[flang] [llvm] [flang-rt] Runtime implementation of extended intrinsic function SECNDS() (PR #152021)

[Andre Kuhlenschmidt via llvm-commits]

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@@ -309,6 +310,12 @@ std::int32_t RTNAME(Hostnm)(
   return status;
 }
 
+float RTNAME(Secnds)(float *refTime, const char *sourceFile, int line) {
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akuhlens wrote:

I assume the separation of `Secnds` to lower case `secnds` is to allow you to test it in this PR. Command.h seems to be runtime functions related to the command line, so I think extenssions.cpp/h is the right place for this not command.h. Maybe add the argument checking back to the implementation in extenssions.cpp and test the function in a unit test?

https://github.com/llvm/llvm-project/pull/152021