Windows omc cannot target C language: "dladdr failed: not available"

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Windows omc cannot target C language: "dladdr failed: not available"

Windows omc cannot target C language: "dladdr failed: not available"

Feb-17-17 17:11:13

I'm attempting to use OMC with the C language target on Windows 7 32-bit with OpenModelica1.11.0-32bit. I've also attempted the same procedure with OpenModelica1.12.0-dev-32bit with the same results. When I run omc -s path/to/MyModel.mo, I get the following error:

Code:


dladdr failed: not available on Windows failed

Error processing file: path/to/MyModel.mo

Error: Failed to write to file (not open)

Error: Template error: A template call failed (a call with 0 parameters: dladdr

failed: not available on Windows). One possible reason could be that a template

imported function call failed (which should not happen for functions called from

 within template code; templates preserve pure 'match'/non-failing semantics).



# Error encountered! Exiting...

# Please check the error message and the flags.

I'm not sure why OMC is trying to use dladdr on Windows. There is a bug report that also contains this error, but was two months ago--long before the two releases I'm using were released. Anyone else having an issue targeting C on Windows?

watkipet: 13 Posts; Thank you [ 0 ]

#7619 Permalink

Re: Windows omc cannot target C language: "dladdr failed: not available"

Feb-17-17 17:15:17

This seems to be an error in 32bit OM. It works fine with the 64bit OM. Do you specifically need the 32bit one?

adrpo: 885 Posts; Thank you [ 141 ]

#7620 Permalink

Re: Windows omc cannot target C language: "dladdr failed: not available"

Feb-17-17 17:48:18

Yeah--we're only allowed to run 32-bit Windows at my work, so I have to use the 32-bit version of OM. I've done a little tracing:

1) The dladdr call is available on *NIX systems (Linux, OS X) but not Windows. The Windows way of performing the same task is GetModuleFilename(). The LibGW32C for Windows project also provides a compatibility layer.
2) OMCompilter/Compiler/runtime/systemimpl.c provides SystemImpl__dladdr(). On MINGW32, it returns two strings: "dladdr failed" and "not available on Windows".
3) OMCompiler/Compiler/Util/System.mo has _dladdr() which calls the function above. dladdr() calls _dladdr().
4) dladdr() is called many places, but in my case, the call appears to be in OMCompiler/Compiler/SimCode/SimCodeMain.mo:runCodegenFunc(). I think the dladdr() function is called when the return value of the passed in func() is not defined.

So now I have a few questions:
1) Why is the conditional compile in #2 only checking MINGW32? Is dladdr available on MINGW64 but not MINGW32?
3) If dladdr isn't available on some platforms, why do we use it as if it's always available (such as in #4)?

watkipet: 13 Posts; Thank you [ 0 ]

#7621 Permalink

Re: Windows omc cannot target C language: "dladdr failed: not available"

Feb-17-17 23:45:20

I will do some debugging of my own to fix this. I had no time to look too deep into this as I'm the one fixing Windows issues, but thanks for your investigation.
What I find really strange is that mingw64 works fine but mingw32 does not.

Your questions:
1) MINGW32 is defined in both mingw64 and mingw32
2) In general we try to keep the same Linux based interface and write small Windows layers to implement missing functions, but somehow this one escaped me.