source: rtems/contrib/crossrpms/gcc/build.add @ ffbfa5b

%build
  mkdir -p build

  cd build

  languages="c"
%if %build_cxx
  languages="$languages,c++"
%endif
%if %build_fortran
  languages="$languages,fortran"
%endif
%if %build_gcj
  languages="$languages,java"
%endif
%if %build_objc
  languages="$languages,objc"
%endif
%if %build_gnat
  languages="$languages,ada"
%endif
%if %build_libgcj
  optargs="--enable-libgcj"
%endif
%if "%{_prefix}" != "/usr"
  export PATH="%{_bindir}:${PATH}"
%endif
%if "%{_build}" != "%{_host}"
  CFLAGS_FOR_BUILD="-g -O2 -Wall" \
  CC="%{_host}-gcc ${RPM_OPT_FLAGS}" \
%else
# gcc is not ready to be compiled with -std=gnu99
  CC=$(echo "%{__cc} ${RPM_OPT_FLAGS}" | sed -e 's,-std=gnu99 ,,') \
%endif
  ../gcc-%{gcc_pkgvers}/configure \
    --prefix=%{_prefix} \
    --bindir=%{_bindir} \
    --exec_prefix=%{_exec_prefix} \
    --includedir=%{_includedir} \
    --libdir=%{_gcclibdir} \
    --libexecdir=%{_libexecdir} \
    --mandir=%{_mandir} \
    --infodir=%{_infodir} \
    --datadir=%{_datadir} \
    --build=%_build --host=%_host \
    --target=@tool_target@ \
    --disable-libstdcxx-pch \
    --with-gnu-as --with-gnu-ld --verbose \
    --with-newlib \
    --with-system-zlib \
    --disable-nls --without-included-gettext \
    --disable-win32-registry \
    --enable-version-specific-runtime-libs \
    --enable-threads \
    --with-sysroot=%{_exec_prefix}/@tool_target@/sys-root \
    %{?with_lto:--enable-lto}%{!?with_lto:--disable-lto} \
    %{?with_plugin:--enable-plugin}%{!?with_plugin:--disable-plugin} \
%if %build_newlib
    --enable-newlib-io-c99-formats \
%endif
    --enable-languages="$languages" $optargs

%if "%_host" != "%_build"
  # Bug in gcc-3.2.1:
  # Somehow, gcc doesn't get syslimits.h right for Cdn-Xs
  mkdir -p gcc/include
  cp ../gcc-%{gcc_pkgvers}/gcc/gsyslimits.h gcc/include/syslimits.h
%endif

  make %{?_smp_mflags} all
%if %build_infos
  make info
%endif
  cd ..