unexpected syntax error and crash

From: Tom Roberts <tjrob_at_fnal.gov>
Date: Tue, 22 Apr 2008 12:10:49 -0500

I am (finally) trying to understand why my big macro works in Root 5.12, 5.14, and 5.16, but crashes in Root 5.18. Along the way I found this problem with a static TString:

test1.C:
Generates a syntax error when loaded or executed.

test2.C:
Loads OK and begins execution, printing "TestIt created" followed by a crash. Also, loading it twice generates a crash (no execution, just two .L commands in a row).

test3.C:
Illustrates a workaround -- change xxx to be TString*. Loads multiple times and runs just fine.

Behavior is the same in Root 5.16 and Root 5.18, on Linux (Fedora Core 8). I installed both binary distributions of Root, using a symbolic link to quickly switch versions.

Tom Roberts

// test1.C
class TestIt {
public:

        static TString xxx;
public:

	TestIt() {
		printf("TestIt created\n");


	}

};
TString TestIt::xxx(".");

void test1() { new TestIt(); }

// test2.C
class TestIt {
public:

        static TString xxx;
public:

	TestIt() {
		printf("TestIt created\n");
		fflush(stdout);
		xxx = ".";
		printf("TestIt xxx='%s'\n",(const char *)xxx);
		fflush(stdout);


	}

};
TString TestIt::xxx();

void test2() { new TestIt(); }

// test3.C
class TestIt {
public:

        static TString *xxx;
public:

	TestIt() {
		printf("TestIt created\n");
		fflush(stdout);
		xxx = new TString(".");
		printf("TestIt xxx='%s'\n",(const char *)*xxx);
		fflush(stdout);


	}

};
TString *TestIt::xxx = 0;

void test3() { new TestIt(); } Received on Tue Apr 22 2008 - 19:22:01 CEST