Make CURL dependency optional in tools/run/CMakeLists.txt

[Copilot]

Description

CMake configuration fails on Windows when CURL is unavailable because tools/run/CMakeLists.txt uses find_package(CURL REQUIRED), while common/CMakeLists.txt correctly makes CURL optional with cpp-httplib fallback.

Changes:

• Remove REQUIRED flag from find_package(CURL) in tools/run/CMakeLists.txt
• Add fallback logic matching common/CMakeLists.txt: disable CURL when not found, emit warning
• When CURL unavailable, llama-run uses cpp-httplib via common library (already supported in code)

# Before
if (LLAMA_CURL)
    find_package(CURL REQUIRED)  # Fails entire config if CURL missing
    # ...
endif ()

# After
if (LLAMA_CURL)
    find_package(CURL)  # Optional
    if (NOT CURL_FOUND)
        message(WARNING "Could NOT find CURL. Falling back to cpp-httplib...")
        set(LLAMA_CURL OFF)
    else()
        # ... configure CURL
    endif()
endif ()

The run.cpp implementation already handles both code paths via conditional compilation (#ifdef LLAMA_USE_CURL).

Original prompt

Your "FIX" did not fix my build issues.

C:\Users\kens\source\repos\llama.cpp>git pull origin master
From https://github.com/TheOriginalBytePlayer/llama.cpp

• branch master -> FETCH_HEAD
  Already up to date.

C:\Users\kens\source\repos\llama.cpp>cmake -B build
-- Selecting Windows SDK version 10.0.26100.0 to target Windows 10.0.26200.
CMAKE_BUILD_TYPE=
-- Warning: ccache not found - consider installing it for faster compilation or disable this warning with GGML_CCACHE=OFF
-- CMAKE_SYSTEM_PROCESSOR: AMD64
-- CMAKE_GENERATOR_PLATFORM:
-- GGML_SYSTEM_ARCH: x86
-- Including CPU backend
-- x86 detected
-- Adding CPU backend variant ggml-cpu: /arch:AVX512 GGML_AVX512
-- ggml version: 0.9.5
-- ggml commit: 246f5702
-- Could NOT find CURL (missing: CURL_LIBRARY CURL_INCLUDE_DIR)
CMake Warning at common/CMakeLists.txt:102 (message):
Could NOT find CURL. Falling back to cpp-httplib. Hint: to explicitly
disable CURL, set -DLLAMA_CURL=OFF

CMake Error at C:/Program Files/CMake/share/cmake-4.0/Modules/FindPackageHandleStandardArgs.cmake:227 (message):
Could NOT find CURL (missing: CURL_LIBRARY CURL_INCLUDE_DIR)
Call Stack (most recent call first):
C:/Program Files/CMake/share/cmake-4.0/Modules/FindPackageHandleStandardArgs.cmake:591 (_FPHSA_FAILURE_MESSAGE)
C:/Program Files/CMake/share/cmake-4.0/Modules/FindCURL.cmake:211 (find_package_handle_standard_args)
tools/run/CMakeLists.txt:7 (find_package)

-- Configuring incomplete, errors occurred!

C:\Users\kens\source\repos\llama.cpp>

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[Copilot]

Pull request overview

This PR makes the CURL dependency optional in tools/run/CMakeLists.txt to prevent build failures on Windows when CURL is unavailable, matching the fallback behavior already implemented in common/CMakeLists.txt.

• Removes REQUIRED flag from find_package(CURL) to make CURL optional
• Adds conditional fallback logic that disables CURL and emits a warning when CURL is not found
• Ensures llama-run can use cpp-httplib through the common library when CURL is unavailable

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