Add native and cross compiling CMake build support

4 files changed, 144 insertions, 0 deletions

diff --git a/cmake/Toolchain-Arch-mingw32.cmake.sample b/cmake/Toolchain-Arch-mingw32.cmake.sample
new file mode 100644
index 000000000..727fa04ce
--- /dev/null
+++ b/cmake/Toolchain-Arch-mingw32.cmake.sample
@@ -0,0 +1,30 @@
+# Sample toolchain file for building for Windows from an Arch Linux system.
+#
+# Typical usage:
+#    1) install cross compiler: `sudo pacman -S mingw32-gcc`
+#    2) cp cmake/Toolchain-Arch-mingw32.cmake.sample ~/Toolchain-Arch-mingw32.cmake
+#    3) tweak toolchain values as needed
+#    4) cd build
+#    5) cmake -DCMAKE_TOOLCHAIN_FILE=~/Toolchain-Arch-mingw32.cmake ..
+
+# name of the target OS on which the built artifacts will run
+# and the toolchain prefix
+set(CMAKE_SYSTEM_NAME Windows)
+set(TOOLCHAIN_PREFIX i486-mingw32)
+
+# cross compilers to use for C and C++
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+
+# target environment on the build host system
+#   set 1st to dir with the cross compiler's C/C++ headers/libs
+#   set 2nd to dir containing personal cross development headers/libs
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX} ~/crossdev/w32)
+
+# modify default behavior of FIND_XXX() commands to
+# search for headers/libs in the target environment and
+# search for programs in the build host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/cmake/Toolchain-OSX-mingw32.cmake.sample b/cmake/Toolchain-OSX-mingw32.cmake.sample
new file mode 100644
index 000000000..4926645e7
--- /dev/null
+++ b/cmake/Toolchain-OSX-mingw32.cmake.sample
@@ -0,0 +1,32 @@
+# Sample toolchain file for building for Windows from an OS X system.
+#
+# Typical usage:
+#    1) install a mingw-w64 cross compiler
+#       a) darwin toolchain targeting win32: http://sourceforge.net/projects/mingw-w64/files/Toolchains targetting Win32/
+#       b) extract toolchain into ~/mingw/w32
+#    2) cp cmake/Toolchain-OSX-mingw32.cmake.sample ~/Toolchain-OSX-mingw32.cmake
+#    3) tweak toolchain values as needed
+#    4) cd build
+#    5) cmake -DCMAKE_TOOLCHAIN_FILE=~/Toolchain-OSX-mingw32.cmake ..
+
+# name of the target OS on which the built artifacts will run
+# and the toolchain prefix
+set(CMAKE_SYSTEM_NAME Windows)
+set(TOOLCHAIN_PREFIX i686-w64-mingw32)
+
+# cross compilers to use for C and C++
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+
+# target environment(s) on the build host system
+#   set 1st to dir with the cross compiler's C/C++ headers/libs
+#   set 2nd to dir containing personal cross development headers/libs
+set(CMAKE_FIND_ROOT_PATH ~/mingw/w32/${TOOLCHAIN_PREFIX} ~/crossdev/w32)
+
+# modify default behavior of FIND_XXX() commands to
+# search for headers/libs in the target environment and
+# search for programs in the build host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/cmake/Toolchain-Ubuntu-mingw32.cmake.sample b/cmake/Toolchain-Ubuntu-mingw32.cmake.sample
new file mode 100644
index 000000000..adc24e501
--- /dev/null
+++ b/cmake/Toolchain-Ubuntu-mingw32.cmake.sample
@@ -0,0 +1,30 @@
+# Sample toolchain file for building for Windows from an Ubuntu Linux system.
+#
+# Typical usage:
+#    1) install cross compiler: `sudo apt-get install mingw-w64 g++-mingw-w64`
+#    2) cp cmake/Toolchain-Ubuntu-mingw32.cmake.sample ~/Toolchain-Ubuntu-mingw32.cmake
+#    3) tweak toolchain values as needed
+#    4) cd build
+#    5) cmake -DCMAKE_TOOLCHAIN_FILE=~/Toolchain-Ubuntu-mingw32.cmake ..
+
+# name of the target OS on which the built artifacts will run
+# and the toolchain prefix
+set(CMAKE_SYSTEM_NAME Windows)
+set(TOOLCHAIN_PREFIX i686-w64-mingw32)
+
+# cross compilers to use for C and C++
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+
+# target environment on the build host system
+#   set 1st to dir with the cross compiler's C/C++ headers/libs
+#   set 2nd to dir containing personal cross development headers/libs
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX} ~/crossdev/w32)
+
+# modify default behavior of FIND_XXX() commands to
+# search for headers/libs in the target environment and
+# search for programs in the build host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/cmake/modules/IntrospectSystem.cmake b/cmake/modules/IntrospectSystem.cmake
new file mode 100644
index 000000000..e148563fa
--- /dev/null
+++ b/cmake/modules/IntrospectSystem.cmake
@@ -0,0 +1,52 @@
+# system capabilities checking
+
+# initial system defaults
+if(CMAKE_COMPILER_IS_GNUCC)
+  set(MRUBY_DEFAULT_CFLAGS "-Wall -Werror-implicit-function-declaration")
+  set(CMAKE_C_FLAGS "${MRUBY_DEFAULT_CFLAGS}")
+  set(CMAKE_C_FLAGS_DEBUG "-O3 -ggdb")
+  set(CMAKE_C_FLAGS_MINSIZEREL "-Os -DNDEBUG")
+  set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O3 -g")
+  set(CMAKE_C_FLAGS_RELEASE "-O3 -DNDEBUG")
+
+  set(MRUBY_LIBS m)
+else()
+  if(MSVC)
+    # TODO default MSVC flags
+    add_definitions(
+      -D_CRT_SECURE_NO_WARNINGS
+      -wd4018  # suppress 'signed/unsigned mismatch'
+      )
+  endif()
+endif()
+
+if(MSVC)
+  add_definitions(
+    -DRUBY_EXPORT   # required by oniguruma.h
+    )
+endif()
+
+
+# include helpers
+include(CheckIncludeFile)
+include(CheckSymbolExists)
+
+# header checks
+CHECK_INCLUDE_FILE(string.h HAVE_STRING_H)
+if(HAVE_STRING_H)
+  add_definitions(-DHAVE_STRING_H)
+endif()
+
+CHECK_INCLUDE_FILE(float.h HAVE_FLOAT_H)
+if(HAVE_FLOAT_H)
+  add_definitions(-DHAVE_FLOAT_H)
+endif()
+
+
+# symbol checks
+CHECK_SYMBOL_EXISTS(gettimeofday sys/time.h HAVE_GETTIMEOFDAY)
+if(NOT HAVE_GETTIMEOFDAY)
+  add_definitions(-DNO_GETTIMEOFDAY)
+endif()
+
+# vim: ts=2 sts=2 sw=2 et