http://d.puremagic.com/issues/show_bug.cgi?id=4854

           Summary: writefln Segmentation fault if no globals
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Mac OS X
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: alexibu@mac.com


--- Comment #0 from Alex Burton <alexibu@mac.com> 2010-09-11 14:29:49 PDT ---
Hi,

I have dmd version 2.048, OS X 10.5.8

If I compile this :

import std.stdio;
int main()
{
    writefln("%d",0);
    return 0;
}

with "dmd file.d"

and then run it

I get segmentation fault in writefln

if I then compile this :

import std.stdio;
int x;
int main()
{
    writefln("%d",0);
    return 0;
}

and run it, it works.

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wresch <wresch@drgang.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wresch@drgang.net


--- Comment #1 from wresch <wresch@drgang.net> 2010-10-15 16:51:44 PDT ---
I have the exact same issue.  In the code below the segfault happens in writefln.

Setup:
Digital Mars D Compiler v2.049
OS X 10.5.3
2.26 MHz Core2 duo (macbook pro)

[510]dmd2 >  cat hello.d
import std.stdio;
//int x;

void main() {
    writeln("hello world!");
    writefln("foo = %d", 10);
}
[511]dmd2 >  ./hello
Segmentation fault
[515]dmd2 >  cat hello2.d
import std.stdio;
int x;

void main() {
    writeln("hello world!");
    writefln("foo = %d", 10);
}
[
[514]dmd2 >  ./hello2
hello world!
foo = 10

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Kyle Kilpatrick <garfieldrules@sbcglobal.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |garfieldrules@sbcglobal.net


--- Comment #2 from Kyle Kilpatrick <garfieldrules@sbcglobal.net> 2010-10-15 17:04:55 PDT ---
I have the same problem.  In my OS X 10.5.8 installation, any program in my with a writef or writefln statement in DMD >= 2.047 segfaults.  Oddly, this problem is NOT present in DMD 2.046.  Readf in >= 2.047 also causes trouble.

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--- Comment #3 from Kyle Kilpatrick <garfieldrules@sbcglobal.net> 2010-10-15 17:08:27 PDT ---
My setup:

Digital Mars D 2.049
OS X 10.5.8
MacBook Black early 2008
Core 2 Duo 2.4ghz

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug@yahoo.com.au
            Summary|writefln Segmentation fault |Regression(2.047, Mac only)
                   |if no globals               |writefln Segmentation fault
                   |                            |if no globals
           Severity|major                       |regression


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--- Comment #4 from Don <clugdbug@yahoo.com.au> 2010-11-07 13:51:01 PST ---
Can somebody please help to track this down further?
Does it crash with: import std.stdio;  void main() { writeln("abc", 0);}   ?
Does it crash with: import std.string; void main() { format("%d", 0); } ?
Does it crash with: import std.string; void main() { writefln("abc"); } ?

If it crashes with writeln, it's probably a compiler code generation bug, related to varargs.

And can you get a stack trace?

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--- Comment #5 from Alex Burton <alexibu@mac.com> 2010-11-08 01:51:46 PST ---
(In reply to comment #4)
> Can somebody please help to track this down further?
> Does it crash with: import std.stdio;  void main() { writeln("abc", 0);}   ?
YES
> Does it crash with: import std.string; void main() { format("%d", 0); } ?
NO
> Does it crash with: import std.string; void main() { writefln("abc"); } ?
assume you meant import std.stdio: YES
> 
> If it crashes with writeln, it's probably a compiler code generation bug, related to varargs.
> 
> And can you get a stack trace?

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: 13 at address: 0x00000000
0x0000a7b9 in __tls_get_addr ()
(gdb) bt
#0  0x0000a7b9 in __tls_get_addr ()
#1  0x000073a1 in _moduleTlsCtor ()
#2  0x0000fbfd in D2rt6dmain24mainUiPPaZi6runAllMFZv ()
#3  0x0000fb06 in D2rt6dmain24mainUiPPaZi7tryExecMFMDFZvZv ()
#4  0x0000fa93 in main ()

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com


--- Comment #6 from Walter Bright <bugzilla@digitalmars.com> 2010-11-08 09:59:18 PST ---
I cannot reproduce this problem with OS X 10.6.

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Jacob Carlborg <doob@me.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |doob@me.com


--- Comment #7 from Jacob Carlborg <doob@me.com> 2010-11-08 12:34:49 PST ---
I can reproduce it on Mac OS X 10.5.8 using dmd 2.050.

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--- Comment #8 from Walter Bright <bugzilla@digitalmars.com> 2010-11-08 14:11:18 PST ---
I've had a lot of problems with the 10.5 linker screwing up on empty sections. I suspect the solution is for, a module that defines main(), to output 4 bytes of dummy data into the tls section if it is blank.

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