meson.build: Check if Perl is required for building documentation

kjellahl · kjellahl · commit 40d769545feb · 2021-08-17T18:34:43.000+02:00
New versions of mm-common use the Python scripts doc_postprocess.py
and doc_install.py instead of the Perl scripts doc-postprocess.pl and
doc-install.pl when documentation is built.
diff --git a/meson.build b/meson.build
@@ -114,7 +114,6 @@ if maintainer_mode and not mm_common_get.found()
   mm_common_get = find_program('mm-common-get', required: true)
 endif
 m4 = find_program('m4', required: maintainer_mode) # For building C++ code
-perl = find_program('perl', required: build_documentation)
 doxygen = find_program('doxygen', required: build_documentation)
 dot = find_program('dot', required: build_documentation) # Used by Doxygen
 xsltproc = find_program('xsltproc', required: build_documentation)
@@ -141,6 +140,17 @@ sys.exit(os.path.isfile("@0@"))
   endif
 endif
 
+# Check if perl is required and available.
+# Done now, when the doc_reference script is available.
+doc_perl_prop = run_command(
+  python3, doc_reference, 'get_script_property',
+  '', # MMDOCTOOLDIR is not used
+  'requires_perl')
+if not (doc_perl_prop.returncode() == 0 and doc_perl_prop.stdout() == 'false')
+  # Perl is required, if documentation shall be built.
+  perl = find_program('perl', required: build_documentation)
+endif
+
 # Set compiler warnings.
 warning_flags = []
 if warning_level == 'min'
diff --git a/untracked/README b/untracked/README
@@ -15,10 +15,10 @@ or the tarball is created with Meson.
 
 1. Files copied by mm-common-get
 --------------------------------
-untracked/docs/docs/doc-install.pl
-                    doc-postprocess.pl
-                    doxygen-extra.css
-                    tagfile-to-devhelp2.xsl
+untracked/docs/doc_install.py or doc-install.pl
+               doc_postprocess.py or doc-postprocess.pl
+               doxygen-extra.css
+               tagfile-to-devhelp2.xsl
 untracked/build_scripts/dist-build-scripts.py
                         dist-changelog.py
                         doc-reference.py
