Deprecate ICC compiler

.github/workflows/weekly.yml

@@ -108,7 +108,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        compiler: [icc, icx]
+        compiler: [icx]
+#       ICC is deprecated by Intel and breaks flatcc build which we likely won't fix.
+#              compiler: [icc, icx]
     steps:
       - name: Prepare
         run: |

README.md

@@ -2347,6 +2347,13 @@ See also [issue #274](https://github.com/dvidelabs/flatcc/issues/274).
 2024-10-03: Fix available on flatcc master branch when you read this.
 See also CHANGELOG comments for release 0.6.2.
 
+2024-03-11:
+Intel ICC compiler is deprecated by Intel and the above fix breaks it,
+at least for version 2021.4.0 used in current CI build where it is now disabled.
+The ICC compiler does not truthfully expose __has_builtin and __has_attribute
+which is probably why it fails, but it is hardly worth fixing at this point.
+(The cause is suspected to be a call to unimplemented __builtin_memcpy).
+Use the Intel ICX compiler instead.
 
 The option `FLATCC_RTONLY` will disable tests and only build the runtime
 library.