Hello, I have compiled root (git master) using gcc 4.9.2 on Linux RHES 6.4 using cmake (cmake Log can be provided): However, when trying to run the tutorial examples, root reports unresolved symbols (see below). $ root graph.C error: OPTIMIZE predefined macro was enabled in PCH file but is curre…

Hi, having same problem when building ROOT 5.34.02 on debian, it turned out to be caused by default debian g++ flags - namely these two: -fstack-protector-strong -D_FORTIFY_SOURCE=2 Removing them fixed the problem. Pavel

Hi, It’s fixed now. This cannot be the same problem in ROOT 5 because that doesn’t use cling. Cheers, Axel.

Hi, I’m running into the same bug. Before updating my toolchain, I would like to know if this is fixed in 6.05.02? I cannot seem to find its ChangeLog, and I cannot discern whether that is supposed to be a stable release, this information appears to have been lost in the website upgrade. Thanks! …

I am getting this same error on CentOS 8. Did you install from source again with these flags? Where did you exactly put these flags?

These are the compiler flags (CMAKE_CXX_FLAGS I believe). Running “cmake -LAH” should show you, what flags CentOS is trying to use: search for “Compiler Flags” in the output of the “cmake -LAH” command. PS: But, it is long time ago I reported that (and obviously for the wrong ROOT version), things …

[image] reznicek: g++ flags Following is what I get after running cmake -LAH and searching for compiler flags. It has > 100 compiler flags. Which one should I look for? cmake-flags.txt (92.8 KB)

We need way more info: how did you get ROOT? what do you do to see the error? which platform / compiler? Also, please start new threads in the future, instead of reviving 5 year old threads :slight_smile:

The log you have provided did not pass well (see the error at the very beginning). The g++ flags thus did not show up (the flags you see are cmake flags). The cmake -LAH command needs to be run using the pure downloaded root source.

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Unresolved symbol cling::runtime::gCling for tutorial examples

Cling

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