[gcc/devel/rust/master] rust: Implement TARGET_RUST_OS_INFO for *-*-*linux*.

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

https://gcc.gnu.org/g:a02750e8dd5e400f990dff1c6e8911f713af6cf2

commit a02750e8dd5e400f990dff1c6e8911f713af6cf2
Author: Iain Buclaw <ibuclaw@gdcproject.org>
Date:   Thu Oct 13 16:42:23 2022 +0200

    rust: Implement TARGET_RUST_OS_INFO for *-*-*linux*.
    
    gcc/ChangeLog:
    
            * config.gcc (*linux*): Set rust target_objs, and
              target_has_targetrustm,
            * config/t-linux (linux-rust.o): New rule.
            * config/linux-rust.cc: New file.

Diff:
---
 gcc/config.gcc           |  6 +++++
 gcc/config/linux-rust.cc | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
 gcc/config/t-linux       |  4 ++++
 3 files changed, 67 insertions(+)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 3996ede2287..7a2daa98b93 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -919,6 +919,12 @@ case ${target} in
       gcc_cv_initfini_array=yes
       ;;
   esac
+  case $target in
+    *linux*)
+      rust_target_objs="${rust_target_objs} linux-rust.o"
+      target_has_targetrustm=yes
+      ;;
+  esac
   ;;
 *-*-netbsd*)
   tm_p_file="${tm_p_file} netbsd-protos.h"
diff --git a/gcc/config/linux-rust.cc b/gcc/config/linux-rust.cc
new file mode 100644
index 00000000000..3eaa91818ff
--- /dev/null
+++ b/gcc/config/linux-rust.cc
@@ -0,0 +1,57 @@
+/* Linux support needed only by Rust front-end.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "tm_rust.h"
+#include "rust/rust-target.h"
+#include "rust/rust-target-def.h"
+
+/* `-mandroid' is not available as an command-line option.  */
+#ifndef TARGET_ANDROID
+#define TARGET_ANDROID 0
+#endif
+
+/* Implement TARGET_RUST_OS_INFO for Linux targets.  */
+
+static void
+linux_rust_target_os_info (void)
+{
+  rust_add_target_info ("target_family", "unix");
+  rust_add_target_info ("target_vendor", "unknown");
+
+  if (TARGET_ANDROID)
+    rust_add_target_info ("target_os", "android");
+  else
+    rust_add_target_info ("target_os", "linux");
+
+  if (OPTION_GLIBC)
+    rust_add_target_info ("target_env", "gnu");
+  else if (OPTION_MUSL)
+    rust_add_target_info ("target_env", "musl");
+  else if (OPTION_UCLIBC)
+    rust_add_target_info ("target_env", "uclibc");
+  else
+    rust_add_target_info ("target_env", "");
+}
+
+#undef TARGET_RUST_OS_INFO
+#define TARGET_RUST_OS_INFO linux_rust_target_os_info
+
+struct gcc_targetrustm targetrustm = TARGETRUSTM_INITIALIZER;
diff --git a/gcc/config/t-linux b/gcc/config/t-linux
index d9bc9b8c9bf..8404e14ba49 100644
--- a/gcc/config/t-linux
+++ b/gcc/config/t-linux
@@ -19,3 +19,7 @@
 linux.o: $(srcdir)/config/linux.cc
 	  $(COMPILE) $<
 	  $(POSTCOMPILE)
+
+linux-rust.o: $(srcdir)/config/linux-rust.cc
+	  $(COMPILE) $<
+	  $(POSTCOMPILE)