Re: [PATCH v2 2/2] LoongArch: When the code model is extreme, the symbol address is obtained through macro instructions regardless of the value of -mexplicit-relocs.

[Xi Ruoyao <xry111@xry111.site>]

在 2024-01-13星期六的 15:01 +0800，chenglulu写道：
> 
> 在 2024/1/12 下午7:42, Xi Ruoyao 写道:
> > 在 2024-01-12星期五的 09:46 +0800，chenglulu写道：
> > 
> > > > I found an issue bootstrapping GCC with -mcmodel=extreme in BOOT_CFLAGS:
> > > > we need a target hook to tell the generic code
> > > > UNSPEC_LA_PCREL_64_PART{1,2} are just a wrapper around symbols, or we'll
> > > > see millions lines of messages like
> > > > 
> > > > ../../gcc/gcc/tree.h:4171:1: note: non-delegitimized UNSPEC
> > > > UNSPEC_LA_PCREL_64_PART1 (42) found in variable location
> > > I build GCC with -mcmodel=extreme in BOOT_CFLAGS, but I haven't reproduced the problem you mentioned.
> > > 
> > >      $ ../configure --host=loongarch64-linux-gnu --target=loongarch64-linux-gnu --build=loongarch64-linux-gnu \
> > >          --with-arch=loongarch64 --with-abi=lp64d --enable-tls --enable-languages=c,c++,fortran,lto --enable-plugin \
> > >          --disable-multilib --disable-host-shared --enable-bootstrap --enable-checking=release
> > >      $ make BOOT_FLAGS="-mcmodel=extreme"
> > > 
> > > What did I do wrong?:-(
> > BOOT_CFLAGS, not BOOT_FLAGS :).
> > 
> This is so strange. My compilation here stopped due to syntax problems,
> 
> and I still haven't reproduced the information you mentioned about 
> UNSPEC_LA_PCREL_64_PART1.

I used:

../gcc/configure --with-system-zlib --disable-fixincludes \
                 --enable-default-ssp --enable-default-pie \
                 --disable-werror --disable-multilib \
                 --prefix=/home/xry111/gcc-dev

and then

make STAGE1_{C,CXX}FLAGS="-O2 -g" -j8 \
     BOOT_{C,CXX}FLAGS="-O2 -g -mcmodel=extreme" &| tee gcc-build.log

I guess "-g" is needed to reproduce the issue as well as the messages
were produced in dwarf generation.

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University