Merge pull request #17 from arduino/fix-lto

Fix lto

Author: pennam

README.md

@@ -111,7 +111,7 @@ The following command will setup the mbed environment and clone the needed repos
 
 ```
 mbed config root . && mbed deploy
-mbed compile -m PORTENTA_H7_M7 -t GCC_ARM --profile=release --profile mbed-os/tools/profiles/extensions/lto.json
+mbed compile -m PORTENTA_H7_M7 -t GCC_ARM --profile=release --profile custom.json
 ```
 Additional flags are needed for [Lite](generate_rel.sh#L24), [Lite Connected](generate_rel.sh#L35) and [Nicla Vision](generate_rel.sh#L46) boards.
 

custom.json

@@ -0,0 +1,58 @@
+{
+    "GCC_ARM": {
+        "common": ["-Wall", "-Wextra",
+                   "-Wno-unused-parameter", "-Wno-missing-field-initializers",
+                   "-fmessage-length=0", "-fno-exceptions",
+                   "-ffunction-sections", "-fdata-sections", "-funsigned-char",
+                   "-MMD", "-flto",
+                   "-fomit-frame-pointer", "-Os", "-DNDEBUG", "-g"],
+        "asm": ["-c", "-x", "assembler-with-cpp"],
+        "c": ["-c", "-std=gnu11"],
+        "cxx": ["-c", "-std=gnu++14", "-fno-rtti", "-Wvla"],
+        "ld": ["-Wl,--gc-sections", "-Wl,--wrap,main", "-Wl,--wrap,_malloc_r",
+               "-Wl,--wrap,_free_r", "-Wl,--wrap,_realloc_r", "-Wl,--wrap,_memalign_r",
+               "-Wl,--wrap,_calloc_r", "-Wl,--wrap,exit", "-Wl,--wrap,atexit",
+               "-Wl,-n", "-u __wrap_printf", "-u main", "-u malloc", "-u __wrap_snprintf", "-u _malloc_r"]
+    },
+    "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", "-fshort-enums", "-fshort-wchar",
+                   "-DNDEBUG"],
+        "asm": [],
+        "c": ["-D__ASSERT_MSG", "-std=gnu11"],
+        "cxx": ["-fno-rtti", "-std=gnu++14"],
+        "ld": ["--show_full_path", "--legacyalign", "--any_contingency",
+               "--keep=os_cb_sections"]
+    },
+    "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": ["--show_full_path", "--any_contingency", "--keep=os_cb_sections"]
+    },
+    "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", "--inline"]
+    }
+}