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These SDL_* return NULL on error, and gcc11/clang won't allow this.
https://bugs.gentoo.org/739086
--- a/client_net.cpp
+++ b/client_net.cpp
@@ -33,3 +33,3 @@
cond = SDL_CreateCond();
- if (cond <0)
+ if (!cond)
{
@@ -39,3 +39,3 @@
mutex = SDL_CreateMutex();
- if (mutex < 0)
+ if (!mutex)
{
@@ -47,3 +47,3 @@
trans_th = SDL_CreateThread (&client_tcpnet::transf_func, (void *) this);
- if (trans_th < 0)
+ if (!trans_th)
{
@@ -53,3 +53,3 @@
input_th = SDL_CreateThread (&client_tcpnet::input_func, (void *) this);
- if (input_th < 0)
+ if (!input_th)
{
--- a/game_server.cpp
+++ b/game_server.cpp
@@ -66,3 +66,3 @@
con_th = SDL_CreateThread (&game_server::connection_accepter, (void *) this);
- if (con_th < 0)
+ if (!con_th)
{
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