MidgardOS Developer Documentation

A website documenting creating the build root for MidgardOS

---

Section 3 - Temporary Tools

Navigation
« GNU Binutils	HOME	Entering the Build Root »

GNU Compiler Collection - Pass 2

Name: gcc
Summary: A suite of compiler tools
License: GPL v3.0+
Version: 15.2.0
URL: https://ftp.gnu.org/gnu/gcc/gcc-15.2.0.tar.xz

Pre-Configuration

Like before with the cross-compilation tools, GCC requires some extra steps to allow the binaries generated to utilize the earlier packages, such as the new binutils, etc.

tar xvf ../mpfr-4.2.2.tar.xz
mv -v mpfr-4.2.2 mpfr
tar xvf ../gmp-6.3.0.tar.xz
mv -v gmp-6.3.0 gmp
tar xvf ../mpc-1.3.1.tar.gz
mv -v mpc-1.3.1 mpc

Next, we need to apply a small fix to allow older 32-bit pre-compiled Linux binaries and Windows PE 32bit binaries to run correctly on MidgardOS. To do so, run the following command:

sed '/STACK_REALIGN_DEFAULT/s/0/(!TARGET_64BIT \&\& TARGET_SSE)/' \
      -i gcc/config/i386/i386.h

Finally, we need to override the build rules to allow libgcc and libstdc++ so that they can be built with POSIX threads enabled:

sed '/thread_header =/s/@.*@/gthr-posix.h/' \
    -i libgcc/Makefile.in libstdc++-v3/include/Makefile.in

Configuration

To configure the GNU Compiler Collection for install into our cross-compilation root, run the following command:

mkdir -v build && cd build
../configure                                       \
    --build=$BRFS_TARGET                           \
    --host=$BRFS_TARGET                            \
    --prefix=/usr                                  \
    --libdir=/usr/lib64                            \
    --libexecdir=/usr/lib64                        \
    --with-build-sysroot=$BRFS                     \
    --enable-default-pie                           \
    --enable-default-ssp                           \
    --with-glibc-version=2.42                      \
    --disable-nls                                  \
    --with-bugurl="https://github.com/MidgardOS/MidgardOS/issues" \
    --with-pkgversion="MidgardOS"                  \
    --enable-multilib                              \
    --with-arch-32=x86-64-v2                       \
    --with-arch=x86-64-v2                          \
    --with-tune=generic                            \
    --disable-libatomic                            \
    --disable-libgomp                              \
    --disable-libquadmath                          \
    --disable-libsanitizer                         \
    --disable-libssp                               \
    --disable-libvtv                               \
    --enable-languages=c,c++                       \
    LDFLAGS_FOR_TARGET=-L$PWD/$BRFS_TARGET/libgcc

Stay in the build directory until this package is installed.

Compilation and Installation

To compile GNU Compiler Collection, run the following command:

make

Next, to install GNU Compiler Collection into the cross-tools tree, run the following command:

make DESTDIR=$BRFS install

Finally, to allow other builds to be successful, we need to create a dummy system header for limits.h, as the one that GCC installs for itself is a partial header that references the system limits.h. At this point, that header is not yet installed. While this works for building GLibC (the next package in the list), this will break with other tools later in the stack.

cd $BRFS/usr/bin
ln -sv x86_64-unknown-linux-gnu-gcc-15.2.0 gcc-15.2.0
ln -sv gcc cc
cd -

More details about this package is covered later in the core system build.

Navigation
« GNU Binutils	HOME	Entering the Build Root »