Adds curl to the list of system libraries

Fixes macOS build with system libcurl

CMAKE_OPTIONS.md

@@ -33,4 +33,5 @@
 | audacity_use_vorbis               | STRING | local      | Use vorbis library [system (if available), local, off]          |
 | audacity_use_vst                  | BOOL   | ON         | Use VST2 plug-in support [on, off]                              |
 | audacity_use_wxwidgets            | STRING | local      | Use wxwidgets library [system (if available), local, off]       |
-| audacity_use_zlib                 | STRING | system     | Use zlib library [system (if available), local, off]            |
+| audacity_use_zlib                 | STRING | local      | Use zlib library [system (if available), local, off]            |
+| audacity_use_curl                 | STRING | local      | Use curl library [system (if available), local]                 |

cmake-proxies/CMakeLists.txt

@@ -111,8 +111,7 @@ add_conan_lib(
    OPTION_NAME curl
    PKG_CONFIG "libcurl >= 7.68.0"
    INTERFACE_NAME CURL::libcurl
-   FIND_PACKAGE_OPTIONS 
-      COMPONENTS HTTP HTTPS SSL
+   FIND_PACKAGE_OPTIONS
    CONAN_OPTIONS
       libcurl:with_ssl=${curl_ssl}
       libcurl:shared=True

cmake-proxies/cmake-modules/dependencies/curl.cmake

@@ -0,0 +1,30 @@
+if( ${_OPT}use_curl STREQUAL "system" )
+    # On macOS - CURL::libcurl is not defined by FindCURL for some reason
+
+    if(NOT TARGET CURL::libcurl)
+        add_library(CURL::libcurl UNKNOWN IMPORTED)
+        set_target_properties(CURL::libcurl PROPERTIES
+        INTERFACE_INCLUDE_DIRECTORIES "${CURL_INCLUDE_DIRS}")
+
+        if(EXISTS "${CURL_LIBRARY}")
+            set_target_properties(CURL::libcurl PROPERTIES
+                IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+                IMPORTED_LOCATION "${CURL_LIBRARY}")
+        endif()
+
+        if(CURL_LIBRARY_RELEASE)
+            set_property(TARGET CURL::libcurl APPEND PROPERTY
+                IMPORTED_CONFIGURATIONS RELEASE)
+            set_target_properties(CURL::libcurl PROPERTIES
+                IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+                IMPORTED_LOCATION_RELEASE "${CURL_LIBRARY_RELEASE}")
+        endif()
+        if(CURL_LIBRARY_DEBUG)
+            set_property(TARGET CURL::libcurl APPEND PROPERTY
+                IMPORTED_CONFIGURATIONS DEBUG)
+            set_target_properties(CURL::libcurl PROPERTIES
+                IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+                IMPORTED_LOCATION_DEBUG "${CURL_LIBRARY_DEBUG}")
+        endif()
+    endif()
+endif()

linux/build-environment/entrypoint.sh

@@ -38,6 +38,7 @@ cmake_options=(
     -Daudacity_use_sbsms=local # We prefer using the latest version of sbsms
     -Daudacity_use_soundtouch=system
     -Daudacity_use_twolame=system
+    -Daudacity_use_curl=system
 )
 
 cmake "${cmake_options[@]}" ../audacity