Internal thread:

From: Mike Lai
Sent: Monday, May 23, 2016 3:44 PM
To: Kevin Ransom Kevin.Ransom@microsoft.com
Cc: Michael Fanning (DEVDIV) Michael.Fanning@microsoft.com; Tomas Matousek Tomas.Matousek@microsoft.com
Subject: RE: F# Compiler (fsc.exe)

I see, Kevin. Would you mind to consider our request to make SHA256 as one of available sections, please?

All the following compilers support SHA256 today.

Thanks
Mike

• cl.exe /ZH:SHA_256
• ml.exe /ZH:SHA_256
• ml64.exe /ZH:SHA_256
• armasm.exe -gh:SHA_256
• armasm64.exe -gh:SHA_256
• csc.exe /checksumalgorithm:SHA256

From: Kevin Ransom
Sent: Monday, May 23, 2016 3:40 PM
To: Mike Lai mikelai@microsoft.com
Cc: Michael Fanning (DEVDIV) Michael.Fanning@microsoft.com; Tomas Matousek Tomas.Matousek@microsoft.com
Subject: Re: F# Compiler (fsc.exe)

Not selectable and MD5

https://github.com/Microsoft/visualfsharp/blob/master/src/absil/ilwritepdb.fs#L126

Kevin
From: Mike Lai mikelai@microsoft.com
Date: Monday, May 23, 2016 at 3:30 PM
To: Kevin Ransom Kevin.Ransom@microsoft.com
Cc: "Michael Fanning (DEVDIV)" Michael.Fanning@microsoft.com, Tomas Matousek Tomas.Matousek@microsoft.com
Subject: RE: F# Compiler (fsc.exe)

Hi Kevin -- It is about the hashes of compiled source files being written by the compiler to the pdb files?

What kind (SHA1 or SHA256) of hashes does the F# Compiler (fsc.exe) put in the pdb files ?

CSC.exe can put either based on the “/checksumalgorithm:” switch. I am wondering if fsc.exe can support the same please?

Thanks

Mike

From: Kevin Ransom
Sent: Monday, May 23, 2016 3:26 PM
To: Mike Lai mikelai@microsoft.com
Cc: Michael Fanning (DEVDIV) Michael.Fanning@microsoft.com; Tomas Matousek Tomas.Matousek@microsoft.com
Subject: Re: F# Compiler (fsc.exe)

Hey Mike,

Can you let me know what this is about?

Thanks

Kevin

From: Mike Lai mikelai@microsoft.com
Date: Monday, May 23, 2016 at 2:10 PM
To: Kevin Ransom Kevin.Ransom@microsoft.com
Cc: "Michael Fanning (DEVDIV)" Michael.Fanning@microsoft.com, Tomas Matousek Tomas.Matousek@microsoft.com
Subject: RE: F# Compiler (fsc.exe)

Thanks Tomas for the introduction! Hi Kevin – please find enclosed the background information on why we are driving this. Please feel free to let me know if you have additional questions.

Thanks
Mike

From: Tomas Matousek
Sent: Monday, May 23, 2016 1:56 PM
To: Kevin Ransom Kevin.Ransom@microsoft.com
Cc: Michael Fanning (DEVDIV) Michael.Fanning@microsoft.com; Mike Lai mikelai@microsoft.com
Subject: RE: F# Compiler (fsc.exe)

Kevin, F# needs “/checksumalgorithm:” command line switch to set the algorithm to calculate document hash saved to PDB.
Mike is driving the effort to get the option to all compilers.

Thanks,
Tomas