[Help-glpk] Patch to configure a reentrant version of GLPK

[Chris Matrakidis]

Andrew,

The attached patch adds the --enable-reentrant option to configure
(disabled by default) as suggested by David Monniaux a few days ago
[1]. When selected, the appropriate thread local storage class
specifier is identified, added to config.h and used in tls.c. The
patch is based on the work of Dmitry Nadezhin [2] and the ax_tls macro
form the autoconf archive [3] simplified to match the configure.ac
style, The code remains C89 if the option is not selected.

I have tested this extensively but only on Linux with gcc, so
additional testing and feedback is welcome.

Best Regards,

Chris Matrakidis


[1] http://lists.gnu.org/archive/html/help-glpk/2016-12/msg00023.html
[2] https://github.com/nadezhin/thermocompensation
[3] http://www.gnu.org/software/autoconf-archive/ax_tls.html

tls.patch
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