[libc-commits] [libc] [libc][docgen] regen docgen via cmake (PR #119628)

[Nick Desaulniers via libc-commits]

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@@ -4,6 +4,33 @@ include(AddSphinxTarget)
 if (SPHINX_FOUND)
   if (${SPHINX_OUTPUT_HTML})
     add_sphinx_target(html libc)
+
+    list(APPEND docgen_list
+      assert
+      ctype
+      errno
+      fenv
+      float
+      inttypes
+      locale
+      setjmp
+      signal
+      stdbit
+      stdlib
+      string
+      strings
+      threads
+      uchar
+      wchar
+      wctype
+    )
+
+    foreach(stem IN LISTS docgen_list)
+      add_custom_target(${stem}_rst
+        COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/../utils/docgen/docgen.py ${stem}.h >
+                ${CMAKE_CURRENT_SOURCE_DIR}/headers/${stem}.rst)
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nickdesaulniers wrote:

So there's probably a better way to do this.  IIUC, it's going to run the command every time, which isn't necessary.  We should only need to re-run the command in the input file (`libc/utils/docgen/{stem}.json`) is modified.  Not sure yet how to express that in cmake...

https://github.com/llvm/llvm-project/pull/119628