be discarded.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 314a0b9219c6..9862afb3ae05 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -595,6 +595,7 @@
 #define SBSS(sbss_align)                                                \
         . = ALIGN(sbss_align);                                          \
         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
+                *(.dynsbss)                                             \
                 *(.sbss)                                                \
                 *(.scommon)                                             \
         }
@@ -641,11 +642,22 @@
                 .debug_str      0 : { *(.debug_str) }                   \
                 .debug_loc      0 : { *(.debug_loc) }                   \
                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
+                .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
+                /* DWARF 3 */                                           \
+                .debug_ranges   0 : { *(.debug_ranges) }                \
                 /* SGI/MIPS DWARF 2 extensions */                       \
                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
                 .debug_typenames 0 : { *(.debug_typenames) }            \
                 .debug_varnames  0 : { *(.debug_varnames) }             \
+                /* GNU DWARF 2 extensions */                            \
+                .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
+                .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
+                /* DWARF 4 */                                           \
+                .debug_types    0 : { *(.debug_types) }                 \
+                /* DWARF 5 */                                           \
+                .debug_macro    0 : { *(.debug_macro) }                 \
+                .debug_addr     0 : { *(.debug_addr) }
 
                 /* Stabs debugging sections.  */
 #define STABS_DEBUG                                                     \