MidgardOS Developer Documentation

A website documenting creating the build root for MidgardOS

Section 5 - Building the Base System Tools

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GNU Compiler Collection

Name: GNU Compiler Collection
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

Average Build Time: 46 SBU
Used Install Space: 1.8 GiB

Pre-Configuration

To allow older 32-bit pre-compiled Linux binaries and Windows PE 32-bit executables to run correctly under MidgardOS, we need to apply a small fix to the i386 C header. 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 the build root, run the following commands:

mkdir -v build && cd build
../configure                                                        \
    --prefix=/usr                                                   \
    --libdir=/usr/lib64                                             \
    --libexecdir=/usr/lib64                                         \
    --enable-languages=c,c++                                        \
    --enable-default-pie                                            \
    --enable-default-ssp                                            \
    --with-glibc-version=2.42                                       \
    --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-bootstrap                                             \
    --disable-fixincludes                                           \
    --with-system-zlib

Compilation and Installation

To compile the GNU Compiler Collection, run the following command:

make

Now, run the test suite:

sed -e '/cpython/d' -i ../gcc/testsuite/gcc.dg/plugin/plugin.exp
chown -R tester .
su tester -c "PATH=$PATH make -k check"
../contrib/test_summary | grep -A7 Summ
chown -R root:root .

Note, it is not expected that all tests will pass. GCC has some “future” looking tests for features under development in the tree. It is know that tests related to pr90579.c will fail.

Finally, to install the GNU Compiler Collection into the build tree, run the following commands:

make install
chown -v -R root:root /usr/lib64/gcc/$(gcc -dumpmachine)/15.2.0/include{,-fixed}
ln -svr /usr/bin/cpp /usr/lib64
ln -sv gcc.1 /usr/share/man/man1/cc.1
ln -sfv ../../lib64/gcc/$(gcc -dumpmachine)/15.2.0/liblto_plugin.so /usr/lib64/bfd-plugins/

Now that the last rebuild of GCC is complete before it is rebuilt for packaging as an RPM, we need to ensure that compiling and linking work as expected. To perform the first sanity check, run the following commands:

echo 'int main(){}' | cc -x c - -v -Wl,--verbose &> dummy.log
readelf -l a.out | grep ': /lib'

This should output the following:

[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]

Now, ensure that the compiler uses the correct start files:

grep -E -o '/usr/lib.*/S?crt[1in].*succeeded' dummy.log

This should output the following:

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.2.0/../../../../lib64/Scrt1.o succeeded
/usr/lib64/gcc/x86_64-pc-linux-gnu/15.2.0/../../../../lib64/crti.o succeeded
/usr/lib64/gcc/x86_64-pc-linux-gnu/15.2.0/../../../../lib64/crtn.o succeeded

Next, check that the compiler is using the correct header files:

grep -B4 '^ /usr/include' dummy.log

This should print the following output:

#include <...> search starts here:
 /usr/lib64/gcc/x86_64-pc-linux-gnu/15.2.0/include
 /usr/local/include
 /usr/lib64/gcc/x86_64-pc-linux-gnu/15.2.0/include-fixed
 /usr/include

After this, check that the compiler is using the right linker with the correct search paths:

grep 'SEARCH.*/usr/lib' dummy.log |sed 's|; |\n|g'

This should return the following:

SEARCH_DIR("/usr/x86_64-pc-linux-gnu/lib64")
SEARCH_DIR("/usr/local/lib64")
SEARCH_DIR("/lib64")
SEARCH_DIR("/usr/lib64")
SEARCH_DIR("/usr/x86_64-pc-linux-gnu/lib")
SEARCH_DIR("/usr/local/lib")
SEARCH_DIR("/lib")
SEARCH_DIR("/usr/lib");

Now, ensure that the correct libc is being used:

grep "/lib.*/libc.so.6 " dummy.log

This should output the following:

attempt to open /usr/lib64/libc.so.6 succeeded

And finally, validate that GCC is using the correct dynamic linker:

grep found dummy.log

This should print the following:

found ld-linux-x86-64.so.2 at /usr/lib64/ld-linux-x86-64.so.2

Once everything is validated, clean up our test files:

rm -v a.out dummy.log

Finally, move a mis-placed file:

install -v -d -m 755 -o root -g root /usr/share/gdb/auto-load/usr/lib
mv -v /usr/lib/*gdb.py /usr/share/gdb/auto-load/usr/lib

Contents

Contents  
Installed Programs c++, cc (link to gcc), cpp, g++, gcc, gcc-ar, gcc-nm, gcc-ranlib, gcov, gcov-dump, gcov-tool, and lto-dump
Installed Libraries libasan.{a,so}, libatomic.{a,so}, libcc1.so, libgcc.a, libgcc_eh.a, libgcc_s.so, libgcov.a, libgomp.{a,so}, libhwasan.{a,so}, libitm.{a,so}, liblsan.{a,so}, liblto_plugin.so, libquadmath.{a,so}, libssp.{a,so}, libssp_nonshared.a, libstdc++.{a,so}, libstdc++exp.a, libstdc++fs.a, libsupc++.a, libtsan.{a,so}, and libubsan.{a,so}
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