autoconf: use --warning=cross only if supported

Adapt autoconf to pass --warning=cross to automake only if
supported.

[YOCTO #842]

Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/meta/recipes-devtools/autoconf/autoconf/check-automake-cross-warning.patch b/meta/recipes-devtools/autoconf/autoconf/check-automake-cross-warning.patch
new file mode 100644
index 0000000000..73394d7d52
--- /dev/null
+++ b/meta/recipes-devtools/autoconf/autoconf/check-automake-cross-warning.patch
@@ -0,0 +1,34 @@
+Use --warning=cross only if supported by automake
+
+Upstream-Status: Inappropriate [configuration]
+
+Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
+
+--- a/bin/autoreconf.in
++++ b/bin/autoreconf.in
+@@ -127,6 +127,8 @@ my $aclocal_supports_warnings = 0;
+ my $automake_supports_force_missing = 0;
+ # Does automake support -Wfoo?
+ my $automake_supports_warnings = 0;
++# Does automake support --warning=cross
++my $automake_supports_cross_warning = 0;
+ 
+ my @prepend_include;
+ my @include;
+@@ -191,6 +193,7 @@ sub parse_args ()
+   $aclocal_supports_warnings = $aclocal_help =~ /--warnings/;
+   $automake_supports_force_missing = $automake_help =~ /--force-missing/;
+   $automake_supports_warnings = $automake_help =~ /--warnings/;
++  $automake_supports_cross_warning = $automake_help =~ /cross/;
+ 
+   # Dispatch autoreconf's option to the tools.
+   # --include;
+@@ -244,6 +247,8 @@ sub parse_args ()
+       $libtoolize .= ' --debug';
+     }
+   # --warnings;
++  @warning = grep { $_ ne "cross" } @warning
++    if ! $automake_supports_cross_warning;
+   if (@warning)
+     {
+       my $warn = ' --warnings=' . join (',', @warning);