Build fails when building with Yocto SDK

[adrianalin]

Problem:

I have a Yocto SDK that I use to build aws-lc-rs, dependencies are installed in the SDK (rust, cargo, bindgen). Build for aws-lc-rs fails because it has a custom build step that starts a new cmake process, without inheriting the current environment vars.

Relevant details

In order to build this crate I first source the Yocto SDK source /opt/weos/1.0.0/environment-setup-x86-64-v3-linux.
Than run cargo build (cargo is correctly detected from the SDK).
Trying to build aws-lc-sys/v0.25.0.

System information: for linux, below info can be collected by running uname -srvmp

• CPU architecture: (x86-64 cross compiling for x86_64 yocto built OS)
• OS: (Ubuntu 20.04,)

Build log:

• The issue is that it incorrectly links against host libs.

  Run Build Command(s):/opt/weos/1.0.0/sysroots/x86_64-weos-linux/usr/bin/make -f Makefile cmTC_2a142/fast && /opt/weos/1.0.0/sysroots/x86_64-weos-linux/usr/bin/make  -f CMakeFiles/cmTC_2a142.dir/build.make CMakeFiles/cmTC_2a142.dir/build
  make[1]: Entering directory '/home/user/workspace/aws-lc-rs/aws-lc-sys/aws-lc/CMakeFiles/CMakeTmp'
  /bin/sh: symbol lookup error: /opt/weos/1.0.0/sysroots/x86_64-weos-linux/usr/bin/../../lib/libc.so.6: undefined symbol: _dl_audit_symbind_alt, version GLIBC_PRIVATE

If I try to run the cmake command manually in the current shell, it works (because in the current shell I have sourced the yocto SDK):

CMAKE_PREFIX_PATH="" LC_ALL="C" "cmake" "/home/user/workspace/aws-lc-rs/aws-lc-sys" "-DBUILD_SHARED_LIBS=0" "-DCMAKE_BUILD_TYPE=debug" "-DBORINGSSL_PREFIX=aws_lc_0_25_0_" "-DBORINGSSL_PREFIX_HEADERS=/home/user/workspace/aws-lc-rs/aws-lc-sys/generated-include" "-DBUILD_TESTING=OFF" "-DBUILD_LIBSSL=OFF" "-DDISABLE_PERL=ON" "-DDISABLE_GO=ON" "-DCMAKE_SYSTEM_NAME=Linux" "-DCMAKE_SYSTEM_PROCESSOR=x86_64" "-DCMAKE_INSTALL_PREFIX=/home/user/workspace/aws-lc-rs/target/x86_64-we-linux-gnu/debug/build/aws-lc-sys-b986ccfa6d58587e/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 -ffunction-sections -fdata-sections -fPIC -gdwarf-4 -fno-omit-frame-pointer -m64 -std=c11 -I /home/user/workspace/aws-lc-rs/aws-lc-sys/generated-include -I /home/user/workspace/aws-lc-rs/aws-lc-sys/include -I /home/user/workspace/aws-lc-rs/aws-lc-sys/aws-lc/include -I /home/user/workspace/aws-lc-rs/aws-lc-sys/aws-lc/third_party/s2n-bignum/include -pipe -feliminate-unused-debug-types -Wno-unused-parameter -pthread -D_XOPEN_SOURCE=700 -DBORINGSSL_IMPLEMENTATION=1 -DBORINGSSL_PREFIX=aws_lc_0_25_0" "-DCMAKE_C_COMPILER=/opt/weos/1.0.0/sysroots/x86_64-weos-linux/usr/bin/x86_64-we-linux/x86_64-we-linux-gcc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 -pipe -feliminate-unused-debug-types" "-DCMAKE_CXX_COMPILER=/opt/weos/1.0.0/sysroots/x86_64-weos-linux/usr/bin/x86_64-we-linux/x86_64-we-linux-g++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 -ffunction-sections -fdata-sections -fPIC -gdwarf-4 -fno-omit-frame-pointer -m64 -std=c11 -I /home/user/workspace/aws-lc-rs/aws-lc-sys/generated-include -I /home/user/workspace/aws-lc-rs/aws-lc-sys/include -I /home/user/workspace/aws-lc-rs/aws-lc-sys/aws-lc/include -I /home/user/workspace/aws-lc-rs/aws-lc-sys/aws-lc/third_party/s2n-bignum/include -pipe -feliminate-unused-debug-types -Wno-unused-parameter -pthread -D_XOPEN_SOURCE=700 -DBORINGSSL_IMPLEMENTATION=1 -DBORINGSSL_PREFIX=aws_lc_0_25_0" "-DCMAKE_ASM_COMPILER=/opt/weos/1.0.0/sysroots/x86_64-weos-linux/usr/bin/x86_64-we-linux/x86_64-we-linux-gcc" "--no-warn-unused-cli"