[project @ 2003-08-18 14:35:26 by panne]

AC_PROG_LEX really checks for the existence of "lex" when "flex" is
not found, so there is no need for AC_PROG_LEX_STRICT.

Furthermore, flex/lex is not really needed for building GHC, so we
issue only a warning instead of dying when flex and lex are not found.

diff --git a/aclocal.m4 b/aclocal.m4
index 16a36cf..9de8d1d 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1129,19 +1129,6 @@ dnl and we don't want to be global namespace polluters.
 
 # LocalWords:  fi
 
-dnl 
-dnl acspecific.m4's defn of AC_PROG_LEX is a bit too permissive, as it
-dnl defaults to 'lex' if 'flex' isn't found (without checking whether
-dnl 'lex' is actually present along the user's PATH).
-dnl
-AC_DEFUN(AC_PROG_LEX_STRICT,
-[AC_CHECK_PROG(LEX, flex, flex)
-if test -z "$LEX"
-then
-  AC_CHECK_PROG(LEX,lex,lex)
-  test -z "$LEX" && AC_MSG_ERROR(['lex' or 'flex' is required to compile GHC.])
-fi
-])
 
 dnl
 dnl Check to see whether CC (gcc) supports a particular option.

diff --git a/configure.ac b/configure.ac
index f4e7d6d..da94e91 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -656,10 +656,9 @@ FPTOOLS_PROG_DIFF
 dnl ** Find find command (for Win32's benefit)
 FPTOOLS_FIND_FIND
 
-dnl ** Find lex command (lex or flex) - *doesn't* use autoconf's
-dnl    AC_PROG_LEX, since it doesn't actually check whether 'lex'
-dnl    exists if 'flex' doesn't.
-AC_PROG_LEX_STRICT
+dnl ** Find lex command (flex or lex)
+AC_PROG_LEX
+test -z "$LEX" && AC_MSG_WARN(['flex' or 'lex' not found])
 
 dnl ** figure out how to do a BSD-ish install
 AC_PROG_INSTALL