Got linker error on 32bit target.

[wqking]

Got linker error on 32bit target.

[wqking]

What's the error message? Is it a linking error or compiling error? It sounds like a compiling error if uint_64t is not defined on your platform.
Adding flags is ugly, I will find better way to handle it, but please give me the error message first.

[mangrooveforest]

The entire error looks like

Linking .pio/build/esp32dev/firmware.elf
GNU ld (crosstool-NG crosstool-ng-1.22.0-80-g6c4433a) 2.25.1
.pio/build/esp32dev/src/main.o:(.literal._ZN7eventpp9internal_16CallbackListBaseIFvRK5EventE13EventPoliciesE14getNextCounterEv[eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::getNextCounter()]+0x8): undefined reference to `__atomic_fetch_add_8'
  Supported emulations:
.pio/build/esp32dev/src/main.o:(.literal._ZNK7eventpp9internal_16CallbackListBaseIFvRK5EventE13EventPoliciesE11doForEachIfIZNKS7_9forEachIfIZNKS7_clES4_EUlRSt8functionIS5_EE_EEbOT_EUlRSt10shared_ptrINS7_4NodeEEE_EEbSF_[bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::doForEachIf<bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::forEachIf<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}>(eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}&&) const::{lambda(std::shared_ptr<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::Node>&)#1}>(bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::forEachIf<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) con   elf32xtensa
st::{lambda(std::function<void (Event const&)>&)#1}>(eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}&&) const::{lambda(std::shared_ptr<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::Node>&)#1}) const]+0x0): undefined reference to `__atomic_load_8'
.pio/build/esp32dev/src/main.o: In function `eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::getNextCounter()':
main.cpp:(.text._ZN7eventpp9internal_16CallbackListBaseIFvRK5EventE13EventPoliciesE14getNextCounterEv[eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::getNextCounter()]+0x10): undefined reference to `__atomic_fetch_add_8'
main.cpp:(.text._ZN7eventpp9internal_16CallbackListBaseIFvRK5EventE13EventPoliciesE14getNextCounterEv[eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::getNextCounter()]+0x82): undefined reference to `__atomic_fetch_add_8'
.pio/build/esp32dev/src/main.o: In function `bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::doForEachIf<bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::forEachIf<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}>(eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}&&) const::{lambda(std::shared_ptr<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::Node>&)#1}>(bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::forEachIf<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}>(eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}&&) const::{lambda(std::shared_ptr<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::Node>&)#1}) const':
main.cpp:(.text._ZNK7eventpp9internal_16CallbackListBaseIFvRK5EventE13EventPoliciesE11doForEachIfIZNKS7_9forEachIfIZNKS7_clES4_EUlRSt8functionIS5_EE_EEbOT_EUlRSt10shared_ptrINS7_4NodeEEE_EEbSF_[bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::doForEachIf<bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::forEachIf<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}>(eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}&&) const::{lambda(std::shared_ptr<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::Node>&)#1}>(bool eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::forEachIf<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}>(eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::operator()(Event const&) const::{lambda(std::function<void (Event const&)>&)#1}&&) const::{lambda(std::shared_ptr<eventpp::internal_::CallbackListBase<void (Event const&), EventPolicies>::Node>&)#1}) const]+0x26): undefined reference to `__atomic_load_8'
collect2: error: ld returned 1 exit status
*** [.pio/build/esp32dev/firmware.elf] Error 1

[wqking]

Thanks for the error message.
It's not that uint_64t is not defined, but your std::atomic doesn't support uint_64t.
I will try to see how to fix it.
Now it's fine that you change it to uint_32t, it's safe.
And since you are on ESP32, if you are sure you don't use multithread, you can also use SingleThreading as the threading policy, that wil not cause linker error.

[wqking]

Fixed