MidgardOS Developer Documentation

A website documenting creating the build root for MidgardOS

---

Section 2 - Cross-Compilation Toolchain

Navigation
« GNU Binutils	HOME	GNU GLibC - 64-bit »

GNU Compiler Collection - Pass 1 - Static, No Threads

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

Unlike earlier cross-compilation tools, GCC requires some extra steps to allow the binaries generated to utilize the earlier packages, such as binutils, etc. Much of the change requires MPC, MPFR, and GMP sources installed into the source tree to build correctly. To do so, run the following commands:

tar xvf ../isl-0.27.tar.xz
mv -v isl-0.27 isl
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 32bit 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

Configuration

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

mkdir -v build && cd build
../configure                                       \
    --target=$BRFS_TARGET                          \
    --prefix=$BRFS/tools                           \
    --with-glibc-version=2.42                      \
    --with-sysroot=$BRFS                           \
    --with-newlib                                  \
    --without-headers                              \
    --enable-default-pie                           \
    --enable-default-ssp                           \
    --enable-initfini-array                        \
    --with-bugurl="https://github.com/MidgardOS/MidgardOS/issues" \
	--with-pkgversion="MidgardOS"                  \
    --disable-nls                                  \
    --disable-shared                               \
    --enable-multilib                              \
    --with-arch-32=x86-64-v2                       \
    --with-arch=x86-64-v2                          \
    --with-tune=generic                            \
    --disable-decimal-float                        \
    --disable-threads                              \
    --disable-libatomic                            \
    --disable-libgomp                              \
    --disable-libquadmath                          \
    --disable-libssp                               \
    --disable-libvtv                               \
    --disable-libstdcxx                            \
    --enable-languages=c,c++

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 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 ..
cat gcc/limitx.h gcc/glimits.h gcc/limity.h > \
  `dirname $(${BRFS_TARGET}-gcc -print-libgcc-file-name)`/include/limits.h

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

Navigation
« GNU Binutils	HOME	GNU GLibC - 64-bit »