build/cmake: Change to require Python be available.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143742 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 56 insertions, 51 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d29c784e1c..616330f571 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -205,6 +205,15 @@ option(LLVM_INCLUDE_TESTS "Generate build targets for the LLVM unit tests." ON)
 include(config-ix)
 include(HandleLLVMOptions)
 
+# Verify that we can find a Python interpreter,
+include(FindPythonInterp)
+if( NOT PYTHONINTERP_FOUND )
+  message(FATAL_ERROR
+"Unable to find Python interpreter, required for builds and testing.
+
+Please install Python or specify the PYTHON_EXECUTABLE CMake variable.")
+endif()
+
 # Configure all of the various header file fragments LLVM uses which depend on
 # configuration variables.
 set(LLVM_ENUM_ASM_PRINTERS "")
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 6bda44b36c..cbad83cae9 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -24,62 +24,58 @@ else() # Default for all other unix like systems.
   set(SHLIBPATH_VAR "LD_LIBRARY_PATH")
 endif()
 
-include(FindPythonInterp)
-if(PYTHONINTERP_FOUND)
-  set(LIT_ARGS "${LLVM_LIT_ARGS}")
-  separate_arguments(LIT_ARGS)
+set(LIT_ARGS "${LLVM_LIT_ARGS}")
+separate_arguments(LIT_ARGS)
 
-  configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/site.exp.in
-    ${CMAKE_CURRENT_BINARY_DIR}/site.exp)
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/site.exp.in
+  ${CMAKE_CURRENT_BINARY_DIR}/site.exp)
 
-  MAKE_DIRECTORY(${CMAKE_CURRENT_BINARY_DIR}/Unit)
+MAKE_DIRECTORY(${CMAKE_CURRENT_BINARY_DIR}/Unit)
 
-  # Configuration-time: See Unit/lit.site.cfg.in
-  set(LLVM_BUILD_MODE "%(build_mode)s")
+# Configuration-time: See Unit/lit.site.cfg.in
+set(LLVM_BUILD_MODE "%(build_mode)s")
 
-  set(LLVM_SOURCE_DIR ${LLVM_MAIN_SRC_DIR})
-  set(LLVM_BINARY_DIR ${LLVM_BINARY_DIR})
-  set(LLVM_TOOLS_DIR "${LLVM_TOOLS_BINARY_DIR}/%(build_config)s")
-  set(PYTHON_EXECUTABLE ${PYTHON_EXECUTABLE})
-  set(ENABLE_SHARED ${LLVM_SHARED_LIBS_ENABLED})
-  set(SHLIBPATH_VAR ${SHLIBPATH_VAR})
+set(LLVM_SOURCE_DIR ${LLVM_MAIN_SRC_DIR})
+set(LLVM_BINARY_DIR ${LLVM_BINARY_DIR})
+set(LLVM_TOOLS_DIR "${LLVM_TOOLS_BINARY_DIR}/%(build_config)s")
+set(PYTHON_EXECUTABLE ${PYTHON_EXECUTABLE})
+set(ENABLE_SHARED ${LLVM_SHARED_LIBS_ENABLED})
+set(SHLIBPATH_VAR ${SHLIBPATH_VAR})
 
-  if(LLVM_ENABLE_ASSERTIONS AND NOT MSVC_IDE)
-    set(ENABLE_ASSERTIONS "1")
-  else()
-    set(ENABLE_ASSERTIONS "0")
-  endif()
-
-  configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
-    ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg
-    @ONLY)
-  configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.site.cfg.in
-    ${CMAKE_CURRENT_BINARY_DIR}/Unit/lit.site.cfg
-    @ONLY)
+if(LLVM_ENABLE_ASSERTIONS AND NOT MSVC_IDE)
+  set(ENABLE_ASSERTIONS "1")
+else()
+  set(ENABLE_ASSERTIONS "0")
+endif()
 
-  add_custom_target(check
-    COMMAND ${PYTHON_EXECUTABLE}
-                ${LLVM_SOURCE_DIR}/utils/lit/lit.py
-                --param llvm_site_config=${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg
-                --param llvm_unit_site_config=${CMAKE_CURRENT_BINARY_DIR}/Unit/lit.site.cfg
-                --param build_config=${CMAKE_CFG_INTDIR}
-                --param build_mode=${RUNTIME_BUILD_MODE}
-                ${LIT_ARGS}
-                ${CMAKE_CURRENT_BINARY_DIR}
-                COMMENT "Running LLVM regression tests")
-  set_target_properties(check PROPERTIES FOLDER "Tests")
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
+  ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg
+  @ONLY)
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.site.cfg.in
+  ${CMAKE_CURRENT_BINARY_DIR}/Unit/lit.site.cfg
+  @ONLY)
 
-  add_custom_target(check.deps)
-  add_dependencies(check check.deps)
-  add_dependencies(check.deps
-                UnitTests
-                BugpointPasses LLVMHello
-                llc lli llvm-ar llvm-as llvm-dis llvm-extract llvm-dwarfdump
-                llvm-ld llvm-link llvm-mc llvm-nm llvm-objdump macho-dump opt
-                FileCheck count not)
-  set_target_properties(check.deps PROPERTIES FOLDER "Tests")
+add_custom_target(check
+  COMMAND ${PYTHON_EXECUTABLE}
+              ${LLVM_SOURCE_DIR}/utils/lit/lit.py
+              --param llvm_site_config=${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg
+              --param llvm_unit_site_config=${CMAKE_CURRENT_BINARY_DIR}/Unit/lit.site.cfg
+              --param build_config=${CMAKE_CFG_INTDIR}
+              --param build_mode=${RUNTIME_BUILD_MODE}
+              ${LIT_ARGS}
+              ${CMAKE_CURRENT_BINARY_DIR}
+              COMMENT "Running LLVM regression tests")
+set_target_properties(check PROPERTIES FOLDER "Tests")
 
-endif()
+add_custom_target(check.deps)
+add_dependencies(check check.deps)
+add_dependencies(check.deps
+              UnitTests
+              BugpointPasses LLVMHello
+              llc lli llvm-ar llvm-as llvm-dis llvm-extract llvm-dwarfdump
+              llvm-ld llvm-link llvm-mc llvm-nm llvm-objdump macho-dump opt
+              FileCheck count not)
+set_target_properties(check.deps PROPERTIES FOLDER "Tests")