1 files changed, 103 insertions, 0 deletions
diff --git a/meta/classes/ccmake.bbclass b/meta/classes/ccmake.bbclass
new file mode 100644
index 0000000000..c5b4bf6260
--- /dev/null
+++ b/meta/classes/ccmake.bbclass
@@ -0,0 +1,103 @@
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+inherit terminal
+
+python do_ccmake() {
+    import shutil
+
+    # copy current config for diffing
+    config = os.path.join(d.getVar("B"), "CMakeCache.txt")
+    if os.path.exists(config):
+        shutil.copy(config, config + ".orig")
+
+    oe_terminal(d.expand("ccmake ${OECMAKE_GENERATOR_ARGS} ${OECMAKE_SOURCEPATH} -Wno-dev"),
+        d.getVar("PN") + " - ccmake", d)
+
+    if os.path.exists(config) and os.path.exists(config + ".orig"):
+        if bb.utils.md5_file(config) != bb.utils.md5_file(config + ".orig"):
+            # the cmake class uses cmake --build, which will by default
+            # regenerate configuration, simply mark the compile step as tainted
+            # to ensure it is re-run
+            bb.note("Configuration changed, recompile will be forced")
+            bb.build.write_taint('do_compile', d)
+
+}
+do_ccmake[depends] += "cmake-native:do_populate_sysroot"
+do_ccmake[nostamp] = "1"
+do_ccmake[dirs] = "${B}"
+addtask ccmake after do_configure
+
+def cmake_parse_config_cache(path):
+    with open(path, "r") as f:
+        for i in f:
+            i = i.rstrip("\n")
+            if len(i) == 0 or i.startswith("//") or i.startswith("#"):
+                continue # empty or comment
+            key, value = i.split("=", 1)
+            key, keytype = key.split(":")
+            if keytype in ["INTERNAL", "STATIC"]:
+                continue # skip internal and static config options
+            yield key, keytype, value
+
+def cmake_diff_config_vars(a, b):
+    removed, added = [], []
+
+    for ak, akt, av in a:
+        found = False
+        for bk, bkt, bv in b:
+            if bk == ak:
+                found = True
+                if bkt != akt or bv != av: # changed
+                    removed.append((ak, akt, av))
+                    added.append((bk, bkt, bv))
+                break
+        # remove any missing from b
+        if not found:
+            removed.append((ak, akt, av))
+
+    # add any missing from a
+    for bk, bkt, bv in b:
+        if not any(bk == ak for ak, akt, av in a):
+            added.append((bk, bkt, bv))
+
+    return removed, added
+
+python do_ccmake_diffconfig() {
+    import shutil
+    config = os.path.join(d.getVar("B"), "CMakeCache.txt")
+    if os.path.exists(config) and os.path.exists(config + ".orig"):
+        if bb.utils.md5_file(config) != bb.utils.md5_file(config + ".orig"):
+            # scan the changed options
+            old = list(cmake_parse_config_cache(config + ".orig"))
+            new = list(cmake_parse_config_cache(config))
+            _, added = cmake_diff_config_vars(old, new)
+
+            if len(added) != 0:
+                with open(d.expand("${WORKDIR}/configuration.inc"), "w") as f:
+                    f.write("EXTRA_OECMAKE += \" \\\n")
+                    for k, kt, v in added:
+                        escaped = v if " " not in v else "\"{0}\"".format(v)
+                        f.write("    -D{0}:{1}={2} \\\n".format(k, kt, escaped))
+                    f.write("    \"\n")
+                bb.plain("Configuration recipe fragment written to: {0}".format(d.expand("${WORKDIR}/configuration.inc")))
+
+                with open(d.expand("${WORKDIR}/site-file.cmake"), "w") as f:
+                    for k, kt, v in added:
+                        f.write("SET({0} \"{1}\" CACHE {2} \"\")\n".format(k, v, kt))
+                bb.plain("Configuration cmake fragment written to: {0}".format(d.expand("${WORKDIR}/site-file.cmake")))
+
+                # restore the original config
+                shutil.copy(config + ".orig", config)
+        else:
+            bb.plain("No configuration differences, skipping configuration fragment generation.")
+    else:
+        bb.fatal("No config files found. Did you run ccmake?")
+}
+do_ccmake_diffconfig[nostamp] = "1"
+do_ccmake_diffconfig[dirs] = "${B}"
+addtask ccmake_diffconfig
+