From fd5de54fa1df41dbb46b8869901541987cbdc427 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Thu, 26 Nov 2009 10:11:43 -0800
Subject: Not all systems have a yacc alias for the yacc program. txr is known
 to work with two yacc implementations: GNU Bison and Berkeley yacc. Let's add
 some auto-detection for yacc.

---
 configure | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 68 insertions(+), 7 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index a5e0d2b9..58a13760 100755
--- a/configure
+++ b/configure
@@ -109,7 +109,10 @@ intptr=${intptr-}
 tool_prefix=${tool_prefix-}
 lex=${lex-'$(cross)$(tool_prefix)flex'}
 lexlib=${lexlib--lfl}
-yacc=${yacc-'$(cross)$(tool_prefix)yacc'}
+yaccname_given=${yaccname+yes}
+yaccname=${yaccname-}
+yacc_given=${yacc+yes}
+yacc=${yacc-'$(cross)$(tool_prefix)$(yaccname)'}
 nm=${nm-'$(cross)$(tool_prefix)nm'}
 opt_flags=${opt_flags--O2}
 lang_flags=${lang_flags--ansi -D_POSIX_C_SOURCE=2}
@@ -249,6 +252,12 @@ lexlib [$lexlib]
 
   Specifies the linker flag to use for linking the lex library.
 
+yaccname [$yaccname]
+
+  Specifies just the name of the yacc program without the path.
+  The following variable, yacc, specifies the full name.
+  If blank, the choice yacc program will be auto-detected.
+
 yacc [$yacc]
 
   Specifies the program to use for compiling yacc scanners to C.
@@ -446,12 +455,9 @@ else
   printf "warning: its recommended to build in a separate directory\n"
 fi
 
-#
-# Finally, we generate config.make
-#
-printf "generating config.make ...\n"
-
-cat > config.make <<!
+gen_config_make()
+{
+  cat > config.make <<!
 # absolute path to source code directory
 top_srcdir := $top_srcdir
 
@@ -480,6 +486,9 @@ cross := $cross
 # compiler name
 ccname = $ccname
 
+# name of yacc program
+yaccname = $yaccname
+
 # prefix for compiler command
 compiler_prefix := $compiler_prefix
 
@@ -501,6 +510,15 @@ REMOVE_FLAGS := $remove_flags
 LEX_DBG_FLAGS := $lex_dbg_flags
 TXR_DBG_OPTS := $txr_dbg_opts
 !
+}
+
+#
+# Before doing some other tests, we need a config.make
+#
+
+printf "generating config.make ... "
+gen_config_make
+printf "\n"
 
 #
 # Start config.h header
@@ -682,13 +700,56 @@ $inline int func(void)
   printf "#define HAVE_VALGRIND\n" >> config.h
 fi
 
+#
+# Yacc tests
+#
+
+printf "Checking for yacc program ... "
+
+if [ -z "$yacc_given" -a -z "$yaccname_given" ] ; then
+  for yaccname in "yacc" "byacc" "bison -y" "" ; do
+    yaccpath=$(make yaccname="$yaccname" conftest.yacc)
+    if command -v $yaccpath > /dev/null ; then
+      break;
+    fi
+  done
+
+  if [ -z "$yaccname" ] ; then
+    printf "not found\n"
+    exit 1
+  fi
+
+  printf '"%s"\n' "$yaccpath"
+else
+  yaccpath=$(make conftest.yacc)
+  case $yaccpath in
+  *bison )
+    printf "error\n\n"
+    printf "GNU Bison needs -y to behave like yacc\n\n"
+    printf "This needs to be specified in the --yaccname or --yacc option\n\n"
+    exit 1
+    ;;
+  * )
+    printf "given\n"
+    ;;
+  esac
+fi
 
 #
 # Clean up
 #
+
 rm -f conftest conftest.[co] conftest.{err,syms}
 rm -f conftest2 conftest[12].[oc]
 
+#
+# Regenerate config.make
+#
+
+printf "regenerating config.make ... "
+gen_config_make
+printf "\n"
+
 #
 # Save configuration in config.log
 #
-- 
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