port: don't use the existing log system in crashlog in case it crashes

port/include/system.h

@@ -24,7 +24,7 @@ u64 sysGetMicroseconds(void);
 
 void sysFatalError(const char *fmt, ...) __attribute__((noreturn));
 
-void sysLogStartCrash(void);
+s32 sysLogIsOpen(void);
 void sysLogPrintf(s32 level, const char *fmt, ...);
 
 void sysGetExecutablePath(char *outPath, const u32 outLen);

port/src/crash.c

@@ -10,6 +10,7 @@
 #include "system.h"
 #include "platform.h"
 
+#define CRASH_LOG_FNAME "pd.crash.log"
 #define CRASH_MAX_MSG 8192
 #define CRASH_MAX_SYM 256
 #define CRASH_MAX_FRAMES 32
@@ -132,9 +133,6 @@ static long __stdcall crashHandler(PEXCEPTION_POINTERS exinfo)
 		return EXCEPTION_CONTINUE_EXECUTION;
 	}
 
-	// start writing to a crash log file
-	sysLogStartCrash();
-
 	sysLogPrintf(LOG_ERROR, "FATAL: Crashed: PC=%p CODE=0x%08lx", exinfo->ExceptionRecord->ExceptionAddress, exinfo->ExceptionRecord->ExceptionCode);
 
 	fflush(stderr);
@@ -142,6 +140,15 @@ static long __stdcall crashHandler(PEXCEPTION_POINTERS exinfo)
 
 	crashStackTrace(msg, exinfo);
 
+	// open log file for the crash dump if one hasn't been opened yet
+	if (!sysLogIsOpen()) {
+		FILE *f = fopen(CRASH_LOG_FNAME, "wb");
+		if (f) {
+			fprintf(f, "Crash!\n\n%s", msg);
+			fclose(f);
+		}
+	}
+
 	sysFatalError("Crash!\n\n%s", msg);
 
 	return EXCEPTION_CONTINUE_EXECUTION;

port/src/system.c

@@ -103,11 +103,9 @@ u64 sysGetMicroseconds(void)
 	return ((u64)tv.tv_sec * USEC_IN_SEC + (u64)tv.tv_usec) - startTick;
 }
 
-void sysLogStartCrash(void)
+s32 sysLogIsOpen(void)
 {
-	if (!logPath[0]) {
-		sysLogSetPath(CRASHLOG_FNAME);
-	}
+	return (logPath[0] != '\0');
 }
 
 void sysLogPrintf(s32 level, const char *fmt, ...)