From ed11684ffef7ea9b517ed2586272173d54ca7af3 Mon Sep 17 00:00:00 2001
From: Sylvestre Ledru <sylvestre@debian.org>
Date: Fri, 29 Sep 2023 09:44:23 +0200
Subject: [PATCH] disable the doc on old distro

---
 debian/changelog |  1 +
 debian/rules     | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/debian/changelog b/debian/changelog
index 205c4946..e48c1959 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,6 +2,7 @@ llvm-toolchain-snapshot (1:18~++20230921012857+4cf8da94198d-1~exp1) UNRELEASED;
 
   * replace python3-recommonmark by myst-parser
     to follow upstream change b7ff03206d668cd5a620a9d4e1b22ea112ed56e3
+    And disable generation of the doc on old distro
 
  -- Sylvestre Ledru <sylvestre@debian.org>  Mon, 25 Sep 2023 21:51:52 +0200
 
diff --git a/debian/rules b/debian/rules
index 61667530..2210a83f 100755
--- a/debian/rules
+++ b/debian/rules
@@ -412,6 +412,13 @@ ifeq (,$(filter-out $(LIBCXX_WASM_DISABLE_DISTRO), $(DISTRO)))
   LIBCXX_WASM_ENABLE=no
 endif
 
+DOC_GENERATION=yes
+DOC_GENERATION_DISTRO := buster bullseye bionic focal
+# LLVM upstream moved to myst_parser but it isn't available on old distro
+ifeq (,$(filter-out $(DISABLE_DOC_GENERATION_DISTRO), $(DISTRO)))
+  DOC_GENERATION=no
+endif
+
 ifneq (,$(filter $(DEB_HOST_ARCH),powerpc powerpcspe))
   LIBCXX_WASM_ENABLE=no
 endif
@@ -967,6 +974,10 @@ override_dh_auto_build: \
 override_dh_prep: build_doc
 	dh_prep
 
+ifeq ($(DOC_GENERATION), no)
+build_doc:
+	@echo "Don't build doc on this distro $(DISTRO)"
+else
 build_doc:
 	BUILDDIR="_build"; \
 	ALLSPHINXOPTS="-d $$BUILDDIR/doctrees ."; \
@@ -1028,6 +1039,7 @@ endif
 		cd openmp/runtime/doc/doxygen/generated/html/ && rm jquery.js && ln -s /usr/share/javascript/jquery/jquery.js; \
 	fi
 	touch $@
+endif
 
 override_dh_auto_install:
 	# Clean up temporary files to make sure the install works