niti FFI: support the pkgconfig annotation

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/src/interpreter/dynamic_loading_ffi/on_demand_compiler.nit b/src/interpreter/dynamic_loading_ffi/on_demand_compiler.nit
index 85deec6..f839d3a 100644 (file)
--- a/src/interpreter/dynamic_loading_ffi/on_demand_compiler.nit
+++ b/src/interpreter/dynamic_loading_ffi/on_demand_compiler.nit
@@ -20,6 +20,7 @@ import c_tools
 import nitni
 import ffi
 import naive_interpreter
+import pkgconfig
 
 redef class AMethPropdef
        # Does this method definition use the FFI and is it supported by the interpreter?
@@ -93,13 +94,29 @@ redef class AModule
                var srcs = [for file in ccu.files do new ExternCFile(file, ""): ExternFile]
                srcs.add_all mmodule.ffi_files
 
-               if mmodule.pkgconfigs.not_empty then
-                       fatal(v, "NOT YET IMPLEMENTED annotation `pkgconfig`")
-                       return false
-               end
-
+               # Compiler options specific to this module
                var ldflags = mmodule.ldflags[""].join(" ")
-               # TODO pkgconfig
+
+               # Protect pkg-config
+               var pkgconfigs = mmodule.pkgconfigs
+               var pkg_command = ""
+               if not pkgconfigs.is_empty then
+                       var cmd = "which pkg-config >/dev/null"
+                       if system(cmd) != 0 then
+                               v.fatal "FFI Error: Command `pkg-config` not found. Please install it"
+                               return false
+                       end
+
+                       for p in pkgconfigs do
+                               cmd = "pkg-config --exists '{p}'"
+                               if system(cmd) != 0 then
+                                       v.fatal "FFI Error: package {p} is not found by `pkg-config`. Please install it."
+                                       return false
+                               end
+                       end
+
+                       pkg_command = "`pkg-config --cflags --libs {pkgconfigs.join(" ")}`"
+               end
 
                # Compile each source file to an object file (or equivalent)
                var object_files = new Array[String]
@@ -108,9 +125,8 @@ redef class AModule
                end
 
                # Link everything in a shared library
-               # TODO customize the compiler
-               var cmd = "{v.c_compiler} -Wall -shared -o {foreign_code_lib_path} {object_files.join(" ")} {ldflags}"
-               if sys.system(cmd) != 0 then
+               var cmd = "{v.c_compiler} -Wall -shared -o {foreign_code_lib_path} {object_files.join(" ")} {ldflags} {pkg_command}"
+               if system(cmd) != 0 then
                        v.fatal "FFI Error: Failed to link native code using `{cmd}`"
                        return false
                end