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Link to GTSAM-EXPORT doc

release/4.3a0
Varun Agrawal 2021-08-20 11:11:28 -04:00
parent 42b7525337
commit 4c9ce4ca95
2 changed files with 3 additions and 1 deletions
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2
DEVELOP.md
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@ -17,3 +17,5 @@ class GTSAM_EXPORT MyClass { ... };
GTSAM_EXPORT myFunction();
```
More details [here](Using-GTSAM-EXPORT.md).

2
Using-GTSAM-EXPORT.md
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@ -10,7 +10,7 @@ To create a DLL in windows, the `GTSAM_EXPORT` keyword has been created and need
3. If you have defined a class using `GTSAM_EXPORT`, do not use `GTSAM_EXPORT` in any of its individual function declarations. (Note that you _can_ put `GTSAM_EXPORT` in the definition of individual functions within a class as long as you don't put `GTSAM_EXPORT` in the class definition.)
## When is GTSAM_EXPORT being used incorrectly
Unfortunately, using `GTSAM_EXPORT` incorrectly often does not cause a compiler or linker error in the library that is being compiled, but only when you try to use that DLL in a different library. For example, an error in gtsam/base will often show up when compiling the check_base_program or the MATLAB wrapper, but not when compiling/linking gtsam itself. The most common errors will say something like:
Unfortunately, using `GTSAM_EXPORT` incorrectly often does not cause a compiler or linker error in the library that is being compiled, but only when you try to use that DLL in a different library. For example, an error in `gtsam/base` will often show up when compiling the `check_base_program` or the MATLAB wrapper, but not when compiling/linking gtsam itself. The most common errors will say something like:
```
Error LNK2019 unresolved external symbol "public: void __cdecl gtsam::SO3::print(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)const " (?print@SO3@gtsam@@QEBAXAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function "public: static void __cdecl gtsam::Testable<class gtsam::SO3>::Print(class gtsam::SO3 const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?Print@?$Testable@VSO3@gtsam@@@gtsam@@SAXAEBVSO3@2@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) check_geometry_program C:\AFIT\lib\gtsam\build\gtsam\geometry\tests\testSO3.obj