rust: Reintroduce TARGET_RUST_OS_INFO hook

gcc/ChangeLog:

	* doc/tm.texi: Regenerate.
	* doc/tm.texi.in: Document TARGET_RUST_OS_INFO.

gcc/rust/ChangeLog:

	* rust-session-manager.cc (Session::init): Call
	targetrustm.rust_os_info.
	* rust-target.def (rust_os_info): New hook.

4 files changed, 16 insertions, 0 deletions

diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index f7a2f8b..b077972 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -10975,6 +10975,11 @@ Configuration pairs predefined by this hook apply to all files that are being
 compiled.
 @end deftypefn
 
+@deftypefn {Rust Target Hook} void TARGET_RUST_OS_INFO (void)
+Similar to @code{TARGET_RUST_CPU_INFO}, but is used for configuration info
+relating to the target operating system.
+@end deftypefn
+
 @node Named Address Spaces
 @section Adding support for named address spaces
 @cindex named address spaces
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index cd4e687..d3e1895 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -7150,6 +7150,8 @@ floating-point support; they are not included in this mechanism.
 
 @hook TARGET_RUST_CPU_INFO
 
+@hook TARGET_RUST_OS_INFO
+
 @node Named Address Spaces
 @section Adding support for named address spaces
 @cindex named address spaces
diff --git a/gcc/rust/rust-session-manager.cc b/gcc/rust/rust-session-manager.cc
index 112960a..ce1fdbb 100644
--- a/gcc/rust/rust-session-manager.cc
+++ b/gcc/rust/rust-session-manager.cc
@@ -140,6 +140,7 @@ Session::init ()
 {
   // initialize target hooks
   targetrustm.rust_cpu_info ();
+  targetrustm.rust_os_info ();
 
   // target-independent values that should exist in all targets
   options.target_data.insert_key_value_pair ("target_pointer_width",
diff --git a/gcc/rust/rust-target.def b/gcc/rust/rust-target.def
index 285b7503..9c72c1c 100644
--- a/gcc/rust/rust-target.def
+++ b/gcc/rust/rust-target.def
@@ -40,5 +40,13 @@ compiled.",
  void, (void),
  hook_void_void)
 
+/* Environmental OS info relating to the target OS.  */
+DEFHOOK
+(rust_os_info,
+ "Similar to @code{TARGET_RUST_CPU_INFO}, but is used for configuration info\n\
+relating to the target operating system.",
+ void, (void),
+ hook_void_void)
+
 /* Close the 'struct gcc_targetrustm' definition.  */
 HOOK_VECTOR_END (C90_EMPTY_HACK)