🐛 Fix missing env & cmake definitions for native builds

- Add ar, ld, nm, objcopy, objdump, ranlib, strip to cpp_info executables
- Expand CMake variables to include all compiler and utility tools
- Define standard environment variables (CC, CXX, AS, AR, LD, NM, etc.) in buildenv
- Add README section documenting how to build tools for platforms using the toolchain

Author: kammce

.github/workflows/verify.yml

@@ -78,3 +78,6 @@ jobs:
       - name: 📦 Build Demos Conan Package
         if: ${{ runner.os == 'Windows' }}
         run: conan build demos/cpp-modules -pr llvm-${{ inputs.version }} -pr ${{ inputs.demo_profile }}
+
+      - name: ⚙️ Build ninja for build platform from scratch
+        if: conan install --tool-requires="ninja/1.13.2" --build="ninja/*" -pr:a llvm-${{ inputs.version }} -pr:a ${{ inputs.demo_profile }}

README.md

@@ -520,3 +520,15 @@ Once you've verified everything works:
 2. Submit a pull request with a clear description of the version being added
 3. Include any platform-specific notes or limitations
 4. Note any version mismatches between upstream LLVM and ARM Embedded Toolchain
+
+### Testing Building tools for Platforms
+
+The `llvm-toolchain` can not only be used to build applications for a target
+but also the build tools themselves. For example, if the prebuilt binary for
+Ninja doesn't exist for your platform, your platform will need to build it.
+
+The command to build the Ninja
+
+```bash
+conan install --tool-requires="ninja/1.13.2" --build="ninja/*" -pr:a hal/tc/llvm -pr:a hal/os/mac
+```

all/conanfile.py

@@ -463,23 +463,50 @@ def package_info(self):
             "c": "clang",
             "cpp": "clang++",
             "asm": "clang",
+            "ar": "llvm-ar",
+            "ld": "lld",
+            "nm": "llvm-nm",
+            "objcopy": "llvm-objcopy",
+            "objdump": "llvm-objdump",
+            "ranlib": "llvm-ranlib",
+            "strip": "llvm-strip",
         })
 
-        # Add CMake utility tools
+        # Add CMake compiler and utility tools
         cmake_extra_variables = {
+            "CMAKE_C_COMPILER": "clang",
+            "CMAKE_CXX_COMPILER": "clang++",
+            "CMAKE_ASM_COMPILER": "clang",
+            "CMAKE_LINKER": "lld",
+            "CMAKE_AR": "llvm-ar",
+            "CMAKE_NM": "llvm-nm",
             "CMAKE_OBJCOPY": "llvm-objcopy",
-            "CMAKE_SIZE_UTIL": "llvm-size",
             "CMAKE_OBJDUMP": "llvm-objdump",
-            "CMAKE_AR": "llvm-ar",
             "CMAKE_RANLIB": "llvm-ranlib",
-            "CMAKE_CXX_SCAN_FOR_MODULES": "ON",
+            "CMAKE_STRIP": "llvm-strip",
+            "CMAKE_SIZE_UTIL": "llvm-size",
+            "CMAKE_ADDR2LINE": "llvm-addr2line",
             "CMAKE_EXPERIMENTAL_EXPORT_PACKAGE_DEPENDENCIES": "1942b4fa-b2c5-4546-9385-83f254070067",
         }
 
         self.conf_info.update(
             "tools.cmake.cmaketoolchain:extra_variables", cmake_extra_variables)
 
         self.buildenv_info.define("LLVM_INSTALL_DIR", self.package_folder)
+        self.buildenv_info.define("CC", "clang")
+        self.buildenv_info.define("CXX", "clang++")
+        self.buildenv_info.define("AS", "clang")
+        self.buildenv_info.define("AR", "llvm-ar")
+        self.buildenv_info.define("LD", "lld")
+        self.buildenv_info.define("NM", "llvm-nm")
+        self.buildenv_info.define("OBJCOPY", "llvm-objcopy")
+        self.buildenv_info.define("OBJDUMP", "llvm-objdump")
+        self.buildenv_info.define("RANLIB", "llvm-ranlib")
+        self.buildenv_info.define("SIZE", "llvm-size")
+        self.buildenv_info.define("STRINGS", "llvm-strings")
+        self.buildenv_info.define("STRIP", "llvm-strip")
+        self.buildenv_info.define("ADDR2LINE", "llvm-addr2line")
+        self.buildenv_info.define("GDB", "lldb")
 
         if self.settings_target:
             self.add_common_flags()

conan/profiles/v1/llvm-20

@@ -4,10 +4,19 @@ compiler.cppstd=23
 compiler.libcxx=libc++
 compiler.version=20
 
+{% if context == "host" %}
+
 [tool_requires]
 llvm-toolchain/20
 cmake/[>=3.28.0 <5.0.0]
 ninja/[^1.0.0]
 
 [conf]
 tools.cmake.cmaketoolchain:generator=Ninja
+
+{% elif context == "build" %}
+
+[tool_requires]
+!llvm-toolchain/*:llvm-toolchain/20,cmake/[>=3.28.0 <5.0.0]
+
+{% endif %}