Hello Sahaj,

On Fri, Feb 16, 2024 at 5:50 AM Sahaj Sarup sahaj.sarup@linaro.org wrote:

Hi all,

Since commit f8cebb4f789c9950caf55a0b73e88049e7a1c3a3 enabled LTO by default for imx8m platforms, I have been having issues building u-boot. I am primarily working on imx8mp instead of imx8mm platforms so the bug resolved by that commit doesn't affect me yet. But I guess it's a generic issue with u-boot's LTO requirements and GCC 13.

Build log:

  LTO     u-boot
/usr/bin/aarch64-linux-gnu-ld:
/usr/lib/gcc/aarch64-linux-gnu/13/libgcc.a(lse-init.o): in function
`init_have_lse_atomics':
/builddir/build/BUILD/gcc-13.2.1-20230728/aarch64-linux-gnu/aarch64-linux-gnu/libgcc/../../../gcc-13.2.1-20230728/libgcc/config/aarch64/lse-init.c:46:
undefined reference to `__getauxval'
collect2: fatal error: ld terminated with signal 11 [Segmentation
fault], core dumped
compilation terminated.
make: *** [Makefile:1766: u-boot] Error 1
make: *** Deleting file 'u-boot'

GCC Version:

$ aarch64-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/aarch64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/aarch64-linux-gnu/13/lto-wrapper
Target: aarch64-linux-gnu
Configured with: ../gcc-13.2.1-20230728/configure --bindir=/usr/bin
--build=x86_64-redhat-linux-gnu --datadir=/usr/share --disable-
decimal-float --disable-dependency-tracking --disable-gold
--disable-libgcj --disable-libgomp --disable-libmpx
--disable-libquadmat
h --disable-libssp --disable-libunwind-exceptions --disable-shared
--disable-silent-rules --disable-sjlj-exceptions --disable-threa
ds --with-ld=/usr/bin/aarch64-linux-gnu-ld --enable-__cxa_atexit
--enable-checking=release --enable-gnu-unique-object --enable-init
fini-array --enable-languages=c,c++ --enable-linker-build-id
--enable-lto --enable-nls --enable-obsolete --enable-plugin --enable-t
argets=all --exec-prefix=/usr --host=x86_64-redhat-linux-gnu
--includedir=/usr/include --infodir=/usr/share/info --libexecdir=/usr/
libexec --localstatedir=/var --mandir=/usr/share/man --prefix=/usr
--program-prefix=aarch64-linux-gnu- --sbindir=/usr/sbin --shared
statedir=/var/lib --sysconfdir=/etc --target=aarch64-linux-gnu
--with-bugurl=http://bugzilla.redhat.com/bugzilla/ --with-gcc-major-
version-only --with-isl --with-newlib
--with-plugin-ld=/usr/bin/aarch64-linux-gnu-ld
--with-sysroot=/usr/aarch64-linux-gnu/sys-root
--with-system-libunwind --with-system-zlib --without-headers
--enable-gnu-indirect-function --with-linker-hash-style=gnu
Thread model: single
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.1 20230728 (Red Hat Cross 13.2.1-1) (GCC)

Thanks, Sahaj Sarup

This might be related [1] (try tocompile with -mno-outline-atomics):

"GCC 10.1.0 introduced the -moutline-atomics option which, when enabled, use LSE instructions when the processor provides them. The option is enabled by default and unfortunately causes the following error at compile time:

aarch64-linux-gnu-ld: /usr/lib/gcc/aarch64-linux-gnu/10.1.0/libgcc.a(lse-init.o): in function `init_have_lse_atomics': lse-init.c:(.text.startup+0xc): undefined reference to `__getauxval'

This is happening because we are linking against our own libcflat which doesn't implement the function __getauxval().

Disable the use of the out-of-line functions by compiling with -mno-outline-atomics."

[1] https://patchwork.kernel.org/project/kvm/patch/20200728121751.15083-1-drjone...