Enables GCC's Link-Time Optimization with tiny profile

Jenkinsfile

@@ -88,7 +88,7 @@ def bootloaderBuildStep(stepName,
           // build with default setup
           sh ("""
             mbed --version
-            mbed compile -m ${target} -t ${toolchain} --app-config ${mbed_app_json} --build ${build_dir} --profile release
+            mbed compile -m ${target} -t ${toolchain} --app-config ${mbed_app_json} --build ${build_dir} --profile tiny.json
           """)
 
           // Archive the binary

tiny.json

@@ -0,0 +1,63 @@
+{
+    "GCC_ARM": {
+        "common": ["-Wall", "-Wextra",
+                   "-Wno-unused-parameter", "-Wno-missing-field-initializers",
+                   "-fmessage-length=0", "-fno-exceptions", "-fno-builtin",
+                   "-ffunction-sections", "-fdata-sections", "-funsigned-char",
+                   "-MMD", "-fno-delete-null-pointer-checks",
+                   "-fomit-frame-pointer", "-Os", "-flto", "-DNDEBUG", "-g"],
+        "asm": ["-c", "-x", "assembler-with-cpp"],
+        "c": ["-c", "-std=gnu11"],
+        "cxx": ["-c", "-std=gnu++14", "-fno-rtti", "-Wvla"],
+        "ld": ["-Wall", "-Wextra",
+               "-Wno-unused-parameter", "-Wno-missing-field-initializers",
+               "-fmessage-length=0", "-fno-exceptions", "-fno-builtin",
+               "-ffunction-sections", "-fdata-sections", "-funsigned-char",
+               "-MMD", "-fno-delete-null-pointer-checks",
+               "-fomit-frame-pointer", "-Os", "-flto", "-DNDEBUG", "-g",
+               "-Wl,--gc-sections", "-Wl,--wrap,main", "-Wl,--wrap,_malloc_r",
+               "-Wl,--wrap,_free_r", "-Wl,--wrap,_realloc_r",
+               "-Wl,--wrap,_calloc_r", "-Wl,--wrap,exit", "-Wl,--wrap,atexit",
+               "-u main"]
+    },
+    "ARM": {
+        "common": ["-c", "--gnu", "-Ospace", "--split_sections",
+                   "--apcs=interwork", "--brief_diagnostics", "--restrict",
+                   "--multibyte_chars", "-O3", "-DNDEBUG"],
+        "asm": [],
+        "c": ["--md", "--no_depend_system_headers", "--c99", "-D__ASSERT_MSG"],
+        "cxx": ["--cpp11", "--no_rtti", "--no_vla"],
+        "ld": []
+    },
+    "uARM": {
+        "common": ["-c", "--gnu", "-Ospace", "--split_sections",
+                   "--apcs=interwork", "--brief_diagnostics", "--restrict",
+                   "--multibyte_chars", "-O3", "-D__MICROLIB",
+                   "--library_type=microlib", "-DMBED_RTOS_SINGLE_THREAD", "-DNDEBUG"],
+        "asm": [],
+        "c": ["--md", "--no_depend_system_headers", "--c99", "-D__ASSERT_MSG"],
+        "cxx": ["--cpp11", "--no_rtti", "--no_vla"],
+        "ld": ["--library_type=microlib"]
+    },
+    "IAR": {
+        "common": [
+            "--no_wrap_diagnostics", "-e",
+            "--diag_suppress=Pa050,Pa084,Pa093,Pa082,Pe540", "-Ohz", "-DNDEBUG", "--enable_restrict"],
+        "asm": [],
+        "c": ["--vla", "--diag_suppress=Pe546"],
+        "cxx": ["--guard_calls", "--no_static_destruction"],
+        "ld": ["--skip_dynamic_initialization", "--threaded_lib"]
+    },
+    "ARMC6": {
+        "common": ["-c", "--target=arm-arm-none-eabi", "-mthumb", "-Oz",
+                   "-Wno-armcc-pragma-push-pop", "-Wno-armcc-pragma-anon-unions",
+                   "-Wno-reserved-user-defined-literal", "-Wno-deprecated-register",
+                   "-DMULADDC_CANNOT_USE_R7", "-fdata-sections",
+                   "-fno-exceptions", "-MMD", "-D_LIBCPP_EXTERN_TEMPLATE(...)=",
+                   "-fshort-enums", "-fshort-wchar", "-DNDEBUG"],
+        "asm": [],
+        "c": ["-D__ASSERT_MSG", "-std=gnu11"],
+        "cxx": ["-fno-rtti", "-std=gnu++14"],
+        "ld": ["--show_full_path"]
+    }
+}