[Compile or cmake problems]

My problem was insufficient RAM - running the build on a VM with only 512 MB.

Probably makes sense to mention this in the 'Requirements' page.

[Compile or cmake problems]

Thanks. It was 14.04 LTS. Didn't think it was so old... I'll try 15.10.

[Compile or cmake problems]

Ubuntu 14, clean install, all setup exactly as per https://trinitycore.atlassian.net/wiki/display/tc/Linux+Requirements

Error building  3.3.5 branch:

[  2%]Built target jemalloc
[  7%] Built target g3dlib
[  7%] Built target Detour
[  8%] Built target Recast
[  8%] Built target format
[  9%] Built target gsoap
[  9%] Built target mpq
[  9%] Built target revision_data.h
[  9%] Built target commonPCH.cpp_dephelp
[ 10%] Built target generate_commonPCH.cpp
[ 13%] Built target common
[ 13%] Built target databasePCH.cpp_dephelp
[ 13%] Built target generate_databasePCH.cpp
[ 13%] Building CXX object src/server/database/CMakeFiles/database.dir/Database/Implementation/LoginDatabase.cpp.o
In file included from <command-line>:0:0:
/usr/include/stdc-predef.h:59:1: error: one or more PCH files were found, but they were invalid
 #endif
 ^
/usr/include/stdc-predef.h:59:1: error: use -Winvalid-pch for more information
/usr/include/stdc-predef.h:59:1: fatal error: /home/vagrant/TrinityCore/build/src/server/database/databasePCH.h: No such file or directory
compilation terminated.
make[2]: *** [src/server/database/CMakeFiles/database.dir/Database/Implementation/LoginDatabase.cpp.o] Error 1
make[1]: *** [src/server/database/CMakeFiles/database.dir/all] Error 2
make: *** [all] Error 2
 

Please help.