libGLESv2.dll crashes

Any application that uses shaders crashes at with stack pointing to libGLESv2.dll.

The problem was solved by editing *.pro and *.pri files under qtbase/src/angle to add _SECURE_SCL=0 to DEFINES for every (sub)project under this directory.

Default value for _SECURE_SCL is 1, and linking objects with different _SECURE_SCL values together leads to conflicts between different STL containers implementations. Linker doesn't complain of these conflicts and generates broken code.