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digitalmars.D.bugs - [Issue 8734] New: Compiler must verify exe path is writable before attempting compilation

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8734

           Summary: Compiler must verify exe path is writable before
                    attempting compilation
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: andrej.mitrovich gmail.com



18:30:07 PDT ---
Windows example:

test1.d:
module test;

import std.stdio;
import std.process;

void main()
{
    system("echo > test.exe");
    auto file = File("test.exe", "r");
    system("dmd test2.d -oftest.exe");
}

test2.d:
module test2;

import std.string;
string mixMe()
{
    string res;
    foreach (i; 0 .. 3_000)
        res ~= xformat("int i_%s;", i);
    return res;
}

mixin(mixMe());

void main()
{
}

$ rdmd test1.d
OPTLINK (R) for Win32  Release 8.00.12
Copyright (C) Digital Mars 1989-2010  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
OPTLINK : Error 3: Cannot Create File test.exe
--- errorlevel 1

test2.d demonstrates a module that takes a longer while to compile. test1.d
creates a phony test.exe, then opens it in read-mode to lock it. Then it
attempts to compile test2.d and write over test.exe.

DMD will first compile test2.d and only then attempt to write to test.exe and
fail. This can be a considerate waste of time, the compiler should check if the
output location is writable *before* attempting to compile.

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8734


Walter Bright <bugzilla digitalmars.com> changed:

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



19:21:24 PDT ---
I'm not seeing why this is an issue. Does this come up a lot for you?

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19:29:10 PDT ---


 I'm not seeing why this is an issue. Does this come up a lot for you?


It takes about half a minute to build one of my projects but I forgot to close
down the previously compiled application when doing so, so I've had to
recompile again.

This could be integrated into a build system, or even RDMD, but I thought it
would be nice to put the check directly into DMD.

If you believe the check would slow things down then I guess we can live
without the feature. It could be implemented as a simple system() call, e.g.
pseudocode:

if (system("echo > main.exe") == -1)  // error, couldn't overwrite file
{ }

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23:29:56 PDT ---
I think it would slow things down in general.

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prev sibling parent d-bugmail puremagic.com writes:
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Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX



08:54:30 PDT ---


 I think it would slow things down in general.


Ok I'm closing it. Anyway here's a win32 batch workaround:
 echo off
set "exePath=test.exe"
echo x > %exePath% || goto :ERROR

goto :EOF
:ERROR
echo Can't write to "%exePath%".

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