Add support to Alpine (stderr)

Author: wlemkows

.github/docker/alpine-3.20.Dockerfile

@@ -0,0 +1,46 @@
+# Copyright (C) 2025 Intel Corporation
+# Under the Apache License v2.0 with LLVM Exceptions. See LICENSE.TXT.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#
+# Dockerfile - a 'recipe' for Docker to build an image of Alpine
+#              environment for building the Unified Memory Framework project.
+#
+
+# Pull base Alpine image version 3.20
+FROM alpine:3.20
+
+# Set environment variables
+ENV OS alpine
+ENV OS_VER 3.20
+
+# Base development packages
+ARG BASE_DEPS="\
+	cmake \
+	git \
+    g++ \
+    make"
+
+# UMF's dependencies
+ARG UMF_DEPS="\
+	hwloc-dev"
+
+# Add a new (non-root) 'test_user'
+ENV USER test_user
+ENV USERPASS pass
+RUN useradd -m "${USER}" -g sudo -p "$(mkpasswd ${USERPASS})"
+USER test_user
+
+# Update and install required packages
+RUN apk update \
+ && apk add \
+	${BASE_DEPS} \
+	${UMF_DEPS}
+
+# clone the repository
+RUN git clone https://github.com/oneapi-src/unified-memory-framework.git
+
+# build the project
+RUN cd unified-memory-framework \
+cmake -B build -DCMAKE_BUILD_TYPE=Release -DUMF_BUILD_TESTS=ON -DUMF_BUILD_EXAMPLES=OFF \
+cmake --build build

src/utils/utils_log.c

@@ -1,6 +1,6 @@
 /*
  *
- * Copyright (C) 2024 Intel Corporation
+ * Copyright (C) 2024-2025 Intel Corporation
  *
  * Under the Apache License v2.0 with LLVM Exceptions. See LICENSE.TXT.
  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
@@ -10,7 +10,6 @@
 #ifdef _WIN32
 #include <windows.h>
 #else
-#define _GNU_SOURCE 1
 #include <sys/syscall.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ -153,13 +152,21 @@ static void utils_log_internal(utils_log_level_t level, int perror,
             }
             errno = saveno;
 #else
-            char err_buff[1024]; // max size according to manpage.
             int saveno = errno;
             errno = 0;
+#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE
+            char err[1024];
+            int err_ret = strerror_r(saveno, err, sizeof(err));
+            if (err_ret == ERANGE) {
+                postfix = "[truncated...]";
+            }
+#else
+            char err_buff[1024]; // max size according to manpage.
             const char *err = strerror_r(saveno, err_buff, sizeof(err_buff));
             if (errno == ERANGE) {
                 postfix = "[truncated...]";
             }
+#endif
             errno = saveno;
 #endif
             strncpy(b_pos, err, b_size);