Refactor QNX toolchain CMake settings

Author: pablorcum

toolbox/overlay-triplets/qnx-toolchain.cmake

@@ -40,13 +40,20 @@ set(CMAKE_CXX_COMPILER_TARGET ${QNX_QCC_VARIANT})
 #   $QNX_TARGET/aarch64le
 #   $QNX_TARGET/armle-v7
 #   $QNX_TARGET/x86_64
-set(CMAKE_SYSROOT "$ENV{QNX_TARGET}/${QNX_SYSROOT_SUFFIX}")
+set(CMAKE_SYSROOT "$ENV{QNX_TARGET}")
+set(CMAKE_FIND_ROOT_PATH "${CMAKE_SYSROOT}" CACHE PATH "")
+set(CMAKE_PREFIX_PATH ${CMAKE_SYSROOT}/${QNX_SYSROOT_SUFFIX}; ${CMAKE_SYSROOT}/${QNX_SYSROOT_SUFFIX}/usr)
 
-# Make sure CMake finds things in the QNX sysroot first
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)
+# Host tools only (executables used during configure/build)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+# Target artifacts only (resolved via sysroot / root path)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+
+# Avoid try_run / executable checks during configuration on a cross build.
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
 
 # Optional: if some projects try to use GNU ar/ranlib/nm directly, point to QNX tools
 # But usually qcc/q++ + -V variant is enough.
@@ -57,9 +64,3 @@ set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)
 # QNX doesn’t use glibc; some ports may need feature tests or POSIX settings.
 add_compile_definitions(_QNX_SOURCE)
 add_compile_definitions(__GNU__)
-
-# Set fPIC flag
-set(CMAKE_POSITION_INDEPENDENT_CODE ON)
-
-# Do not treat include directories from the interfaces of consumed Imported Targets as system directories.
-set(CMAKE_NO_SYSTEM_FROM_IMPORTED ON)