Disable AVX512 for aws-lc on old GCC (#468)

.github/workflows/ci.yml

@@ -19,6 +19,24 @@ env:
   AWS_REGION: us-east-1
 
 jobs:
+  manylinux1:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        image:
+          - x64
+          - x86
+        python:
+          - cp37-cp37m
+          - cp38-cp38
+          - cp39-cp39
+    steps:
+    - name: Build ${{ env.PACKAGE_NAME }}
+      run: |
+        aws s3 cp s3://aws-crt-test-stuff/ci/${{ env.BUILDER_VERSION }}/linux-container-ci.sh ./linux-container-ci.sh && chmod a+x ./linux-container-ci.sh
+        ./linux-container-ci.sh ${{ env.BUILDER_VERSION }} aws-crt-manylinux1-${{ matrix.image }} build -p ${{ env.PACKAGE_NAME }} --python /opt/python/${{ matrix.python }}/bin/python
+
   manylinux2014:
     runs-on: ubuntu-20.04 # latest
     strategy:

crt/CMakeLists.txt

@@ -33,8 +33,15 @@ if(UNIX AND NOT APPLE)
 
     if(NOT USE_OPENSSL)
         set(DISABLE_GO ON CACHE BOOL "Build without using Go, we don't want the extra dependency")
-        set(DISABLE_PERL ON CACHE BOOL "Build without using Perl, we don't want the extra dependency")
         set(BUILD_LIBSSL OFF CACHE BOOL "Don't need libssl, only need libcrypto")
+
+        if(CMAKE_C_COMPILER_ID MATCHES "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_LESS "5.0")
+            set(DISABLE_PERL OFF CACHE BOOL "Build with Perl to avoid using pre-compiled binary with AVX512")
+            set(MY_ASSEMBLER_IS_TOO_OLD_FOR_512AVX ON CACHE BOOL "Disable AVX512 on old GCC that not supports it")
+        else()
+            set(DISABLE_PERL ON CACHE BOOL "Build without using Perl, we don't want the extra dependency")
+        endif()
+
         add_subdirectory(aws-lc)
     endif()