From 9426358ea1fa84bac7b85f550f9efce12349c9da Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Tue, 22 May 2018 23:24:46 +0000
Subject: [PATCH] build: use cmake to find the libedit content

Use proper cmake techniques to detect where the libedit package resides.
This allows for the use of libedit from an alternative location which is
needed for supporting cross-compilation.

llvm-svn: 333041
---
 lldb/CMakeLists.txt                           |  2 +
 lldb/cmake/modules/FindLibEdit.cmake          | 62 +++++++++++++++++++
 .../Python/modules/readline/CMakeLists.txt    |  5 +-
 3 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 lldb/cmake/modules/FindLibEdit.cmake

diff --git a/lldb/CMakeLists.txt b/lldb/CMakeLists.txt
index 57e1e48c6751..83649e4fa8bb 100644
--- a/lldb/CMakeLists.txt
+++ b/lldb/CMakeLists.txt
@@ -29,6 +29,8 @@ endif ()
 set(LLDB_DISABLE_LIBEDIT ${LLDB_DEFAULT_DISABLE_LIBEDIT} CACHE BOOL "Disables the use of editline.")
 if (LLDB_DISABLE_LIBEDIT)
   add_definitions( -DLLDB_DISABLE_LIBEDIT )
+else()
+  find_package(LibEdit REQUIRED)
 endif()
 
 if(APPLE)
diff --git a/lldb/cmake/modules/FindLibEdit.cmake b/lldb/cmake/modules/FindLibEdit.cmake
new file mode 100644
index 000000000000..81204d42f1d0
--- /dev/null
+++ b/lldb/cmake/modules/FindLibEdit.cmake
@@ -0,0 +1,62 @@
+#.rst:
+# FindLibEdit
+# -----------
+#
+# Find libedit library and headers
+#
+# The module defines the following variables:
+#
+# ::
+#
+#   libedit_FOUND         - true if libedit was found
+#   libedit_INCLUDE_DIRS  - include search path
+#   libedit_LIBRARIES     - libraries to link
+#   libedit_VERSION       - version number
+
+if(libedit_INCLUDE_DIRS AND libedit_LIBRARIES)
+  set(libedit_FOUND TRUE)
+else()
+  find_package(PkgConfig QUIET)
+  pkg_check_modules(PC_LIBEDIT QUIET libedit)
+
+  find_path(libedit_INCLUDE_DIRS
+            NAMES
+              histedit.h
+            HINTS
+              ${PC_LIBEDIT_INCLUDEDIR}
+              ${PC_LIBEDIT_INCLUDE_DIRS}
+              ${CMAKE_INSTALL_FULL_INCLUDEDIR})
+  find_library(libedit_LIBRARIES
+               NAMES
+                 edit libedit
+               HINTS
+                 ${PC_LIBEDIT_LIBDIR}
+                 ${PC_LIBEDIT_LIBRARY_DIRS}
+                 ${CMAKE_INSTALL_FULL_LIBDIR})
+
+  if(libedit_INCLUDE_DIRS AND EXISTS "${libedit_INCLUDE_DIRS}/histedit.h")
+    file(STRINGS "${libedit_INCLUDE_DIRS}/histedit.h"
+         libedit_major_version_str
+         REGEX "^#define[ \t]+LIBEDIT_MAJOR[ \t]+[0-9]+")
+    string(REGEX REPLACE "^#define[ \t]+LIBEDIT_MAJOR[ \t]+([0-9]+)" "\\1"
+           LIBEDIT_MAJOR_VERSION "${libedit_major_version_str}")
+
+    file(STRINGS "${libedit_INCLUDE_DIRS}/histedit.h"
+         libedit_minor_version_str
+         REGEX "^#define[ \t]+LIBEDIT_MINOR[ \t]+[0-9]+")
+    string(REGEX REPLACE "^#define[ \t]+LIBEDIT_MINOR[ \t]+([0-9]+)" "\\1"
+           LIBEDIT_MINOR_VERSION "${libedit_minor_version_str}")
+
+    set(libedit_VERSION_STRING "${libedit_major_version}.${libedit_minor_version}")
+  endif()
+
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(libedit
+                                    REQUIRED_VARS
+                                      libedit_INCLUDE_DIRS
+                                      libedit_LIBRARIES
+                                    VERSION_VAR
+                                      libedit_VERSION_STRING)
+  mark_as_advanced(libedit_INCLUDE_DIRS libedit_LIBRARIES)
+endif()
+
diff --git a/lldb/scripts/Python/modules/readline/CMakeLists.txt b/lldb/scripts/Python/modules/readline/CMakeLists.txt
index 0a4376c1c324..d7b0e468fb9d 100644
--- a/lldb/scripts/Python/modules/readline/CMakeLists.txt
+++ b/lldb/scripts/Python/modules/readline/CMakeLists.txt
@@ -6,9 +6,12 @@ SET(PYTHON_DIRECTORY python${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}/site-
 # Build the readline python module
 include_directories(${PYTHON_INCLUDE_DIR})
 add_library(readline SHARED readline.cpp)
+target_include_directories(readline
+                           PRIVATE
+                             ${libedit_INCLUDE_DIRS})
 
 if (NOT LLDB_DISABLE_LIBEDIT)
-  target_link_libraries(readline ${PYTHON_LIBRARY} edit)
+  target_link_libraries(readline ${PYTHON_LIBRARY} ${libedit_LIBRARIES})
 else()
   target_link_libraries(readline ${PYTHON_LIBRARY})
 endif()