# HG changeset patch
# User Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
# Date 1595081760 14400
# Node ID 59a473863eaaa6dd44220c626901afb4c862e0dc
# Parent  64ad3a9d4837a4f4d5c6e2c854ef512370537deb
cmake: add a way to force 64-bit build

This is useful on OSes that support 64-bit binaries but default to 32-bit.

To force 64-bits, pass FORCE_64_BIT_BUILD to cmake.  E.g.,

	$ cmake . -DFORCE_64_BIT_BUILD=1

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

diff -r 64ad3a9d4837 -r 59a473863eaa CMakeLists.txt
--- a/CMakeLists.txt	Sat Jul 18 11:05:33 2020 -0400
+++ b/CMakeLists.txt	Sat Jul 18 10:16:00 2020 -0400
@@ -49,6 +49,7 @@
 
 set(CMAKE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
+include(cmake/64-bit.cmake)
 include(cmake/config.cmake)
 include(cmake/mapfile.cmake)
 include(cmake/test.cmake)
diff -r 64ad3a9d4837 -r 59a473863eaa cmake/64-bit.cmake
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cmake/64-bit.cmake	Sat Jul 18 10:16:00 2020 -0400
@@ -0,0 +1,32 @@
+#
+# Copyright (c) 2020 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+
+if(FORCE_64_BIT_BUILD)
+	message("-- Forcing 64-bit build")
+	set(CMAKE_EXE_LINKER_FLAGS "-m64")
+	set(CMAKE_SHARED_LINKER_FLAGS "-m64")
+	add_compile_options(-m64)
+
+	# necessary for check_type_size, etc.
+	set(CMAKE_REQUIRED_FLAGS "-m64")
+	set(CMAKE_REQUIRED_LINK_OPTIONS "-m64")
+endif()