From ecfe67c21799891f27597455ed84c70de7769f36 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Tue, 2 Sep 2008 17:35:16 +0000
Subject: [PATCH] Reapply majority of r55557 but with the changes to
 compilation flags disabled until issues with gcc 4.1 on linux 32-bit are
 resolved.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55636 91177308-0d34-0410-b5e6-96231b3b80d8
---
 Makefile.config.in                       |  3 +++
 Makefile.rules                           |  4 ++++
 autoconf/configure.ac                    |  2 ++
 autoconf/m4/visibility_inlines_hidden.m4 | 22 ++++++++++++++++++++++
 4 files changed, 31 insertions(+)
 create mode 100644 autoconf/m4/visibility_inlines_hidden.m4

diff --git a/Makefile.config.in b/Makefile.config.in
index f3a93465928..5a0dcd59c3a 100644
--- a/Makefile.config.in
+++ b/Makefile.config.in
@@ -234,6 +234,9 @@ ENABLE_THREADS := @ENABLE_THREADS@
 # Do we want to build with position independent code?
 ENABLE_PIC := @ENABLE_PIC@
 
+# Use -fvisibility-inlines-hidden?
+ENABLE_VISIBILITY_INLINES_HIDDEN := @ENABLE_VISIBILITY_INLINES_HIDDEN@
+
 # This option tells the Makefiles to produce verbose output.
 # It essentially prints the commands that make is executing
 #VERBOSE = 1
diff --git a/Makefile.rules b/Makefile.rules
index e99d4960bbb..d0d83c038be 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -241,6 +241,10 @@ else
   endif
 endif
 
+#ifeq ($(ENABLE_VISIBILITY_INLINES_HIDDEN),1)
+#    CXX.Flags += -fvisibility-inlines-hidden
+#endif
+
 # IF REQUIRES_EH=1 is specified then don't disable exceptions
 ifndef REQUIRES_EH
   CXX.Flags += -fno-exceptions
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index ca160d163a2..35d017e1bd7 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -975,6 +975,8 @@ if test "$binding_prereqs_failed" = 1 ; then
   AC_MSG_ERROR([Prequisites for bindings not satisfied. Fix them or use configure --disable-bindings.])
 fi
 
+dnl Determine if the compiler supports -fvisibility-inlines-hidden.
+AC_CXX_USE_VISIBILITY_INLINES_HIDDEN
 
 dnl===-----------------------------------------------------------------------===
 dnl===
diff --git a/autoconf/m4/visibility_inlines_hidden.m4 b/autoconf/m4/visibility_inlines_hidden.m4
new file mode 100644
index 00000000000..42ddbe9128b
--- /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
+])