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m68k macos: fix --gc-sections

The reason was computed goto labels. Because those end up in data
section but have to reference text section (duh) it got Elf2Mac
pretty confused. Workaround by forcing the computed goto jump table
into a text section. Apparently that helps.

--- a/cross/m68-apple.txt

+++ b/cross/m68-apple.txt

@@ -5,8 +5,8 @@

 cpuflags = ['-march=68020', '-mtune=68020-40']

 [built-in options]

-c_args = cpuflags + ['-fdata-sections', '-ffunction-sections', '-D__macos__']

-c_link_args = cpuflags + ['-Wl,--mac-single', '-Wl,--mac-strip-macsbug']

+c_args = cpuflags + ['-fdata-sections', '-ffunction-sections', '-D__macos__', '-DNDEBUG']

+c_link_args = cpuflags + ['-Wl,--gc-sections,--mac-strip-macsbug']

 cpp_args = c_args

 cpp_link_args = c_link_args

--- a/cross/powerpc-apple.txt

+++ b/cross/powerpc-apple.txt

@@ -4,7 +4,7 @@

 prefix = path + 'powerpc-apple-macos-'

 [built-in options]

-c_args = ['-fdata-sections', '-ffunction-sections', '-D__macos__']

+c_args = ['-fdata-sections', '-ffunction-sections', '-D__macos__', '-DNDEBUG']

 cpp_link_args = ['-Wl,-gc-sections']

 [properties]

--- a/flisp.c

+++ b/flisp.c

@@ -912,7 +912,15 @@

 #if defined(COMPUTED_GOTO)

 #pragma GCC diagnostic push

 #pragma GCC diagnostic ignored "-Wpedantic"

-	static const void *ops[] = {

+#if defined(__macos__) && defined(__m68k__)

+	/*

+	 * Why the specific section? Because Elf2Mac is not happy otherwise,

+	 * Trying to deal with data referencing text section.

+	 * This solves the problem once and for all.

+	 */

+	__attribute__((section(".text.vm.ops")))

+#endif

+	static const void * const ops[] = {

 #define GOTO_OP_OFFSET(op) [op] = &&op_##op

 #include "vm_goto.inc"

 #undef GOTO_OP_OFFSET