tcc -fgnu89-inline -fno-asynchronous-unwind-tables

-fgnu89-inline: 'extern inline' like 'static inline'
-fno-asynchronous-unwind-tables: don't emit eh_frames

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       run: ./configure && make && make test -k
 
   test-x86_64-osx:
-    runs-on: macos-12
+    runs-on: macos-13
     timeout-minutes: 2
     steps:
     - uses: actions/checkout@v4

libtcc.c

@@ -822,6 +822,7 @@ LIBTCCAPI TCCState *tcc_new(void)
     s->warn_implicit_function_declaration = 1;
     s->warn_discarded_qualifiers = 1;
     s->ms_extensions = 1;
+    s->unwind_tables = 1;
 
 #ifdef CHAR_IS_UNSIGNED
     s->char_is_unsigned = 1;
@@ -1674,6 +1675,8 @@ static const FlagDef options_f[] = {
     { offsetof(TCCState, dollars_in_identifiers), 0, "dollars-in-identifiers" },
     { offsetof(TCCState, test_coverage), 0, "test-coverage" },
     { offsetof(TCCState, reverse_funcargs), 0, "reverse-funcargs" },
+    { offsetof(TCCState, gnu89_inline), 0, "gnu89-inline" },
+    { offsetof(TCCState, unwind_tables), 0, "asynchronous-unwind-tables" },
     { 0, 0, NULL }
 };
 

tcc.c

@@ -116,6 +116,8 @@ static const char help2[] =
     "  ms-extensions                 allow anonymous struct in struct\n"
     "  dollars-in-identifiers        allow '$' in C symbols\n"
     "  reverse-funcargs              evaluate function arguments right to left\n"
+    "  gnu89-inline                  'extern inline' is like 'static inline'\n"
+    "  asynchronous-unwind-tables    create eh_frame section [on]\n"
     "  test-coverage                 create code coverage code\n"
     "-m... target specific options:\n"
     "  ms-bitfields                  use MSVC bitfield layout\n"

tcc.h

@@ -777,6 +777,8 @@ struct TCCState {
     unsigned char dollars_in_identifiers;  /* allows '$' char in identifiers */
     unsigned char ms_bitfields; /* if true, emulate MS algorithm for aligning bitfields */
     unsigned char reverse_funcargs; /* if true, evaluate last function arg first */
+    unsigned char gnu89_inline; /* treat 'extern inline' like 'static inline' */
+    unsigned char unwind_tables; /* create eh_frame section */
 
     /* warning switches */
     unsigned char warn_none;

tccdbg.c

@@ -716,6 +716,8 @@ ST_FUNC void tcc_eh_frame_start(TCCState *s1)
 {
 #if !(defined _WIN32 || defined __APPLE__ || defined TCC_TARGET_ARM || \
       defined TARGETOS_BSD)
+    if (!s1->unwind_tables)
+        return;
     eh_frame_section = new_section(s1, ".eh_frame", SHT_PROGBITS, SHF_ALLOC);
 
     s1->eh_start = eh_frame_section->data_offset;

tccgen.c

@@ -8459,6 +8459,7 @@ static int decl(int l)
     CType type, btype;
     Sym *sym;
     AttributeDef ad, adbase;
+    ElfSym *esym;
 
     while (1) {
 
@@ -8529,21 +8530,17 @@ static int decl(int l)
                     func_vt = type;
                     decl(VT_CMP);
                 }
-#if defined TCC_TARGET_MACHO || defined TARGETOS_ANDROID
-                if (sym->f.func_alwinl
-                    && ((type.t & (VT_EXTERN | VT_INLINE))
-                        == (VT_EXTERN | VT_INLINE))) {
+
+                if ((type.t & (VT_EXTERN|VT_INLINE)) == (VT_EXTERN|VT_INLINE)) {
                     /* always_inline functions must be handled as if they
                        don't generate multiple global defs, even if extern
                        inline, i.e. GNU inline semantics for those.  Rewrite
                        them into static inline.  */
-                    type.t &= ~VT_EXTERN;
-                    type.t |= VT_STATIC;
+                    if (tcc_state->gnu89_inline || sym->f.func_alwinl)
+                        type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
+                    else
+                        type.t &= ~VT_INLINE; /* always compile otherwise */
                 }
-#endif
-                /* always compile 'extern inline' */
-                if (type.t & VT_EXTERN)
-                    type.t &= ~VT_INLINE;
 
             } else if (oldint) {
                 tcc_warning("type defaults to int");
@@ -8682,7 +8679,7 @@ static int decl(int l)
                         ) {
                         /* external variable or function */
                         type.t |= VT_EXTERN;
-                        sym = external_sym(v, &type, r, &ad);
+                        external_sym(v, &type, r, &ad);
                     } else {
                         if (l == VT_CONST || (type.t & VT_STATIC))
                             r |= VT_CONST;
@@ -8702,8 +8699,7 @@ static int decl(int l)
                            We only support the case where the base is already
                            defined, otherwise we would need deferring to emit
                            the aliases until the end of the compile unit.  */
-                        Sym *alias_target = sym_find(ad.alias_target);
-                        ElfSym *esym = elfsym(alias_target);
+                        esym = elfsym(sym_find(ad.alias_target));
                         if (!esym)
                             tcc_error("unsupported forward __alias__ attribute");
                         put_extern_sym2(sym_find(v), esym->st_shndx,