ci: add GCC Release testing (#22274)

ci: add GCC release testing

We currently have no release testing, so it's good to check for any
unwanted behavior on release builds as well. Prefer GCC over clang, as
GCC release builds seem to create more warnings on release compared to
debug.

2 files changed, 11 insertions, 4 deletions

diff --git a/src/nvim/CMakeLists.txt b/src/nvim/CMakeLists.txt
index a193af6d51..d6a53456d7 100755
--- a/src/nvim/CMakeLists.txt
+++ b/src/nvim/CMakeLists.txt
@@ -92,6 +92,13 @@ else()
     -Wmissing-noreturn
     -Wmissing-format-attribute
     -Wmissing-prototypes)
+
+  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
+    target_compile_options(main_lib INTERFACE
+      $<$<CONFIG:Release>:-Wno-unused-result>
+      $<$<CONFIG:RelWithDebInfo>:-Wno-unused-result>
+      $<$<CONFIG:MinSizeRel>:-Wno-unused-result>)
+  endif()
 endif()
 
 # On FreeBSD 64 math.h uses unguarded C11 extension, which taints clang
diff --git a/src/nvim/marktree.c b/src/nvim/marktree.c
index 77ba6e6fa4..cb981bb00c 100644
--- a/src/nvim/marktree.c
+++ b/src/nvim/marktree.c
@@ -1135,7 +1135,7 @@ void marktree_check(MarkTree *b)
 
   mtpos_t dummy;
   bool last_right = false;
-  size_t nkeys = check_node(b, b->root, &dummy, &last_right);
+  size_t nkeys = marktree_check_node(b, b->root, &dummy, &last_right);
   assert(b->n_keys == nkeys);
   assert(b->n_keys == map_size(b->id2node));
 #else
@@ -1145,7 +1145,7 @@ void marktree_check(MarkTree *b)
 }
 
 #ifndef NDEBUG
-static size_t check_node(MarkTree *b, mtnode_t *x, mtpos_t *last, bool *last_right)
+size_t marktree_check_node(MarkTree *b, mtnode_t *x, mtpos_t *last, bool *last_right)
 {
   assert(x->n <= 2 * T - 1);
   // TODO(bfredl): too strict if checking "in repair" post-delete tree.
@@ -1154,7 +1154,7 @@ static size_t check_node(MarkTree *b, mtnode_t *x, mtpos_t *last, bool *last_rig
 
   for (int i = 0; i < x->n; i++) {
     if (x->level) {
-      n_keys += check_node(b, x->ptr[i], last, last_right);
+      n_keys += marktree_check_node(b, x->ptr[i], last, last_right);
     } else {
       *last = (mtpos_t) { 0, 0 };
     }
@@ -1171,7 +1171,7 @@ static size_t check_node(MarkTree *b, mtnode_t *x, mtpos_t *last, bool *last_rig
   }
 
   if (x->level) {
-    n_keys += check_node(b, x->ptr[x->n], last, last_right);
+    n_keys += marktree_check_node(b, x->ptr[x->n], last, last_right);
     unrelative(x->key[x->n - 1].pos, last);
 
     for (int i = 0; i < x->n + 1; i++) {