[project @ 2003-08-13 12:34:04 by simonmar]

Detect Alex, and add --use-src-tree-alex option to configure.

aclocal.m4

-dnl $Id: aclocal.m4,v 1.121 2003/07/30 09:21:12 wolfgang Exp $
+dnl $Id: aclocal.m4,v 1.122 2003/08/13 12:34:04 simonmar Exp $
 dnl 
 dnl Extra autoconf macros for the Glasgow fptools
 dnl
@@ -264,6 +264,41 @@ dnl through that to find the version number, but I think we'll make
 dnl do without it for now.
 ])
 
+dnl
+dnl Check for Alex and version.  If we're building GHC, then we need
+dnl at least Alex version 2.0.  If there's no installed Alex, we look
+dnl for a alex source tree and point the build system at that instead.
+dnl
+AC_DEFUN(FPTOOLS_ALEX,
+[
+if test -d $srcdir/alex; then
+   SrcTreeAlexCmd=$hardtop/alex/src/alex-inplace
+fi
+if test x"$UseSrcTreeAlex" = xYES; then
+  AlexCmd=$SrcTreeAlexCmd
+else
+  AC_PATH_PROG(AlexCmd,alex,$SrcTreeAlexCmd)
+fi
+AC_CACHE_CHECK([for version of alex], fptools_cv_alex_version,
+changequote(, )dnl
+[if test x"$AlexCmd" = x"$SrcTreeAlexCmd"; then
+   fptools_cv_alex_version=`grep '^ProjectVersion[ 	]*=' $srcdir/alex/mk/version.mk | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`;
+elif test x"$AlexCmd" != x; then
+   fptools_cv_alex_version="`$AlexCmd -v |
+			  grep 'Alex Version' | sed -e 's/Alex Version \([^ ]*\).*/\1/g'`" ;
+else
+   fptools_cv_alex_version="";
+fi;
+changequote([, ])dnl
+])
+if test -d $srcdir/ghc -a ! -f $srcdir/ghc/compiler/parser/Lexer.hs; then
+  FPTOOLS_PROG_CHECK_VERSION([$fptools_cv_alex_version],-lt,[2.0],
+  [AC_MSG_ERROR([Alex version 2.0 or later is required to compile GHC.])])dnl
+fi
+AlexVersion=$fptools_cv_alex_version;
+AC_SUBST(AlexVersion)
+])
+
 dnl
 dnl What's the best way of doing context diffs?
 dnl

configure.in

@@ -731,7 +731,7 @@ FPTOOLS_GREENCARD(3.00)
 
 AC_ARG_ENABLE(src-tree-happy,
 [  --enable-src-tree-happy
-        Build and use source tree (fptools/happy) version of happy.
+        Build and use source tree (fptools/happy) version of Happy.
 ],
 [UseSrcTreeHappy=YES],
 [UseSrcTreeHappy=NO]
@@ -744,7 +744,7 @@ fi;
 
 AC_ARG_ENABLE(src-tree-haddock,
 [  --enable-src-tree-haddock
-        Build and use source tree (fptools/haddock) version of haddock.
+        Build and use source tree (fptools/haddock) version of Haddock.
 ],
 [UseSrcTreeHaddock=YES],
 [UseSrcTreeHaddock=NO]
@@ -752,6 +752,19 @@ AC_ARG_ENABLE(src-tree-haddock,
 dnl ** check for installed haddock
 FPTOOLS_HADDOCK
 
+AC_ARG_ENABLE(src-tree-alex,
+[  --enable-src-tree-alex
+        Build and use source tree (fptools/alex) version of Alex.
+],
+[UseSrcTreeAlex=YES],
+[UseSrcTreeAlex=NO]
+)
+dnl ** check for installed alex binary + version
+dnl    (don't do it if we're booting from .hc files though.)
+if test "$BootingFromHc" = "NO"; then
+FPTOOLS_ALEX
+fi;
+
 dnl --------------------------------------------------
 dnl ### program checking section ends here ###
 dnl --------------------------------------------------