On Sat, 29 May 2021, Gabriel Marcano via Gcc-help wrote:
> Here's the non-lto build:
> arm-none-eabi-gcc -O0 -g -Wl,-y,malloc,-v,-t -c -o main.o main.c
> arm-none-eabi-gcc -O0 -g -Wl,-y,malloc,-v,-t -c -o t1.o t1.c
> arm-none-eabi-gcc -O -g -Wl,-y,malloc,-v,-t main.o t1.o -o main
> collect2 version 11.1.0
> /usr/libexec/gcc/arm-none-eabi/ld -plugin
> /usr/libexec/gcc/arm-none-eabi/11.1.0/liblto_plugin.so
> -plugin-opt=/usr/libexec/gcc/arm-none-eabi/11.1.0/lto-wrapper
> -plugin-opt=-fresolution=/tmp/ccyt1CxF.res -plugin-opt=-pass-through=-lgcc
> -plugin-opt=-pass-through=-lg -plugin-opt=-pass-through=-lc
> --sysroot=/usr/arm-none-eabi -X -o main
> /usr/lib/gcc/arm-none-eabi/11.1.0/crti.o
> /usr/lib/gcc/arm-none-eabi/11.1.0/crtbegin.o
> /usr/lib/gcc/arm-none-eabi/11.1.0/../../../../arm-none-eabi/lib/crt0.o
> -L/usr/lib/gcc/arm-none-eabi/11.1.0
> -L/usr/lib/gcc/arm-none-eabi/11.1.0/../../../../arm-none-eabi/lib
> -L/usr/arm-none-eabi/lib -L/usr/arm-none-eabi/usr/lib -y malloc -v -t main.o
> t1.o --start-group -lgcc -lg -lc --end-group
> /usr/lib/gcc/arm-none-eabi/11.1.0/crtend.o
> /usr/lib/gcc/arm-none-eabi/11.1.0/crtn.o
> GNU ld (Gentoo 2.36.1 p3) 2.36.1
> /usr/lib/gcc/arm-none-eabi/11.1.0/crti.o
> /usr/lib/gcc/arm-none-eabi/11.1.0/crtbegin.o
> /usr/lib/gcc/arm-none-eabi/11.1.0/../../../../arm-none-eabi/lib/crt0.o
> main.o
> t1.o
> /usr/libexec/gcc/arm-none-eabi/ld: t1.o: reference to malloc
> /usr/lib/gcc/arm-none-eabi/11.1.0/libgcc.a
> /usr/lib/gcc/arm-none-eabi/11.1.0/../../../../arm-none-eabi/lib/libg.a
> /usr/libexec/gcc/arm-none-eabi/ld: lib_a-malloc.o (symbol from plugin): definition of malloc
So this line ("symbol from plugin")
> /usr/lib/gcc/arm-none-eabi/11.1.0/../../../../arm-none-eabi/lib/libc.a
> /usr/lib/gcc/arm-none-eabi/11.1.0/libgcc.a
> /usr/lib/gcc/arm-none-eabi/11.1.0/../../../../arm-none-eabi/lib/libg.a
> /usr/lib/gcc/arm-none-eabi/11.1.0/../../../../arm-none-eabi/lib/libc.a
> /usr/lib/gcc/arm-none-eabi/11.1.0/crtend.o
> /usr/lib/gcc/arm-none-eabi/11.1.0/crtn.o
> /tmp/ccHV3ALY.ltrans0.ltrans.o
> /usr/libexec/gcc/arm-none-eabi/ld: /tmp/ccHV3ALY.ltrans0.ltrans.o: definition of malloc
and this line (synthesized ltrans unit) indicate that your libc.a has LTO
bytecode.
How did that happen, did you build Newlib with -flto?
Alexander
