inline-c-cpp: Clarify ghc >= 8.10 conditional on -optcxx=-std=c++11

fpco · Nov 23, 2020 · 3b9a0b8 · 3b9a0b8
1 parent dd6d45f
commit 3b9a0b8
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/inline-c-cpp/inline-c-cpp.cabal b/inline-c-cpp/inline-c-cpp.cabal
@@ -40,6 +40,13 @@ library
   -- cxx-options is for .cxx _file_ compilation whereas -optcxx is
   -- for TemplateHaskell, so we duplicate the options
   cxx-options:         -Wall -std=c++11
+  -- GHC < 8.10 do not provide proper means to set C++ options specifically.
+  -- On those versions you might be able to use -pgmc=clang++ instead.
+  -- This also means that we don't specify the C++ language version on GHC < 8.10,
+  -- which should be harmless because compilers strive to be ABI compatible
+  -- regardless of C++ language version (except perhaps experimental features).
+  -- By setting it to C++11 on GHC >= 8.10, we can expect incompatibilities to
+  -- be caught.
   if impl(ghc >= 8.10)
     ghc-options:       -optcxx=-Wall
                        -optcxx=-std=c++11