From fa540a3af8a5ad3d201223aa0baf26819437e108 Mon Sep 17 00:00:00 2001
From: Allen Byrne <byrn@hdfgroup.org>
Date: Thu, 29 Aug 2019 10:36:12 -0500
Subject: Add 32-bit cross-compile toolchain

---
 MANIFEST                       |  1 +
 config/toolchain/build32.cmake | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 config/toolchain/build32.cmake

diff --git a/MANIFEST b/MANIFEST
index 1232411..622c339 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -3263,6 +3263,7 @@
 ./java/lib/ext/slf4j-simple-1.7.25.jar
 
 # CMake-specific Files
+./config/toolchain/build32.cmake
 ./config/toolchain/crayle.cmake
 ./config/toolchain/GCC.cmake
 ./config/toolchain/intel.cmake
diff --git a/config/toolchain/build32.cmake b/config/toolchain/build32.cmake
new file mode 100644
index 0000000..99b3013
--- /dev/null
+++ b/config/toolchain/build32.cmake
@@ -0,0 +1,37 @@
+if (WIN32)
+  set (CMAKE_SYSTEM_NAME Windows)
+  set (CMAKE_GENERATOR_PLATFORM "x86")
+else ()
+  set (CMAKE_SYSTEM_NAME Linux)
+
+  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32 -msse2" CACHE STRING "c++ flags")
+  set (CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -m32 -msse2" CACHE STRING "c flags")
+
+  set (LIB32 /usr/lib) # Fedora
+
+  if (EXISTS /usr/lib32)
+    set (LIB32 /usr/lib32) # Arch, Solus
+  endif ()
+
+  set (CMAKE_SYSTEM_LIBRARY_PATH ${LIB32} CACHE STRING "system library search path" FORCE)
+  set (CMAKE_LIBRARY_PATH        ${LIB32} CACHE STRING "library search path"        FORCE)
+
+  # this is probably unlikely to be needed, but just in case
+  set (CMAKE_EXE_LINKER_FLAGS    "-m32 -L${LIB32}" CACHE STRING "executable linker flags"     FORCE)
+  set (CMAKE_SHARED_LINKER_FLAGS "-m32 -L${LIB32}" CACHE STRING "shared library linker flags" FORCE)
+  set (CMAKE_MODULE_LINKER_FLAGS "-m32 -L${LIB32}" CACHE STRING "module linker flags"         FORCE)
+
+  # on Fedora and Arch and similar, point pkgconfig at 32 bit .pc files. We have
+  # to include the regular system .pc files as well (at the end), because some
+  # are not always present in the 32 bit directory
+  if (EXISTS ${LIB32}/pkgconfig)
+    set (ENV{PKG_CONFIG_LIBDIR} ${LIB32}/pkgconfig:/usr/share/pkgconfig:/usr/lib/pkgconfig:/usr/lib64/pkgconfig)
+  endif ()
+# where is the target environment
+  set (CMAKE_FIND_ROOT_PATH ${LIB32})
+# search for programs in the build host directories
+  set (CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+# for libraries and headers in the target directories
+  set (CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+  set (CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif ()
\ No newline at end of file
-- 
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