build : add LLAMA_OPENSSL option (#16287)

Introduce a new `LLAMA_OPENSSL` option, enabled by default.

This preserves the previous default (libcurl first, OpenSSL as fallback),
while allowing OpenSSL to be disabled if desired.

Signed-off-by: Adrien Gallouët <angt@huggingface.co>

CMakeLists.txt

@@ -92,6 +92,7 @@ option(LLAMA_TOOLS_INSTALL  "llama: install tools"        ${LLAMA_TOOLS_INSTALL_
 
 # 3rd party libs
 option(LLAMA_CURL       "llama: use libcurl to download model from an URL" ON)
+option(LLAMA_OPENSSL    "llama: use openssl to download model from an URL" ON)
 option(LLAMA_LLGUIDANCE "llama-common: include LLGuidance library for structured output in common utils" OFF)
 
 # Required for relocatable CMake package

common/CMakeLists.txt

@@ -87,7 +87,8 @@ if (LLAMA_CURL)
     target_compile_definitions(${TARGET} PUBLIC LLAMA_USE_CURL)
     include_directories(${CURL_INCLUDE_DIRS})
     set(LLAMA_COMMON_EXTRA_LIBS ${LLAMA_COMMON_EXTRA_LIBS} ${CURL_LIBRARIES})
-else()
+
+elseif (LLAMA_OPENSSL)
     find_package(OpenSSL)
     if (OpenSSL_FOUND)
         include(CheckCSourceCompiles)