Repeated rebuilding of compiler

[vasily-kirichenko]

1. Select a test in Test Explorer
2. Run it
3. FSharp.Compiler.Private builds
4. Change no code, rerun the test
5. FSharp.Compiler.Private builds again

Investigating the cause with this registry flag https://blogs.msdn.microsoft.com/kirillosenkov/2014/08/04/how-to-investigate-rebuilding-in-visual-studio-when-nothing-has-changed/ I get the following output:

2>Checking whether FSharp.Compiler.Private needs to be rebuilt:
2>   Output: 15-Sep-17 16:00:20 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\OBJ\NET40\FSHARP.COMPILER.PRIVATE.DLL
2>   Output: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\MICROSOFT.BUILD.FRAMEWORK.DLL
2>   Output: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\MICROSOFT.BUILD.DLL
2>   Output: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\MICROSOFT.BUILD.CONVERSION.CORE.DLL
2>   Output: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\MICROSOFT.BUILD.ENGINE.DLL
2>   Output: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\MICROSOFT.BUILD.UTILITIES.CORE.DLL
2>   Output: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\MICROSOFT.BUILD.TASKS.CORE.DLL
2>   Output: 13-Jun-16 05:30:36 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\MICROSOFT.DIASYMREADER.PORTABLEPDB.DLL
2>   Output: 19-Jan-17 16:23:52 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\MICROSOFT.DIASYMREADER.DLL
2>   Output: 19-Dec-16 12:20:32 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\SYSTEM.REFLECTION.METADATA.DLL
2>   Output: 11-Jun-16 23:13:16 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\SYSTEM.COLLECTIONS.IMMUTABLE.DLL
2>   Output: 19-Apr-17 16:58:52 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\SYSTEM.VALUETUPLE.DLL
2>   Output: 15-Sep-17 15:59:47 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\FSHARP.COMPILER.PRIVATE.XML
2>   Output: 15-Sep-17 16:00:20 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\OBJ\NET40\FSHARP.COMPILER.PRIVATE.PDB
2>   Output: 15-Sep-17 16:00:20 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\FSHARP.COMPILER.PRIVATE.DLL
2>   Output: 15-Sep-17 16:00:20 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\FSHARP.COMPILER.PRIVATE.PDB
2>   Input: 15-Sep-17 11:26:57 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\FSHARP.COMPILER.PRIVATE.FSPROJ
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ASSEMBLYINFO\ASSEMBLYINFO.FSHARP.COMPILER.PRIVATE.DLL.FS
2>   Input: 04-Sep-17 15:49:52 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\RESHAPEDREFLECTION.FS
2>   Input: 04-Sep-17 15:49:52 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\RESHAPEDMSBUILD.FS
2>   Input: 15-Sep-17 11:26:48 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\SFORMAT.FSI
2>   Input: 15-Sep-17 11:26:48 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\SFORMAT.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SR.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SR.FS
2>   Input: 04-Sep-17 15:49:52 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\PRIM-LEXING.FSI
2>   Input: 04-Sep-17 15:49:52 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\PRIM-LEXING.FS
2>   Input: 04-Sep-17 15:49:52 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\PRIM-PARSING.FSI
2>   Input: 04-Sep-17 15:49:52 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\PRIM-PARSING.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\RESIZEARRAY.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\RESIZEARRAY.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\HASHMULTIMAP.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\HASHMULTIMAP.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\EDITDISTANCE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\TAGGEDCOLLECTIONS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\TAGGEDCOLLECTIONS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILDIAG.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILDIAG.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILLIB.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\FILENAME.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\FILENAME.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ZMAP.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ZMAP.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ZSET.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ZSET.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\BYTES.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\BYTES.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\INTERNALCOLLECTIONS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\INTERNALCOLLECTIONS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\QUEUELIST.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\LIB.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\RATIONAL.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\RATIONAL.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\RANGE.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\RANGE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\ERRORLOGGER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\ERRORRESOLUTIONHINTS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\REFERENCERESOLVER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\IL.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\IL.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILX.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILX.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILASCII.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILASCII.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILPRINT.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILPRINT.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILMORPH.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILMORPH.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILSUPP.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILSUPP.FS
2>   Input: 15-Sep-17 12:39:08 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\ILPARS.FS
2>   Input: 15-Sep-17 12:39:06 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\ILLEX.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILBINARY.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILBINARY.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILREAD.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILREAD.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILWRITE.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILWRITEPDB.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILWRITEPDB.FS
2>   Input: 15-Sep-17 11:26:48 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILWRITE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ABSIL\ILREFLECT.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\UTILS\COMPILERLOCATIONUTILS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\PRETTYNAMING.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ILX\ILXSETTINGS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ILX\ERASECLOSURES.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ILX\ERASECLOSURES.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ILX\ERASEUNIONS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\ILX\ERASEUNIONS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\UNICODELEXING.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\UNICODELEXING.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\LAYOUT.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\LAYOUT.FS
2>   Input: 15-Sep-17 11:26:48 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\AST.FS
2>   Input: 15-Sep-17 12:39:08 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\PPPARS.FS
2>   Input: 15-Sep-17 12:39:26 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\PARS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\LEXHELP.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\LEXHELP.FS
2>   Input: 15-Sep-17 12:39:06 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\PPLEX.FS
2>   Input: 15-Sep-17 12:39:07 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\LEX.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\LEXFILTER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TAINTED.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TAINTED.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\EXTENSIONTYPING.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\EXTENSIONTYPING.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\QUOTATIONPICKLER.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\QUOTATIONPICKLER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TAST.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TCGLOBALS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TASTOPS.FSI
2>   Input: 15-Sep-17 11:26:48 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TASTOPS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TASTPICKLE.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TASTPICKLE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\IMPORT.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\IMPORT.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\INFOS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\ACCESSIBILITYLOGIC.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\ATTRIBUTECHECKING.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\INFOREADER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\NICEPRINT.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\AUGMENTWITHHASHCOMPARE.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\AUGMENTWITHHASHCOMPARE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\NAMERESOLUTION.FSI
2>   Input: 15-Sep-17 11:26:48 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\NAMERESOLUTION.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TYPERELATIONS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SIGNATURECONFORMANCE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\METHODOVERRIDES.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\METHODCALLS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\PATTERNMATCHCOMPILATION.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\PATTERNMATCHCOMPILATION.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\CONSTRAINTSOLVER.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\CONSTRAINTSOLVER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\CHECKFORMATSTRINGS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\CHECKFORMATSTRINGS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FINDUNSOLVED.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\QUOTATIONTRANSLATOR.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\QUOTATIONTRANSLATOR.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\POSTINFERENCECHECKS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\POSTINFERENCECHECKS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TYPECHECKER.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\TYPECHECKER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\OPTIMIZER.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\OPTIMIZER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\DETUPLEARGS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\DETUPLEARGS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\INNERLAMBDASTOTOPLEVELFUNCS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\INNERLAMBDASTOTOPLEVELFUNCS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\LOWERCALLSANDSEQS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\AUTOBOX.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\ILXGEN.FSI
2>   Input: 15-Sep-17 11:26:48 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\ILXGEN.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\COMPILEOPS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\COMPILEOPS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\COMPILEOPTIONS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\COMPILEOPTIONS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSC.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSC.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SYMBOLS\SYMBOLHELPERS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SYMBOLS\SYMBOLHELPERS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SYMBOLS\SYMBOLS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SYMBOLS\SYMBOLS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SYMBOLS\EXPRS.FSI
2>   Input: 15-Sep-17 11:26:48 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SYMBOLS\EXPRS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\INCREMENTALBUILD.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\INCREMENTALBUILD.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\REACTOR.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\REACTOR.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICECONSTANTS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEDECLARATIONLISTS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEDECLARATIONLISTS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICELEXING.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICELEXING.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEPARSETREEWALK.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICENAVIGATION.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICENAVIGATION.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEPARAMINFOLOCATIONS.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEPARAMINFOLOCATIONS.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEUNTYPEDPARSE.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEUNTYPEDPARSE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEASSEMBLYCONTENT.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEASSEMBLYCONTENT.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEXMLDOCPARSER.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEXMLDOCPARSER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\SIMULATEDMSBUILDREFERENCERESOLVER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\EXTERNALSYMBOL.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\EXTERNALSYMBOL.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICE.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEINTERFACESTUBGENERATOR.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICEINTERFACESTUBGENERATOR.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICESTRUCTURE.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\VS\SERVICESTRUCTURE.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSI\FSI.FSI
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSI\FSI.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSHARP.COMPILER.PRIVATE\INTERNALSVISIBLETO.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\MSBUILDREFERENCERESOLVER.FS
2>   Input: 04-Sep-17 15:49:51 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\LEGACYHOSTEDCOMPILERFORTESTING.FS
2>   Input: 21-Jun-17 11:36:13 D:\WLCR\GITHUB\VISUALFSHARP\SRC\FSHARP\FSSTRINGS.RESX
2>   Input: 15-Sep-17 12:38:57 D:\WLCR\GITHUB\VISUALFSHARP\DEBUG\NET40\BIN\FSHARP.CORE.DLL
2>   Input: 26-Sep-12 04:16:08 C:\PROGRAM FILES (X86)\REFERENCE ASSEMBLIES\MICROSOFT\FRAMEWORK\.NETFRAMEWORK\V4.5\ISYMWRAPPER.DLL
2>   Input: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\MICROSOFT.VISUALFSHARP.MSBUILD.15.0.1.0.1\LIB\NET45\MICROSOFT.BUILD.DLL
2>   Input: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\MICROSOFT.VISUALFSHARP.MSBUILD.15.0.1.0.1\LIB\NET45\MICROSOFT.BUILD.FRAMEWORK.DLL
2>   Input: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\MICROSOFT.VISUALFSHARP.MSBUILD.15.0.1.0.1\LIB\NET45\MICROSOFT.BUILD.TASKS.CORE.DLL
2>   Input: 03-Aug-16 14:18:52 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\MICROSOFT.VISUALFSHARP.MSBUILD.15.0.1.0.1\LIB\NET45\MICROSOFT.BUILD.UTILITIES.CORE.DLL
2>   Input: 19-Jan-17 16:23:52 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\MICROSOFT.DIASYMREADER.1.1.0\LIB\PORTABLE-NET45+WIN8\MICROSOFT.DIASYMREADER.DLL
2>   Input: 13-Jun-16 05:30:36 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\MICROSOFT.DIASYMREADER.PORTABLEPDB.1.1.0\LIB\PORTABLE-NET45+WIN8\MICROSOFT.DIASYMREADER.PORTABLEPDB.DLL
2>   Input: 26-Sep-12 04:16:08 C:\PROGRAM FILES (X86)\REFERENCE ASSEMBLIES\MICROSOFT\FRAMEWORK\.NETFRAMEWORK\V4.5\MSCORLIB.DLL
2>   Input: 26-Sep-12 04:16:08 C:\PROGRAM FILES (X86)\REFERENCE ASSEMBLIES\MICROSOFT\FRAMEWORK\.NETFRAMEWORK\V4.5\SYSTEM.DLL
2>   Input: 11-Jun-16 23:13:16 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\SYSTEM.COLLECTIONS.IMMUTABLE.1.2.0\LIB\PORTABLE-NET45+WIN8+WP8+WPA81\SYSTEM.COLLECTIONS.IMMUTABLE.DLL
2>   Input: 26-Sep-12 04:16:08 C:\PROGRAM FILES (X86)\REFERENCE ASSEMBLIES\MICROSOFT\FRAMEWORK\.NETFRAMEWORK\V4.5\SYSTEM.CORE.DLL
2>   Input: 26-Sep-12 04:16:08 C:\PROGRAM FILES (X86)\REFERENCE ASSEMBLIES\MICROSOFT\FRAMEWORK\.NETFRAMEWORK\V4.5\SYSTEM.NUMERICS.DLL
2>   Input: 19-Dec-16 12:20:32 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\SYSTEM.REFLECTION.METADATA.1.4.2\LIB\PORTABLE-NET45+WIN8\SYSTEM.REFLECTION.METADATA.DLL
2>   Input: 19-Apr-17 16:58:52 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\SYSTEM.VALUETUPLE.4.3.1\LIB\NETSTANDARD1.0\SYSTEM.VALUETUPLE.DLL
2>Freshest input: 15-Sep-17 12:39:26
2>Stalest output: 11-Jun-16 23:13:16

The stalest output corresponds to a single assembly:

Input: 11-Jun-16 23:13:16 D:\WLCR\GITHUB\VISUALFSHARP\PACKAGES\SYSTEM.COLLECTIONS.IMMUTABLE.1.2.0\LIB\PORTABLE-NET45+WIN8+WP8+WPA81\SYSTEM.COLLECTIONS.IMMUTABLE.DLL

Any ideas what to do with it?

[vasily-kirichenko]

build test-net40-fsharpqa include xxx causes rebuilding as well each time a QA test is run, which takes a minute and I consider it a terrible experience.

[dsyme]

@vasily-kirichenko AFAIK this is a recent regression in incremental building of some kind

[dsyme]

Looking at master now, the repeated rebuilding when using .\build net40 seems to come from this:

Input file "obj\net40\FSBuild.fs" is newer than output file "C:\GitHub\dsyme\visualfsharp\src\fsharp\FSharp.Build\..\..\..\\net40\bin\FSharp.Build.xml".

which comes from this

Using "FSharpEmbedResourceText" task from assembly "C:\GitHub\dsyme\visualfsharp\Proto\net40\bin\FSharp.Build-proto.dll".
Task "FSharpEmbedResourceText"
FSharpEmbedResourceText: Reading FSBuild.txt
FSharpEmbedResourceText: Parsing FSBuild.txt
FSharpEmbedResourceText: Validating FSBuild.txt
FSharpEmbedResourceText: Validating uniqueness of FSBuild.txt
FSharpEmbedResourceText: Generating obj\net40\FSBuild.fs
FSharpEmbedResourceText: Generating resource methods for obj\net40\FSBuild.fs
FSharpEmbedResourceText: Generating .resx for obj\net40\FSBuild.fs
FSharpEmbedResourceText: Done obj\net40\FSBuild.fs
Done executing task "FSharpEmbedResourceText".
Done building target "GenerateFSharpTextResources" in project "FSharp.Build.fsproj".

[dsyme]

This will be related to #3577 // cc @brettfo