[gcc/devel/rust/master] rust: Reintroduce TARGET_RUST_OS_INFO hook

[Thomas Schwinge <tschwinge@gcc.gnu.org>]

https://gcc.gnu.org/g:b220923f96344397c584245c09234a700b0ca243

commit b220923f96344397c584245c09234a700b0ca243
Author: Iain Buclaw <ibuclaw@gdcproject.org>
Date:   Wed Sep 28 15:33:41 2022 +0200

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

Diff:
---
 gcc/doc/tm.texi                  | 5 +++++
 gcc/doc/tm.texi.in               | 2 ++
 gcc/rust/rust-session-manager.cc | 1 +
 gcc/rust/rust-target.def         | 8 ++++++++
 4 files changed, 16 insertions(+)

diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 638296d6fb9..75ae4b2aebe 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -10895,6 +10895,11 @@ 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 911d5dca4e6..c8c2b8bd83c 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -7134,6 +7134,8 @@ 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 0947c18152c..ef1a85d9a56 100644
--- a/gcc/rust/rust-session-manager.cc
+++ b/gcc/rust/rust-session-manager.cc
@@ -138,6 +138,7 @@ 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 285b7503528..9c72c1c86d3 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)