Some patches against build-script

Hi Jon,

This small patch series contain 3 minor fixes/cleanups for sphinx-build-wrapper addressing some corner usecases.

Patch 1 was already submitted. It avoids 2 harmless warnings when texlive is not installed.

Patch 2 fixes the checker for latexmk (PDFLATEX env) when texlive is not installed.

Patch 3 restores the logic to store *.pyc files under builddir instead of sourcedir.

Mauro Carvalho Chehab (3):
docs: Makefile: avoid a warning when using without texlive tools/docs: sphinx-build-wrapper: pdflatex is needed only for pdf
docs: Makefile: use PYTHONPYCACHEPREFIX

 Documentation/Makefile          | 19 ++++++++-----------
 tools/docs/sphinx-build-wrapper |  2 +-
 2 files changed, 9 insertions(+), 12 deletions(-)

2.51.0

As reported by Randy, running make htmldocs on a machine without textlive now produce warnings:

    $ make O=DOCS htmldocs
    ../Documentation/Makefile:70: warning: overriding recipe for target 'pdfdocs'
    ../Documentation/Makefile:61: warning: ignoring old recipe for target 'pdfdocs'

That's because the code has now two definitions for pdfdocs in case $PDFLATEX command is not found. With the new script, such special case is not needed anymore, as the script checks it.

Drop the special case. Even after dropping it, on a machine without LaTeX, it will still produce an error as expected, as running:

    $ ./tools/docs/sphinx-build-wrapper pdfdocs
    Error: pdflatex or latexmk required for PDF generation

does the check. After applying the patch we have:

    $ make SPHINXDIRS=peci htmldocs
    Using alabaster theme
    Using Python kernel-doc

    $ make SPHINXDIRS=peci pdfdocs
    Error: pdflatex or latexmk required for PDF generation
    make[2]: *** [Documentation/Makefile:64: pdfdocs] Error 1
    make[1]: *** [/root/Makefile:1808: pdfdocs] Error 2
    make: *** [Makefile:248: __sub-make] Error 2

Which is the expected behavior.

---
 Documentation/Makefile | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

index c60db1038c9c..f764604fa1ac 100644
@@ -66,20 +66,15 @@ htmldocs mandocs infodocs texinfodocs latexdocs epubdocs xmldocs pdfdocs linkche
 		--builddir="$(BUILDDIR)" --deny-vf=$(FONTS_CONF_DENY_VF) \
 		--theme=$(DOCS_THEME) --css=$(DOCS_CSS) --paper=$(PAPER)
 
-# Special handling for pdfdocs
-ifneq ($(shell which $(PDFLATEX) >/dev/null 2>&1; echo $$?),0)
-pdfdocs:
-	$(warning The '$(PDFLATEX)' command was not found. Make sure you have it installed and in PATH to produce PDF output.)
-	@echo "  SKIP    Sphinx $@ target."
-endif
 
-htmldocs-redirects: $(srctree)/Documentation/.renames.txt
-	@tools/docs/gen-redirects.py --output $(BUILDDIR) < $<
-endif # HAVE_SPHINX
+endif
 
 # The following targets are independent of HAVE_SPHINX, and the rules should
 # work or silently pass without Sphinx.
 
+htmldocs-redirects: $(srctree)/Documentation/.renames.txt
+	@tools/docs/gen-redirects.py --output $(BUILDDIR) < $<
+
 refcheckdocs:
 	$(Q)cd $(srctree);scripts/documentation-file-ref-check
 

2.51.0

Fix the logic which checks for pdflatex. Currently, it complains for both pdfdocs and latexdocs, but for the latter, all it is needed is Sphinx.

---
 tools/docs/sphinx-build-wrapper | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index cce985dced00..a74998e8309a 100755
@@ -650,7 +650,7 @@ class SphinxBuilder:
             if not sphinxbuild and target != "mandocs":
                 sys.exit(f"Error: {self.sphinxbuild} not found in PATH.\n")
 
-        if builder == "latex":
+        if target == "pdfdocs":
             if not self.pdflatex_cmd and not self.latexmk_cmd:
                 sys.exit("Error: pdflatex or latexmk required for PDF generation")
 

2.51.0

Previous cleanup patches ended dropping it when sphinx-build-wrapper were added. Also, sphinx-pre-install can also generate caches.

So, re-add it for both.

---
 Documentation/Makefile | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

index f764604fa1ac..65d184eab739 100644
@@ -60,8 +60,10 @@ else # HAVE_SPHINX
 
 # Common documentation targets
 htmldocs mandocs infodocs texinfodocs latexdocs epubdocs xmldocs pdfdocs linkcheckdocs:
-	$(Q)@$(srctree)/tools/docs/sphinx-pre-install --version-check
-	+$(Q)$(PYTHON3) $(BUILD_WRAPPER) $@ \
+	$(Q)PYTHONPYCACHEPREFIX="$(PYTHONPYCACHEPREFIX)" \
+		$(srctree)/tools/docs/sphinx-pre-install --version-check
+	+$(Q)PYTHONPYCACHEPREFIX="$(PYTHONPYCACHEPREFIX)" \
+		$(PYTHON3) $(BUILD_WRAPPER) $@ \
 		--sphinxdirs="$(SPHINXDIRS)" $(RUSTDOC) \
 		--builddir="$(BUILDDIR)" --deny-vf=$(FONTS_CONF_DENY_VF) \
 		--theme=$(DOCS_THEME) --css=$(DOCS_CSS) --paper=$(PAPER)

2.51.0

Applied to the build-script branch, thanks.

jon