build: improve linker script and target settings

.travis.yml

@@ -22,7 +22,7 @@ install:
 
 script:
   - cargo xbuild --release --target target.json
-  - cargo xclippy
+  - cargo xclippy --target target.json
   - cargo clippy --all-targets --all-features
   - cargo fmt --all -- --check
   - cargo test

Cargo.toml

@@ -4,14 +4,14 @@ version = "0.1.0"
 authors = ["Rob Bradford <[email protected]>"]
 edition = "2018"
 
-# the profile used for `cargo build`
+# Despite "panic-strategy": "abort" being set in target.json, panic = "abort" is
+# needed here to make "cargo check" and "cargo clippy" run without errors.
 [profile.dev]
-panic = "abort" # disable stack unwinding on panic
+panic = "abort"
 lto = true
 
-# the profile used for `cargo build --release`
 [profile.release]
-panic = "abort" # disable stack unwinding on panic
+panic = "abort"
 lto = true
 
 [dependencies]

layout.ld

@@ -15,10 +15,9 @@ SECTIONS
 	/* Mapping in the program headers makes it easier to mmap the whole file. */
 	. += SIZEOF_HEADERS ;
 
-	.rodata : { *(.rodata .rodata.*) } :rodata
-	.data   : { *(.data .data.*)     } :data
-	.bss    : { *(.bss .bss.*)       } :data
-	.text   : { *(.text .text.*)     } :text
+	.rodata : { *(.rodata .rodata.*)            } :rodata
+	.data   : { *(.data .data.*) *(.bss .bss.*) } :data
+	.text   : { *(.text .text.*)                } :text
 
 	_end_of_file = . ;
 

target.json

@@ -12,8 +12,12 @@
   "panic-strategy": "abort",
   "disable-redzone": true,
   "features": "-mmx,-sse,+soft-float",
+  "dynamic-linking-available": false,
+  "code-model": "small",
+  "relocation-model": "static",
   "pre-link-args": {
     "ld.lld": [
+      "-s",
       "--script=layout.ld"
     ]
   }