From e4e700c362dec9ae30ff144b8eff733476108d33 Mon Sep 17 00:00:00 2001
From: Latent Prion <LatentPrion@gmail.com>
Date: Fri, 17 Oct 2025 12:43:06 -0400
Subject: [PATCH] Changes to CMake toolchain files

We still haven't successfully xcompiled, but we're working
toward it.
---
 cmake/aarch64-linux-gnu.cmake |  2 +-
 cmake/x86_64-linux-gnu.cmake  | 74 +++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 cmake/x86_64-linux-gnu.cmake

diff --git a/cmake/aarch64-linux-gnu.cmake b/cmake/aarch64-linux-gnu.cmake
index 6767693..5a3ab3d 100644
--- a/cmake/aarch64-linux-gnu.cmake
+++ b/cmake/aarch64-linux-gnu.cmake
@@ -31,7 +31,7 @@ set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
 # Search for libraries and headers in the target directories
 set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
 set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
 
 # Set pkg-config to use the cross-compiled libraries
 set(ENV{PKG_CONFIG_PATH} "/usr/aarch64-linux-gnu/lib/pkgconfig:/usr/lib/aarch64-linux-gnu/pkgconfig")
diff --git a/cmake/x86_64-linux-gnu.cmake b/cmake/x86_64-linux-gnu.cmake
new file mode 100644
index 0000000..ddf2354
--- /dev/null
+++ b/cmake/x86_64-linux-gnu.cmake
@@ -0,0 +1,74 @@
+# ----------------------------------------------------------------------------------
+# MANDATORY USER VARIABLE
+# ----------------------------------------------------------------------------------
+# IMPORTANT: This variable MUST be set when running CMake to specify where the
+# laptop's sysroot (the root directory of the mounted laptop filesystem) is located.
+#
+# Usage example: cmake -DCMAKE_TOOLCHAIN_FILE=laptop_x86_sysroot.cmake
+#                      -DTARGET_SYSROOT=/mnt/laptop_sysroot/ <path_to_source>
+#
+# If the variable is not defined, we fall back to a common system root path for safety.
+if(NOT DEFINED TARGET_SYSROOT)
+    set(TARGET_SYSROOT "/usr/lib/x86_64-linux-gnu")
+    message(STATUS "TARGET_SYSROOT not explicitly defined. Defaulting to ${TARGET_SYSROOT}")
+endif()
+
+# ----------------------------------------------------------------------------------
+# SYSROOT and COMPILER CONFIGURATION
+# ----------------------------------------------------------------------------------
+
+set(CMAKE_CROSSCOMPILING TRUE)
+# 1. Architecture and Platform Identification
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+set(TARGET_TRIPLE x86_64-linux-gnu) # Standard Debian/Ubuntu triple
+
+# 2. Set the CMAKE_SYSROOT using the user-defined variable
+set(CMAKE_SYSROOT ${TARGET_SYSROOT})
+message(STATUS "Using CMAKE_SYSROOT: ${CMAKE_SYSROOT}")
+
+# 3. Specify the Cross Compilers
+# These binaries must be installed on your RPi:
+# sudo apt install g++-x86-64-linux-gnu gcc-x86-64-linux-gnu
+set(CMAKE_C_COMPILER   ${TARGET_TRIPLE}-gcc)
+set(CMAKE_CXX_COMPILER ${TARGET_TRIPLE}-g++)
+
+# ----------------------------------------------------------------------------------
+# PKG-CONFIG CONFIGURATION (CRUCIAL FOR CROSS-COMPILING)
+# ----------------------------------------------------------------------------------
+
+# 1. Define the search path for .pc files, relative to the sysroot.
+# This ensures we look in the target's standard pkgconfig locations.
+set(PKG_CONFIG_SEARCH_PATHS
+    "${CMAKE_SYSROOT}/usr/lib/${TARGET_TRIPLE}/pkgconfig" # Primary location on Debian/Ubuntu
+    "${CMAKE_SYSROOT}/usr/share/pkgconfig"               # Secondary shared location
+    "${CMAKE_SYSROOT}/usr/lib/pkgconfig"                 # Another common location
+)
+
+# Join the paths using the system's path separator (colon on Linux)
+string(REPLACE ";" ":" PKG_CONFIG_LIBDIR_STRING "${PKG_CONFIG_SEARCH_PATHS}")
+
+# Set the environment variable PKG_CONFIG_LIBDIR
+# This tells pkg-config exactly where to find the x86_64 .pc files.
+# 2. Set the sysroot directory for pkg-config
+# This tells pkg-config to prepend CMAKE_SYSROOT to any paths it finds in the .pc files.
+set(ENV{PKG_CONFIG_SYSROOT_DIR} ${CMAKE_SYSROOT})
+set(ENV{PKG_CONFIG_LIBDIR} ${PKG_CONFIG_LIBDIR_STRING})
+set(ENV{PKG_CONFIG_PATH} "")
+
+message(STATUS "PKG_CONFIG_SYSROOT_DIR set to: ${CMAKE_SYSROOT}")
+message(STATUS "PKG_CONFIG_LIBDIR set to: ${PKG_CONFIG_LIBDIR_STRING}")
+
+# ----------------------------------------------------------------------------------
+# CMAkE FIND BEHAVIOR
+# ----------------------------------------------------------------------------------
+
+# The CMAKE_FIND_ROOT_PATH tells CMake where to look for programs, libraries, etc.
+set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
+
+# Restrict search to the sysroot, not in the RPi's native locations,
+# but allow programs (like pkg-config itself) to be found on the RPi.
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)