[llvm] r305632 - [CMake] Introduce LLVM_TARGET_TRIPLE_ENV as an option to override LLVM_DEFAULT_TARGET_TRIPLE at runtime.

[NAKAMURA Takumi via llvm-commits]

Author: chapuni
Date: Fri Jun 16 22:19:08 2017
New Revision: 305632

URL: http://llvm.org/viewvc/llvm-project?rev=305632&view=rev
Log:
[CMake] Introduce LLVM_TARGET_TRIPLE_ENV as an option to override LLVM_DEFAULT_TARGET_TRIPLE at runtime.

No behavior is changed if LLVM_TARGET_TRIPLE_ENV is blank or undefined.

If LLVM_TARGET_TRIPLE_ENV is "TEST_TARGET_TRIPLE" and $TEST_TARGET_TRIPLE is not blank,
llvm::sys::getDefaultTargetTriple() returns $TEST_TARGET_TRIPLE.
Lit resets config.target_triple and config.environment[LLVM_TARGET_TRIPLE_ENV] to change the default target.

Without changing LLVM_DEFAULT_TARGET_TRIPLE nor rebuilding, lit can be run;

  TEST_TARGET_TRIPLE=i686-pc-win32 bin/llvm-lit -sv path/to/test/
  TEST_TARGET_TRIPLE=i686-pc-win32 ninja check-clang-tools

Differential Revision: https://reviews.llvm.org/D33662

Modified:
    llvm/trunk/CMakeLists.txt
    llvm/trunk/cmake/modules/AddLLVM.cmake
    llvm/trunk/include/llvm/Config/config.h.cmake
    llvm/trunk/lib/Support/Unix/Host.inc
    llvm/trunk/lib/Support/Windows/Host.inc

Modified: llvm/trunk/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/CMakeLists.txt?rev=305632&r1=305631&r2=305632&view=diff
==============================================================================
--- llvm/trunk/CMakeLists.txt (original)
+++ llvm/trunk/CMakeLists.txt Fri Jun 16 22:19:08 2017
@@ -570,6 +570,10 @@ if (LLVM_BUILD_STATIC)
   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")
 endif()
 
+# Override the default target with an environment variable named by LLVM_TARGET_TRIPLE_ENV.
+set(LLVM_TARGET_TRIPLE_ENV CACHE STRING "The name of environment variable to override default target. Disabled by blank.")
+mark_as_advanced(LLVM_TARGET_TRIPLE_ENV)
+
 # All options referred to from HandleLLVMOptions have to be specified
 # BEFORE this include, otherwise options will not be correctly set on
 # first cmake run

Modified: llvm/trunk/cmake/modules/AddLLVM.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/AddLLVM.cmake?rev=305632&r1=305631&r2=305632&view=diff
==============================================================================
--- llvm/trunk/cmake/modules/AddLLVM.cmake (original)
+++ llvm/trunk/cmake/modules/AddLLVM.cmake Fri Jun 16 22:19:08 2017
@@ -1133,6 +1133,19 @@ function(configure_lit_site_cfg input ou
 
   set(LIT_SITE_CFG_IN_HEADER  "## Autogenerated from ${input}\n## Do not edit!")
 
+  # Override config_target_triple (and the env)
+  if(LLVM_TARGET_TRIPLE_ENV)
+    # This is expanded into the heading.
+    string(CONCAT LIT_SITE_CFG_IN_HEADER "${LIT_SITE_CFG_IN_HEADER}\n\n"
+      "import os\n"
+      "target_env = \"${LLVM_TARGET_TRIPLE_ENV}\"\n"
+      "config.target_triple = config.environment[target_env] = os.environ.get(target_env, \"${TARGET_TRIPLE}\")\n"
+      )
+
+    # This is expanded to; config.target_triple = ""+config.target_triple+""
+    set(TARGET_TRIPLE "\"+config.target_triple+\"")
+  endif()
+
   configure_file(${input} ${output} @ONLY)
 endfunction()
 

Modified: llvm/trunk/include/llvm/Config/config.h.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Config/config.h.cmake?rev=305632&r1=305631&r2=305632&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Config/config.h.cmake (original)
+++ llvm/trunk/include/llvm/Config/config.h.cmake Fri Jun 16 22:19:08 2017
@@ -356,6 +356,9 @@
 /* Define if this is Win32ish platform */
 #cmakedefine LLVM_ON_WIN32 ${LLVM_ON_WIN32}
 
+/* Define if overriding target triple is enabled */
+#cmakedefine LLVM_TARGET_TRIPLE_ENV "${LLVM_TARGET_TRIPLE_ENV}"
+
 /* Define if we have the Intel JIT API runtime support library */
 #cmakedefine01 LLVM_USE_INTEL_JITEVENTS
 

Modified: llvm/trunk/lib/Support/Unix/Host.inc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Unix/Host.inc?rev=305632&r1=305631&r2=305632&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Unix/Host.inc (original)
+++ llvm/trunk/lib/Support/Unix/Host.inc Fri Jun 16 22:19:08 2017
@@ -45,5 +45,11 @@ std::string sys::getDefaultTargetTriple(
     TargetTripleString += getOSVersion();
   }
 
+  // Override the default target with an environment variable named by LLVM_TARGET_TRIPLE_ENV.
+#if defined(LLVM_TARGET_TRIPLE_ENV)
+  if (const char *EnvTriple = std::getenv(LLVM_TARGET_TRIPLE_ENV))
+    TargetTripleString = EnvTriple;
+#endif
+
   return Triple::normalize(TargetTripleString);
 }

Modified: llvm/trunk/lib/Support/Windows/Host.inc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Windows/Host.inc?rev=305632&r1=305631&r2=305632&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Windows/Host.inc (original)
+++ llvm/trunk/lib/Support/Windows/Host.inc Fri Jun 16 22:19:08 2017
@@ -18,5 +18,13 @@
 using namespace llvm;
 
 std::string sys::getDefaultTargetTriple() {
-  return Triple::normalize(LLVM_DEFAULT_TARGET_TRIPLE);
+  const char *Triple = LLVM_DEFAULT_TARGET_TRIPLE;
+
+  // Override the default target with an environment variable named by LLVM_TARGET_TRIPLE_ENV.
+#if defined(LLVM_TARGET_TRIPLE_ENV)
+  if (const char *EnvTriple = std::getenv(LLVM_TARGET_TRIPLE_ENV))
+    Triple = EnvTriple;
+#endif
+
+  return Triple::normalize(Triple);
 }