[flang-commits] [flang] [flang] Use precompiled parsing headers (PR #130600)

[David Truby via flang-commits]

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@@ -72,3 +72,11 @@ add_flang_library(flangFrontend
   clangBasic
   clangDriver
 )
+
+target_precompile_headers(flangFrontend PRIVATE
+  [["flang/Parser/parsing.h"]]
+  [["flang/Parser/parse-tree.h"]]
+  [["flang/Parser/dump-parse-tree.h"]]
+  [["flang/Lower/PFTBuilder.h"]]
+  [["flang/Lower/Bridge.h"]]
+)
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DavidTruby wrote:

That's generally what you would do, since the set of precompiled headers you want is probably different for each target (even if there is some overlap). This does lead to _some_ duplication of work, but certainly no more than there is now where we are compiling these headers not only in every target, but in every _TU_!

https://github.com/llvm/llvm-project/pull/130600