Tool chain 'gcc' (GNU GCC): Don't know how to build for platform 'linux_aarch64'

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Working on the same problem. You can get past this error with the following:

toolChains {
    // If you have both VC and Gcc installed, VC will be selected, unless you
    // set 'vcDisable=true'
    if (!vcDisable) {
      visualCpp(VisualCpp) {
      }
    }
    clang(Clang)
    gcc(Gcc){
        target("linux_aarch64") {
	        cppCompiler.executable = "/usr/bin/gcc"
	    }
    }
    
  }

EDIT: got it fixed!

First, I’m working on branch v0.13.2 because that’s what I need to compile bazel to compile tensorflow.

diff --git a/compiler/build.gradle b/compiler/build.gradle
index a487992..f1d593b 100644
--- a/compiler/build.gradle
+++ b/compiler/build.gradle
@@ -46,10 +46,13 @@ model {
       visualCpp(VisualCpp) {
       }
     }
-    gcc(Gcc) {
-    }
-    clang(Clang) {
+    clang(Clang)
+    gcc(Gcc){
+        target("linux_aarch64") {
+	        cppCompiler.executable = "/usr/bin/gcc"
+	    }
     }
+    
   }
 
   platforms {
@@ -59,11 +62,15 @@ model {
     x86_64 {
       architecture "x86_64"
     }
+    linux_aarch64 {
+      architecture "arm64"
+      operatingSystem "linux"
+    }
   }
 
   components {
     java_plugin(NativeExecutableSpec) {
-      if (arch in ['x86_32', 'x86_64']) {
+      if (arch in ['x86_32', 'x86_64', 'arm64']) {
         // If arch is not within the defined platforms, we do not specify the
         // targetPlatform so that Gradle will choose what is appropriate.
         targetPlatform arch
@@ -91,7 +98,7 @@ model {
           // Clang under OSX doesn't support these options.
           linker.args "-Wl,-Bstatic", "-lprotoc", "-lprotobuf", "-static-libgcc",
                       "-static-libstdc++",
-                      "-Wl,-Bdynamic", "-lpthread", "-s"
+                      "-lpthread", "-lc", "-s", "-static"
         }
         addEnvArgs("LDFLAGS", linker.args)
       } else if (toolChain in VisualCpp) {

I don’t know if I needed to change the linker options, but I figured it couldn’t hurt based on some of the bazel docs.

Also, here’s my gradle.properties file
skipCodegen=false
protoc=/usr/bin/protoc

Where the /usr/bin/protoc was a custom compiled version as described in the grpc-java docs.

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