Some notes on getting NaCl working. Of course, things didn’t work out-of-the box.
Install nacl_sdk
Grab and follow the instructions here:
https://developer.chrome.com/native-client/sdk/download
i.e. download and do the following:
Install 32bit Headers
‘cmon, everybody runs 64bit Linux these days (in my case Ubuntu 14.04 64bit). You need the 32bit libraries for anything to build though.
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sudo apt-get install libc6:i386 libstdc++6:i386 |
Source: http://stackoverflow.com/questions/23661718/native-client-tutorial-cant-find-libstdc
Follow Tutorial
‘make serve’ will now work.
https://developer.chrome.com/native-client/devguide/tutorial/tutorial-part1
Test2 probably wont run though. I haven’t checked, but I think it may not be a pnacl file (pnacl is necessary to run in a stock Chrome).
EDIT: The problem with Test2 is that newlib is the first Toolchain. If you modify the Makefile by making pnacl the first VALID_TOOLCHAINS (or commenting out the line entirely), and change index.html, the data-tools attribute of the body tag, make pnacl first, it will work correctly.
Now, lets see how far we get compiling SDL NaCL.
Set Environment Variables for SDL
Reference: https://hg.libsdl.org/SDL/file/ae720d61d14d/README-nacl.txt
Do something like the following.
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export NACL_SDK_ROOT=`readlink -f ../nacl_sdk/pepper_35/` export CFLAGS="$CFLAGS -I$NACL_SDK_ROOT/include" export CC="$NACL_SDK_ROOT/toolchain/linux_pnacl/bin/pnacl-clang" export AR="$NACL_SDK_ROOT/toolchain/linux_pnacl/bin/pnacl-ar" export LD="$NACL_SDK_ROOT/toolchain/linux_pnacl/bin/pnacl-ar" export RANLIB="$NACL_SDK_ROOT/toolchain/linux_pnacl/bin/pnacl-ranlib" |
‘readlink -f’ takes a path and converts it in to an absolute path (by following symlinks, ..’s, etc). If you’re on Windows, substitute it for the absolute path to your pepper directory. Mine is /home/mike/Work/Build/nacl_sdk/pepper_35
And of course, edit your pepper version accordingly (35 or whatever).
Build SDL2 in NaCL mode
SDL must be built outside the main SDL directory. I like to call my SDL directory “SDL2”, and do builds in directories like “SDLBuild”. I invoke my build like follows:
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../SDL2/configure --host=pnacl --prefix `readlink -f $NACL_SDK_ROOT/SDL` make make install |
Notably, I’m putting the output (make install) inside the SDL subdirectory of the pepper SDK folder.
The Makefile
EDIT: For the makefile to work, I had to make a few changes. Here is the full modified makefile.
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# Copyright (c) 2013 The Chromium Authors. All rights reserved. # Use of this source code is governed by a BSD-style license that can be # found in the LICENSE file. # GNU Makefile based on shared rules provided by the Native Client SDK. # See README.Makefiles for more details. VALID_TOOLCHAINS := pnacl # NACL_SDK_ROOT ?= $(abspath $(CURDIR)/../../..) include $(NACL_SDK_ROOT)/tools/common.mk TARGET = sdl_app DEPS = ppapi_simple nacl_io # ppapi_simple and SDL2 end up being listed twice due to dependency solving issues -- Gabriel LIBS = SDL2_test SDL2 ppapi_simple SDL2main SDL2 $(DEPS) ppapi_gles2 ppapi_cpp ppapi pthread CFLAGS := -Wall -I$(NACL_SDK_ROOT)/SDL/include/SDL2 SOURCES ?= ../testgles2.c PNACL_LDFLAGS += -L$(NACL_SDK_ROOT)/SDL/lib # Build rules generated by macros from common.mk: # Overriden macro from NACL SDK to be able to customize the library search path -- Gabriel # Specific Link Macro # # $1 = Target Name # $2 = List of inputs # $3 = List of libs # $4 = List of deps # $5 = List of lib dirs # $6 = Other Linker Args # # For debugging, we translate the pre-finalized .bc file. # define LINKER_RULE all: $(1).pexe $(1)_x86_32.nexe : $(1).bc $(call LOG,TRANSLATE,$$@,$(PNACL_TRANSLATE) --allow-llvm-bitcode-input -arch x86-32 $$^ -o $$@) $(1)_x86_64.nexe : $(1).bc $(call LOG,TRANSLATE,$$@,$(PNACL_TRANSLATE) --allow-llvm-bitcode-input -arch x86-64 $$^ -o $$@) $(1)_arm.nexe : $(1).bc $(call LOG,TRANSLATE,$$@,$(PNACL_TRANSLATE) --allow-llvm-bitcode-input -arch arm $$^ -o $$@) $(1).pexe: $(1).bc $(call LOG,FINALIZE,$$@,$(PNACL_FINALIZE) -o $$@ $$^) $(1).bc: $(2) $(foreach dep,$(4),$(STAMPDIR)/$(dep).stamp) $(call LOG,LINK,$$@,$(PNACL_LINK) -o $$@ $(2) $(PNACL_LDFLAGS) $(foreach path,$(5),-L$(path)/pnacl/$(CONFIG)) -L./lib $(foreach lib,$(3),-l$(lib)) $(6)) endef $(foreach dep,$(DEPS),$(eval $(call DEPEND_RULE,$(dep)))) $(foreach src,$(SOURCES),$(eval $(call COMPILE_RULE,$(src),$(CFLAGS)))) ifeq ($(CONFIG),Release) $(eval $(call LINK_RULE,$(TARGET)_unstripped,$(SOURCES),$(LIBS),$(DEPS))) $(eval $(call STRIP_RULE,$(TARGET),$(TARGET)_unstripped)) else $(eval $(call LINK_RULE,$(TARGET),$(SOURCES),$(LIBS),$(DEPS))) endif $(eval $(call NMF_RULE,$(TARGET),)) serve: all $(HTTPD_PY) -C $(CURDIR) --no-dir-check |
The changes are lines 19 and 20. Line 22 is new, as are lines 67 and 68. The last 2 lines are a hack to make “make serve” work the same as it does in the NaCl demos.
Here’s a diff.
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--- a/test/nacl/Makefile Fri Jun 13 14:52:26 2014 -0400 +++ b/test/nacl/Makefile Sat Jun 14 13:44:39 2014 -0400 @@ -16,8 +16,10 @@ # ppapi_simple and SDL2 end up being listed twice due to dependency solving issues -- Gabriel LIBS = SDL2_test SDL2 ppapi_simple SDL2main SDL2 $(DEPS) ppapi_gles2 ppapi_cpp ppapi pthread -CFLAGS := -Wall -SOURCES ?= testgles2.c +CFLAGS := -Wall -I$(NACL_SDK_ROOT)/SDL/include/SDL2 +SOURCES ?= ../testgles2.c + +PNACL_LDFLAGS += -L$(NACL_SDK_ROOT)/SDL/lib # Build rules generated by macros from common.mk: # Overriden macro from NACL SDK to be able to customize the library search path -- Gabriel @@ -61,3 +63,6 @@ endif $(eval $(call NMF_RULE,$(TARGET),)) + +serve: all + $(HTTPD_PY) -C $(CURDIR) --no-dir-check |
For reference, my old notes (before I got it working by changing the makefile):
Okay, this didn’t actually work. I’m not sure exactly how it’s supposed to be configured, but it’s not configured correctly. It should only be used as a reference. Some other notes of things I had to do to get it to work:
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export C_INCLUDE_PATH=$NACL_SDK_ROOT/../SDL/include/SDL2 $C_INCLUDE_PATH export CPLUS_INCLUDE_PATH=$NACL_SDK_ROOT/../SDL/include/SDL2 $CPLUS_INCLUDE_PATH export LIBRARY_PATH=$NACL_SDK_ROOT/../SDL/lib $LIBRARY_PATH Use CPATH instead of C_INCLUDE_PATH and CPLUS_INCLUDE_PATH. It's both. |
naclbuild script
Alternatively, once the environment is set correctly (I think just NACL_SDK_ROOT) it’ll work. In the ‘build-tools’ folder is a script ‘naclbuild’. Run that, and it’ll put some output in the Build folder. Once it finishes, it gives you a string to copy+paste in to your shell. Do it.
Vine Videos: https://vine.co/v/MDnA1x9aPMe, https://vine.co/v/MDn6I6UFWPF
Currently works on Desktop Chrome, and Chrome OS. Will not work on Android (yet).
