Originally Posted by NiLuJe
@Kai771: Try with -mtune set, if it wasn't already done... It should be overriden by -march, but who knows...
Yeah, already tried... no go.
I took another look at Makefile, but couldn't find any more places where *FLAGS were not passed down.
I then went to Linaro site, and downloaded 2012.04 binaries
(the last ones for gnueabi - the newer ones are all gnueabihf). I got the same results as with Ubunutu's Linaro. (Not really surprising... gcc -Q -v gave this:
GNU C (crosstool-NG linaro-1.13.1-2012.04-20120426 - Linaro GCC 2012.04) version 4.7.1 20120402 (prerelease) (arm-linux-gnueabi)
compiled by GNU C version 4.1.3 20080704 (prerelease) (Ubuntu 4.1.2-27ubuntu1), GMP version 5.0.2, MPFR version 3.1.0, MPC version 0.9
Linaro 2012.04 needs -D_GNU_SOURCE (GLIBC_2.7 error without it). It has -mtls-dialect=gnu in it's COLLECT_GCC_OPTIONS - so that's not it either.
The settings I used are supposed to override any problematic defaults:
CFLAGS:=-O3 -fno-stack-protector -U_FORTIFY_SOURCE -D_GNU_SOURCE $(SYSROOT)
CXXFLAGS:=-O3 -fno-stack-protector -U_FORTIFY_SOURCE -fno-use-cxa-atexit $(SYSROOT)
ARM_CFLAGS:=-march=armv6j -mtune=arm1136jf-s -marm -mfloat-abi=softfp -mfpu=vfp
but it doesn't work - Segmentation fault.
Both Linaro 2012.04 and Ubuntu Linaro use -imultilib and -imultiarch, so they might be the problem. None of the other TCs I tried (and NiLuJe's version) use it.
In the end, I compiled hello.c with 2012.04 using
arm-linux-gnueabi-gcc -O3 -fno-stack-protector -U_FORTIFY_SOURCE -D_GNU_SOURCE -march=armv6j -mtune=arm1136jf-s -marm -mfloat-abi=softfp -mfpu=vfp hello.c -o hello
and tried running it on Kindle. Yeah, you guessed it - Segmentation fault.
I'm now of the opinion that Linaro/Ubuntu somehow compile their TC in a way that makes them incompatible with Kindle 3, and that switches won't fix it. (Disclaimer: Noob's opinion - possibly wrong). If someone can prove it wrong, I'd really like to hear it.