[ET Trac] [Einstein Toolkit] #1128: Require C99 for Cactus C thorns

[Einstein Toolkit]

#1128: Require C99 for Cactus C thorns
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 Reporter:  hinder       |       Owner:     
     Type:  enhancement  |      Status:  new
 Priority:  major        |   Milestone:     
Component:  Cactus       |     Version:     
 Keywords:               |  
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 According to Erik, all systems that we need to support have good support
 for C99.  Many thorns use some features of C99, and it is a common error
 to try to compile these without using the C99 options to a compiler.  The
 resulting error messages can be confusing.

 In order to provide a common language platform for Cactus thorn writers,
 we should state that Cactus expects the compiler to have C99 enabled.  We
 should test this during the configure stage and abort with a good error
 message if it is not the case.  Thorn writers can then assume the standard
 features of C99 will always be available.

 The automatically-configured compiler options in known_architectures
 should be modified to enable C99 mode if it is not enabled by default for
 all the recognised compilers.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1128>
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