build: support building conan recipes on Linux

Teach build_recipes.py to recognize Linux-x86_64 as a host (it used to
sys.exit on Linux) and add Linux-x86_64 to the platforms list of every
recipe that can target it: assimp, clipp, debugbreak, libclang, qt and
dxc. molten-vk stays macOS-only.

Verified on Linux/gcc-13/x86_64 via conan create: clipp, debugbreak,
assimp, libclang and qt all build, package and (where applicable) pass
their test_package. dxc also gets its packaging fixed -- package() now
copies installed/lib on Linux as well as macOS, so libdxcompiler.so is
shipped (previously only Windows/macOS were handled, leaving the Linux
package without the library it declares). The dxc Linux build itself is
not yet verified end-to-end (LLVM-scale source build); the packaging
change mirrors the macOS path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: FlyAndNotDown

ThirdParty/ConanRecipes/assimp/conandata.yml

@@ -1,6 +1,7 @@
 platforms:
   - Windows-x86_64
   - Macos-armv8
+  - Linux-x86_64
 sources:
   "6.0.2-exp":
     url: "https://github.com/assimp/assimp/archive/refs/tags/v6.0.2.tar.gz"

ThirdParty/ConanRecipes/build_recipes.py

@@ -31,7 +31,7 @@
 import yaml
 
 
-SUPPORTED_PLATFORMS = ("Windows-x86_64", "Macos-armv8")
+SUPPORTED_PLATFORMS = ("Windows-x86_64", "Macos-armv8", "Linux-x86_64")
 
 # 'conan graph info' binary states that mean a matching binary already exists (in the local cache or on
 # a remote) and so needs neither building nor downloading-to-rebuild. We skip 'conan create' for these
@@ -46,6 +46,8 @@ def current_platform() -> str:
         return "Windows-x86_64"
     if system == "Darwin" and machine in ("arm64", "aarch64"):
         return "Macos-armv8"
+    if system == "Linux" and machine in ("amd64", "x86_64"):
+        return "Linux-x86_64"
     sys.exit(
         f"error: unsupported host {system}/{platform.machine()}; "
         f"only {', '.join(SUPPORTED_PLATFORMS)} are supported"

ThirdParty/ConanRecipes/clipp/conandata.yml

@@ -1,6 +1,7 @@
 platforms:
   - Windows-x86_64
   - Macos-armv8
+  - Linux-x86_64
 sources:
   "1.2.3-exp":
     url: "https://github.com/muellan/clipp/archive/refs/tags/v1.2.3.tar.gz"

ThirdParty/ConanRecipes/debugbreak/conandata.yml

@@ -1,6 +1,7 @@
 platforms:
   - Windows-x86_64
   - Macos-armv8
+  - Linux-x86_64
 sources:
   "1.0-exp":
     url: "https://github.com/scottt/debugbreak/archive/refs/tags/v1.0.tar.gz"

ThirdParty/ConanRecipes/dxc/conandata.yml

@@ -1,6 +1,7 @@
 platforms:
   - Windows-x86_64
   - Macos-armv8
+  - Linux-x86_64
 sources:
   "1.8.2505.1-exp":
     commit: "b106a961d09221b3c5bdb37be45b679257da08b8"

ThirdParty/ConanRecipes/dxc/conanfile.py

@@ -74,7 +74,9 @@ def package(self):
             copy(self, "d3d12shader.h", os.path.join(self.source_folder, "external", "DirectX-Headers", "include", "directx"), os.path.join(self.package_folder, "include", "dxc"))
             copy(self, "dxil.dll", os.path.join(self.build_folder, "bin"), os.path.join(self.package_folder, "bin"))
             copy(self, "dxcompiler.lib", os.path.join(self.build_folder, "lib"), os.path.join(self.package_folder, "lib"))
-        elif self.settings.os == "Macos":
+        elif self.settings.os in ("Macos", "Linux"):
+            # install-distribution drops the shared compiler (libdxcompiler.dylib /
+            # libdxcompiler.so) under installed/lib on both Unix-likes.
             copy(self, "*", os.path.join(self.build_folder, "installed", "lib"), os.path.join(self.package_folder, "lib"))
 
     def package_info(self):

ThirdParty/ConanRecipes/libclang/conandata.yml

@@ -1,6 +1,7 @@
 platforms:
   - Windows-x86_64
   - Macos-armv8
+  - Linux-x86_64
 sources:
   "22.1.6-exp":
     Windows-x86_64:

ThirdParty/ConanRecipes/qt/conandata.yml

@@ -1,5 +1,6 @@
 platforms:
   - Windows-x86_64
   - Macos-armv8
+  - Linux-x86_64
 versions:
   - "6.10.3-exp"