Check for supported version of D compiler

[norbusan]

check against minimal needed version of ldc/dmd compilers
only the first three numbers are compared as numbers, everything after
that is string compared

The check can be disabled with --disable-version-check

[abraunegg]

@norbusan
So the x32 build is failing due to this:

checking for a BSD-compatible install... /usr/bin/install -c
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for dmd... /home/travis/build/abraunegg/onedrive/dlang-x32/linux/bin32/dmd
checking version of D compiler... 2.081.1
./configure: line 412: test: current: integer expression expected
configure: error: compiler
./configure: line 301: return: current: numeric argument required
./configure: line 311: exit: current: numeric argument required
The command "bash -ex .travis-ci.sh" exited with 2.

Updating the Travis CI script to 2.083.1

[abraunegg]

@norbusan
OK - the update to the Travis CI script did the trick - tho - if the version is 'old' will it 'barf' as per the output above or fail with a better error ... will have to do some testing locally

[norbusan]

Strange ... very strange. I need to try to trick some old version ... please wait.

[norbusan]

Fixed ... forgot the [ ] around the error message. Now it does:

$ ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for dmd... dmd
checking version of D compiler... 2.081.1
configure: error: Compiler version insufficient, current compiler version 2.081.1, minimum version 2.083.1
$

[norbusan]

Please adjust wording if necessary @abraunegg

[abraunegg]

LGTM

[lock]

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