make doctest-cli fails on CPP #if

[philderbeast]

I'm documenting some makefile targets for #10596. I tried the doctest-cli target but it fails.

cabal/Makefile

Lines 134 to 137 in 4da153d

	# This is not run as part of validate.sh (we need hackage-security, which is tricky to get).
	.PHONY: doctest-cli
	doctest-cli :
	doctest -D__DOCTEST__ --fast cabal-install/src cabal-install-solver/src cabal-install-solver/src-assertion

$ make doctest-cli
doctest -D__DOCTEST__ --fast cabal-install/src cabal-install-solver/src cabal-install-solver/src-assertion

cabal-install/src/Distribution/Client/HashValue.hs:74:0: error:
     error: missing binary operator before token "("
       74 | #if MIN_VERSION_base16_bytestring(1,0,0)
   |
74 | #if MIN_VERSION_base16_bytestring(1,0,0)
   | ^

cabal-install/src/Distribution/Client/HttpUtils.hs:244:0: error:
     error: missing binary operator before token "("
      244 | #if MIN_VERSION_base16_bytestring(1,0,0)
    |
244 | #if MIN_VERSION_base16_bytestring(1,0,0)
    | ^

cabal-install/src/Distribution/Client/Compat/Tar.hs:7:0: error:
     error: missing binary operator before token "("
        7 | #if MIN_VERSION_tar(0,6,0)
  |
7 | #if MIN_VERSION_tar(0,6,0)
  | ^

cabal-install/src/Distribution/Client/Compat/Tar.hs:26:0: error:
     error: missing binary operator before token "("
       26 | #if MIN_VERSION_tar(0,6,0)
   |
26 | #if MIN_VERSION_tar(0,6,0)
   | ^

cabal-install/src/Distribution/Client/Compat/Tar.hs:54:0: error:
     error: missing binary operator before token "("
       54 | #if MIN_VERSION_tar(0,6,0)
   |
54 | #if MIN_VERSION_tar(0,6,0)
   | ^

cabal-install/src/Distribution/Client/Compat/Tar.hs:1:1: error:
    `gcc' failed in phase `C pre-processor'. (Exit code: 1)
  |
1 | {-# LANGUAGE CPP #-}
  | ^

cabal-install/src/Distribution/Client/HashValue.hs:1:1: error:
    `gcc' failed in phase `C pre-processor'. (Exit code: 1)
  |
1 | {-# LANGUAGE CPP #-}
  | ^

cabal-install/src/Distribution/Client/HttpUtils.hs:1:1: error:
    `gcc' failed in phase `C pre-processor'. (Exit code: 1)
  |
1 | {-# LANGUAGE BangPatterns #-}
  | ^
make: *** [Makefile:137: doctest-cli] Error 1