Enable combining +crt-static and relocation-model=pic on x86_64-unknown-linux-gnu

compiler/rustc_target/src/spec/x86_64_unknown_linux_gnu.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
     base.pre_link_args.entry(LinkerFlavor::Gcc).or_default().push("-m64".to_string());
     // don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
     base.stack_probes = StackProbeType::Call;
+    base.static_position_independent_executables = true;
     base.supported_sanitizers = SanitizerSet::ADDRESS
         | SanitizerSet::CFI
         | SanitizerSet::LEAK

src/test/run-make/static-pie/Makefile

@@ -1,9 +1,11 @@
 -include ../../run-make-fulldeps/tools.mk
 
-# only-x86_64-unknown-linux-musl
+# only-x86_64
+# only-linux
+# ignore-gnux32
 
 # How to manually run this
-# $ ./x.py test --target x86_64-unknown-linux-musl src/test/run-make/static-pie
+# $ ./x.py test --target x86_64-unknown-linux-[musl,gnu] src/test/run-make/static-pie
 
 all:
 	$(RUSTC) --target $(TARGET) -C target-feature=+crt-static test-aslr.rs