Commit94478aa

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Detect out of date flex in MSVC builds.

Per recent discussion, following a report from Quan Zongliang.The same logic is used as in pgbison.pl.

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Lines changed: 7 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -12,10 +12,14 @@`
`12`	`12`
`13`	`13`	`require'src/tools/msvc/buildenv.pl'if-e'src/tools/msvc/buildenv.pl';`
`14`	`14`
`15`		`-system('flex -V > NUL');`
`16`		`-if ($? != 0)`
	`15`	+my ($flexver) =`flex -V`;# grab first line
	`16`	`+$flexver=(split(/\s+/,$flexver))[1];`
	`17`	`+$flexver =~s/[^0-9.]//g;`
	`18`	`+my@verparts =split(/\./,$flexver);`
	`19`	`+unless ($verparts[0] == 2 &&$verparts[1] == 5 &&$verparts[2] >= 31)`
`17`	`20`	`{`
`18`		`-print"WARNING! flex install not found, attempting to build without\n";`
	`21`	`+print"WARNING! Flex install not found, or unsupported Flex version.\n";`
	`22`	`+print"echo Attempting to build without.\n";`
`19`	`23`	`exit 0;`
`20`	`24`	`}`
`21`	`25`

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