+@item unique
+@itemx nounique
+When generating a shared library or other dynamically loadable ELF
+object mark it as one that should (by default) only ever be loaded once,
+and only in the main namespace (when using @code{dlmopen}). This is
+primarily used to mark fundamental libraries such as libc, libpthread et
+al which do not usually function correctly unless they are the sole instances
+of themselves. This behaviour can be overridden by the @code{dlmopen} caller
+and does not apply to certain loading mechanisms (such as audit libraries).
+
+@item lam-u48
+Generate GNU_PROPERTY_X86_FEATURE_1_LAM_U48 in .note.gnu.property section
+to indicate compatibility with Intel LAM_U48. Supported for Linux/x86_64.
+
+@item lam-u57
+Generate GNU_PROPERTY_X86_FEATURE_1_LAM_U57 in .note.gnu.property section
+to indicate compatibility with Intel LAM_U57. Supported for Linux/x86_64.
+
+@item lam-u48-report=none
+@itemx lam-u48-report=warning
+@itemx lam-u48-report=error
+Specify how to report the missing GNU_PROPERTY_X86_FEATURE_1_LAM_U48
+property in input .note.gnu.property section.
+@option{lam-u48-report=none}, which is the default, will make the
+linker not report missing properties in input files.
+@option{lam-u48-report=warning} will make the linker issue a warning for
+missing properties in input files. @option{lam-u48-report=error} will
+make the linker issue an error for missing properties in input files.
+Supported for Linux/x86_64.
+
+@item lam-u57-report=none
+@itemx lam-u57-report=warning
+@itemx lam-u57-report=error
+Specify how to report the missing GNU_PROPERTY_X86_FEATURE_1_LAM_U57
+property in input .note.gnu.property section.
+@option{lam-u57-report=none}, which is the default, will make the
+linker not report missing properties in input files.
+@option{lam-u57-report=warning} will make the linker issue a warning for
+missing properties in input files. @option{lam-u57-report=error} will
+make the linker issue an error for missing properties in input files.
+Supported for Linux/x86_64.
+
+@item lam-report=none
+@itemx lam-report=warning
+@itemx lam-report=error
+Specify how to report the missing GNU_PROPERTY_X86_FEATURE_1_LAM_U48 and
+GNU_PROPERTY_X86_FEATURE_1_LAM_U57 properties in input .note.gnu.property
+section. @option{lam-report=none}, which is the default, will make the
+linker not report missing properties in input files.
+@option{lam-report=warning} will make the linker issue a warning for
+missing properties in input files. @option{lam-report=error} will make
+the linker issue an error for missing properties in input files.
+Supported for Linux/x86_64.
+