Add option to modify debug flags

Some bare metal runtimes require custom debug flags. To
fulfil that requirement the debug flags are now configurable
via common_debug_flags analogous to common_flags.

ref eng/cert/certified-rts#18

support/bsp_sources/target.py

@@ -168,6 +168,7 @@ def __init__(self):
  'common_flags': ['-ffunction-sections',
  '-fdata-sections'],
  'common_gnarl_flags': [],
+ 'common_debug_flags': ['-g'],
  'asm_flags': [],
  'c_flags': ['-DIN_RTS', '-Dinhibit_libc', '-DLIGHT_RUNTIME']}
  # GNAT-LLVM doesn't support -fcallgraph-info

support/data/target_options.gpr.in

@@ -16,6 +16,7 @@ abstract project Target_Options is
  -- COMFLAGS here is common flags (used for C and Ada).
  COMFLAGS := ("{common_flags}");
  COMGNARLFLAGS := ("{common_gnarl_flags}");
+ COMDEBUGFLAGS := ("{common_debug_flags}");
 
  -- Per language flags (COMFLAGS will be added later)
  ADAFLAGS := ("-gnatg", "-nostdinc", "-fno-delete-null-pointer-checks");
@@ -28,17 +29,17 @@ abstract project Target_Options is
  ADAFLAGS := ADAFLAGS & ("-gnatp", "-gnatn2");
  when "Debug" =>
  -- Disable optimization and add debug symbols
- COMFLAGS := COMFLAGS & ("-O0", "-g");
- ASMFLAGS := ASMFLAGS & ("-g");
+ COMFLAGS := COMFLAGS & COMDEBUGFLAGS & ("-O0");
+ ASMFLAGS := ASMFLAGS & COMDEBUGFLAGS;
  when "Assert" =>
  -- Possibly enable assertions. This might use too much memory on
  -- some systems or could be too slow.
  COMFLAGS := COMFLAGS & ("-O");
  ADAFLAGS := ADAFLAGS & ("-gnata");
  when "Gnatcov" =>
  -- For coverage
- COMFLAGS := COMFLAGS & ("-O0", "-g", "-fdump-scos",
-   "-fpreserve-control-flow");
+ COMFLAGS := COMFLAGS & COMDEBUGFLAGS &
+ ("-O0", "-fdump-scos", "-fpreserve-control-flow");
  end case;
  -- Linker flags, used for building shared libraries
  LOPTIONS := ();