Add libmissing

This patch adds a libmissing library to mtd-utils, containing
implementations of functionality found in glibc but typically
missing from embedded C libraries such as uclibc ot musl.

For now, the library only contains stub implementations of
the backtrace*() family of functions.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/execinfo.c b/lib/execinfo.c
new file mode 100644
index 0000000..a39df83
--- /dev/null
+++ b/lib/execinfo.c
@@ -0,0 +1,25 @@
+#include "libmissing.h"
+
+#ifndef HAVE_EXECINFO
+#define PROGRAM_NAME "libmissing"
+#include "common.h"
+
+int backtrace(void **buffer, int size)
+{
+	void *addr = __builtin_return_address(0);
+
+	errmsg("backtrace() is not implemented. Called from %p", addr);
+	return 0;
+}
+
+char **backtrace_symbols(void *const *buffer, int size)
+{
+	errmsg("backtrace_symbols() is not implemented");
+	return NULL;
+}
+
+void backtrace_symbols_fd(void *const *buffer, int size, int fd)
+{
+	errmsg("backtrace_symbols_fd() is not implemented");
+}
+#endif /* !HAVE_EXECINFO */