Add a feature to compile intrinsics that are missing on the system fo…

…r testing

Cargo.toml

@@ -39,7 +39,7 @@ cc = { optional = true, version = "1.0" }
 panic-handler = { path = 'crates/panic-handler' }
 
 [features]
-default = ["compiler-builtins"]
+default = ["compiler-builtins", "complete-system-rt"]
 
 # Enable compilation of C code in compiler-rt, filling in some more optimized
 # implementations and also filling in unimplemented intrinsics
@@ -77,6 +77,12 @@ public-test-deps = []
 # it during linking.
 weak-intrinsics = []
 
+# On some systems, there are no symbols available in their vendored compiler-rt
+# that we would want to use for testing, e.g. MacOS does not provide `f128`
+# intrinsics. Enabling this feature builds missing symbols from C so we have
+# something to test against.
+complete-system-rt = ["cc"]
+
 [[example]]
 name = "intrinsics"
 required-features = ["compiler-builtins"]

build.rs

@@ -463,6 +463,7 @@ mod c {
 
         if (target_arch == "aarch64" || target_arch == "arm64ec") && consider_float_intrinsics {
             sources.extend(&[
+                ("__comparetf2", "comparetf2.c"),
                 ("__extenddftf2", "extenddftf2.c"),
                 ("__extendsftf2", "extendsftf2.c"),
                 ("__fixtfdi", "fixtfdi.c"),
@@ -499,11 +500,15 @@ mod c {
             sources.extend(&[
                 ("__extenddftf2", "extenddftf2.c"),
                 ("__netf2", "comparetf2.c"),
+                ("__addtf3", "addtf3.c"),
+                ("__multf3", "multf3.c"),
+                ("__subtf3", "subtf3.c"),
                 ("__fixtfsi", "fixtfsi.c"),
                 ("__floatsitf", "floatsitf.c"),
                 ("__fixunstfsi", "fixunstfsi.c"),
                 ("__floatunsitf", "floatunsitf.c"),
                 ("__fe_getround", "fp_mode.c"),
+                ("__divtf3", "divtf3.c"),
                 ("__trunctfdf2", "trunctfdf2.c"),
                 ("__trunctfsf2", "trunctfsf2.c"),
             ]);
@@ -513,11 +518,15 @@ mod c {
             sources.extend(&[
                 ("__extenddftf2", "extenddftf2.c"),
                 ("__netf2", "comparetf2.c"),
+                ("__addtf3", "addtf3.c"),
+                ("__multf3", "multf3.c"),
+                ("__subtf3", "subtf3.c"),
                 ("__fixtfsi", "fixtfsi.c"),
                 ("__floatsitf", "floatsitf.c"),
                 ("__fixunstfsi", "fixunstfsi.c"),
                 ("__floatunsitf", "floatunsitf.c"),
                 ("__fe_getround", "fp_mode.c"),
+                ("__divtf3", "divtf3.c"),
                 ("__trunctfdf2", "trunctfdf2.c"),
                 ("__trunctfsf2", "trunctfsf2.c"),
             ]);

testcrate/Cargo.toml

@@ -25,8 +25,9 @@ utest-cortex-m-qemu = { default-features = false, git = "https://github.com/japa
 utest-macros = { git = "https://github.com/japaric/utest" }
 
 [features]
-default = ["mangled-names"]
+default = ["mangled-names", "complete-system-rt"]
 c = ["compiler_builtins/c"]
 no-asm = ["compiler_builtins/no-asm"]
 mem = ["compiler_builtins/mem"]
 mangled-names = ["compiler_builtins/mangled-names"]
+complete-system-rt = ["compiler_builtins/complete-system-rt"]