From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
AM_PROG_FLEX macro will set the LEX variable using the missing
script when the flex is not present. This will confuse the
configure.ac check, which expects the AC_PROG_FLEX behaviour,
and will so fail to detect the missing flex:
AS_IF([test x"$LEX" != "x:" -a x"$YACC" != xyacc],
[enable_assembler=yes],
[enable_assembler=no])
This is because AM_PROG_LEX sets the LEX variable to
"${SHELL} /home/sc/intel-gpu-tools/build-aux/missing flex",
while AC_PROG_LEX would set it to ":".
If for some reason we really need to keep AM_PROG_LEX,
alternative fix could be something like this placed before
the above AS_IF check:
AC_MSG_CHECKING([checking for working flex])
if ! eval "$LEX --version >/dev/null 2>&1"; then
AC_MSG_RESULT([failed])
LEX=:
else
AC_MSG_RESULT([pass])
fi
Note the evil eval needed to recursively expand variables.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
configure.ac | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index 5342e33c8293..82857a8325b1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,7 +40,7 @@ AM_INIT_AUTOMAKE([1.12 foreign subdir-objects dist-bzip2])
AM_PATH_PYTHON([3],, [:])
AC_PROG_CC
-AM_PROG_LEX
+AC_PROG_LEX
AC_PROG_YACC
# check for gtk-doc
--
2.9.4
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