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4.8 GCC, Strict Aliasing=3, -O3 CFLAG, Opt Flags!!
For those of you who are building cm-11.0 with the neofy script, none of this stuff applies to you as the script did it all for you ;) To everyone else: With this commit, you will be heavily modifying your build environment. What this will do, is allow you the freedom of using any custom toolchain of your choice, provided you follow two simple rules: RULE SlimRoms#1: Both the androideabi and armeabi toolchain folders of your choice HAVE to be named like the following: for androideabi, the folder has to be prefixed with: arm-linux-androideabi- and for arm-eabi, the folder has to be prefixed with: arm-eabi- ex: If you want to use GCC-4.8 as your toolchain of choice, both the androideabi and armeabi folders have to look like this: arm-linux-androideabi-4.8 arm-eabi-4.8 if you want them to be different, say, 4.8 for the arm-eabi and 4.9 for androideabi, then they should look like this: arm-eabi-4.8 arm-linux-androideabi-4.9 Take note, that if usining linaro, you will have to clone in the toolchain twice as this method requires two different folders (the way it should be IMO). You would need to rename one of the clones to arme-abi- and the other to arm-linux-androideabi-. SECTION 2 RULE SlimRoms#2: The default configuration I've set is to build with GCC 4.8 for androideabi and 4.8 for armeabi by default (in core/combo/TARGET_linux-arm.mk lines 50-51) unless you specify an alternate target chain on those two lines! So if you want to use a different chain, you'll need to change the build numbers on those two lines. for Example: Say you wanted to use a 4.7 chain instead for armeabi and 4.8 for androideabi.. You would change lines 50 and 51 to the following: TARGET_GCC_VERSION_ARM := 4.7 TARGET_GCC_VERSION_AND := 4.8 Notice at the end of each line one is for ARM and one is for AND which hints at armeabi and androideabi and the only thing you're changing is the number. You also need to make sure rule number 1 is observed if you do this.. Can't build with an alternate chain if one is not present ;) Personally, I've found the following two toolchains to be the best without any drawback to rom (sans ART) courtesy of sparksco: https://github.com/SaberMod/android_prebuilts_gcc_linux-x86_arm_sabermod-arm-eabi-4.8 https://github.com/SaberMod/android_prebuilts_gcc_linux-x86_arm_sabermod-arm-linux-androideabi-4.8 MAKE SURE YOU PULL BOTH FROM THE sm-kk-mr1 BRANCH IF YOU DECIDE TO USE THESE CHAINS! This build commit also changes your global compiler ARM flags to -O3. -O3 is an option that enables all -O1 and -O2 flag options as well as some heavy -O3 flag options that build for optimized performance! This commit also adds a few optimization flags that I've pre-selected for added performance. This commit also builds the entire rom using a Strict Aliasing rule set at the highest level of =3 and set to error on every strict aliasing issue. Make sure that you have all the proper strict aliasing commits needed! If you can't find them, they will be available to you on my github account at https://github.com/IAmTheOneTheyCallNeo to make your search for all those needed easier, you can find all of them in the following script: https://github.com/vigor/android/blob/cm-11.0/neofy.sh Contact me if you have any issues and I will help you when and if I can. -Neo
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,43 @@ | ||
| # The try-run, cc-version, cc-ifversion and cc-option macros are inspired | ||
| # by the Linux kernel build system's versions of the macros with the same | ||
| # name. | ||
| # | ||
| # The implementations here are rewritten to avoid license clashes, and | ||
| # they're a lot simpler than their kernel counterparts because, at least | ||
| # for now, we don't need to support all the compilers the kernel supports, | ||
| # and we don't need to be aware of all the details the kernel checks for. | ||
| # | ||
| # Usage examples: | ||
| # echo "GCC version $(cc-version)" [e.g. 47 for 4.7] | ||
| # echo $(call cc-ifversion, -lt, 47, GCC older than 4.7) | ||
| # # Use -mcpu=cortex-a9 if supported, otherwise -mcpu=cortex-a8 | ||
| # echo $(call cc-option, -mcpu=cortex-a9, -mcpu=cortex-a8) | ||
| # # Use -mcpu=cortex-a9 if supported, otherwise -mcpu=cortex-a8 | ||
| # # if supported, otherwise nothing | ||
| # echo $(call cc-option, -mcpu=cortex-a9, $(call cc-option, -mcpu=cortex-a8)) | ||
| # | ||
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| # We have to do our own version of setting TARGET_CC because we can be | ||
| # included before TARGET_CC is set, but we may want to use cc-option and | ||
| # friends in the same file that sets TARGET_CC... | ||
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| ifeq ($(strip $(TARGET_TOOLS_PREFIX)),) | ||
| LINARO_COMPILERCHECK_CC := prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-$(TARGET_GCC_VERSION_AND)/bin/arm-linux-androideabi-gcc$(HOST_EXECUTABLE_SUFFIX) | ||
| else | ||
| LINARO_COMPILERCHECK_CC := $(TARGET_TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX) | ||
| endif | ||
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| try-run = $(shell set -e; \ | ||
| if ($(1)) >/dev/null 2>&1; then \ | ||
| echo "$(2)"; \ | ||
| else \ | ||
| echo "$(3)"; \ | ||
| fi) | ||
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| cc-version = $(shell echo '__GNUC__ __GNUC_MINOR__' \ | ||
| |$(LINARO_COMPILERCHECK_CC) -E -xc - |tail -n1 |sed -e 's, ,,g') | ||
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| cc-ifversion = $(shell [ $(call cc-version) $(1) $(2) ] && echo $(3)) | ||
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| cc-option = $(call try-run, echo -e "$(1)" \ | ||
| |$(LINARO_COMPILERCHECK_CC) $(1) -c -xc /dev/null -o /dev/null,$(1),$(2)) |
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