Cross compile Problem

[moondayyy]

Problem: I want to cross compile the msquic library, but I get the following error. (I tried with build.ps1, I get the same error)
Input:
cmake -DCMAKE_C_COMPILER=/usr/bin/aarch64-linux-gnu-gcc -DCMAKE_CXX_COMPILER=/usr/bin/aarch64-linux-gnu-g++ -DCMAKE_TARGET_ARCHITECTURE=arm64 ../.. && make && make install
Output:

-- CMAKE Version: 3.22.1
-- Source Dir: /tmp/msquic
-- Host System name: Linux
-- Setting policy 0091
-- The C compiler identification is GNU 11.3.0
-- The CXX compiler identification is GNU 11.3.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/aarch64-linux-gnu-g++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- System name: Linux
-- System version: 5.10.16.3-microsoft-standard-WSL2
-- Platform version: 
-- Build type: Release
-- QUIC Platform: linux
-- Version Build ID: 0
-- Version Suffix: -private
-- Looking for _SC_PHYS_PAGES
-- Looking for _SC_PHYS_PAGES - found
-- Looking for sysconf
-- Looking for sysconf - found
-- Looking for UDP_SEGMENT
-- Looking for UDP_SEGMENT - found
-- Looking for SO_ATTACH_REUSEPORT_CBPF
-- Looking for SO_ATTACH_REUSEPORT_CBPF - found
-- Looking for sendmmsg
-- Looking for sendmmsg - found
-- Enabling OpenSsl configuration tests
-- Enabling CA file tests
-- QUIC_ENABLE_LOGGING is false. Disabling logging
-- libatomic not found. If build fails, install libatomic
-- libnuma not found. If build fails, install libnuma
-- Enabling shared ephemeral port work around
-- Configuring for OpenSSL 1.1
qemu-aarch64: Could not open '/lib/ld-linux-aarch64.so.1': No such file or directory
-- Setting openssldir to default /usr/local/ssl
-- Configuring OpenSSL: /tmp/msquic/submodules/openssl/Configure;linux-aarch64 enable-tls1_3;no-makedepend;no-dgram;no-ssl3;no-psk;no-srp;no-zlib;no-egd;no-idea;no-rc5;no-rc4;no-afalgeng;no-comp;no-cms;no-ct;no-srp;no-srtp;no-ts;no-gost;no-dso;no-ec2m;no-tls1;no-tls1_1;no-tls1_2;no-dtls;no-dtls1;no-dtls1_2;no-ssl;no-ssl3-method;no-tls1-method;no-tls1_1-method;no-tls1_2-method;no-dtls1-method;no-dtls1_2-method;no-siphash;no-whirlpool;no-aria;no-bf;no-blake2;no-sm2;no-sm3;no-sm4;no-camellia;no-cast;no-md4;no-mdc2;no-ocb;no-rc2;no-rmd160;no-scrypt;no-seed;no-weak-ssl-ciphers;no-shared;no-tests;--openssldir=/usr/local/ssl;--prefix=/tmp/msquic/builds/aarch64/_deps/opensslquic-build/openssl;-latomic
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
-- Configuring for OpenSSL
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/msquic/builds/aarch64
[  1%] Building C object src/core/CMakeFiles/core.dir/ack_tracker.c.o
[  3%] Building C object src/core/CMakeFiles/core.dir/api.c.o
[  5%] Building C object src/core/CMakeFiles/core.dir/binding.c.o
[  6%] Building C object src/core/CMakeFiles/core.dir/configuration.c.o
[  8%] Building C object src/core/CMakeFiles/core.dir/congestion_control.c.o
[ 10%] Building C object src/core/CMakeFiles/core.dir/connection.c.o
[ 12%] Building C object src/core/CMakeFiles/core.dir/crypto.c.o
[ 13%] Building C object src/core/CMakeFiles/core.dir/crypto_tls.c.o
[ 15%] Building C object src/core/CMakeFiles/core.dir/cubic.c.o
[ 17%] Building C object src/core/CMakeFiles/core.dir/bbr.c.o
[ 18%] Building C object src/core/CMakeFiles/core.dir/datagram.c.o
[ 20%] Building C object src/core/CMakeFiles/core.dir/frame.c.o
[ 22%] Building C object src/core/CMakeFiles/core.dir/library.c.o
[ 24%] Building C object src/core/CMakeFiles/core.dir/listener.c.o
[ 25%] Building C object src/core/CMakeFiles/core.dir/lookup.c.o
[ 27%] Building C object src/core/CMakeFiles/core.dir/loss_detection.c.o
[ 29%] Building C object src/core/CMakeFiles/core.dir/mtu_discovery.c.o
[ 31%] Building C object src/core/CMakeFiles/core.dir/operation.c.o
[ 32%] Building C object src/core/CMakeFiles/core.dir/packet.c.o
[ 34%] Building C object src/core/CMakeFiles/core.dir/packet_builder.c.o
[ 36%] Building C object src/core/CMakeFiles/core.dir/packet_space.c.o
[ 37%] Building C object src/core/CMakeFiles/core.dir/path.c.o
[ 39%] Building C object src/core/CMakeFiles/core.dir/range.c.o
[ 41%] Building C object src/core/CMakeFiles/core.dir/recv_buffer.c.o
[ 43%] Building C object src/core/CMakeFiles/core.dir/registration.c.o
[ 44%] Building C object src/core/CMakeFiles/core.dir/send.c.o
[ 46%] Building C object src/core/CMakeFiles/core.dir/send_buffer.c.o
[ 48%] Building C object src/core/CMakeFiles/core.dir/sent_packet_metadata.c.o
[ 50%] Building C object src/core/CMakeFiles/core.dir/settings.c.o
[ 51%] Building C object src/core/CMakeFiles/core.dir/stream.c.o
[ 53%] Building C object src/core/CMakeFiles/core.dir/stream_recv.c.o
[ 55%] Building C object src/core/CMakeFiles/core.dir/stream_send.c.o
[ 56%] Building C object src/core/CMakeFiles/core.dir/stream_set.c.o
[ 58%] Building C object src/core/CMakeFiles/core.dir/timer_wheel.c.o
[ 60%] Building C object src/core/CMakeFiles/core.dir/worker.c.o
[ 62%] Building C object src/core/CMakeFiles/core.dir/version_neg.c.o
[ 63%] Building C object src/core/CMakeFiles/core.dir/sliding_window_extremum.c.o
[ 65%] Building C object src/core/CMakeFiles/core.dir/inline.c.o
[ 67%] Linking C static library ../../obj/Release/libcore.a
[ 67%] Built target core
[ 68%] OpenSSL configure
Configuring OpenSSL version 1.1.1t+quic (0x1010114fL) for linux-aarch64
Using os-specific seed configuration
Creating configdata.pm
Creating Makefile

**********************************************************************
***                                                                ***
***   OpenSSL has been successfully configured                     ***
***                                                                ***
***   If you encounter a problem while building, please open an    ***
***   issue on GitHub <https://github.com/openssl/openssl/issues>  ***
***   and include the output from the following command:           ***
***                                                                ***
***       perl configdata.pm --dump                                ***
***                                                                ***
***   (If you are new to OpenSSL, you might want to consult the    ***
***   'Troubleshooting' section in the INSTALL file first)         ***
***                                                                ***
**********************************************************************
[ 70%] OpenSSL build
In file included from ../../../../../../submodules/openssl/apps/app_rand.c:10:
../../../../../../submodules/openssl/apps/apps.h:13:11: fatal error: e_os.h: No such file or directory
   13 | # include "e_os.h" /* struct timeval for DTLS */
      |           ^~~~~~~~
compilation terminated.
In file included from ../../../../../../submodules/openssl/apps/opt.c:9:
../../../../../../submodules/openssl/apps/apps.h:13:11: fatal error: e_os.h: No such file or directory
   13 | # include "e_os.h" /* struct timeval for DTLS */
      |           ^~~~~~~~
compilation terminated.
make[4]: *** [Makefile:661: apps/app_rand.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[4]: *** [Makefile:667: apps/opt.o] Error 1
In file included from ../../../../../../submodules/openssl/apps/s_cb.c:14:
../../../../../../submodules/openssl/apps/apps.h:13:11: fatal error: e_os.h: No such file or directory
   13 | # include "e_os.h" /* struct timeval for DTLS */
      |           ^~~~~~~~
compilation terminated.
make[4]: *** [Makefile:669: apps/s_cb.o] Error 1
In file included from ../../../../../../submodules/openssl/apps/s_socket.c:31:
../../../../../../submodules/openssl/apps/apps.h:13:11: fatal error: e_os.h: No such file or directory
   13 | # include "e_os.h" /* struct timeval for DTLS */
      |           ^~~~~~~~
compilation terminated.
make[4]: *** [Makefile:671: apps/s_socket.o] Error 1
In file included from ../../../../../../submodules/openssl/apps/bf_prefix.c:14:
../../../../../../submodules/openssl/apps/apps.h:13:11: fatal error: e_os.h: No such file or directory
   13 | # include "e_os.h" /* struct timeval for DTLS */
      |           ^~~~~~~~
compilation terminated.
make[4]: *** [Makefile:665: apps/bf_prefix.o] Error 1
In file included from ../../../../../../submodules/openssl/apps/apps.c:43:
../../../../../../submodules/openssl/apps/apps.h:13:11: fatal error: e_os.h: No such file or directory
   13 | # include "e_os.h" /* struct timeval for DTLS */
      |           ^~~~~~~~
compilation terminated.
make[4]: *** [Makefile:663: apps/apps.o] Error 1
make[3]: *** [Makefile:175: build_libs] Error 2
make[2]: *** [_deps/opensslquic-build/CMakeFiles/OpenSSL_Target.dir/build.make:74: _deps/opensslquic-build/openssl/lib/libssl.a] Error 2
make[1]: *** [CMakeFiles/Makefile2:188: _deps/opensslquic-build/CMakeFiles/OpenSSL_Target.dir/all] Error 2
make: *** [Makefile:146: all] Error 2

Input:
uname -a
Output:
Linux 57d29300a886 5.10.16.3-microsoft-standard-WSL2 #1 SMP Fri Apr 2 22:23:49 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

[moondayyy]

Fixed

[nibanks]

What did you have to do to fix your errors?

[moondayyy]

I solved it by setting the CXX and CC variables of the library to be compiled to environment while cross compile.
Ex:
Aarch64 gcc for aarch64 or x86_64 gcc for x86_64 must be set.