Reapply majority of r55557 but with the changes to compilation flags

[oota-llvm.git] / autoconf / m4 / visibility_inlines_hidden.m4

diff --git a/autoconf/m4/visibility_inlines_hidden.m4 b/autoconf/m4/visibility_inlines_hidden.m4
new file mode 100644 (file)
index 0000000..42ddbe9
--- /dev/null
+++ b/autoconf/m4/visibility_inlines_hidden.m4
@@ -0,0 +1,22 @@
+#
+# Determine if the compiler accepts -fvisibility-inlines-hidden
+#
+# This macro is specific to LLVM.
+#
+AC_DEFUN([AC_CXX_USE_VISIBILITY_INLINES_HIDDEN],
+[AC_CACHE_CHECK([for compiler -fvisibility-inlines-hidden option],
+                [llvm_cv_cxx_visibility_inlines_hidden],
+[ AC_LANG_PUSH([C++])
+  oldcxxflags="$CXXFLAGS"
+  CXXFLAGS="$CXXFLAGS -fvisibility-inlines-hidden"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+    [llvm_cv_cxx_visibility_inlines_hidden=yes],[llvm_cv_cxx_visibility_inlines_hidden=no])
+  CXXFLAGS="$oldcxxflags"
+  AC_LANG_POP([C++])
+])
+if test "$llvm_cv_cxx_visibility_inlines_hidden" = yes ; then
+  AC_SUBST([ENABLE_VISIBILITY_INLINES_HIDDEN],[1])
+else
+  AC_SUBST([ENABLE_VISIBILITY_INLINES_HIDDEN],[0])
+fi
+])