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by henrikt on 24 Apr 2017 08:51 UTC**\nThe current hack (mentioned in #960) for calling the external FORTRAN `dgees` from `Modelica.Math.Matrices.LAPACK.dgees` results in code that is not legal C++ since the pointer types don't match.  I don't see why tools should be forced to generate C code in order to \"just\" get a warning for the hack instead of an error when compiling the code.\n\nSince generating FORTRAN functions that can be passed via function pointers to in external FORTRAN calls would require considerable design work as well as work on the part of the tool vendors, it would be more reasonable to just provide a way to pass a null pointer to external functions.\n\nThe null pointer would not need to be a Modelica value, not be stored, not have a type, etc.  All that we would need is a way to indicate where a null pointer is to be passed in the argument list of an external function call.\n\nTo start the discussion, I propose the following syntax:\n```\n  external \"FORTRAN 77\" dgees(\"V\", \"N\", external 0, n, T, lda, …\n```\nUsing `external 0` instead of, for instance, `NULL` avoids the need to introduce a new keyword.\n\n----\n\nMigrated-From: https://trac.modelica.org/Modelica/ticket/2183"},"comment":{"url":"https://api.github.com/repos/modelica/ModelicaSpecification/issues/comments/435705972","html_url":"https://github.com/modelica/ModelicaSpecification/issues/2183#issuecomment-435705972","issue_url":"https://api.github.com/repos/modelica/ModelicaSpecification/issues/2183","id":435705972,"node_id":"MDEyOklzc3VlQ29tbWVudDQzNTcwNTk3Mg==","user":{"login":"modelica-trac-importer","id":22202507,"node_id":"MDQ6VXNlcjIyMjAyNTA3","avatar_url":"https://avatars1.githubusercontent.com/u/22202507?v=4","gravatar_id":"","url":"https://api.github.com/users/modelica-trac-importer","html_url":"https://github.com/modelica-trac-importer","followers_url":"https://api.github.com/users/modelica-trac-importer/followers","following_url":"https://api.github.com/users/modelica-trac-importer/following{/other_user}","gists_url":"https://api.github.com/users/modelica-trac-importer/gists{/gist_id}","starred_url":"https://api.github.com/users/modelica-trac-importer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/modelica-trac-importer/subscriptions","organizations_url":"https://api.github.com/users/modelica-trac-importer/orgs","repos_url":"https://api.github.com/users/modelica-trac-importer/repos","events_url":"https://api.github.com/users/modelica-trac-importer/events{/privacy}","received_events_url":"https://api.github.com/users/modelica-trac-importer/received_events","type":"User","site_admin":false},"created_at":"2018-11-04T21:05:22Z","updated_at":"2018-11-04T21:05:22Z","author_association":"COLLABORATOR","body":"**Comment by hansolsson on 19 Oct 2017 08:34 UTC**\nMartin: One possibility is to just use C-version of Lapack\nHans: Another possibility is to provide a few C-macros so that one can write the C-wrapper calling Fortran as an include-annotation in Modelica (name mangling and more?); see f2c.h\n\nMartin S: Explained by NULL() in external call does not influence grammar, but need separate semantics.\n\nPoll for possibilities:\n1. Nothing: 1\n2. \"external 0\": 1\n3. NULL() - possibly NULLFunction(): 5\n4. Standarize C-version of Lapack: 4\n5. C-macros for calling Fortran: 1\nMight consider a slightly different name (to avoid confusion with C-macro).\n\n\n"}}
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