[ELF] Support (TYPE=<value>) to customize the output section type
The current output section type allows to set the ELF section type to
SHT_PROGBITS or SHT_NOLOAD. This patch allows an arbitrary section value
to be specified. Some common SHT_* literal names are supported as well.
```
SECTIONS {
note (TYPE=SHT_NOTE) : { BYTE(8) *(note) }
init_array ( TYPE=14 ) : { QUAD(14) }
fini_array (TYPE = SHT_FINI_ARRAY) : { QUAD(15) }
}
```
When `sh_type` is specified, it is an error if an input section has a different type.
Our syntax is compatible with GNU ld 2.39 (https://sourceware.org/bugzilla/show_bug.cgi?id=28841).
Reviewed By: peter.smith
Differential Revision: https://reviews.llvm.org/D118840
diff --git a/lld/docs/ELF/linker_script.rst b/lld/docs/ELF/linker_script.rst
index b94017b..085b3aa 100644
--- a/lld/docs/ELF/linker_script.rst
+++ b/lld/docs/ELF/linker_script.rst
@@ -102,6 +102,12 @@
- ``NOLOAD``: set ``sh_type`` to ``SHT_NOBITS``.
- ``COPY``, ``INFO``, ``OVERLAY``: clear the ``SHF_ALLOC`` bit in ``sh_flags``.
+- ``TYPE=<value>``: set ``sh_type`` to the specified value. ``<value>`` must be
+ an integer or one of ``SHT_PROGBITS, SHT_NOTE, SHT_NOBITS, SHT_INIT_ARRAY,
+ SHT_FINI_ARRAY, SHT_PREINIT_ARRAY``.
+
+When ``sh_type`` is specified, it is an error if an input section in *S* has a
+different type.
Output section alignment
------------------------
