diff --git a/redo/rules/build_executable.py b/redo/rules/build_executable.py
index 7061f33..b8e2bad 100644
--- a/redo/rules/build_executable.py
+++ b/redo/rules/build_executable.py
@@ -207,7 +207,7 @@ def _build(self, redo_1, redo_2, redo_3):
         source_dir = os.path.dirname(source_to_compile)
 
         # Find any C objects that need to be linked against so that we can
-        # tell GPRbuild to link with them.
+        # tell gprbuild to link with them.
         with c_source_database() as db:
             c_objects = db.get_all_objects(build_target)
         existing_c_objects = [ofile for ofile in c_objects if os.path.isfile(ofile)]
@@ -215,6 +215,26 @@ def _build(self, redo_1, redo_2, redo_3):
             set([redo_arg.get_src_dir(obj) for obj in existing_c_objects])
         )
 
+        # Gprbuild will try to link to all C/C++ objects that it finds source
+        # files for in directories in c_source_path. However, we often only want to link
+        # with some of these files, not all. In order to tell gprbuild to not
+        # link with everything we need to create a list of files for it to
+        # exclude.
+        existing_c_basenames = [os.path.basename(os.path.splitext(ofile)[0]) for ofile in existing_c_objects]
+        source_extensions = ['.h', '.c', '.cpp', '.hpp', '.s', '.S']
+        c_source_exclude = []
+
+        # Iterate over each directory in the C source path list
+        for directory in c_source_path:
+            # Walk the directory and find all files
+            for root, _, files in os.walk(directory):
+                for file in files:
+                    # Check if the file has one of the supported extensions
+                    basename, fext = os.path.splitext(file)
+                    if fext in source_extensions and \
+                       basename not in existing_c_basenames:
+                        c_source_exclude.append(os.path.basename(file))
+
         # Sym link any c objects into the executable object directory, since
         # these would not have gotten symlinked like all the ada objects
         # above.
@@ -261,6 +281,8 @@ def _build(self, redo_1, redo_2, redo_3):
             + " -XSOURCE_DIRS="
             + source_dir
             + (("," + ",".join(c_source_path)) if c_source_path else "")
+            + " -XEXCLUDED_SOURCE_FILES="
+            + ",".join(c_source_exclude)
             + ((" " + gprbuild_flags.strip()) if gprbuild_flags else "")
             + direct
         )
diff --git a/redo/targets/gpr/a_adamant.gpr b/redo/targets/gpr/a_adamant.gpr
index cc19d2b..6df6773 100644
--- a/redo/targets/gpr/a_adamant.gpr
+++ b/redo/targets/gpr/a_adamant.gpr
@@ -4,6 +4,7 @@ abstract project a_adamant is
    -- Adamant build system and GPRBuild.
    ADAMANT_DIR := external("ADAMANT_DIR", "");
    SOURCE_DIRS := external_as_list("SOURCE_DIRS", ",");
+   EXCLUDED_SOURCE_FILES := external_as_list("EXCLUDED_SOURCE_FILES", ",");
    OBJECT_DIR := external("OBJECT_DIR", "");
    EXEC_DIR := external("EXEC_DIR", "");
    CHECK_STYLE := external("CHECK_STYLE", "False");
diff --git a/redo/targets/gpr/linux_analyze.gpr b/redo/targets/gpr/linux_analyze.gpr
index 01c2b68..c860223 100644
--- a/redo/targets/gpr/linux_analyze.gpr
+++ b/redo/targets/gpr/linux_analyze.gpr
@@ -7,6 +7,7 @@ project linux_analyze extends all "a_linux_debug_base.gpr" is
    -- to GPRBuild.
    -----------------------------------------------
    for Source_Dirs use a_adamant.SOURCE_DIRS;
+   for Excluded_Source_Files use a_adamant.EXCLUDED_SOURCE_FILES;
    for Object_Dir use a_adamant.OBJECT_DIR;
    for Exec_Dir use a_adamant.EXEC_DIR;
 
diff --git a/redo/targets/gpr/linux_coverage.gpr b/redo/targets/gpr/linux_coverage.gpr
index f9b8a07..cf1793e 100644
--- a/redo/targets/gpr/linux_coverage.gpr
+++ b/redo/targets/gpr/linux_coverage.gpr
@@ -10,6 +10,7 @@ project linux_coverage extends all "a_linux_debug_base.gpr" is
    -- to GPRBuild.
    -----------------------------------------------
    for Source_Dirs use a_adamant.SOURCE_DIRS;
+   for Excluded_Source_Files use a_adamant.EXCLUDED_SOURCE_FILES;
    for Object_Dir use a_adamant.OBJECT_DIR;
    for Exec_Dir use a_adamant.EXEC_DIR;
 
diff --git a/redo/targets/gpr/linux_debug.gpr b/redo/targets/gpr/linux_debug.gpr
index 63fd36c..0f5456e 100644
--- a/redo/targets/gpr/linux_debug.gpr
+++ b/redo/targets/gpr/linux_debug.gpr
@@ -7,6 +7,7 @@ project linux_debug extends all "a_linux_debug_base.gpr" is
    -- to GPRBuild.
    -----------------------------------------------
    for Source_Dirs use a_adamant.SOURCE_DIRS;
+   for Excluded_Source_Files use a_adamant.EXCLUDED_SOURCE_FILES;
    for Object_Dir use a_adamant.OBJECT_DIR;
    for Exec_Dir use a_adamant.EXEC_DIR;
 
diff --git a/redo/targets/gpr/linux_test.gpr b/redo/targets/gpr/linux_test.gpr
index eaae25b..96c87c6 100644
--- a/redo/targets/gpr/linux_test.gpr
+++ b/redo/targets/gpr/linux_test.gpr
@@ -10,6 +10,7 @@ project linux_test extends all "a_linux_debug_base.gpr" is
    -- to GPRBuild.
    -----------------------------------------------
    for Source_Dirs use a_adamant.SOURCE_DIRS;
+   for Excluded_Source_Files use a_adamant.EXCLUDED_SOURCE_FILES;
    for Object_Dir use a_adamant.OBJECT_DIR;
    for Exec_Dir use a_adamant.EXEC_DIR;