| --- Log opened Sun Mar 31 00:00:02 2019 |
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| 03:23 | | * McMartin attempts something Unwise. |
| 03:25 | <&McMartin> | So far so good. |
| 03:25 | | * McMartin breaks for dinner. |
| 05:10 | | Derakon is now known as Derakon[AFK] |
| 05:16 | <&McMartin> | Post-dinner: failcannon |
| 05:16 | <&McMartin> | It looks like the MinGW linker cannot do this stunt. |
| 05:20 | <&[R]> | What stunt? |
| 05:27 | <&McMartin> | Linking against a DLL using symbols that the DLL does not export |
| 05:27 | <&[R]> | Ah |
| 05:27 | <&McMartin> | With a mapping to symbols it *does* export |
| 05:28 | <&McMartin> | (The use case here is wrapping a DLL with a shim at build time without relying on runtime symbol-extraction hackery like dlsym - Linux has a flat namespace and so *requires* dlsym to do the trick, but Windows in principle does not) |
| 05:29 | <@celticminstrel> | Doesn't MinGW essentially use the Linux linker |
| 05:29 | <&McMartin> | I found an anomaly in my testing that I will need to investigate further |
| 05:30 | <&McMartin> | But the short answer is "no, the two-level namespace stuff is intrinsic to the PE32 executable format and under normal circumstances that's how it works" |
| 05:30 | <&McMartin> | In particular, if you have lib1a and lib1b which define the same symbol |
| 05:30 | <&McMartin> | And lib2a and lib2b which call that symbol and link only 1a or 1b, respectively |
| 05:30 | <&McMartin> | A program can link lib2a and lib2b and there will not be any symbol confusion, even with MinGW |
| 05:30 | <&McMartin> | But GetModuleHandle did not behave the way I expected it to, while LoadLibrary did |
| 05:31 | <&McMartin> | I'm going to need to run parallel tests in Visual Studio to see what's up. |
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| 05:32 | <&McMartin> | MinGW has a utility called dlltool which can fabricate import libraries out of module definition files that seem to be in ELF object formats and thus Suitable For MinGW, but actually using them just causes any program that links the resulting library to crash with the NTSTATUS ERROR_ENTRY_POINT_NOT_FOUND |
| 05:33 | <&McMartin> | So take two will be to flip the script and do it with the MSVC Librarian tool. |
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| --- Log closed Mon Apr 01 00:00:04 2019 |