[gcc r14-9351] LoongArch: Use /lib instead of /lib64 as the library search path for MUSL.

[gcc r14-9351] LoongArch: Use /lib instead of /lib64 as the library search path for MUSL.

[LuluCheng]

https://gcc.gnu.org/g:2f7d4728dbfd976788f77b8f43d4dc3c718b71b7

commit r14-9351-g2f7d4728dbfd976788f77b8f43d4dc3c718b71b7
Author: Yang Yujie <yangyujie@loongson.cn>
Date:   Wed Mar 6 09:19:59 2024 +0800

    LoongArch: Use /lib instead of /lib64 as the library search path for MUSL.
    
    gcc/ChangeLog:
    
            * config.gcc: Add a case for loongarch*-*-linux-musl*.
            * config/loongarch/linux.h: Disable the multilib-compatible
            treatment for *musl* targets.
            * config/loongarch/musl.h: New file.

Diff:
---
 gcc/config.gcc               |  3 +++
 gcc/config/loongarch/linux.h |  4 +++-
 gcc/config/loongarch/musl.h  | 23 +++++++++++++++++++++++
 3 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index a1480b72c46..624e0dae191 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -2538,6 +2538,9 @@ riscv*-*-freebsd*)
 
 loongarch*-*-linux*)
 	tm_file="elfos.h gnu-user.h linux.h linux-android.h glibc-stdint.h ${tm_file}"
+	case ${target} in
+	  *-linux-musl*) tm_file="${tm_file} loongarch/musl.h"
+	esac
 	tm_file="${tm_file} loongarch/gnu-user.h loongarch/linux.h loongarch/loongarch-driver.h"
 	extra_options="${extra_options} linux-android.opt"
 	tmake_file="${tmake_file} loongarch/t-multilib loongarch/t-linux"
diff --git a/gcc/config/loongarch/linux.h b/gcc/config/loongarch/linux.h
index 17d9f87537b..40d9ba6d405 100644
--- a/gcc/config/loongarch/linux.h
+++ b/gcc/config/loongarch/linux.h
@@ -21,7 +21,9 @@ along with GCC; see the file COPYING3.  If not see
  * This ensures that a compiler configured with --disable-multilib
  * can work in a multilib environment.  */
 
-#if defined(LA_DISABLE_MULTILIB) && defined(LA_DISABLE_MULTIARCH)
+#if !defined(LA_DEFAULT_TARGET_MUSL) \
+  && defined(LA_DISABLE_MULTILIB) \
+  && defined(LA_DISABLE_MULTIARCH)
 
   #if DEFAULT_ABI_BASE == ABI_BASE_LP64D
     #define ABI_LIBDIR "lib64"
diff --git a/gcc/config/loongarch/musl.h b/gcc/config/loongarch/musl.h
new file mode 100644
index 00000000000..fa43bc86606
--- /dev/null
+++ b/gcc/config/loongarch/musl.h
@@ -0,0 +1,23 @@
+/* Definitions for MUSL C library support.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+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/>.  */
+
+
+#ifndef LA_DEFAULT_TARGET_MUSL
+#define LA_DEFAULT_TARGET_MUSL
+#endif