[PATCH v2] build: Allow using system-provided md4c and tidy libraries.

[Maxim Cournoyer]

* CMakeLists.txt <md4c, tidy>: Search for libraries in the system
first, falling back to bundled copies in case they aren't found.

Fixes: <https://git.jami.net/savoirfairelinux/jami-client-qt/-/issues/1506>
---

Changes in v2:
 - Rebased on top of master

 CMakeLists.txt | 38 ++++++++++++++++++++++++++------------
 1 file changed, 26 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e802357f..6d2dccfb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -600,20 +600,34 @@ add_subdirectory(3rdparty/SortFilterProxyModel)
 set(SFPM_OBJECTS $<TARGET_OBJECTS:SortFilterProxyModel>)
 
 # md4c
-set(BUILD_MD2HTML_EXECUTABLE OFF CACHE BOOL "Don't build md2html executable" 
FORCE)
-set(BUILD_SHARED_LIBS OFF CACHE BOOL "Don't build shared md4c library" FORCE)
-add_subdirectory(3rdparty/md4c EXCLUDE_FROM_ALL)
-list(APPEND CLIENT_LINK_DIRS ${MD4C_BINARY_DIR}/src)
-list(APPEND CLIENT_INCLUDE_DIRS ${MD4C_SOURCE_DIR}/src)
-list(APPEND CLIENT_LIBS md4c-html)
+find_package(md4c)
+if(md4c_FOUND)
+  message(STATUS "Using system-provided md4c-html")
+  list(APPEND CLIENT_LIBS md4c::md4c-html)
+else()
+  message("Using bundled md4c-html library")
+  set(BUILD_MD2HTML_EXECUTABLE OFF CACHE BOOL "Don't build md2html executable" 
FORCE)
+  set(BUILD_SHARED_LIBS OFF CACHE BOOL "Don't build shared md4c library" FORCE)
+  add_subdirectory(3rdparty/md4c EXCLUDE_FROM_ALL)
+  list(APPEND CLIENT_LINK_DIRS ${MD4C_BINARY_DIR}/src)
+  list(APPEND CLIENT_INCLUDE_DIRS ${MD4C_SOURCE_DIR}/src)
+  list(APPEND CLIENT_LIBS md4c-html)
+endif()
 
 # tidy-html5
-set(BUILD_SHARED_LIB OFF CACHE BOOL "Don't build shared tidy library" FORCE)
-set(SUPPORT_CONSOLE_APP OFF CACHE BOOL "Don't build tidy console app" FORCE)
-add_subdirectory(3rdparty/tidy-html5 EXCLUDE_FROM_ALL)
-list(APPEND CLIENT_LINK_DIRS ${tidy_BINARY_DIR}/Release)
-list(APPEND CLIENT_INCLUDE_DIRS ${tidy_SOURCE_DIR}/include)
-list(APPEND CLIENT_LIBS tidy-static)
+pkg_check_modules(tidy IMPORTED_TARGET tidy)
+if(tidy_FOUND)
+  message(STATUS "Using system-provided tidy")
+  list(APPEND CLIENT_LIBS PkgConfig::tidy)
+else()
+  message("Using bundled tidy library")
+  set(BUILD_SHARED_LIB OFF CACHE BOOL "Don't build shared tidy library" FORCE)
+  set(SUPPORT_CONSOLE_APP OFF CACHE BOOL "Don't build tidy console app" FORCE)
+  add_subdirectory(3rdparty/tidy-html5 EXCLUDE_FROM_ALL)
+  list(APPEND CLIENT_LINK_DIRS ${tidy_BINARY_DIR}/Release)
+  list(APPEND CLIENT_INCLUDE_DIRS ${tidy_SOURCE_DIR}/include)
+  list(APPEND CLIENT_LIBS tidy-static)
+endif()
 
 # common executable sources
 qt_add_executable(

base-commit: b88627d125b7d217a46f76f62edf4852bcffa36b
-- 
2.41.0