R crash using Sys.which on Windows

Some clarifications and additional data on this bug:

- this has nothing to do with Rtools as such, but applies to finding
  any executable with 'Sys.which' that happens to live in a path with
  more than 96 characters;

- the issue also occurs when using the 32-bit version of RGui
  on Windows 7 64-bit (and also with R.exe at the command line);

- the issue also occurs when using the 32-bit version of RGui
  on Windows 7 32-bit (and also with R.exe at the command line).

By means of example, the 'problem details' as given by Windows
when R crashes is pasted below:

Problem signature:
  Problem Event Name:	APPCRASH
  Application Name:	Rterm.exe
  Application Version:	3.10.65387.0
  Application Timestamp:	5347f09a
  Fault Module Name:	ntdll.dll
  Fault Module Version:	6.1.7601.17514
  Fault Module Timestamp:	4ce7b96e
  Exception Code:	c0000005
  Exception Offset:	000558d4
  OS Version:	6.1.7601.2.1.0.256.48
  Locale ID:	1033
  Additional Information 1:	0a9e
  Additional Information 2:	0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:	0a9e
  Additional Information 4:	0a9e372d3b4ad19135b953a78882e789

Best,
Tobias

----- Original Message -----

From: "Tobias Verbeke" <tobias.verbeke at openanalytics.eu>
To: r-devel at r-project.org
Sent: Tuesday, May 6, 2014 8:28:54 PM
Subject: [Rd] R crash using Sys.which on Windows

Dear list,

When installing the latest version of Rtools (3.1.0.1942) into a path that
contains more than 96 characters on Windows 7 64-bit,
e.g. into

C:\TheLatestRtoolsInAPathWithMoreThanNinetySixCharactersWillCrashTheRSessionUponCallingTheSysWhichFunctionInRToGetTheGccPath

and assuming that the Rtools bin paths have been appropriately added to the
PATH environment variable as in

c:\TheLatestRtoolsInAPathWithMoreThanNinetySixCharactersWillCrashTheRSessionUponCallingTheSysWhichFunctionInRToGetTheGccPath\bin;c:\TheLatestRtoolsInAPathWithMoreThanNinetySixCharactersWillCrashTheRSessionUponCallingTheSysWhichFunctionInRToGetTheGccPath\gcc-4.6.3\bin

the following call from RGui 64-bit (version 3.1.0) reproducibly causes R to
crash:

Sys.which("ls")

Sys.which seems to use an internal function on Windows. Is this a known
issue?

Please let me know if I can provide any more relevant information.

Best,
Tobias

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