Differences

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--- wswan:bugs [2024/02/17 09:53] – asie
+++ wswan:bugs [2025/11/08 09:38] (current) – asie
@@ Line 1: / Line 1: @@
-====== Known bugs ======
+====== Known issues ======
 ===== gcc-ia16 =====
-In general, gcc-ia16's handling of far pointers is considered experimental. In a wswan target context, this means all accesses outside of the console's internal RAM. Caveat emptor.
+  * In general, if you run into a compiler error or miscompilation, try annotating the function with ''%%__attribute__((noinline, optimize("-O0"))) %%'' as a workaround.
+  * gcc-ia16's handling of far pointers is considered experimental. Caveat emptor.
+  * gcc-ia16's handling of DS != SS (wwitch target) is pretty buggy. It works for simple code, but complex pointer operations may lead to bugs. Again, caveat emptor.
+  * The optimization levels ''%%-O0%%'', ''%%-O2%%'' and ''%%-Os%%'' are most stable (roughly in that order).
-==== Miscompilations involving far function pointers ====
+==== Bug: Miscompilations involving far function pointers ====
 In some cases, when calling pointers from arrays of far function pointers in optimization modes >= -O1, the code will be miscompiled. This is a [[https://github.com/tkchia/gcc-ia16/issues/120|known issue]], with no ETA for a fix.
-One can work around this by annotating the affected function to be compiled without optimizations:
+One can work around this by annotating the affected function to be compiled without optimizations. In particular, one can create a separate function that //only// acts as a wrapper for the function call:
 <code C>
-__attribute__((optimize("-O0"))) // https://github.com/tkchia/gcc-ia16/issues/120
+__attribute__((noinline, optimize("-O0"))) // https://github.com/tkchia/gcc-ia16/issues/120
 void call_to_my_function_table(uint8_t index) {
     my_function_table[index]();
 }
 </code>
+==== Issue: wwitch target and interrupt handlers ====
+The wwitch target does not support relocation; as such, far functions (which interrupt handlers have to be) cannot be created in sections other than the default text section. This can be most easily achieved by building with ''-fno-function-sections'' in CFLAGS.