Merge pull request #14 from rakuco/optionally-link-against-libperl

bindings: perl: Add an option to explicitly link against libperl.so.

INSTALL

@@ -84,6 +84,11 @@ PERL_VENDORINSTALL:     Default to OFF. Tells cmake to install the perl binding
                         in the vendor directory, which is the one used by most
                         packagers.
 
+PERL_LINK_LIBPERL:      Default to ON if PERL_VENDORINSTALL is OFF, default to
+                        OFF otherwise. Explicitly links the Perl binding
+                        against libperl.so. It must be ON for linking to work
+                        when --no-undefined is passed to the linker.
+
 WITH_DOTNET:            Default to OFF. Enable Mono .NET bindings.
 
 WITH_GNOME:             Default to ON. Enable Gnome2/GConf bindings.

bindings/perl/CMakeLists.txt

@@ -10,6 +10,19 @@ if(PERL_FOUND AND PERLLIBS_FOUND)
     # Some distributions install perl packages in vendor when shipped with the distro.
     # Let's make their lifes easier by offering an install flag for this usecase.
     option(PERL_VENDORINSTALL "Install Perl package in vendor directory" OFF)
+
+    # Offer an option to explicitly link against libperl.so, with a default
+    # that depends on the value of the PERL_VENDORINSTALL option: if the
+    # binding is installed into a version-independent directory such as
+    # vendor_perl the chances of it needing a rebuild on each Perl update are
+    # lower. Note: not linking against libperl.so does not work if
+    # --no-undefined is passed to the linker.
+    if(PERL_VENDORINSTALL)
+        option(PERL_LINK_LIBPERL "Explicitly link against libperl.so" OFF)
+    else()
+        option(PERL_LINK_LIBPERL "Explicitly link against libperl.so" ON)
+    endif()
+
     if(PERL_VENDORINSTALL)
       set (PX_PERL_ARCH ${PERL_VENDORARCH})
       set (PX_PERL_LIB ${PERL_VENDORLIB})

bindings/perl/src/CMakeLists.txt

@@ -12,7 +12,12 @@ set(Libproxy_LIB_SRCS Libproxy.c)
 set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR}/perl/blib/arch/auto/Net)
 add_library(PLlibproxy SHARED ${Libproxy_LIB_SRCS})
 
-target_link_libraries(PLlibproxy libproxy pthread)
+set(PLlibproxy_LIB_DEPENDENCIES libproxy pthread)
+if(PERL_LINK_LIBPERL)
+  set(PLlibproxy_LIB_DEPENDENCIES ${PERL_LIBRARY} ${PLlibproxy_LIB_DEPENDENCIES})
+endif()
+
+target_link_libraries(PLlibproxy ${PLlibproxy_LIB_DEPENDENCIES})
 set_target_properties(PLlibproxy PROPERTIES OUTPUT_NAME "Libproxy")
 set_target_properties(PLlibproxy PROPERTIES PREFIX "")