1 files changed, 15 insertions, 2 deletions

diff --git a/meta/classes-recipe/setuptools3.bbclass b/meta/classes-recipe/setuptools3.bbclass
index d71a089539..0adce5e2ec 100644
--- a/meta/classes-recipe/setuptools3.bbclass
+++ b/meta/classes-recipe/setuptools3.bbclass
@@ -12,13 +12,26 @@ SETUPTOOLS_BUILD_ARGS ?= ""
 
 SETUPTOOLS_SETUP_PATH ?= "${S}"
 
+python do_check_backend() {
+    import re
+    filename = d.expand("${SETUPTOOLS_SETUP_PATH}/pyproject.toml")
+    if os.path.exists(filename):
+        for line in open(filename):
+            match = re.match(r"build-backend\s*=\s*\W([\w.]+)\W", line)
+            if not match: continue
+
+            msg = f"inherits setuptools3 but has pyproject.toml with {match[1]}, use the correct class"
+            if "pep517-backend" not in (d.getVar("INSANE_SKIP") or "").split():
+                oe.qa.handle_error("pep517-backend", msg, d)
+}
+addtask check_backend after do_patch before do_configure
+
 setuptools3_do_configure() {
     :
 }
 
 setuptools3_do_compile() {
         cd ${SETUPTOOLS_SETUP_PATH}
-        NO_FETCH_BUILD=1 \
         STAGING_INCDIR=${STAGING_INCDIR} \
         STAGING_LIBDIR=${STAGING_LIBDIR} \
         ${STAGING_BINDIR_NATIVE}/python3-native/python3 setup.py \
@@ -35,4 +48,4 @@ setuptools3_do_install() {
 
 EXPORT_FUNCTIONS do_configure do_compile do_install
 
-export LDSHARED="${CCLD} -shared"
+export LDSHARED = "${CCLD} -shared"