For PR814:

Provide support for making cross-compiling builds. See the PR for details.
Patch provided by Anton Korobeynikov. Thanks, Anton!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29309 91177308-0d34-0410-b5e6-96231b3b80d8

Makefile.config.in

@@ -97,6 +97,13 @@ OS=@OS@
 # Target hardware architecture
 ARCH=@ARCH@
 
+# Indicates, whether we're cross-compiling LLVM or not
+LLVM_CROSS_COMPILING=@LLVM_CROSS_COMPILING@
+
+# Executable file extension for build platform (mainly for
+# tablegen call if we're cross-compiling).
+BUILD_EXEEXT=@BUILD_EXEEXT@
+
 # Target triple (cpu-vendor-os) for which we should generate code
 TARGET_TRIPLE=@target@
 
@@ -214,10 +221,10 @@ ENABLE_THREADS := @ENABLE_THREADS@
 # Enable JIT for this platform
 TARGET_HAS_JIT = @TARGET_HAS_JIT@
 
-# Shared library extension for this platform.
+# Shared library extension for host platform.
 SHLIBEXT = @SHLIBEXT@
 
-# Executable file extension for this platform.
+# Executable file extension for host platform.
 EXEEXT = @EXEEXT@
 
 # Things we just assume are "there"

Makefile.rules

@@ -281,7 +281,11 @@ ifndef LLVMAS
 LLVMAS   := $(LLVMToolDir)/llvm-as$(EXEEXT)
 endif
 ifndef TBLGEN
-TBLGEN   := $(LLVMToolDir)/tblgen$(EXEEXT)
+  ifeq ($(LLVM_CROSS_COMPILING),1)
+    TBLGEN   := $(LLVMToolDir)/tblgen$(BUILD_EXEEXT)
+  else
+    TBLGEN   := $(LLVMToolDir)/tblgen$(EXEEXT)
+  endif
 endif
 ifndef GCCAS
 GCCAS    := $(LLVMToolDir)/gccas$(EXEEXT)

autoconf/configure.ac

@@ -98,9 +98,9 @@ AC_CANONICAL_TARGET
 
 dnl Determine the platform type and cache its value. This helps us configure
 dnl the System library to the correct build platform.
-AC_CACHE_CHECK([type of operating system we're on],
+AC_CACHE_CHECK([type of operating system we're going to host on],
                [llvm_cv_os_type],
-[case $build in
+[case $host in
   *-*-aix*) 
     llvm_cv_os_type="AIX" 
     llvm_cv_platform_type="Unix" ;;
@@ -188,6 +188,14 @@ AC_SUBST(ARCH,$llvm_cv_target_arch)
 dnl Check for the endianness of the target
 AC_C_BIGENDIAN(AC_SUBST([ENDIAN],[big]),AC_SUBST([ENDIAN],[little]))
 
+dnl Check for build platform executable suffix if we're crosscompiling
+if test "$cross_compiling" = yes; then
+  AC_SUBST(LLVM_CROSS_COMPILING, [1])  
+  AC_BUILD_EXEEXT
+else
+  AC_SUBST(LLVM_CROSS_COMPILING, [0])
+fi
+
 dnl Check to see if there's a "CVS" directory indicating that this build is
 dnl being done from a CVS checkout. This sets up several defaults for the
 dnl command line switches. When we build with a CVS directory, we get a