Test for presence of bison and flex when building from git

[ Update by Mathieu Desnoyers: handle VPATH build from tarball
  by prefixing path with $srcdir. ]

Signed-off-by: Yannick Brosseau <yannick.brosseau@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/configure.ac b/configure.ac
index 9d93791bfb7012950ab65139404fdd5025abb0e1..33c54fc079ecf5f2d418495f9c89bfe42581b41e 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -287,7 +287,19 @@ LT_INIT
 AC_PROG_YACC
 AC_PROG_LEX
 
-AC_DEFUN([AC_PROG_BISON], [AC_CHECK_PROGS(BISON, bison, bison)])
+if test ! -f "$srcdir/src/lib/lttng-ctl/filter/filter-parser.h"; then
+       if test x"$YACC" != "xbison -y"; then
+               AC_MSG_ERROR([[bison not found and is required when building from git.
+               Please install bison]])
+       fi
+fi
+
+if test ! -f "$srcdir/src/lib/lttng-ctl/filter/filter-lexer.c"; then
+       if test x"$LEX" != "xflex"; then
+               AC_MSG_ERROR([[flex not found and is required when building from git.
+               Please install flex]])
+       fi
+fi
 
 CFLAGS="-Wall $CFLAGS -g -fno-strict-aliasing"