Building a host-isolated gcc without faking cross-compiling

Building a host-isolated gcc without faking cross-compiling

[Anthony de Almeida Lopes]

I'd like to build gcc for a chroot on my current system. Linux From
Scratch uses a method of faking a cross compiler by modifying the vendor
field of the target string. For example, changing x86_64-pc-linux-gnu to
x86_64-lfs-linux-gnu. I'd like to know if there's a way of avoiding
this. While GCC builds fine for my host natively and it builds fine with
the LFS method, I have so far been unable to build a host isolated copy
any other way.

I understand the recommended order is to build binutils and gcc first,
then build glibc with them and finally rebuild gcc against that glibc.

# I built binutils like this

../configure   \
    --prefix=$DISTRO/root/bootstrap \
    --with-sysroot=$DISTRO  \
    --disable-nls \
    --disable-werror

&& make -j6 && make -j1 install

# Then I tried to build gcc like this

../configure                                       \
     --prefix=$DISTRO/tools                         \
     --with-glibc-version=2.11                      \
     --with-sysroot=$DISTRO                         \
     --with-newlib                                  \
     --without-headers                              \
     --enable-initfini-array                        \
     --disable-nls                                  \
     --disable-shared                               \
     --disable-multilib                             \
     --disable-decimal-float                        \
     --disable-threads                              \
     --disable-libatomic                            \
     --disable-libgomp                              \
     --disable-libquadmath                          \
     --disable-libssp                               \
     --disable-libvtv                               \
     --disable-libstdcxx                            \
     --enable-languages=c,c++

&& make -j6 && make -j1 install

But this fails with a bunch of undefined references to the ZSTD
namespace such as ZSTD_getErrorName from gcc/lto-compress.c. I assume
this means that ./configure has detected that my host system has libzstd
but it's trying to look for them in the sysroot, where it obviously
can't find them. This happens even if I use --disable-lto.

Build System (Arch Linux): linux 5.13.13, glibc 2.33, binutils 2.36.1,
gcc 11.1.0
Target System: linux 5.13.12, glibc 2.34, binutils 2.37, gcc 11.2.0

So I'd like to know if I should continue like this, and if so how, or if
there is a better (maybe canonical) way of building a host-isolated
compiler?

- Anthony

Re: Building a host-isolated gcc without faking cross-compiling

[Lance Fredrickson]

I think you probably want |--with-native-system-header-dir

|
|--with-native-system-header-dir=dirname|

    Specifies thatdirnameis the directory that contains native system
    header files, rather than/usr/include. This option is most useful if
    you are creating a compiler that should be isolated from the system
    as much as possible. It is most commonly used with
    the--with-sysrootoption and will cause GCC to searchdirnameinside
    the system root specified by that option.

Lance

On 9/10/2021 10:54 AM, Anthony de Almeida Lopes via Gcc-help wrote:
> I'd like to build gcc for a chroot on my current system. Linux From
> Scratch uses a method of faking a cross compiler by modifying the vendor
> field of the target string. For example, changing x86_64-pc-linux-gnu to
> x86_64-lfs-linux-gnu. I'd like to know if there's a way of avoiding
> this. While GCC builds fine for my host natively and it builds fine with
> the LFS method, I have so far been unable to build a host isolated copy
> any other way.
>
> I understand the recommended order is to build binutils and gcc first,
> then build glibc with them and finally rebuild gcc against that glibc.
>
> # I built binutils like this
>
> ../configure   \
>      --prefix=$DISTRO/root/bootstrap \
>      --with-sysroot=$DISTRO  \
>      --disable-nls \
>      --disable-werror
>
> && make -j6 && make -j1 install
>
> # Then I tried to build gcc like this
>
> ../configure                                       \
>       --prefix=$DISTRO/tools                         \
>       --with-glibc-version=2.11                      \
>       --with-sysroot=$DISTRO                         \
>       --with-newlib                                  \
>       --without-headers                              \
>       --enable-initfini-array                        \
>       --disable-nls                                  \
>       --disable-shared                               \
>       --disable-multilib                             \
>       --disable-decimal-float                        \
>       --disable-threads                              \
>       --disable-libatomic                            \
>       --disable-libgomp                              \
>       --disable-libquadmath                          \
>       --disable-libssp                               \
>       --disable-libvtv                               \
>       --disable-libstdcxx                            \
>       --enable-languages=c,c++
>
> && make -j6 && make -j1 install
>
> But this fails with a bunch of undefined references to the ZSTD
> namespace such as ZSTD_getErrorName from gcc/lto-compress.c. I assume
> this means that ./configure has detected that my host system has libzstd
> but it's trying to look for them in the sysroot, where it obviously
> can't find them. This happens even if I use --disable-lto.
>
> Build System (Arch Linux): linux 5.13.13, glibc 2.33, binutils 2.36.1,
> gcc 11.1.0
> Target System: linux 5.13.12, glibc 2.34, binutils 2.37, gcc 11.2.0
>
> So I'd like to know if I should continue like this, and if so how, or if
> there is a better (maybe canonical) way of building a host-isolated
> compiler?
>
> - Anthony
>
>

Re: Building a host-isolated gcc without faking cross-compiling

[Anthony de Almeida Lopes]

Thanks, I missed that, but it doesn't seem to help. I still get the
undefined references to ZSTD API calls.

g++ -std=c++11 -no-pie   -g -O2 -DIN_GCC     -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-error=format-diag -Wno-format
-Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -fno-common 
-DHAVE_CONFIG_H -static-libstdc++ -static-libgcc  -o cc1plus \
       cp/cp-lang.o c-family/stub-objc.o cp/call.o cp/class.o
cp/constexpr.o cp/constraint.o cp/coroutines.o cp/cp-gimplify.o
cp/cp-objcp-common.o cp/cp-ubsan.o cp/cvt.o cp/cxx-pretty-print.o
cp/decl.o cp/decl2.o cp/dump.o cp/error.o cp/except.o cp/expr.o
cp/friend.o cp/init.o cp/lambda.o cp/lex.o cp/logic.o cp/mangle.o
cp/mapper-client.o cp/mapper-resolver.o cp/method.o cp/module.o
cp/name-lookup.o cp/optimize.o cp/parser.o cp/pt.o cp/ptree.o cp/rtti.o
cp/search.o cp/semantics.o cp/tree.o cp/typeck.o cp/typeck2.o
cp/vtable-class-hierarchy.o attribs.o incpath.o c-family/c-common.o
c-family/c-cppbuiltin.o c-family/c-dump.o c-family/c-format.o
c-family/c-gimplify.o c-family/c-indentation.o c-family/c-lex.o
c-family/c-omp.o c-family/c-opts.o c-family/c-pch.o
c-family/c-ppoutput.o c-family/c-pragma.o c-family/c-pretty-print.o
c-family/c-semantics.o c-family/c-ada-spec.o c-family/c-ubsan.o
c-family/known-headers.o c-family/c-attribs.o c-family/c-warn.o
c-family/c-spellcheck.o i386-c.o glibc-c.o cc1plus-checksum.o
libbackend.a main.o libcommon-target.a libcommon.a ../libcpp/libcpp.a
../libdecnumber/libdecnumber.a ../libcody/libcody.a  \
     libcommon.a ../libcpp/libcpp.a ../libbacktrace/.libs/libbacktrace.a
../libiberty/libiberty.a ../libdecnumber/libdecnumber.a
-L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./gmp/.libs
-L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./mpfr/src/.libs
-L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./mpc/src/.libs
-lmpc -lmpfr -lgmp -rdynamic -ldl  -L./../zlib -lz
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:135:
undefined reference to `ZSTD_compressBound'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_compression_zstd':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:138:
undefined reference to `ZSTD_compress'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:141:
undefined reference to `ZSTD_isError'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:120:
undefined reference to `ZSTD_maxCLevel'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_normalized_zstd_level':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:121:
undefined reference to `ZSTD_maxCLevel'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_compression_zstd':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:142:
undefined reference to `ZSTD_getErrorName'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function
`lto_end_uncompression(lto_compression_stream*,
lto_compression)lto-compress.o':
: in function
`/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:161:
undefined reference to
`lto_end_compression(lto_compression_stream*)ZSTD_getFrameContentSize':
'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:lto-compress.o:
in function `135lto_uncompression_zstd: undefined reference to `':
ZSTD_compressBound/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:'
168: undefined reference to
`ZSTD_decompress/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld'
:
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ldlto-compress.o:
: in function
`/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:lto_compression_zstd170':
: undefined reference to
`ZSTD_isError/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:'
138: undefined reference to
`ZSTD_compress/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld'
:
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c::
171/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c::
undefined reference to `141ZSTD_getErrorName: undefined reference to `'
ZSTD_isError'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:120:
undefined reference to `ZSTD_maxCLevel'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_normalized_zstd_level':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:121:
undefined reference to `ZSTD_maxCLevel'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_compression_zstd':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:142:
undefined reference to `ZSTD_getErrorName'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function
`lto_end_uncompression(lto_compression_stream*, lto_compression)':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:161:
undefined reference to `ZSTD_getFrameContentSize'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
lto-compress.o: in function `lto_uncompression_zstd':
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:168:
undefined reference to `ZSTD_decompress'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:170:
undefined reference to `ZSTD_isError'
/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:171:
undefined reference to `ZSTD_getErrorName'
collect2: error: ld returned 1 exit status
make[3]: *** [../../gcc/c/Make-lang.in:87: cc1] Error 1
make[3]: *** Waiting for unfinished jobs....
collect2: error: ld returned 1 exit status
make[3]: *** [../../gcc/cp/Make-lang.in:136: cc1plus] Error 1

On 9/10/21 7:46 PM, Lance Fredrickson via Gcc-help wrote:
> I think you probably want |--with-native-system-header-dir
>
> |
> |--with-native-system-header-dir=dirname|
>
>      Specifies thatdirnameis the directory that contains native system
>      header files, rather than/usr/include. This option is most useful if
>      you are creating a compiler that should be isolated from the system
>      as much as possible. It is most commonly used with
>      the--with-sysrootoption and will cause GCC to searchdirnameinside
>      the system root specified by that option.
>
> Lance
>
> On 9/10/2021 10:54 AM, Anthony de Almeida Lopes via Gcc-help wrote:
>> I'd like to build gcc for a chroot on my current system. Linux From
>> Scratch uses a method of faking a cross compiler by modifying the vendor
>> field of the target string. For example, changing x86_64-pc-linux-gnu to
>> x86_64-lfs-linux-gnu. I'd like to know if there's a way of avoiding
>> this. While GCC builds fine for my host natively and it builds fine with
>> the LFS method, I have so far been unable to build a host isolated copy
>> any other way.
>>
>> I understand the recommended order is to build binutils and gcc first,
>> then build glibc with them and finally rebuild gcc against that glibc.
>>
>> # I built binutils like this
>>
>> ../configure   \
>>       --prefix=$DISTRO/root/bootstrap \
>>       --with-sysroot=$DISTRO  \
>>       --disable-nls \
>>       --disable-werror
>>
>> && make -j6 && make -j1 install
>>
>> # Then I tried to build gcc like this
>>
>> ../configure                                       \
>>        --prefix=$DISTRO/tools                         \
>>        --with-glibc-version=2.11                      \
>>        --with-sysroot=$DISTRO                         \
>>        --with-newlib                                  \
>>        --without-headers                              \
>>        --enable-initfini-array                        \
>>        --disable-nls                                  \
>>        --disable-shared                               \
>>        --disable-multilib                             \
>>        --disable-decimal-float                        \
>>        --disable-threads                              \
>>        --disable-libatomic                            \
>>        --disable-libgomp                              \
>>        --disable-libquadmath                          \
>>        --disable-libssp                               \
>>        --disable-libvtv                               \
>>        --disable-libstdcxx                            \
>>        --enable-languages=c,c++
>>
>> && make -j6 && make -j1 install
>>
>> But this fails with a bunch of undefined references to the ZSTD
>> namespace such as ZSTD_getErrorName from gcc/lto-compress.c. I assume
>> this means that ./configure has detected that my host system has libzstd
>> but it's trying to look for them in the sysroot, where it obviously
>> can't find them. This happens even if I use --disable-lto.
>>
>> Build System (Arch Linux): linux 5.13.13, glibc 2.33, binutils 2.36.1,
>> gcc 11.1.0
>> Target System: linux 5.13.12, glibc 2.34, binutils 2.37, gcc 11.2.0
>>
>> So I'd like to know if I should continue like this, and if so how, or if
>> there is a better (maybe canonical) way of building a host-isolated
>> compiler?
>>
>> - Anthony
>>
>>

Re: Building a host-isolated gcc without faking cross-compiling

[Lance Fredrickson]

Hmmm, well you can also try --without-zstd.  There was a commit last 
year to ensure this flags is respected.

commit 0fb0240a051df91d3c24385d1d3c17548b266544
Author: Martin Liska <mliska@suse.cz>
Date:   Wed Mar 25 11:01:43 2020 +0100

     Fix handling of --with{,out}-zstd option.

             PR lto/94259
             * configure.ac: Respect --without-zstd and report
             error when we can't find header file with --with-zstd.
             * configure: Regenerate.

Lance

On 9/10/2021 12:21 PM, Anthony de Almeida Lopes via Gcc-help wrote:
> Thanks, I missed that, but it doesn't seem to help. I still get the
> undefined references to ZSTD API calls.
>
> g++ -std=c++11 -no-pie   -g -O2 -DIN_GCC     -fno-exceptions -fno-rtti
> -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
> -Wcast-qual -Wno-error=format-diag -Wno-format
> -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long
> -Wno-variadic-macros -Wno-overlength-strings -fno-common
> -DHAVE_CONFIG_H -static-libstdc++ -static-libgcc  -o cc1plus \
>         cp/cp-lang.o c-family/stub-objc.o cp/call.o cp/class.o
> cp/constexpr.o cp/constraint.o cp/coroutines.o cp/cp-gimplify.o
> cp/cp-objcp-common.o cp/cp-ubsan.o cp/cvt.o cp/cxx-pretty-print.o
> cp/decl.o cp/decl2.o cp/dump.o cp/error.o cp/except.o cp/expr.o
> cp/friend.o cp/init.o cp/lambda.o cp/lex.o cp/logic.o cp/mangle.o
> cp/mapper-client.o cp/mapper-resolver.o cp/method.o cp/module.o
> cp/name-lookup.o cp/optimize.o cp/parser.o cp/pt.o cp/ptree.o cp/rtti.o
> cp/search.o cp/semantics.o cp/tree.o cp/typeck.o cp/typeck2.o
> cp/vtable-class-hierarchy.o attribs.o incpath.o c-family/c-common.o
> c-family/c-cppbuiltin.o c-family/c-dump.o c-family/c-format.o
> c-family/c-gimplify.o c-family/c-indentation.o c-family/c-lex.o
> c-family/c-omp.o c-family/c-opts.o c-family/c-pch.o
> c-family/c-ppoutput.o c-family/c-pragma.o c-family/c-pretty-print.o
> c-family/c-semantics.o c-family/c-ada-spec.o c-family/c-ubsan.o
> c-family/known-headers.o c-family/c-attribs.o c-family/c-warn.o
> c-family/c-spellcheck.o i386-c.o glibc-c.o cc1plus-checksum.o
> libbackend.a main.o libcommon-target.a libcommon.a ../libcpp/libcpp.a
> ../libdecnumber/libdecnumber.a ../libcody/libcody.a  \
>       libcommon.a ../libcpp/libcpp.a ../libbacktrace/.libs/libbacktrace.a
> ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a
> -L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./gmp/.libs
> -L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./mpfr/src/.libs
> -L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./mpc/src/.libs
> -lmpc -lmpfr -lgmp -rdynamic -ldl  -L./../zlib -lz
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:135:
> undefined reference to `ZSTD_compressBound'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_compression_zstd':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:138:
> undefined reference to `ZSTD_compress'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:141:
> undefined reference to `ZSTD_isError'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:120:
> undefined reference to `ZSTD_maxCLevel'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_normalized_zstd_level':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:121:
> undefined reference to `ZSTD_maxCLevel'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_compression_zstd':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:142:
> undefined reference to `ZSTD_getErrorName'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function
> `lto_end_uncompression(lto_compression_stream*,
> lto_compression)lto-compress.o':
> : in function
> `/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:161:
> undefined reference to
> `lto_end_compression(lto_compression_stream*)ZSTD_getFrameContentSize':
> '
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:lto-compress.o:
> in function `135lto_uncompression_zstd: undefined reference to `':
> ZSTD_compressBound/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:'
> 168: undefined reference to
> `ZSTD_decompress/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld'
> :
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ldlto-compress.o:
> : in function
> `/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:lto_compression_zstd170':
> : undefined reference to
> `ZSTD_isError/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:'
> 138: undefined reference to
> `ZSTD_compress/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld'
> :
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c::
> 171/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c::
> undefined reference to `141ZSTD_getErrorName: undefined reference to `'
> ZSTD_isError'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:120:
> undefined reference to `ZSTD_maxCLevel'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_normalized_zstd_level':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:121:
> undefined reference to `ZSTD_maxCLevel'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_compression_zstd':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:142:
> undefined reference to `ZSTD_getErrorName'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function
> `lto_end_uncompression(lto_compression_stream*, lto_compression)':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:161:
> undefined reference to `ZSTD_getFrameContentSize'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> lto-compress.o: in function `lto_uncompression_zstd':
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:168:
> undefined reference to `ZSTD_decompress'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:170:
> undefined reference to `ZSTD_isError'
> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:171:
> undefined reference to `ZSTD_getErrorName'
> collect2: error: ld returned 1 exit status
> make[3]: *** [../../gcc/c/Make-lang.in:87: cc1] Error 1
> make[3]: *** Waiting for unfinished jobs....
> collect2: error: ld returned 1 exit status
> make[3]: *** [../../gcc/cp/Make-lang.in:136: cc1plus] Error 1
>
> On 9/10/21 7:46 PM, Lance Fredrickson via Gcc-help wrote:
>> I think you probably want |--with-native-system-header-dir
>>
>> |
>> |--with-native-system-header-dir=dirname|
>>
>>       Specifies thatdirnameis the directory that contains native system
>>       header files, rather than/usr/include. This option is most useful if
>>       you are creating a compiler that should be isolated from the system
>>       as much as possible. It is most commonly used with
>>       the--with-sysrootoption and will cause GCC to searchdirnameinside
>>       the system root specified by that option.
>>
>> Lance
>>
>> On 9/10/2021 10:54 AM, Anthony de Almeida Lopes via Gcc-help wrote:
>>> I'd like to build gcc for a chroot on my current system. Linux From
>>> Scratch uses a method of faking a cross compiler by modifying the vendor
>>> field of the target string. For example, changing x86_64-pc-linux-gnu to
>>> x86_64-lfs-linux-gnu. I'd like to know if there's a way of avoiding
>>> this. While GCC builds fine for my host natively and it builds fine with
>>> the LFS method, I have so far been unable to build a host isolated copy
>>> any other way.
>>>
>>> I understand the recommended order is to build binutils and gcc first,
>>> then build glibc with them and finally rebuild gcc against that glibc.
>>>
>>> # I built binutils like this
>>>
>>> ../configure   \
>>>        --prefix=$DISTRO/root/bootstrap \
>>>        --with-sysroot=$DISTRO  \
>>>        --disable-nls \
>>>        --disable-werror
>>>
>>> && make -j6 && make -j1 install
>>>
>>> # Then I tried to build gcc like this
>>>
>>> ../configure                                       \
>>>         --prefix=$DISTRO/tools                         \
>>>         --with-glibc-version=2.11                      \
>>>         --with-sysroot=$DISTRO                         \
>>>         --with-newlib                                  \
>>>         --without-headers                              \
>>>         --enable-initfini-array                        \
>>>         --disable-nls                                  \
>>>         --disable-shared                               \
>>>         --disable-multilib                             \
>>>         --disable-decimal-float                        \
>>>         --disable-threads                              \
>>>         --disable-libatomic                            \
>>>         --disable-libgomp                              \
>>>         --disable-libquadmath                          \
>>>         --disable-libssp                               \
>>>         --disable-libvtv                               \
>>>         --disable-libstdcxx                            \
>>>         --enable-languages=c,c++
>>>
>>> && make -j6 && make -j1 install
>>>
>>> But this fails with a bunch of undefined references to the ZSTD
>>> namespace such as ZSTD_getErrorName from gcc/lto-compress.c. I assume
>>> this means that ./configure has detected that my host system has libzstd
>>> but it's trying to look for them in the sysroot, where it obviously
>>> can't find them. This happens even if I use --disable-lto.
>>>
>>> Build System (Arch Linux): linux 5.13.13, glibc 2.33, binutils 2.36.1,
>>> gcc 11.1.0
>>> Target System: linux 5.13.12, glibc 2.34, binutils 2.37, gcc 11.2.0
>>>
>>> So I'd like to know if I should continue like this, and if so how, or if
>>> there is a better (maybe canonical) way of building a host-isolated
>>> compiler?
>>>
>>> - Anthony
>>>
>>>

Re: Building a host-isolated gcc without faking cross-compiling

[Anthony de Almeida Lopes]

Alright, progress. I'm still researching the next problems that I ran
into but I thought I'd post an update. First, I ran into
GCC_NO_EXECUTABLES while the build was in configure-stage2-zlib and in
anticipating what Lance might say to that, I checked and there doesn't
seem to be a --without-zlib although I did test that just in case and it
did nothing. The best explanation for what GCC_NO_EXECUTABLES is that I
found so far is in a post to the list about a similar problem:

https://gcc.gnu.org/legacy-ml/gcc/2008-03/msg00515.html

I went ahead and built it anyway with --disable-bootstrap. glibc
compiled but not too surprisingly running ldd or /usr/lib/libc.so.6 with
LD_LIBRARY_PATH to $DISTRO/usr/lib just segfaults, so it seems like it
wasn't really a sane build of gcc after all.

Ignoring that problem, configuring libstdc++-v3 after having glibc fails
which is kind of obvious since the host glibc differs in version from
the target version. You know, the typical "version `GLIBC_2.34' not
found" errors. This seems like a proper motivating reason for using the
fake cross-compiling trick but I'm determined to figure out if there's a
way around that.

../configure \
      --prefix=$DISTRO/root/bootstrap \
      --with-glibc-version=2.11 \
      --with-sysroot=$DISTRO \
     --with-native-system-header-dir=$DISTRO/usr/include \
     --without-zstd \
      --with-newlib \
      --without-headers \
      --enable-initfini-array \
      --disable-nls \
      --disable-shared \
      --disable-multilib \
      --disable-decimal-float \
      --disable-threads \
      --disable-libatomic \
      --disable-libgomp \
      --disable-libquadmath \
      --disable-libssp \
      --disable-libvtv \
      --disable-libstdcxx \
      --enable-languages=c,c++

....


checking whether the
/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./prev-gcc/xgcc
-B/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./prev-gcc/
-B/home/guerrilla/Projects/Boots/distro/root/bootstrap/x86_64-pc-linux-gnu/bin/
-B/home/guerrilla/Projects/Boots/distro/root/bootstrap/x86_64-pc-linux-gnu/bin/
-B/home/guerrilla/Projects/Boots/distro/root/bootstrap/x86_64-pc-linux-gnu/lib/
-isystem
/home/guerrilla/Projects/Boots/distro/root/bootstrap/x86_64-pc-linux-gnu/include
-isystem
/home/guerrilla/Projects/Boots/distro/root/bootstrap/x86_64-pc-linux-gnu/sys-include
-fno-checking linker (ld -m elf_x86_64) supports shared libraries... yes
checking dynamic linker characteristics... configure: error: Link tests
are not allowed after GCC_NO_EXECUTABLES.
make[2]: *** [Makefile:16252: configure-stage2-zlib] Error 1
yes
checking for an ANSI C-conforming const... yes
checking for inline... inline
checking whether byte ordering is bigendian... no
checking for a BSD-compatible install... /usr/bin/install -c
checking for CET support... configure: error: Link tests are not allowed
after GCC_NO_EXECUTABLES.
make[2]: *** [Makefile:14566: configure-stage2-libiberty] Error 1
make[2]: Leaving directory
'/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build'
make[1]: *** [Makefile:23471: stage2-bubble] Error 2
make[1]: Leaving directory
'/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build'
make: *** [Makefile:954: all] Error 2






On 9/10/21 8:42 PM, Lance Fredrickson via Gcc-help wrote:
> Hmmm, well you can also try --without-zstd.  There was a commit last
> year to ensure this flags is respected.
>
> commit 0fb0240a051df91d3c24385d1d3c17548b266544
> Author: Martin Liska <mliska@suse.cz>
> Date:   Wed Mar 25 11:01:43 2020 +0100
>
>       Fix handling of --with{,out}-zstd option.
>
>               PR lto/94259
>               * configure.ac: Respect --without-zstd and report
>               error when we can't find header file with --with-zstd.
>               * configure: Regenerate.
>
> Lance
>
> On 9/10/2021 12:21 PM, Anthony de Almeida Lopes via Gcc-help wrote:
>> Thanks, I missed that, but it doesn't seem to help. I still get the
>> undefined references to ZSTD API calls.
>>
>> g++ -std=c++11 -no-pie   -g -O2 -DIN_GCC     -fno-exceptions -fno-rtti
>> -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
>> -Wcast-qual -Wno-error=format-diag -Wno-format
>> -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long
>> -Wno-variadic-macros -Wno-overlength-strings -fno-common
>> -DHAVE_CONFIG_H -static-libstdc++ -static-libgcc  -o cc1plus \
>>          cp/cp-lang.o c-family/stub-objc.o cp/call.o cp/class.o
>> cp/constexpr.o cp/constraint.o cp/coroutines.o cp/cp-gimplify.o
>> cp/cp-objcp-common.o cp/cp-ubsan.o cp/cvt.o cp/cxx-pretty-print.o
>> cp/decl.o cp/decl2.o cp/dump.o cp/error.o cp/except.o cp/expr.o
>> cp/friend.o cp/init.o cp/lambda.o cp/lex.o cp/logic.o cp/mangle.o
>> cp/mapper-client.o cp/mapper-resolver.o cp/method.o cp/module.o
>> cp/name-lookup.o cp/optimize.o cp/parser.o cp/pt.o cp/ptree.o cp/rtti.o
>> cp/search.o cp/semantics.o cp/tree.o cp/typeck.o cp/typeck2.o
>> cp/vtable-class-hierarchy.o attribs.o incpath.o c-family/c-common.o
>> c-family/c-cppbuiltin.o c-family/c-dump.o c-family/c-format.o
>> c-family/c-gimplify.o c-family/c-indentation.o c-family/c-lex.o
>> c-family/c-omp.o c-family/c-opts.o c-family/c-pch.o
>> c-family/c-ppoutput.o c-family/c-pragma.o c-family/c-pretty-print.o
>> c-family/c-semantics.o c-family/c-ada-spec.o c-family/c-ubsan.o
>> c-family/known-headers.o c-family/c-attribs.o c-family/c-warn.o
>> c-family/c-spellcheck.o i386-c.o glibc-c.o cc1plus-checksum.o
>> libbackend.a main.o libcommon-target.a libcommon.a ../libcpp/libcpp.a
>> ../libdecnumber/libdecnumber.a ../libcody/libcody.a  \
>>        libcommon.a ../libcpp/libcpp.a ../libbacktrace/.libs/libbacktrace.a
>> ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a
>> -L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./gmp/.libs
>> -L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./mpfr/src/.libs
>> -L/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/./mpc/src/.libs
>> -lmpc -lmpfr -lgmp -rdynamic -ldl  -L./../zlib -lz
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:135:
>> undefined reference to `ZSTD_compressBound'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_compression_zstd':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:138:
>> undefined reference to `ZSTD_compress'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:141:
>> undefined reference to `ZSTD_isError'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:120:
>> undefined reference to `ZSTD_maxCLevel'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_normalized_zstd_level':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:121:
>> undefined reference to `ZSTD_maxCLevel'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_compression_zstd':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:142:
>> undefined reference to `ZSTD_getErrorName'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function
>> `lto_end_uncompression(lto_compression_stream*,
>> lto_compression)lto-compress.o':
>> : in function
>> `/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:161:
>> undefined reference to
>> `lto_end_compression(lto_compression_stream*)ZSTD_getFrameContentSize':
>> '
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:lto-compress.o:
>> in function `135lto_uncompression_zstd: undefined reference to `':
>> ZSTD_compressBound/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:'
>> 168: undefined reference to
>> `ZSTD_decompress/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld'
>> :
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ldlto-compress.o:
>> : in function
>> `/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:lto_compression_zstd170':
>> : undefined reference to
>> `ZSTD_isError/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:'
>> 138: undefined reference to
>> `ZSTD_compress/home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld'
>> :
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c::
>> 171/home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c::
>> undefined reference to `141ZSTD_getErrorName: undefined reference to `'
>> ZSTD_isError'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_end_compression(lto_compression_stream*)':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:120:
>> undefined reference to `ZSTD_maxCLevel'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_normalized_zstd_level':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:121:
>> undefined reference to `ZSTD_maxCLevel'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_compression_zstd':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:142:
>> undefined reference to `ZSTD_getErrorName'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function
>> `lto_end_uncompression(lto_compression_stream*, lto_compression)':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:161:
>> undefined reference to `ZSTD_getFrameContentSize'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> lto-compress.o: in function `lto_uncompression_zstd':
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:168:
>> undefined reference to `ZSTD_decompress'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:170:
>> undefined reference to `ZSTD_isError'
>> /home/guerrilla/Projects/Boots/distro/root/bootstrap/bin/ld:
>> /home/guerrilla/Projects/Boots/src/gcc-11.2.0/build/gcc/../../gcc/lto-compress.c:171:
>> undefined reference to `ZSTD_getErrorName'
>> collect2: error: ld returned 1 exit status
>> make[3]: *** [../../gcc/c/Make-lang.in:87: cc1] Error 1
>> make[3]: *** Waiting for unfinished jobs....
>> collect2: error: ld returned 1 exit status
>> make[3]: *** [../../gcc/cp/Make-lang.in:136: cc1plus] Error 1
>>
>> On 9/10/21 7:46 PM, Lance Fredrickson via Gcc-help wrote:
>>> I think you probably want |--with-native-system-header-dir
>>>
>>> |
>>> |--with-native-system-header-dir=dirname|
>>>
>>>        Specifies thatdirnameis the directory that contains native system
>>>        header files, rather than/usr/include. This option is most useful if
>>>        you are creating a compiler that should be isolated from the system
>>>        as much as possible. It is most commonly used with
>>>        the--with-sysrootoption and will cause GCC to searchdirnameinside
>>>        the system root specified by that option.
>>>
>>> Lance
>>>
>>> On 9/10/2021 10:54 AM, Anthony de Almeida Lopes via Gcc-help wrote:
>>>> I'd like to build gcc for a chroot on my current system. Linux From
>>>> Scratch uses a method of faking a cross compiler by modifying the vendor
>>>> field of the target string. For example, changing x86_64-pc-linux-gnu to
>>>> x86_64-lfs-linux-gnu. I'd like to know if there's a way of avoiding
>>>> this. While GCC builds fine for my host natively and it builds fine with
>>>> the LFS method, I have so far been unable to build a host isolated copy
>>>> any other way.
>>>>
>>>> I understand the recommended order is to build binutils and gcc first,
>>>> then build glibc with them and finally rebuild gcc against that glibc.
>>>>
>>>> # I built binutils like this
>>>>
>>>> ../configure   \
>>>>         --prefix=$DISTRO/root/bootstrap \
>>>>         --with-sysroot=$DISTRO  \
>>>>         --disable-nls \
>>>>         --disable-werror
>>>>
>>>> && make -j6 && make -j1 install
>>>>
>>>> # Then I tried to build gcc like this
>>>>
>>>> ../configure                                       \
>>>>          --prefix=$DISTRO/tools                         \
>>>>          --with-glibc-version=2.11                      \
>>>>          --with-sysroot=$DISTRO                         \
>>>>          --with-newlib                                  \
>>>>          --without-headers                              \
>>>>          --enable-initfini-array                        \
>>>>          --disable-nls                                  \
>>>>          --disable-shared                               \
>>>>          --disable-multilib                             \
>>>>          --disable-decimal-float                        \
>>>>          --disable-threads                              \
>>>>          --disable-libatomic                            \
>>>>          --disable-libgomp                              \
>>>>          --disable-libquadmath                          \
>>>>          --disable-libssp                               \
>>>>          --disable-libvtv                               \
>>>>          --disable-libstdcxx                            \
>>>>          --enable-languages=c,c++
>>>>
>>>> && make -j6 && make -j1 install
>>>>
>>>> But this fails with a bunch of undefined references to the ZSTD
>>>> namespace such as ZSTD_getErrorName from gcc/lto-compress.c. I assume
>>>> this means that ./configure has detected that my host system has libzstd
>>>> but it's trying to look for them in the sysroot, where it obviously
>>>> can't find them. This happens even if I use --disable-lto.
>>>>
>>>> Build System (Arch Linux): linux 5.13.13, glibc 2.33, binutils 2.36.1,
>>>> gcc 11.1.0
>>>> Target System: linux 5.13.12, glibc 2.34, binutils 2.37, gcc 11.2.0
>>>>
>>>> So I'd like to know if I should continue like this, and if so how, or if
>>>> there is a better (maybe canonical) way of building a host-isolated
>>>> compiler?
>>>>
>>>> - Anthony
>>>>
>>>>

Re: Building a host-isolated gcc without faking cross-compiling

[Xi Ruoyao]

On Sat, 2021-09-11 at 04:55 +0000, Anthony de Almeida Lopes via Gcc-help
wrote:
> Alright, progress. I'm still researching the next problems that I ran
> into but I thought I'd post an update. First, I ran into
> GCC_NO_EXECUTABLES while the build was in configure-stage2-zlib and in
> anticipating what Lance might say to that, I checked and there doesn't
> seem to be a --without-zlib although I did test that just in case and
> it
> did nothing. The best explanation for what GCC_NO_EXECUTABLES is that
> I
> found so far is in a post to the list about a similar problem:
> 
> https://gcc.gnu.org/legacy-ml/gcc/2008-03/msg00515.html
> 
> I went ahead and built it anyway with --disable-bootstrap. glibc
> compiled but not too surprisingly running ldd or /usr/lib/libc.so.6
> with
> LD_LIBRARY_PATH to $DISTRO/usr/lib just segfaults, so it seems like it
> wasn't really a sane build of gcc after all.
> 
> Ignoring that problem, configuring libstdc++-v3 after having glibc
> fails
> which is kind of obvious since the host glibc differs in version from
> the target version. You know, the typical "version `GLIBC_2.34' not
> found" errors. This seems like a proper motivating reason for using
> the
> fake cross-compiling trick but I'm determined to figure out if there's
> a
> way around that.

As a LFS editor (and I also have several commits in GCC) I'd say there
is no rational way for this, expect cross-compilation.  Maybe you can
use a dozen of switches to accomplish the object, but at last it will be
almost equivelent to run a cross-compilation.
-- 
Xi Ruoyao <xry111@mengyan1223.wang>
School of Aerospace Science and Technology, Xidian University

Re: Building a host-isolated gcc without faking cross-compiling

[Anthony de Almeida Lopes]

Alright, fair enough, I surrender.

I did end up solving the GCC_NO_EXECUTABLE in a better way by just
including zlib in the source tree. I found the solution in this[1] bug
report from libdragon.

Then the reason things were crashing was my own fault: I incorrectly
assumed setting LD_LIBRARY_PATH would set the dynamic linker but it
doesn't do that. Running programs directly with the dynamic linker (like
`usr/lib/ld-linux-x86-64.so.2 usr/bin/ls`) works fine.

1. https://github.com/DragonMinded/libdragon/issues/22

- Anthony


On 9/11/21 10:32 AM, Xi Ruoyao wrote:
> On Sat, 2021-09-11 at 04:55 +0000, Anthony de Almeida Lopes via Gcc-help
> wrote:
>> Alright, progress. I'm still researching the next problems that I ran
>> into but I thought I'd post an update. First, I ran into
>> GCC_NO_EXECUTABLES while the build was in configure-stage2-zlib and in
>> anticipating what Lance might say to that, I checked and there doesn't
>> seem to be a --without-zlib although I did test that just in case and
>> it
>> did nothing. The best explanation for what GCC_NO_EXECUTABLES is that
>> I
>> found so far is in a post to the list about a similar problem:
>>
>> https://gcc.gnu.org/legacy-ml/gcc/2008-03/msg00515.html
>>
>> I went ahead and built it anyway with --disable-bootstrap. glibc
>> compiled but not too surprisingly running ldd or /usr/lib/libc.so.6
>> with
>> LD_LIBRARY_PATH to $DISTRO/usr/lib just segfaults, so it seems like it
>> wasn't really a sane build of gcc after all.
>>
>> Ignoring that problem, configuring libstdc++-v3 after having glibc
>> fails
>> which is kind of obvious since the host glibc differs in version from
>> the target version. You know, the typical "version `GLIBC_2.34' not
>> found" errors. This seems like a proper motivating reason for using
>> the
>> fake cross-compiling trick but I'm determined to figure out if there's
>> a
>> way around that.
> As a LFS editor (and I also have several commits in GCC) I'd say there
> is no rational way for this, expect cross-compilation.  Maybe you can
> use a dozen of switches to accomplish the object, but at last it will be
> almost equivelent to run a cross-compilation.
> --
> Xi Ruoyao <xry111@mengyan1223.wang>
> School of Aerospace Science and Technology, Xidian University
>