- CHECK_LIBHEADER macro, which is based on GST_CHECK_LIBHEADER the main difference...

Original commit message from CVS:
- CHECK_LIBHEADER macro, which is based on GST_CHECK_LIBHEADER
the main difference between them is that you can specify cpp flags with
CHECK_LIBHEADER

diff --git a/m4/check-libheader.m4 b/m4/check-libheader.m4
new file mode 100644 (file)
index 0000000..42db689
--- /dev/null
+++ b/m4/check-libheader.m4
@@ -0,0 +1,42 @@
+dnl
+dnl CHECK-LIBHEADER(FEATURE-NAME, LIB-NAME, LIB-FUNCTION, HEADER-NAME,
+dnl                 ACTION-IF-FOUND, ACTION-IF-NOT-FOUND,
+dnl                 EXTRA-LDFLAGS, EXTRA-CPPFLAGS)
+dnl
+dnl FEATURE-NAME        - feature name; library and header files are treated
+dnl                       as feature, which we look for
+dnl LIB-NAME            - library name as in AC_CHECK_LIB macro
+dnl LIB-FUNCTION        - library symbol as in AC_CHECK_LIB macro
+dnl HEADER-NAME         - header file name as in AC_CHECK_HEADER
+dnl ACTION-IF-FOUND     - when feature is found then execute given action
+dnl ACTION-IF-NOT-FOUND - when feature is not found then execute given action
+dnl EXTRA-LDFLAGS       - extra linker flags (-L or -l)
+dnl EXTRA-CPPFLAGS      - extra C preprocessor flags, i.e. -I/usr/X11R6/include
+dnl
+dnl Based on GST_CHECK_LIBHEADER from gstreamer plugins 0.3.1.
+dnl
+AC_DEFUN(CHECK_LIBHEADER,
+[
+  AC_CHECK_LIB([$2], [$3], HAVE_[$1]=yes, HAVE_[$1]=no, [$7])
+  check_libheader_feature_name=translit([$1], A-Z, a-z)
+
+  if test "x$HAVE_[$1]" = "xyes"; then
+
+    check_libheader_save_CPPFLAGS=$CPPFLAGS
+    CPPFLAGS="[$8] $CPPFLAGS"
+    AC_CHECK_HEADER([$4], :, HAVE_[$1]=no)
+    CPPFLAGS=$check_libheader_save_CPPFLAGS
+
+    if test "x$HAVE_[$1]" = "xyes"; then
+      dnl execute what needs to be
+      ifelse([$5], , :, [$5])
+      AC_MSG_NOTICE(feature $check_libheader_feature_name is found)
+    else
+      ifelse([$6], , :, [$6])
+    fi
+  else
+    AC_MSG_WARN($check_libheader_feature_name not found)
+  fi
+  AC_SUBST(HAVE_[$1])
+]
+)