[Git][ghc/ghc][master] configure: Drop unused AC_PROG_CPP

[Marge Bot (@marge-bot)]

Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC


Commits:
d986c98e by Rodrigo Mesquita at 2023-05-16T00:14:04-04:00
configure: Drop unused AC_PROG_CPP

In configure, we were calling `AC_PROG_CPP` but never making use of the
$CPP variable it sets or reads.

The issue is $CPP will show up in the --help output of configure,
falsely advertising a configuration option that does nothing.

The reason we don't use the $CPP variable is because HS_CPP_CMD is
expected to be a single command (without flags), but AC_PROG_CPP, when
CPP is unset, will set said variable to something like `/usr/bin/gcc -E`.
Instead, we configure HS_CPP_CMD through $CC.

- - - - -


1 changed file:

- configure.ac


Changes:

=====================================
configure.ac
=====================================
@@ -465,9 +465,6 @@ MAYBE_OVERRIDE_STAGE0([ar],[AR_STAGE0])
 dnl make extensions visible to allow feature-tests to detect them lateron
 AC_USE_SYSTEM_EXTENSIONS
 
-dnl ** figure out how to invoke the C preprocessor (i.e. `gcc -E`)
-AC_PROG_CPP
-
 # --with-hs-cpp/--with-hs-cpp-flags
 FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
 AC_SUBST([HaskellCPPCmd])



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d986c98e471e21aee0129e1fe1a7ba3059069256

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d986c98e471e21aee0129e1fe1a7ba3059069256
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