undefined reference to `__cxa_guard_acquire' - was: Template issues?! #1498
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Is the "template" feature missing with the compiler the esp8266/Arduino is using? |
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Come on... Anyone out there working with templates? |
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A bunch of ESP8266 libraries use templates, like ESP8266WebServer and EEPROM, so I don't think there is a constraint from the compiler end. Perhaps you could point to the complete code you are trying to port? |
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template are working on the esp8266 Arduino/libraries/EEPROM/EEPROM.h Lines 41 to 58 in 342c4ae |
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Thanks for feedback. The code I'm trying to port: https://github.com/KONNEKTING/KonnektingDeviceLibrary --> https://github.com/KONNEKTING/KonnektingDeviceLibrary/blob/master/KnxDevice.cpp#L239 As I said: I'm not a real c++ expert. Would be great if someone could give me a hint on what's wrong?! (even if this is not a topic for this issue-tracker) thanks a lot, Alex |
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Had a bit time to further investigate... If I testwise remove the templates which use "unsigned char", I no longer get the duplicate-error. But: This tells me: the template with the unsigned char type is missing ?! So, it has to do - somehow - with the unsigned char template. Any ideas? best regards, |
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undefined reference to __cxa_guard_release is the problem here. |
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Of course it's undefined, I commented out the template with the "unsigned char" type, but another code part still uses it.... All i wanted to show is: my templates are working, except the unsigned char type templates... The actual problem is, when I use the template with type "unsigned char", I get duplicate erors... See above. |
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Steps to reproduce:
You will get error: |
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@Links2004 |
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If I understood the linked issue correctly, one should not declare static variables and initialize them by a methode call at once. Problem is: I don't find such a "declare static and initialize by method call" constellation in my code. My code makes use of a static class instance to access the API of the library. I try to explain with some code snippets: From the header (of the library I try to port to ESP8266): The static instance of the main class of the library: public:
static KnxDevice Knx; // unique KnxDevice instance (singleton design pattern)The constructor itself is private, singleton-pattern... just use the static instance. // Constructor, Destructor
KnxDevice(); // private constructor (singleton design pattern)
~KnxDevice() {} // private destructor (singleton design pattern)
KnxDevice (const KnxDevice&); // private copy constructor (singleton design pattern) The user can then use the singleton to access the library: Knx.write(2, true );The above shown "write" command is one of the templated-methods: template e_KnxDeviceStatus KnxDevice::write <boolean>(byte objectIndex, boolean value);
template e_KnxDeviceStatus KnxDevice::write <unsigned char>(byte objectIndex, unsigned char value);
template e_KnxDeviceStatus KnxDevice::write <char>(byte objectIndex, char value);
template e_KnxDeviceStatus KnxDevice::write <unsigned int>(byte objectIndex, unsigned int value);
template e_KnxDeviceStatus KnxDevice::write <int>(byte objectIndex, int value);
template e_KnxDeviceStatus KnxDevice::write <unsigned long>(byte objectIndex, unsigned long value);
template e_KnxDeviceStatus KnxDevice::write <long>(byte objectIndex, long value);
template e_KnxDeviceStatus KnxDevice::write <float>(byte objectIndex, float value);
template e_KnxDeviceStatus KnxDevice::write <double>(byte objectIndex, double value);So, I don't see the same case explained in issue #500, but according to the latest build error (fixed some other smaller things, the duplicate is now gone), it's somehow related to this issue: So I'm still lost :-( p.s. the duplicate error mentioned at the beginning is gone, if I add "-fpermissive" (which I found at the end of the error message as a hint) to the gcc call. Required me to modify platform.txt a bit:
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tuxedo0801
changed the title
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Both issues fixed: the guard issue is fixed by a PR and the duplicate error is fixed by changing one template from type "boolean" to "bool". |
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tuxedo0801 can you explain how you fixed this? I replaced all the boolean to bool in KnxDevice.cpp and KnxDevice.h. But i don't really understand the "the guard issue is fixed by a PR" part. |
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The actual issue was already discussed here: #500 And @iggr fixed this about 18 days ago: c62858f But there is no release that contains this bugfix. I guess it will be available soon: https://github.com/esp8266/Arduino/releases Look forward for release 2.1.0-RC3 or final 2.1.0 ... |
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Hi there,
I'm not a real C++ expert, but trying to port a arduino library to esp8266/Arduino... (working with Arduino IDE 1.6.6 on Debian Linux 8 arm64 and 2.1.0-rc2 via boardmanager)
I thought doing a #ifdef here and there would do it. But now I'm struggling with this issue:
When compiling, I get the following error:
And that's the corresponding KnxDevice.cpp (line 235-243):
and the related snippet from the header file:
Of course it's a kind of duplicate, but with a different type flavor.
With arduino board the code compiles fine.
Any hints on this?
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