cmake: use pkg_check_modules() for cURL

The cURL project has provided a pkg-config file for well over a decade
now. Just use that instead of the cmake one, since the latter also
checks for misc curl components, unusual library names (libcurl_imp)
which is not something we need.

In addition, this will make enforcing minimum version much easier.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

CMakeLists.txt

@@ -239,7 +239,9 @@ if(ICONV_FOUND)
 endif()
 
 # Check for CURL
-find_package(CURL REQUIRED)
+pkg_check_modules(LIBCURL REQUIRED libcurl)
+include_directories(${LIBCURL_INCLUDE_DIRS})
+list(APPEND EXTRA_LIBS ${LIBCURL_LDFLAGS})
 
 find_library(DL_LIBRARY
   NAMES dl

src/core/CMakeLists.txt

@@ -89,8 +89,6 @@ endif()
 
 include_directories(${GNUTLS_INCLUDE_PATH})
 
-include_directories(${CURL_INCLUDE_DIRS})
-
 if(ENABLE_ZSTD)
   include_directories(${LIBZSTD_INCLUDE_DIRS})
 endif()

src/gui/curses/CMakeLists.txt

@@ -45,8 +45,6 @@ endif()
 
 list(APPEND EXTRA_LIBS "m")
 
-list(APPEND EXTRA_LIBS ${CURL_LIBRARIES})
-
 list(APPEND EXTRA_LIBS ${ZLIB_LIBRARY})
 
 if(ENABLE_ZSTD)

tests/CMakeLists.txt

@@ -228,7 +228,6 @@ target_link_libraries(tests
   weechat_ncurses_fake
   weechat_unit_tests_core
   ${EXTRA_LIBS}
-  ${CURL_LIBRARIES}
   ${ZLIB_LIBRARY}
   ${LIBZSTD_LDFLAGS}
   ${CPPUTEST_LIBRARIES}