New target 'make sagelib-sdistcheck'

Author: Matthias Koeppe

build/make/deps

@@ -23,7 +23,7 @@ STARTED = $(SAGE_LOCAL)/etc/sage-started.txt
 # Tell make not to look for files with these names:
 .PHONY: all all-sage all-toolchain all-build all-sageruntime \
 	all-start build-start base toolchain toolchain-deps base-toolchain \
-	sagelib \
+	sagelib sagelib-sdistcheck \
 	doc doc-html doc-html-jsmath doc-html-mathjax doc-pdf \
 	doc-clean doc-src-clean doc-output-clean \
 	clean sagelib-clean build-clean python3_venv _clean-broken-gcc
@@ -204,6 +204,8 @@ sagelib: sagelib-build-deps
 		sage-logger -p 'time $(MAKE) sage' '$(SAGE_LOGS)/sagelib-$(SAGE_VERSION).log'; \
 	fi
 
+sagelib-sdistcheck:
+	cd $(SAGE_SRC) && source bin/sage-env && $(MAKE) sdistcheck
 
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 # Building scripts