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authorBen Gamari <ben@smart-cactus.org>2019-09-18 23:50:20 -0400
committerMarge Bot <ben+marge-bot@smart-cactus.org>2019-09-27 22:11:53 -0400
commit144abba394c6a23eb877fbde727111a5e75b9d47 (patch)
treeeaa127bd712a7cac72f9375671476e2a0547964d /aclocal.m4
parent9c02a793be61a66bc091729f50e567096ab74a5c (diff)
downloadhaskell-144abba394c6a23eb877fbde727111a5e75b9d47.tar.gz
configure: Don't depend upon alex in source dist build
This fixes #16860 by verifying that the generated sources don't already exist before asserting that the `alex` executable was found. This replicates the logic already used for `happy` in the case of `alex`.
Diffstat (limited to 'aclocal.m4')
-rw-r--r--aclocal.m47
1 files changed, 5 insertions, 2 deletions
diff --git a/aclocal.m4 b/aclocal.m4
index 4729a1ca16..6b96a7c084 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -984,8 +984,11 @@ else
fi;
changequote([, ])dnl
])
-FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[3.1.7],
- [AC_MSG_ERROR([Alex version 3.1.7 or later is required to compile GHC.])])[]
+if test ! -f compiler/parser/Lexer.hs
+then
+ FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[3.1.7],
+ [AC_MSG_ERROR([Alex version 3.1.7 or later is required to compile GHC.])])[]
+fi
AlexVersion=$fptools_cv_alex_version;
AC_SUBST(AlexVersion)
])