[xen staging] tools/configure: add bison as mandatory

[patchbot@xxxxxxx]

commit 20077d035224c6f3b3eef8b111b8b842635f2c40
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Fri Feb 5 12:53:27 2021 +0100
Commit:     Ian Jackson <iwj@xxxxxxxxxxxxxx>
CommitDate: Wed Feb 10 11:11:55 2021 +0000

    tools/configure: add bison as mandatory
    
    Bison is now mandatory when the pvshim build is enabled in order to
    generate the Kconfig.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
    Reviewed-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 tools/configure.ac | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/configure.ac b/tools/configure.ac
index 3a3e7b4b2b..6b611deb13 100644
--- a/tools/configure.ac
+++ b/tools/configure.ac
@@ -309,7 +309,6 @@ AC_ARG_VAR([AWK], [Path to awk tool])
 AC_PROG_CC
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL
-AC_PATH_PROG([BISON], [bison])
 AC_PATH_PROG([FLEX], [flex])
 AX_PATH_PROG_OR_FAIL([PERL], [perl])
 AX_PATH_PROG_OR_FAIL([AWK], [awk])
@@ -517,6 +516,11 @@ AC_ARG_ENABLE([pvshim],
     esac
 ])
 AC_SUBST(pvshim)
+AS_IF([test "x$pvshim" = "xy"], [
+    AX_PATH_PROG_OR_FAIL([BISON], [bison])
+], [
+    AC_PATH_PROG([BISON], [bison])
+])
 
 AX_FIND_HEADER([INCLUDE_ENDIAN_H], [endian.h sys/endian.h])
 
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