Build Failures with CMake 3.12 and earlier #261
Description
Something changed with the cmake v0.1.55 release that's causing the CI for aws-lc-rs to fail when using older versions of CMake.
For example, CI for this PR successfully ran yesterday. But today, I started noticing strange CI failures, so I pushed a no-op change to it and the failures started showing up here as well:
https://github.com/aws/aws-lc-rs/actions/runs/20176069574/job/57924339340?pr=970
--- stderr
running: cd "/__w/aws-lc-rs/aws-lc-rs/target/debug/build/aws-lc-sys-82b618269e372d26/out/build" && CMAKE_PREFIX_PATH="" LC_ALL="C" "cmake" "/__w/aws-lc-rs/aws-lc-rs/aws-lc-sys" "-B" "/__w/aws-lc-rs/aws-lc-rs/target/debug/build/aws-lc-sys-82b618269e372d26/out/build" "-DBUILD_SHARED_LIBS=0" "-DBORINGSSL_PREFIX=aws_lc_0_34_0_" "-DBORINGSSL_PREFIX_HEADERS=/__w/aws-lc-rs/aws-lc-rs/aws-lc-sys/generated-include" "-DBUILD_TESTING=OFF" "-DBUILD_TOOL=OFF" "-DENABLE_SOURCE_MODIFICATION=OFF" "-DBUILD_LIBSSL=OFF" "-DDISABLE_PERL=ON" "-DDISABLE_GO=ON" "-DCMAKE_C_STANDARD=99" "-DCMAKE_INSTALL_PREFIX=/__w/aws-lc-rs/aws-lc-rs/target/debug/build/aws-lc-sys-82b618269e372d26/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_C_COMPILER=/usr/bin/cc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_CXX_COMPILER=/usr/bin/c++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_ASM_COMPILER=/usr/bin/cc" "-DCMAKE_BUILD_TYPE=Debug" "--no-warn-unused-cli"
CMake Error: The source directory "/__w/aws-lc-rs/aws-lc-rs/target/debug/build/aws-lc-sys-82b618269e372d26/out/build" does not appear to contain CMakeLists.txt.
I've not yet isolated the specific problem, as I don't have an environment setup to reproduce it. I will update this Issue w/ more information once I have it.