[SCons] Fix caching and path detection.

Add version file depenencies to SSL and RTC targets.

Disable OpenSSL caching since it causes issues as it doesn't properly
cache generated header files.

Add hack to prepend PATH and few other vars (should probably be added
to upstream godot-cpp), and clone scons envs when building ssl/rtc (so
that PATHs are properly setup).

SConstruct

@@ -79,6 +79,15 @@ else:
     ARGUMENTS["ios_min_version"] = "11.0"
     env = SConscript("godot-cpp/SConstruct").Clone()
 
+# Should probably go to upstream godot-cpp.
+# We let SCons build its default ENV as it includes OS-specific things which we don't
+# want to have to pull in manually.
+# Then we prepend PATH to make it take precedence, while preserving SCons' own entries.
+env.PrependENVPath("PATH", os.getenv("PATH"))
+env.PrependENVPath("PKG_CONFIG_PATH", os.getenv("PKG_CONFIG_PATH"))
+if "TERM" in os.environ: # Used for colored output.
+    env["ENV"]["TERM"] = os.environ["TERM"]
+
 # Patch mingw SHLIBSUFFIX.
 if env["platform"] == "windows" and env["use_mingw"]:
     env["SHLIBSUFFIX"] = ".dll"
@@ -100,19 +109,20 @@ env.Append(BUILDERS={
 
 # SSL
 ssl = env.BuildOpenSSL(env.Dir(builders.get_ssl_build_dir(env)), env.Dir(builders.get_ssl_source_dir(env)))
-env.Depends(ssl, env.File("builders.py"))
+env.Depends(ssl, [env.File("builders.py"), env.File(builders.get_ssl_source_dir(env) + "/VERSION.dat")])
+env.NoCache(ssl) # Needs refactoring to properly cache generated headers.
 
 env.Prepend(CPPPATH=[builders.get_ssl_include_dir(env)])
 env.Prepend(LIBPATH=[builders.get_ssl_build_dir(env)])
-env.Append(LIBS=[ssl])
+env.Append(LIBS=[builders.get_ssl_libs(env)])
 
 # RTC
 rtc = env.BuildLibDataChannel(env.Dir(builders.get_rtc_build_dir(env)), [env.Dir(builders.get_rtc_source_dir(env))] + ssl)
-env.Depends(rtc, env.File("builders.py"))
+env.Depends(rtc, [env.File("builders.py"), env.File(builders.get_rtc_source_dir(env) + "/CMakeLists.txt")])
 
 env.Append(LIBPATH=[builders.get_rtc_build_dir(env)])
 env.Append(CPPPATH=[builders.get_rtc_include_dir(env)])
-env.Prepend(LIBS=[rtc])
+env.Prepend(LIBS=[builders.get_rtc_libs(env)])
 
 # Our includes and sources
 env.Append(CPPPATH=["src/"])
@@ -130,7 +140,7 @@ else:
     sources.append("src/init_gdnative.cpp")
     add_sources(sources, "src/net/", "cpp")
 
-env.Depends(sources, [ssl, rtc])
+env.Depends(sources, [builders.get_ssl_libs(env), builders.get_rtc_libs(env)])
 
 # Make the shared library
 result_name = "webrtc_native{}{}".format(env["suffix"], env["SHLIBSUFFIX"])

builders.py

@@ -1,4 +1,5 @@
 import os
+from SCons.Defaults import Mkdir
 from SCons.Script import Environment
 
 
@@ -26,6 +27,17 @@ def get_rtc_include_dir(env):
     return get_rtc_source_dir(env) + "/include"
 
 
+def get_rtc_libs(env):
+    bdir = get_rtc_build_dir(env)
+    libs = [
+        "libdatachannel-static.a",
+        "deps/libjuice/libjuice-static.a",
+        "deps/libsrtp/libsrtp2.a",
+        "deps/usrsctp/usrsctplib/libusrsctp.a"
+    ]
+    return [env.File(bdir + "/" + lib) for lib in libs]
+
+
 def get_ssl_source_dir(env):
     return get_deps_dir(env) + "/openssl"
 
@@ -42,19 +54,20 @@ def get_ssl_include_dir(env):
     return get_ssl_install_dir(env) + "/include"
 
 
+def get_ssl_libs(env):
+    bdir = get_ssl_build_dir(env)
+    return [env.File(bdir + "/" + lib) for lib in ["libssl.a", "libcrypto.a"]]
+
+
 def ssl_emitter(target, source, env):
-    build_dir = get_ssl_build_dir(env)
-    libs = ["libssl.a", "libcrypto.a"]
-    install_dir = get_ssl_install_dir(env)
-    ssl_include = os.path.join(source[0].abspath, "include")
-    return [env.File(build_dir + "/" + l) for l in libs], source
+    return get_ssl_libs(env), source
 
 
 def ssl_action(target, source, env):
     build_dir = get_ssl_build_dir(env)
     source_dir = source[0].abspath
 
-    ssl_env = Environment()
+    ssl_env = env.Clone()
     install_dir = get_ssl_install_dir(env)
     args = [
         "no-ssl3",
@@ -126,8 +139,8 @@ def ssl_action(target, source, env):
 
     jobs = env.GetOption("num_jobs")
     ssl_env.Execute([
-            "mkdir -p " + build_dir, # TODO python?
-            ("cd %s && %s/Configure " % (build_dir, source_dir)) + " ".join(args),
+            Mkdir(build_dir),
+            "cd %s && perl %s/Configure %s" % (build_dir, source_dir, " ".join(['"%s"' % a for a in args])),
             "make -C %s -j%s" % (build_dir, jobs),
             "make -C %s install_sw install_ssldirs -j%s" % (build_dir, jobs),
         ]
@@ -136,28 +149,20 @@ def ssl_action(target, source, env):
 
 
 def rtc_emitter(target, source, env):
-    build_dir = get_rtc_build_dir(env)
-    libs = ["libdatachannel-static.a", "libjuice-static.a", "libsrtp2.a", "libusrsctp.a"]
-    lib_paths = [
-        build_dir,
-        os.path.join(build_dir, "deps/libjuice"),
-        os.path.join(build_dir, "deps/libsrtp"),
-        os.path.join(build_dir, "deps/usrsctp/usrsctplib"),
-    ]
-    return [env.File(lib_paths[i] + "/" + libs[i]) for i in range(len(libs))], source
+    return get_rtc_libs(env), source
 
 
 def rtc_action(target, source, env):
     build_dir = get_rtc_build_dir(env)
     source_dir = source[0].abspath
     args = [
+        "cmake",
         "-B",
         build_dir,
         "-DUSE_NICE=0",
         "-DNO_WEBSOCKET=1",
         #"-DNO_MEDIA=1", # Windows builds fail without it.
         "-DNO_EXAMPLES=1",
-        "-DNO_WEBSOCKET=1",
         "-DNO_TESTS=1",
         "-DOPENSSL_USE_STATIC_LIBS=1",
         "-DOPENSSL_INCLUDE_DIR=%s" % get_ssl_include_dir(env),
@@ -215,7 +220,8 @@ def rtc_action(target, source, env):
         if env["arch"] == "x86_32":
             if env["use_mingw"]:
                 args.extend([
-                    "-G 'Unix Makefiles'",
+                    "-G",
+                    "Unix Makefiles",
                     "-DCMAKE_C_COMPILER=i686-w64-mingw32-gcc",
                     "-DCMAKE_CXX_COMPILER=i686-w64-mingw32-g++",
                     "-DCMAKE_SYSTEM_NAME=Windows",
@@ -223,7 +229,8 @@ def rtc_action(target, source, env):
         else:
             if env["use_mingw"]:
                 args.extend([
-                    "-G 'Unix Makefiles'",
+                    "-G",
+                    "Unix Makefiles",
                     "-DCMAKE_C_COMPILER=x86_64-w64-mingw32-gcc",
                     "-DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-g++",
                     "-DCMAKE_SYSTEM_NAME=Windows"
@@ -231,10 +238,10 @@ def rtc_action(target, source, env):
 
     args.append(source_dir)
     jobs = env.GetOption("num_jobs")
-    rtc_env = Environment()
+    rtc_env = env.Clone()
     rtc_env.Execute([
-            "cmake " + " ".join(args),
-            "cmake --build %s -t datachannel-static -j%s" % (build_dir, jobs),
+            " ".join(['"%s"' % a for a in args]),
+            "cmake --build %s -t datachannel-static -j%s" % (build_dir, jobs)
         ]
     )
     return None