Fix embedded (arm-none-eabi) builds

Due to OS#3360, build testing for arm-none-eabi was unfortunately
skipped for a long time.  This is a number of fixes that make the
compile test pass again.

Related: OS#3360
Change-Id: I88e3c8e1a8786ca2a6a023b0d27c74be200a8588

configure.ac

@@ -91,6 +91,8 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([char foo;])],
 CFLAGS="$saved_CFLAGS"
 AC_SUBST(SYMBOL_VISIBILITY)
 
+AC_CHECK_FUNCS(clock_gettime localtime_r)
+
 AC_DEFUN([CHECK_TM_INCLUDES_TM_GMTOFF], [
   AC_CACHE_CHECK(
     [whether struct tm has tm_gmtoff member],

src/logging.c

@@ -356,6 +356,7 @@ static void _output(struct log_target *target, unsigned int subsys,
 	}
 	if (!cont) {
 		if (target->print_ext_timestamp) {
+#ifdef HAVE_LOCALTIME_R
 			struct tm tm;
 			struct timeval tv;
 			osmo_gettimeofday(&tv, NULL);
@@ -367,6 +368,7 @@ static void _output(struct log_target *target, unsigned int subsys,
 			if (ret < 0)
 				goto err;
 			OSMO_SNPRINTF_RET(ret, rem, offset, len);
+#endif
 		} else if (target->print_timestamp) {
 			char *timestr;
 			time_t tm;

src/pseudotalloc/pseudotalloc.c

@@ -96,3 +96,19 @@ char *talloc_asprintf(const void *ctx, const char *fmt, ...)
 	va_end(args);
 	return buf;
 }
+
+void *talloc_steal(const void *new_ctx, const void *obj)
+{
+	/* as we don't do hierarchical allocations, this is simply a NOP */
+	return (void *)obj;
+}
+
+char *talloc_vasprintf(const void *t, const char *fmt, va_list ap)
+{
+	/* we have a hard-coded maximum string length of 128 bytes in this pseudo implementation */
+	char *buf = pseudotalloc_malloc(128);
+	if (!buf)
+		return NULL;
+	vsnprintf(buf, 128, fmt, ap);
+	return buf;
+}

src/pseudotalloc/talloc.h

@@ -59,3 +59,6 @@ void *_talloc_zero_array(const void *ctx,
 			 unsigned count,
 			 const char *name);
 char *talloc_asprintf(const void *ctx, const char *fmt, ...);
+
+void *talloc_steal(const void *new_ctx, const void *obj);
+char *talloc_vasprintf(const void *t, const char *fmt, va_list ap);

src/timer_clockgettime.c

@@ -44,6 +44,9 @@
 /*! \file timer_clockgettime.c
  */
 
+#include "config.h"
+#ifdef HAVE_CLOCK_GETTIME
+
 #include <stdlib.h>
 #include <stdbool.h>
 #include <sys/time.h>
@@ -135,4 +138,6 @@ void osmo_clock_override_add(clockid_t clk_id, time_t secs, long nsecs)
 		timespecadd(&c->time, &val, &c->time);
 }
 
+#endif /* HAVE_CLOCK_GETTIME */
+
 /*! @} */