From cfcd478fe69ca1b3923f388a349a4f67ac2c03aa Mon Sep 17 00:00:00 2001
From: Shawn Anastasio <shawn@anastas.io>
Date: Sun, 3 Feb 2019 13:22:57 -0600
Subject: [PATCH] Fix build on PowerPC

On PowerPC-based architectures, SDL includes the altivec.h header
for SIMD intrinsics. Unfortunately, altivec.h defines some types which
conflict with C++ types like bool and std::vector. This commit adds
a wrapper for altivec.h which resolves these conflicts and allows
supertux to build and run.

Tested on a ppc64le workstation.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved from:
https://github.com/SuperTux/supertux/pull/1056/commits/cfcd478fe69ca1b3923f388a349a4f67ac2c03aa]
---
 CMakeLists.txt    | 15 ++++++++++++++-
 src/ppc/altivec.h |  6 ++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 src/ppc/altivec.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 70b9673b50..b9b6ea3ea6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -376,6 +376,11 @@ endif()
 
 include(ConfigureChecks)
 
+# Include altivec wrapper on ppc
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc.*")
+  include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/ppc)
+endif()
+
 
 ## Also build external/squirrel
 
@@ -420,6 +425,13 @@ if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/external/tinygettext/CMakeLists.txt)
   message(FATAL_ERROR "tinygettext submodule is not checked out or ${CMAKE_CURRENT_SOURCE_DIR}/external/tinygettext/CMakeLists.txt is missing")
 endif()
 
+# Include altivec wrapper on ppc
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc.*")
+  set(TINYGETTEXT_CXX_FLAGS "-isystem ${CMAKE_CURRENT_SOURCE_DIR}/src/ppc ${CMAKE_CXX_FLAGS}")
+else()
+  set(TINYGETTEXT_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+endif()
+
 set(TINYGETTEXT_PREFIX ${CMAKE_BINARY_DIR}/tinygettext/)
 ExternalProject_Add(tinygettext
   SOURCE_DIR "${CMAKE_SOURCE_DIR}/external/tinygettext/"
@@ -428,7 +440,7 @@ ExternalProject_Add(tinygettext
   -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
   -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
   -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-  -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+  -DCMAKE_CXX_FLAGS=${TINYGETTEXT_CXX_FLAGS}
   -DBUILD_SHARED_LIBS=OFF
   -DHAVE_SDL=ON
   -DVCPKG_BUILD=${VCPKG_BUILD}
@@ -443,6 +455,7 @@ set_target_properties(tinygettext_lib PROPERTIES IMPORTED_LOCATION "${TINYGETTEX
 
 include_directories(SYSTEM ${TINYGETTEXT_PREFIX}/include)
 
+
 ## external/SDL_ttf with patches
 find_package(Freetype REQUIRED)
 find_package(RAQM)
diff --git a/src/ppc/altivec.h b/src/ppc/altivec.h
new file mode 100644
index 0000000000..7ede8246ed
--- /dev/null
+++ b/src/ppc/altivec.h
@@ -0,0 +1,6 @@
+#include_next <altivec.h>
+
+// The altivec headers redefine vector and bool which conflict
+// with C++'s bool type and std::vector. Undefine them here.
+#undef vector
+#undef bool