X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=aclocal.m4;h=7472ce38eed83be90b766dd0221d8cde7c94f7c4;hb=b9267a7e597428ad9c8ce3a06e452dcfe7226300;hp=3d93292f481a43256e01615fc6e652bd159b1e02;hpb=6c20d552d0d9d307ddaa9c032fd031c743a85a79;p=ghc-hetmet.git

diff --git a/aclocal.m4 b/aclocal.m4
index 3d93292..7472ce3 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1109,4 +1109,22 @@ dnl and we don't want to be global namespace polluters.
   AC_LANG_RESTORE
 ])
 
+
+dnl @synopsis FP_EMPTY_STRUCTS
+dnl 
+dnl Check whether empty structs is accepted by CC.
+dnl
+AC_DEFUN(FP_EMPTY_STRUCTS,
+[AC_CACHE_CHECK(empty struct support, fptools_cv_empty_structs,
+[AC_TRY_COMPILE([
+typedef struct { /*empty*/ } StgFoo;
+],
+[int i;], 
+fptools_cv_empty_structs=yes,
+fptools_cv_empty_structs=no)])
+if test "$fptools_cv_empty_structs" = yes; then
+AC_DEFINE([SUPPORTS_EMPTY_STRUCTS], [1], [Define to 1 if C compiler supports declaration of empty structure types.])
+fi
+])
+
 # LocalWords:  fi