WIP: try to use regular libbacktrace API

Signed-off-by: Johannes Schindelin <[email protected]>

Makefile

@@ -1621,8 +1621,8 @@ ifdef OPEN_RETURNS_EINTR
 endif
 ifneq (,$(DEBUG_FILE_LOCKS))
 	BACKTRACE_SOURCES := $(patsubst %,compat/libbacktrace/%,atomic.c \
-		alloc.c dwarf.c state.c fileline.c posix.c pecoff.c sort.c \
-		read.c)
+		alloc.c backtrace.c dwarf.c state.c fileline.c posix.c \
+		pecoff.c sort.c read.c)
 	BACKTRACE_OBJS := $(patsubst %.c,%.o,$(BACKTRACE_SOURCES))
 	COMPAT_OBJS += $(BACKTRACE_OBJS)
 $(BACKTRACE_OBJS): EXTRA_CPPFLAGS = -I compat/libbacktrace

compat/libbacktrace/backtrace.c

@@ -108,8 +108,8 @@ static int win32_unwind(struct backtrace_data *bdata)
     HMODULE kernel32 =
       LoadLibraryExW(L"kernel32.dll", NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
     if (kernel32)
-      RtlCaptureStackBackTrace =
-        (void *)GetProcAddress(kernel32, "RtlCaptureStackBackTrace");
+      RtlCaptureStackBackTrace = (USHORT (*)(ULONG, ULONG, PVOID*, PULONG))
+        (void (*)(void))GetProcAddress(kernel32, "RtlCaptureStackBackTrace");
     initialized = 1;
     if (!RtlCaptureStackBackTrace)
       return -1;

compat/mingw.c

@@ -3624,6 +3624,31 @@ static int is_system32_path(const char *path)
 	return 1;
 }
 
+#include "libbacktrace/backtrace.h"
+#include "libbacktrace/backtrace-supported.h"
+
+static void bt_error_callback(void *data, const char *msg, int errnum)
+{
+      error("%s (%d)", msg, errnum);
+}
+
+static struct backtrace_state *bt_state;
+
+static int bt_full_callback(void *data, uintptr_t pc, const char *filename, int lineno, const char *function)
+{
+      fprintf(stderr, "%s:%d %s %p\n", filename, lineno, function, (void *)pc);
+
+      return 0;
+}
+
+static void printStacktraceWithLines(void)
+{
+      if (!bt_state)
+              bt_state = backtrace_create_state(NULL, BACKTRACE_SUPPORTS_THREADS, bt_error_callback, NULL);
+      backtrace_full(bt_state, 1, bt_full_callback, bt_error_callback, NULL);
+}
+
+
 static void setup_windows_environment(void)
 {
 	char *tmp = getenv("TMPDIR");
@@ -3638,6 +3663,7 @@ static void setup_windows_environment(void)
 		}
 	}
 
+printStacktraceWithLines();
 	if (tmp) {
 		/*
 		 * Convert all dir separators to forward slashes,