From ad95d9ef50cbd789025dbff8a1e018650cbcdc7f Mon Sep 17 00:00:00 2001
From: Brian Gaeke <gaeke@uiuc.edu>
Date: Mon, 16 Jun 2003 21:54:01 +0000
Subject: Isolate machine-dependent use of <alloca.h> in "Support/Alloca.h", so
 that we can easily change its use to be conditional on the result of an
 autoconf test later.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6723 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/Support/Alloca.h                          | 30 +++++++++++++++++++++++
 lib/CodeGen/InstrSelection/InstrForest.cpp        |  2 +-
 lib/Support/SystemUtils.cpp                       |  2 +-
 lib/Target/SparcV9/InstrSelection/InstrForest.cpp |  2 +-
 lib/Target/X86/X86CodeEmitter.cpp                 |  2 +-
 support/lib/Support/SystemUtils.cpp               |  2 +-
 tools/bugpoint/SystemUtils.cpp                    |  2 +-
 7 files changed, 36 insertions(+), 6 deletions(-)
 create mode 100644 include/Support/Alloca.h

diff --git a/include/Support/Alloca.h b/include/Support/Alloca.h
new file mode 100644
index 0000000000..3c163ed0d6
--- /dev/null
+++ b/include/Support/Alloca.h
@@ -0,0 +1,30 @@
+//===-- include/Support/Alloca.h - Support for alloca header -----*- C++ -*--=//
+//
+// Some platforms do not have alloca.h; others do. You can include this
+// file instead of <alloca.h> and it will include <alloca.h> on the platforms
+// that require you to do so to use alloca().
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_ALLOCA_H
+#define LLVM_SUPPORT_ALLOCA_H
+
+// TODO: Determine HAVE_ALLOCA_H based on autoconf results.
+// The following method is too brittle.
+#if defined(HAVE_ALLOCA_H)
+#undef HAVE_ALLOCA_H
+#endif
+
+#if defined(__linux__)
+#define HAVE_ALLOCA_H 1
+#elif defined(__sparc__)
+#define HAVE_ALLOCA_H 1
+#elif defined(__FreeBSD__)
+// not defined here
+#endif
+
+#if HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
+
+#endif  /* LLVM_SUPPORT_ALLOCA_H */
diff --git a/lib/CodeGen/InstrSelection/InstrForest.cpp b/lib/CodeGen/InstrSelection/InstrForest.cpp
index c33faec9a0..5afa1daccd 100644
--- a/lib/CodeGen/InstrSelection/InstrForest.cpp
+++ b/lib/CodeGen/InstrSelection/InstrForest.cpp
@@ -21,7 +21,7 @@
 #include "llvm/Type.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "Support/STLExtras.h"
-#include <alloca.h>
+#include "Support/Alloca.h"
 using std::cerr;
 using std::vector;
 
diff --git a/lib/Support/SystemUtils.cpp b/lib/Support/SystemUtils.cpp
index 034c141f79..c88a516e9f 100644
--- a/lib/Support/SystemUtils.cpp
+++ b/lib/Support/SystemUtils.cpp
@@ -10,7 +10,7 @@
 #include <fstream>
 #include <iostream>
 #include <cstdlib>
-#include <alloca.h>
+#include "Support/Alloca.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
diff --git a/lib/Target/SparcV9/InstrSelection/InstrForest.cpp b/lib/Target/SparcV9/InstrSelection/InstrForest.cpp
index c33faec9a0..5afa1daccd 100644
--- a/lib/Target/SparcV9/InstrSelection/InstrForest.cpp
+++ b/lib/Target/SparcV9/InstrSelection/InstrForest.cpp
@@ -21,7 +21,7 @@
 #include "llvm/Type.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "Support/STLExtras.h"
-#include <alloca.h>
+#include "Support/Alloca.h"
 using std::cerr;
 using std::vector;
 
diff --git a/lib/Target/X86/X86CodeEmitter.cpp b/lib/Target/X86/X86CodeEmitter.cpp
index 45d0b8c547..bfb4aaa951 100644
--- a/lib/Target/X86/X86CodeEmitter.cpp
+++ b/lib/Target/X86/X86CodeEmitter.cpp
@@ -13,7 +13,7 @@
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/Value.h"
 #include "Support/Statistic.h"
-#include <alloca.h>
+#include "Support/Alloca.h"
 
 namespace {
   Statistic<>
diff --git a/support/lib/Support/SystemUtils.cpp b/support/lib/Support/SystemUtils.cpp
index 034c141f79..c88a516e9f 100644
--- a/support/lib/Support/SystemUtils.cpp
+++ b/support/lib/Support/SystemUtils.cpp
@@ -10,7 +10,7 @@
 #include <fstream>
 #include <iostream>
 #include <cstdlib>
-#include <alloca.h>
+#include "Support/Alloca.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
diff --git a/tools/bugpoint/SystemUtils.cpp b/tools/bugpoint/SystemUtils.cpp
index 034c141f79..c88a516e9f 100644
--- a/tools/bugpoint/SystemUtils.cpp
+++ b/tools/bugpoint/SystemUtils.cpp
@@ -10,7 +10,7 @@
 #include <fstream>
 #include <iostream>
 #include <cstdlib>
-#include <alloca.h>
+#include "Support/Alloca.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-- 
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