gcc: loongarch basic uClibc support

target/config/Config.in.libc

@@ -25,6 +25,7 @@ config ADK_TARGET_LIB_UCLIBC_NG
 		ADK_TARGET_ARCH_IA64 || \
 		ADK_TARGET_ARCH_KVX || \
 		ADK_TARGET_ARCH_LM32 || \
+		ADK_TARGET_ARCH_LOONGARCH || \
 		ADK_TARGET_ARCH_M68K || \
 		ADK_TARGET_ARCH_METAG || \
 		ADK_TARGET_ARCH_MICROBLAZE || \

target/loongarch/uclibc-ng.config

@@ -0,0 +1,229 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# uClibc-ng 1.0.58 C Library Configuration
+#
+# TARGET_aarch64 is not set
+# TARGET_alpha is not set
+# TARGET_arc is not set
+# TARGET_arm is not set
+# TARGET_avr32 is not set
+# TARGET_bfin is not set
+# TARGET_c6x is not set
+# TARGET_cris is not set
+# TARGET_csky is not set
+# TARGET_frv is not set
+# TARGET_h8300 is not set
+# TARGET_hppa is not set
+# TARGET_i386 is not set
+# TARGET_ia64 is not set
+# TARGET_kvx is not set
+# TARGET_lm32 is not set
+TARGET_loongarch=y
+# TARGET_m68k is not set
+# TARGET_metag is not set
+# TARGET_microblaze is not set
+# TARGET_mips is not set
+# TARGET_nds32 is not set
+# TARGET_nios2 is not set
+# TARGET_or1k is not set
+# TARGET_powerpc is not set
+# TARGET_riscv64 is not set
+# TARGET_riscv32 is not set
+# TARGET_sh is not set
+# TARGET_sparc is not set
+# TARGET_sparc64 is not set
+# TARGET_tile is not set
+# TARGET_x86_64 is not set
+# TARGET_xtensa is not set
+TARGET_LDSO_NAME="ld-uClibc"
+TARGET_ARCH_BITS=32
+
+#
+# Target Architecture Features and Options
+#
+TARGET_ARCH="loongarch"
+FORCE_OPTIONS_FOR_ARCH=y
+TARGET_SUBARCH=""
+
+#
+# Using ELF file format
+#
+ARCH_LITTLE_ENDIAN=y
+
+#
+# Using Little Endian
+#
+ARCH_HAS_MMU=y
+ARCH_USE_MMU=y
+UCLIBC_HAS_FLOATS=y
+UCLIBC_HAS_FPU=y
+DO_C99_MATH=y
+DO_XSI_MATH=y
+UCLIBC_HAS_LONG_DOUBLE_MATH=y
+KERNEL_HEADERS=""
+HAVE_DOT_CONFIG=y
+
+#
+# General Library Settings
+#
+DOPIC=y
+ARCH_HAS_NO_SHARED=y
+ARCH_HAS_NO_LDSO=y
+UCLIBC_CTOR_DTOR=y
+HAS_NO_THREADS=y
+# UCLIBC_HAS_LINUXTHREADS is not set
+# UCLIBC_HAS_THREADS_NATIVE is not set
+PTHREADS_STACK_DEFAULT_SIZE=2097152
+UCLIBC_HAS_SYSLOG=y
+UCLIBC_HAS_LFS=y
+MALLOC=y
+# MALLOC_SIMPLE is not set
+# MALLOC_STANDARD is not set
+UCLIBC_DYNAMIC_ATEXIT=y
+UCLIBC_HAS_UTMPX=y
+UCLIBC_HAS_UTMP=y
+UCLIBC_SUSV2_LEGACY=y
+UCLIBC_SUSV3_LEGACY=y
+# UCLIBC_SUSV3_LEGACY_MACROS is not set
+UCLIBC_SUSV4_LEGACY=y
+# UCLIBC_STRICT_HEADERS is not set
+# UCLIBC_HAS_STUBS is not set
+UCLIBC_HAS_SHADOW=y
+UCLIBC_HAS_PROGRAM_INVOCATION_NAME=y
+UCLIBC_HAS___PROGNAME=y
+UCLIBC_HAS_PTY=y
+ASSUME_DEVPTS=y
+UNIX98PTY_ONLY=y
+UCLIBC_HAS_GETPT=y
+UCLIBC_HAS_LIBUTIL=y
+UCLIBC_HAS_TM_EXTENSIONS=y
+UCLIBC_HAS_TZ_CACHING=y
+UCLIBC_HAS_TZ_FILE=y
+UCLIBC_HAS_TZ_FILE_READ_MANY=y
+UCLIBC_TZ_FILE_PATH="/etc/TZ"
+UCLIBC_FALLBACK_TO_ETC_LOCALTIME=y
+
+#
+# Advanced Library Settings
+#
+UCLIBC_PWD_BUFFER_SIZE=256
+UCLIBC_GRP_BUFFER_SIZE=256
+
+#
+# Support various families of functions
+#
+UCLIBC_LINUX_SPECIFIC=y
+UCLIBC_HAS_GNU_ERROR=y
+UCLIBC_BSD_SPECIFIC=y
+UCLIBC_HAS_BSD_ERR=y
+UCLIBC_HAS_OBSOLETE_BSD_SIGNAL=y
+# UCLIBC_HAS_BSD_B64_NTOP_B64_PTON is not set
+# UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL is not set
+# UCLIBC_NTP_LEGACY is not set
+UCLIBC_SV4_DEPRECATED=y
+UCLIBC_HAS_REALTIME=y
+UCLIBC_HAS_ADVANCED_REALTIME=y
+UCLIBC_HAS_EPOLL=y
+UCLIBC_HAS_XATTR=y
+# UCLIBC_HAS_PROFILING is not set
+UCLIBC_HAS_CRYPT_IMPL=y
+UCLIBC_HAS_SHA256_CRYPT_IMPL=y
+UCLIBC_HAS_SHA512_CRYPT_IMPL=y
+UCLIBC_HAS_CRYPT=y
+UCLIBC_HAS_NETWORK_SUPPORT=y
+UCLIBC_HAS_SOCKET=y
+UCLIBC_HAS_IPV4=y
+UCLIBC_HAS_IPV6=y
+UCLIBC_USE_NETLINK=y
+UCLIBC_SUPPORT_AI_ADDRCONFIG=y
+UCLIBC_HAS_BSD_RES_CLOSE=y
+UCLIBC_HAS_COMPAT_RES_STATE=y
+# UCLIBC_HAS_EXTRA_COMPAT_RES_STATE is not set
+UCLIBC_HAS_RESOLVER_SUPPORT=y
+# UCLIBC_DNSRAND_MODE_URANDOM is not set
+# UCLIBC_DNSRAND_MODE_CLOCK is not set
+UCLIBC_DNSRAND_MODE_PRNGPLUS=y
+# UCLIBC_DNSRAND_MODE_SIMPLECOUNTER is not set
+
+#
+# String and Stdio Support
+#
+UCLIBC_HAS_STRING_GENERIC_OPT=y
+UCLIBC_HAS_STRING_ARCH_OPT=y
+UCLIBC_HAS_CTYPE_TABLES=y
+UCLIBC_HAS_CTYPE_SIGNED=y
+# UCLIBC_HAS_CTYPE_UNSAFE is not set
+UCLIBC_HAS_CTYPE_CHECKED=y
+# UCLIBC_HAS_CTYPE_ENFORCED is not set
+UCLIBC_HAS_WCHAR=y
+UCLIBC_HAS_UCHAR=y
+# UCLIBC_HAS_LIBICONV is not set
+# UCLIBC_HAS_LIBINTL is not set
+# UCLIBC_HAS_LOCALE is not set
+UCLIBC_HAS_HEXADECIMAL_FLOATS=y
+UCLIBC_HAS_GLIBC_CUSTOM_PRINTF=y
+UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS=9
+# UCLIBC_HAS_STDIO_BUFSIZ_256 is not set
+# UCLIBC_HAS_STDIO_BUFSIZ_512 is not set
+# UCLIBC_HAS_STDIO_BUFSIZ_1024 is not set
+# UCLIBC_HAS_STDIO_BUFSIZ_2048 is not set
+UCLIBC_HAS_STDIO_BUFSIZ_4096=y
+# UCLIBC_HAS_STDIO_BUFSIZ_8192 is not set
+UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE=y
+# UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4 is not set
+# UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8 is not set
+# UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT is not set
+UCLIBC_HAS_STDIO_GETC_MACRO=y
+UCLIBC_HAS_STDIO_PUTC_MACRO=y
+UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION=y
+# UCLIBC_HAS_FOPEN_LARGEFILE_MODE is not set
+UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE=y
+UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE=y
+UCLIBC_HAS_GLIBC_CUSTOM_STREAMS=y
+UCLIBC_HAS_PRINTF_M_SPEC=y
+UCLIBC_HAS_ERRNO_MESSAGES=y
+# UCLIBC_HAS_SYS_ERRLIST is not set
+UCLIBC_HAS_SIGNUM_MESSAGES=y
+# UCLIBC_HAS_SYS_SIGLIST is not set
+UCLIBC_HAS_GNU_GETOPT=y
+UCLIBC_HAS_GETOPT_LONG=y
+UCLIBC_HAS_GNU_GETSUBOPT=y
+UCLIBC_HAS_ARGP=y
+
+#
+# Big and Tall
+#
+UCLIBC_HAS_REGEX=y
+UCLIBC_HAS_FNMATCH=y
+UCLIBC_HAS_WORDEXP=y
+UCLIBC_HAS_NFTW=y
+UCLIBC_HAS_FTW=y
+UCLIBC_HAS_FTS=y
+UCLIBC_HAS_GLOB=y
+UCLIBC_HAS_GNU_GLOB=y
+
+#
+# Library Installation Options
+#
+RUNTIME_PREFIX="/"
+DEVEL_PREFIX="/usr/"
+MULTILIB_DIR="lib"
+HARDWIRED_ABSPATH=y
+
+#
+# Security options
+#
+# UCLIBC_HAS_SSP is not set
+UCLIBC_BUILD_NOEXECSTACK=y
+
+#
+# Development/debugging options
+#
+CROSS_COMPILER_PREFIX=""
+UCLIBC_EXTRA_CFLAGS=""
+# DODEBUG is not set
+# DOSTRIP is not set
+# DOASSERTS is not set
+# UCLIBC_MALLOC_DEBUGGING is not set
+WARNINGS="-Wall"
+# EXTRA_WARNINGS is not set

toolchain/gcc/patches/15.3.0/loongarch-uclibc.patch

@@ -0,0 +1,48 @@
+diff -Nur gcc-15.3.0.orig/gcc/config/loongarch/uclibc.h gcc-15.3.0/gcc/config/loongarch/uclibc.h
+--- gcc-15.3.0.orig/gcc/config/loongarch/uclibc.h	1970-01-01 01:00:00.000000000 +0100
++++ gcc-15.3.0/gcc/config/loongarch/uclibc.h	2026-06-28 10:42:54.366223029 +0200
+@@ -0,0 +1,23 @@
++/* Definitions for uCLibc C library support.
++   Copyright (C) 2024-2025 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_UCLIBC
++#define LA_DEFAULT_TARGET_UCLIBC
++#endif
+diff -Nur gcc-15.3.0.orig/gcc/config.gcc gcc-15.3.0/gcc/config.gcc
+--- gcc-15.3.0.orig/gcc/config.gcc	2026-06-12 08:09:06.107518032 +0200
++++ gcc-15.3.0/gcc/config.gcc	2026-06-28 10:47:51.591407374 +0200
+@@ -2588,6 +2588,9 @@
+ 	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"
++	  ;;
++	  *-linux-uclibc*) tm_file="${tm_file} loongarch/uclibc.h"
++	  ;;
+ 	esac
+ 	tm_file="${tm_file} loongarch/gnu-user.h loongarch/linux.h loongarch/loongarch-driver.h"
+ 	extra_options="${extra_options} linux-android.opt"
+@@ -5108,6 +5111,7 @@
+ 		case ${target} in
+ 		  *-linux-gnu*) triplet_os="linux-gnu";;
+ 		  *-linux-musl*) triplet_os="linux-musl";;
++		  *-linux-uclibc*) triplet_os="linux-uclibc";;
+ 		  *-elf*) triplet_os="elf";;
+ 		  *)
+ 			  echo "Unsupported target ${target}." 1>&2