[libgfortran, patch] More than 26 temporary files with weak mktemp()

[Jerry DeLisle]

On 03/12/2011 07:21 AM, FX wrote:
> The attached patch fixes half of PR 47439. On platform with weak or historical implementations of mktemp(), this function cannot generate more than 26 unique filenames for a given base. This happens in particular on Windows, and limits us to 26 scratch files open simultaneously.
>
> The patch works around that by adding an almost unique prefix to the filename string, which has a period of 17576. Thus, the new implementation allows to generate 456976 unique filenames, which I deemed enough :)
>
> As the issue is not a regression, I don't think it's 4.6 material so, if approved, I will commit when 4.7 branches unless instructed to do otherwise. I'd also like feedback on the attached test: do we expect systems to fail because of limits not allowing them to open 30 files?
>
> Manually tested on i586-pc-mingw32, regtested on x86_64-linux by editing config.h to fake the absence of mkstemp().
> OK for 4.7?
>
Yes, OK for 4.7

Jerry