create our own gcc toolchain for compiling spc-gnu-docker

[henderkes]

To allow statically linking against libgomp, libstdc++ and so on in -static-pie builds.

Luckily this was super easy to do inside the spc-gnu-docker image itself:

yum install -y wget
wget https://ftp.gwdg.de/pub/misc/gcc/releases/gcc-14.2.0/gcc-14.2.0.tar.gz
tar xzf gcc-14.2.0.tar.gz
cd gcc-14.2.0
./contrib/download_prerequisites
cd ..
mkdir objdir
cd objdir
$PWD/../gcc-14.2.0/configure   --prefix=$HOME/GCC-14   --enable-languages=c,c++,go   --enable-default-pie   --enable-default-ssp   --enable-shared   --enable-static   --enable-threads=posix   CFLAGS="-O2 -fPIC -fPIE -g0 -static-libgcc"   CXXFLAGS="-O2 -fPIC -fPIE -g0 -static-libgcc -static-libstdc++" --disable-multilib
make -j4
make install

[henderkes]

This might actually be a lot more complex because apparently with gcc 11 there was a glibcxx versioning bump in the stdc++ init code, requiring a more recent glibcxx version than installed by default.

I'm trying to patch the libstdc++ gnu.ver to possibly get around that, but we'll have to see how much success I have with it.

If that doesn't succeed we'd have to fumble around with LD_PRELOAD path or build a gcc 10.

[henderkes]

Okay I gave up on gcc 11+.

wget https://ftp.gnu.org/gnu/gcc/gcc-10.2.0/gcc-10.2.0.tar.gz
tar -xzf gcc-10.2.0.tar.gz
mkdir objdir
cd objdir
../gcc-10.2.0/configure  \
  --prefix=/opt/gcc10 \
  --enable-languages=c,c++ \
  --disable-multilib  \
  --enable-default-pie \
  --enable-default-ssp  \
  --enable-shared  \
  --enable-static \
  --enable-threads=posix  \
  --without-system-zlib \
  CFLAGS="-O2 -fPIC -fPIE -g0"  \
  CXXFLAGS="-O2 -fPIC -fPIE -g0"
make -j10
make install

Works fine.

[crazywhalecc]

Luckily this was super easy to do inside the spc-gnu-docker image itself

But it builds too slow. My M3 Pro mac with arm docker needs at least 15min. Publishing pre-built content is more reasonable.

[henderkes]

Yes of course it has to be published. I'm still working on this as there are some issues with compilation. We might also have to compile binutils for ld.

[henderkes]

Updating build process:

# gcc 
../gcc-10.5.0/configure   --prefix=/usr/local/gcc10   --enable-bootstrap   --enable-languages=c,c++,fortran,lto   --enable-shared   --enable-static   --enable-threads=posix   --enable-checking=release   --disable-multilib   --with-system-zlib --with-zstd    --enable-default-pie   --enable-default-ssp   --disable-libunwind-exceptions   --enable-gnu-unique-object   --enable-linker-build-id   --with-gcc-major-version-only   --enable-plugin   --enable-initfini-array   --enable-gnu-indirect-function   --with-tune=generic   --with-arch_32=x86-64   --build=x86_64-redhat-linux   CFLAGS="-O2 -fPIC -fPIE -g0"   CXXFLAGS="-O2 -fPIC -fPIE -g0"
make -j6
make install

# binutils
../configure --prefix=/usr/local/gcc10 --disable-nls --enable-gold --enable-plugins CFLAGS=-O2 -g0 -fPIC -fPIE

Slight change:

[root@c9e2e42f3e89 opt]# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc10/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../gcc-10.5.0/configure \
  --prefix=/usr/local/gcc10 \
  --enable-bootstrap \
  --enable-languages=c,c++,fortran,lto \
  --enable-static \
  --enable-shared \
  --enable-threads=posix \
  --enable-checking=release \
  --disable-multilib \
  --with-zlib \
  --enable-default-pie \
  --enable-default-ssp \
  --disable-libunwind-exceptions \
  --enable-gnu-unique-object \
  --enable-linker-build-id \
  --with-gcc-major-version-only \
  --enable-initfini-array \
  --enable-plugins \
  --enable-gnu-indirect-function \
  --with-tune=generic \
  --with-arch_32=x86-64 \
  --build=x86_64-redhat-linux \
  --disable-libquadmath \
  --disable-libquadmath-support \
  --disable-nls \
  --with-pic \
  CFLAGS='-O2 -fPIC -fPIE -g0' \
  CXXFLAGS='-O2 -fPIC -fPIE -g0'
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.5.0 (GCC)
[root@c9e2e42f3e89 opt]# nano test.c
[root@c9e2e42f3e89 opt]# [root@c9e2e42f3e89 opt]# gcc test.c -o test
[root@c9e2e42f3e89 opt]# ./test
Success!
[root@c9e2e42f3e89 opt]# ldd ./test
        linux-vdso.so.1 =>  (0x00007fff66fca000)
        libc.so.6 => /lib64/libc.so.6 (0x00007f2077402000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f20777d0000)

[henderkes]

https://1drv.ms/u/s!An01mvqoV7kDmIB-znEVFfJzjQqceA?e=Ztreap

Works fine to compile static-php-cli at least. Also works to statically link libstdc++ with -static-pie so I'm hopeful it'll work for frankenphp.

Need to set COMPILER_PATH=/usr/local/gcc10 though as I haven't found an option to make gcc/g++ use the assembler from binutils I compiled by default.

echo 'CC=/usr/local/gcc10/bin/gcc' > /tmp/spc-gnu-docker.env
echo 'CXX=/usr/local/gcc10/bin/g++' >> /tmp/spc-gnu-docker.env
echo 'AR=/usr/local/gcc10/bin/ar' >> /tmp/spc-gnu-docker.env
echo 'AS=/usr/local/gcc10/bin/as' >> /tmp/spc-gnu-docker.env
echo 'LD=/usr/local/gcc10/bin/ld' >> /tmp/spc-gnu-docker.env
echo 'COMPILER_PATH=/usr/local/gcc10/bin' >> /tmp/spc-gnu-docker.env
echo 'LD_LIBRARY_PATH=/usr/local/gcc10/lib64' >> /tmp/spc-gnu-docker.env

[henderkes]

Success! It can link -static-pie against -l:libgomp.a because I compiled gcc with -fPIC -fPIE.

[henderkes]

@crazywhalecc would you mind upload the file to https://dl.static-php.dev?

[crazywhalecc]

@crazywhalecc would you mind upload the file to https://dl.static-php.dev?

I can't access the files in your drive now, it says they've been deleted. Also my network seems weird to access Microsoft services, it's super slow.

It would be better if we documented the process of building gcc10 like musl-toolchain. I'll try to build and upload this archive before I go on vacation.

[henderkes]

Yes, I built it using the devtoolset-10 in the spc-gnu-docker container.

gcc:

wget https://ftp.gnu.org/gnu/gcc/gcc-10.5.0/gcc-10.5.0.tar.gz
tar -xzf gcc-10.5.0.tar.gz
mkdir objdir
cd objdir
../gcc-10.5.0/configure \
 --prefix=/usr/local/gcc10 \
 --enable-bootstrap \
 --enable-languages=c,c++,fortran,lto \
 --enable-static \
 --enable-shared \
 --enable-threads=posix \
 --enable-checking=release \
 --disable-multilib \
 --with-zlib \
 --enable-default-pie \
 --enable-default-ssp \
 --disable-libunwind-exceptions \
 --enable-gnu-unique-object \
 --enable-linker-build-id \
 --with-gcc-major-version-only \
 --enable-initfini-array \
 --enable-plugins \
 --enable-gnu-indirect-function \
 --with-tune=generic \
 --with-arch_32=x86-64 \
 --build=x86_64-redhat-linux \
 --disable-libquadmath \
 --disable-libquadmath-support \
 --disable-nls \
 --with-pic \
 CFLAGS='-O2 -fPIC -fPIE -g0' \
 CXXFLAGS='-O2 -fPIC -fPIE -g0'

binutils: pseudocode

wget binutils 2.41
tar...
cd binutils-2.41
mkdir build
cd build
../configure --prefix=/usr/local/gcc10 --with-lib-dir=/usr/local/gcc10/lib:/usr/local/gcc/lib64 ...

[henderkes]

Preferably we would figure out if there's a way to set COMPILER_PATH during gcc build so it always uses the as and ranlib from the same folder instead of defaulting to the system ones. Same for (LD_)LIBRARY_PATH because I had to set these for the icu build. Or we handle that in the source code like for the musl build I guess.