Possibly remove $$(BUILD_ARCH) from .pro's or document setting BUILD_ARCH in Readme

[csmoore]

Currently in the .pro's, the environment variable BUILD_ARCH needs set to x86 in order to build 32-bit.

This line may not be necessary:

QMAKE_TARGET.arch = $$(BUILD_ARCH)

It forces the user to set the environment variable BUILD_ARCH in order to build x86 (the pro's default to x86_64 if this is not set)

QMAKE_TARGET.arch is already set by qmake on Windows, but never set to anything on Linux.

Adding in this block will handle the Linux cases where QMAKE_TARGET.arch isn’t set. unix:{ eval(QMAKE_TARGET.arch = ""):{

QMAKE_TARGET.arch isn't set properly on Linux.

# If we get a bitset-specific mkspec, use it
linux-g++-32:QMAKE_TARGET.arch = x86
linux-g++-64:QMAKE_TARGET.arch = x86_64

# If we get a generic one, then determine the
# arch of the machine and assign
linux-g++:{
  ARCH = $$system(uname -m) # i686 or x86_64
  contains(ARCH, x86_64):{
    QMAKE_TARGET.arch = x86_64
  }
  else{
    QMAKE_TARGET.arch = x86
  }
} # linux-g++

} # eval } # unix

[csmoore]

This has been changed, so .pro config settings are no longer needed. Rather than settings in the .pro, the AGS Qt Runtime is now configured by adding this file <path to qt sdk>\mkspecs\features\esri_runtime_qt_10_2.prf