Add support for wolfssl

Author: lapinozz

CMakeLists.txt

@@ -61,10 +61,11 @@ cpr_option(CPR_CURL_USE_LIBPSL "Since curl 8.13 curl depends on libpsl (https://
 cpr_option(CPR_USE_SYSTEM_LIB_PSL "If enabled we will use the psl lib already installed on this system. Else meson is required as build dependency. Only relevant in case 'CPR_CURL_USE_LIBPSL' is set to ON." ${CPR_USE_SYSTEM_CURL})
 cpr_option(CPR_ENABLE_CURL_HTTP_ONLY "If enabled we will only use the HTTP/HTTPS protocols from CURL. If disabled, all the CURL protocols are enabled. This is useful if your project uses libcurl and you need support for other CURL features e.g. sending emails." ON)
 cpr_option(CPR_ENABLE_SSL "Enables or disables the SSL backend. Required to perform HTTPS requests." ON)
-cpr_option(CPR_FORCE_OPENSSL_BACKEND "Force to use the OpenSSL backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, and CPR_FORCE_WINSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
-cpr_option(CPR_FORCE_WINSSL_BACKEND "Force to use the WinSSL backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, and CPR_FORCE_WINSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
-cpr_option(CPR_FORCE_DARWINSSL_BACKEND "Force to use the DarwinSSL backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, and CPR_FORCE_WINSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
-cpr_option(CPR_FORCE_MBEDTLS_BACKEND "Force to use the Mbed TLS backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, and CPR_FORCE_WINSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
+cpr_option(CPR_FORCE_OPENSSL_BACKEND "Force to use the OpenSSL backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, CPR_FORCE_WINSSL_BACKEND and CPR_FORCE_WOLFSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
+cpr_option(CPR_FORCE_WINSSL_BACKEND "Force to use the WinSSL backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, CPR_FORCE_WINSSL_BACKEND and CPR_FORCE_WOLFSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
+cpr_option(CPR_FORCE_DARWINSSL_BACKEND "Force to use the DarwinSSL backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, CPR_FORCE_WINSSL_BACKEND and CPR_FORCE_WOLFSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
+cpr_option(CPR_FORCE_MBEDTLS_BACKEND "Force to use the Mbed TLS backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, CPR_FORCE_WINSSL_BACKEND and CPR_FORCE_WOLFSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
+cpr_option(CPR_FORCE_WOLFSSL_BACKEND "Force to use the WolfSSL backend. If CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, CPR_FORCE_WINSSL_BACKEND and CPR_FORCE_WOLFSSL_BACKEND are set to to OFF, cpr will try to automatically detect the best available SSL backend (WinSSL - Windows, OpenSSL - Linux, DarwinSSL - Mac ...)." OFF)
 cpr_option(CPR_ENABLE_LINTING "Set to ON to enable clang linting." OFF)
 cpr_option(CPR_ENABLE_CPPCHECK "Set to ON to enable Cppcheck static analysis. Requires CPR_BUILD_TESTS and CPR_BUILD_TESTS_SSL to be OFF to prevent checking google tests source code." OFF)
 cpr_option(CPR_BUILD_TESTS "Set to ON to build cpr tests." OFF)
@@ -125,8 +126,8 @@ endif()
 
 # SSL
 if(CPR_ENABLE_SSL)
-    if(CPR_FORCE_OPENSSL_BACKEND OR CPR_FORCE_WINSSL_BACKEND OR CPR_FORCE_DARWINSSL_BACKEND OR CPR_FORCE_MBEDTLS_BACKEND)
-        message(STATUS "Disabled SSL backend auto detect since either CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, or CPR_FORCE_WINSSL_BACKEND is enabled.")
+    if(CPR_FORCE_OPENSSL_BACKEND OR CPR_FORCE_WINSSL_BACKEND OR CPR_FORCE_DARWINSSL_BACKEND OR CPR_FORCE_MBEDTLS_BACKEND OR CPR_FORCE_WOLFSSL_BACKEND)
+        message(STATUS "Disabled SSL backend auto detect since either CPR_FORCE_OPENSSL_BACKEND, CPR_FORCE_DARWINSSL_BACKEND, CPR_FORCE_MBEDTLS_BACKEND, CPR_FORCE_WINSSL_BACKEND, or CPR_FORCE_WOLFSSL_BACKEND is enabled.")
         set(DETECT_SSL_BACKEND OFF CACHE INTERNAL "" FORCE)
     else()
         message(STATUS "Automatically detecting SSL backend.")
@@ -156,7 +157,12 @@ if(CPR_ENABLE_SSL)
                 if(MBEDTLS_FOUND)
                     set(SSL_BACKEND_USED "MbedTLS")
                 else()
-                    message(FATAL_ERROR "No valid SSL backend found! Please install OpenSSL, Mbed TLS or disable SSL by setting CPR_ENABLE_SSL to OFF.")
+                    find_package(WolfSSL)
+                    if(WOLFSSL_FOUND)
+                        set(SSL_BACKEND_USED "WolfSSL")
+                    else()
+                        message(FATAL_ERROR "No valid SSL backend found! Please install OpenSSL, Mbed TLS or disable SSL by setting CPR_ENABLE_SSL to OFF.")
+                    endif()                
                 endif()
             endif()
         endif()
@@ -180,6 +186,10 @@ if(CPR_ENABLE_SSL)
             message(STATUS "Using Mbed TLS.")
             set(CPR_BUILD_TESTS_SSL OFF)
             set(SSL_BACKEND_USED "MbedTLS")
+        elseif(CPR_FORCE_WOLFSSL_BACKEND)
+            message(STATUS "Using WolfSSL.")
+            set(CPR_BUILD_TESTS_SSL OFF)
+            set(SSL_BACKEND_USED "WolfSSL")
         endif()
     endif()
 endif()
@@ -281,6 +291,10 @@ else()
             set(CURL_USE_MBEDTLS ON CACHE INTERNAL "" FORCE)
         endif()
 
+        if(SSL_BACKEND_USED STREQUAL "WolfSSL")
+            set(CURL_USE_WOLFSSL ON CACHE INTERNAL "" FORCE)
+        endif()
+
         message(STATUS "Enabled curl SSL")
     else()
         set(CURL_ENABLE_SSL OFF CACHE INTERNAL "" FORCE)