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Diffstat (limited to 'm4/fptools_alex.m4')
| -rw-r--r-- | m4/fptools_alex.m4 | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/m4/fptools_alex.m4 b/m4/fptools_alex.m4 new file mode 100644 index 0000000000..527ee1e187 --- /dev/null +++ b/m4/fptools_alex.m4 @@ -0,0 +1,33 @@ +dnl +dnl Check for Alex and version. +dnl +dnl 1. Use alex specified in env var ALEX +dnl 2. Find alex in path +dnl 3. Check alex version +dnl +dnl If you increase the minimum version requirement, please also update: +dnl https://gitlab.haskell.org/ghc/ghc/wikis/building/preparation/tools +dnl +AC_DEFUN([FPTOOLS_ALEX], +[AC_PATH_PROG(ALEX,[alex],) +AC_SUBST(AlexCmd,$ALEX) +AC_CACHE_CHECK([for version of alex], fptools_cv_alex_version, +changequote(, )dnl +[if test x"$AlexCmd" != x; then + fptools_cv_alex_version=`"$AlexCmd" -v | + grep 'Alex [Vv]ersion' | sed -e 's/Alex [Vv]ersion \([0-9\.]*\).*/\1/g'` ; +else + fptools_cv_alex_version=""; +fi; +changequote([, ])dnl +]) +if test ! -f compiler/GHC/Parser/Lexer.hs || test ! -f compiler/GHC/Cmm/Lexer.hs +then + FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[3.2.6], + [AC_MSG_ERROR([Alex >= 3.2.6 && < 4 is required to compile GHC.])])[] + FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-ge],[4.0.0], + [AC_MSG_ERROR([Alex >= 3.2.6 && < 4 is required to compile GHC.])])[] +fi +AlexVersion=$fptools_cv_alex_version; +AC_SUBST(AlexVersion) +]) |