diff --git a/support/bsp_sources/installer.py b/support/bsp_sources/installer.py
index 82a5e3dc..10cc492d 100644
--- a/support/bsp_sources/installer.py
+++ b/support/bsp_sources/installer.py
@@ -267,11 +267,11 @@ def install(self, destination, rts_descriptor=None):
 
             # And generate the project files used to build the rts
 
-            build_flags = {}
-            for f in ['common_flags', 'common_gnarl_flags',
-                      'asm_flags', 'c_flags']:
-                build_flags[f] = '",\n        "'.join(rts_obj.build_flags[f])
-            cnt = readfile(getdatafilepath('target_options.gpr'))
+            build_flags = {
+                f: '",\n        "'.join(rts_obj.build_flags[f])
+                for f in rts_obj.build_flags if f.endswith('_flags')
+            }
+            cnt = readfile(getdatafilepath('target_options.gpr.in'))
             build_flags["gnat_version"] = runtime_sources.version
             # Format
             cnt = cnt.format(**build_flags)
diff --git a/support/bsp_sources/target.py b/support/bsp_sources/target.py
index b79423be..97bdf43e 100644
--- a/support/bsp_sources/target.py
+++ b/support/bsp_sources/target.py
@@ -162,10 +162,13 @@ def __init__(self):
 
         self.rts_options = RTSProfiles(self)
 
+        # Flags for keys in target_options.gpr.in must end in _flags. This is
+        # to avoid duplicating the list of flags in support/bsp_sources/installer.py.
         self.build_flags = {'source_dirs': None,
                             '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
diff --git a/support/data/target_options.gpr b/support/data/target_options.gpr.in
similarity index 89%
rename from support/data/target_options.gpr
rename to support/data/target_options.gpr.in
index e99d4d0b..a83c6405 100644
--- a/support/data/target_options.gpr
+++ b/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");
@@ -28,8 +29,8 @@ 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.
@@ -37,8 +38,8 @@ abstract project Target_Options is
         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 := ();