Make the default triple optional by allowing an empty string

When building LLVM as a (potentially dynamic) library that can be linked against
by multiple compilers, the default triple is not really meaningful.
We allow to explicitely set it to an empty string when configuring LLVM.
In this case, said "target independent" tests in the test suite that are using
the default triple are disabled by matching the newly available feature
"default_triple".

Reviewers: probinson, echristo
Differential Revision: http://reviews.llvm.org/D12660

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 247775

Author: joker-eph

llvm/include/llvm/Config/config.h.cmake

@@ -420,8 +420,10 @@
 /* Installation directory for data files */
 #cmakedefine LLVM_DATADIR "${LLVM_DATADIR}"
 
-/* Target triple LLVM will generate code for by default */
-#cmakedefine LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}"
+/* Target triple LLVM will generate code for by default
+ * Doesn't use `cmakedefine` because it is allowed to be empty.
+ */
+#define LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}"
 
 /* Installation directory for documentation */
 #cmakedefine LLVM_DOCSDIR "${LLVM_DOCSDIR}"

llvm/test/BugPoint/remove_arguments_test.ll

@@ -5,7 +5,7 @@
 ; Test to make sure that arguments are removed from the function if they are
 ; unnecessary. And clean up any types that frees up too.
 
-; CHECK: target triple
+; CHECK: ModuleID
 ; CHECK-NOT: struct.anon
 %struct.anon = type { i32 }
 

llvm/test/CodeGen/Generic/lit.local.cfg

@@ -1,3 +1,3 @@
-if 'native' not in config.available_features:
+if not config.target_triple:
     config.unsupported = True
 

llvm/test/CodeGen/PowerPC/2006-01-20-ShiftPartsCrash.ll

@@ -1,4 +1,5 @@
 ; RUN: llc < %s
+; REQUIRES: default_triple
 
 define void @iterative_hash_host_wide_int() {
         %zero = alloca i32              ; <i32*> [#uses=2]

llvm/test/CodeGen/PowerPC/2006-08-15-SelectionCrash.ll

@@ -1,4 +1,5 @@
 ; RUN: llc < %s
+; REQUIRES: default_triple
 
 	%struct..0anon = type { i32 }
 	%struct.rtx_def = type { i16, i8, i8, [1 x %struct..0anon] }

llvm/test/CodeGen/PowerPC/2006-12-07-LargeAlloca.ll

@@ -1,6 +1,7 @@
 ; RUN: llc < %s -march=ppc64
 ; RUN: llc < %s -march=ppc32
 ; RUN: llc < %s 
+; REQUIRES: default_triple
 
 define void @bitap() {
 entry:

llvm/test/CodeGen/PowerPC/2006-12-07-SelectCrash.ll

@@ -1,6 +1,7 @@
 ; RUN: llc < %s -march=ppc64
 ; RUN: llc < %s -march=ppc32
 ; RUN: llc < %s
+; REQUIRES: default_triple
 
 @qsz.b = external global i1             ; <i1*> [#uses=1]
 

llvm/test/CodeGen/PowerPC/2007-11-19-VectorSplitting.ll

@@ -2,6 +2,7 @@
 ; RUN: llc < %s -march=ppc32 -mcpu=g3
 ; RUN: llc < %s -march=ppc32 -mcpu=g5
 ; PR1811
+; REQUIRES: default_triple
 
 define void @execute_shader(<4 x float>* %OUT, <4 x float>* %IN, <4 x float>*
 %CONST) {

llvm/test/CodeGen/PowerPC/load-shift-combine.ll

@@ -1,4 +1,5 @@
 ; RUN: llc < %s
+; REQUIRES: default_triple
 
 ; This used to cause a crash.  A standard load is converted to a pre-increment
 ; load.  Later the pre-increment load is combined with a subsequent SRL to

llvm/test/CodeGen/X86/2006-10-02-BoolRetCrash.ll

@@ -1,5 +1,6 @@
 ; RUN: llc < %s 
 ; PR933
+; REQUIRES: default_triple
 
 define fastcc i1 @test() {
         ret i1 true