autotools: add macro to easily check for defines in headers

1 files changed, 20 insertions, 0 deletions

diff --git a/m4/efl_define.m4 b/m4/efl_define.m4
new file mode 100644
index 0000000000..2b73a691e8
--- /dev/null
+++ b/m4/efl_define.m4
@@ -0,0 +1,20 @@
+dnl
+dnl EFL_CHECK_DEFINE(symbol, header_file)
+dnl
+dnl NOTE: EFL_CHECK_DEFINE is strongly inspired by
+dnl       APR_CHECK_DEFINE which can be found in the
+dnl       sources of Apache's APR (under Apache Licence)
+dnl
+AC_DEFUN([EFL_CHECK_DEFINE], [
+  AC_CACHE_CHECK([for $1 in $2],ac_cv_define_$1,[
+    AC_EGREP_CPP(YES_IS_DEFINED, [
+#include <$2>
+#ifdef $1
+YES_IS_DEFINED
+#endif
+    ], ac_cv_define_$1=yes, ac_cv_define_$1=no)
+  ])
+  if test "$ac_cv_define_$1" = "yes"; then
+    AC_DEFINE(HAVE_$1, 1, [Define if $1 is defined in $2])
+  fi
+])