ucs: portability fixes for non-glibc / Clang environments

config/m4/sysdep.m4

@@ -296,6 +296,12 @@ AC_CHECK_HEADERS([malloc_np.h])
 AC_CHECK_HEADERS([endian.h, sys/endian.h])
 
 
+#
+# IEEE 754 floating-point helpers (glibc extension, absent on musl/FreeBSD)
+#
+AC_CHECK_HEADERS([ieee754.h])
+
+
 #
 # Linux-only headers
 #

src/ucs/arch/aarch64/cpu.h

@@ -16,6 +16,7 @@
 #include <string.h>
 #include <sys/times.h>
 #include <ucs/sys/compiler_def.h>
+#include <ucs/sys/ptr_arith.h>
 #include <ucs/arch/generic/cpu.h>
 #include <ucs/sys/math.h>
 #include <ucs/type/status.h>

src/ucs/debug/debug.c

@@ -24,6 +24,8 @@
 #include <dlfcn.h>
 #include <link.h>
 #include <dirent.h>
+#include <signal.h>
+#include <stdlib.h>
 #ifdef HAVE_DETAILED_BACKTRACE
 #  include <bfd.h>
 #endif /* HAVE_DETAILED_BACKTRACE */

src/ucs/debug/log.c

@@ -78,7 +78,7 @@ const char *ucs_log_level_names[] = {
 static unsigned ucs_log_handlers_count       = 0;
 static int ucs_log_initialized               = 0;
 static int __thread ucs_log_current_indent   = 0;
-static char ucs_log_hostname[HOST_NAME_MAX]  = {0};
+static char ucs_log_hostname[UCS_HOST_NAME_MAX + 1] = {0};
 static int ucs_log_pid                       = 0;
 static FILE *ucs_log_file                    = NULL;
 static char *ucs_log_file_base_name          = NULL;

src/ucs/memory/numa.c

@@ -114,7 +114,7 @@ unsigned ucs_numa_num_configured_cpus()
 
     if (num_cpus == 0) {
         max_cpu  = ucs_numa_get_max_dirent(UCS_SYS_FS_CPUS_PATH, "cpu",
-                                           __CPU_SETSIZE, 0);
+                                           UCS_CPU_SETSIZE, 0);
         num_cpus = max_cpu + 1;
     }
 
@@ -124,12 +124,13 @@ unsigned ucs_numa_num_configured_cpus()
 ucs_numa_node_t ucs_numa_node_of_cpu(int cpu)
 {
     /* Used for caching to improve performance */
-    static ucs_numa_node_t cpu_numa_node[__CPU_SETSIZE] = {0};
+    static ucs_numa_node_t cpu_numa_node[UCS_CPU_SETSIZE] = {0};
     char *core_dir_path;
     ucs_numa_node_t node;
     ucs_status_t status;
 
-    ucs_assert(cpu < __CPU_SETSIZE);
+    UCS_STATIC_ASSERT(UCS_CPU_SETSIZE >= __CPU_SETSIZE);
+    ucs_assert(cpu < UCS_CPU_SETSIZE);
 
     if (cpu_numa_node[cpu] == 0) {
         status = ucs_string_alloc_formatted_path(&core_dir_path,

src/ucs/sys/compiler.h

@@ -46,7 +46,6 @@
 #define UCS_F_NOOPTIMIZE
 #endif
 
-
 /**
  * Copy words from _src to _dst.
  *

src/ucs/sys/sys.h

@@ -50,6 +50,8 @@
 #include <net/if.h>
 #include <netdb.h>
 #include <dirent.h>
+#include <limits.h>
+#include <unistd.h>
 
 
 #include <sys/types.h>
@@ -63,6 +65,16 @@ typedef cpuset_t ucs_sys_cpuset_t;
 #error "Port me"
 #endif
 
+#ifdef HOST_NAME_MAX
+#define UCS_HOST_NAME_MAX HOST_NAME_MAX
+#else
+#ifdef _POSIX_HOST_NAME_MAX
+#define UCS_HOST_NAME_MAX _POSIX_HOST_NAME_MAX
+#else
+#define UCS_HOST_NAME_MAX 256
+#endif
+#endif
+
 #define UCS_SYS_FS_SYSTEM_PATH "/sys/devices/system"
 #define UCS_SYS_FS_CPUS_PATH   UCS_SYS_FS_SYSTEM_PATH "/cpu"
 

src/ucs/type/float8.h

@@ -7,7 +7,28 @@
 #ifndef UCS_TYPE_FLOAT_H
 #define UCS_TYPE_FLOAT_H
 
+#ifdef HAVE_IEEE754_H
 #include <ieee754.h>
+#else
+/* Portable fallback for systems without <ieee754.h> (non-glibc, e.g. musl, FreeBSD libc) */
+union ieee754_double {
+    double d;
+    struct {
+#if defined(FLOAT_WORDS_BIGENDIAN)
+        unsigned int negative:1;
+        unsigned int exponent:11;
+        unsigned int mantissa0:20;
+        unsigned int mantissa1:32;
+#else
+        unsigned int mantissa1:32;
+        unsigned int mantissa0:20;
+        unsigned int exponent:11;
+        unsigned int negative:1;
+#endif
+    } ieee;
+};
+#define IEEE754_DOUBLE_BIAS 0x3ff
+#endif
 
 #include <ucs/sys/preprocessor.h>
 #include <ucs/debug/assert.h>