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export _mh_execute_header with weak linkage

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* also fix extern variables with initialiaztion values to generate runtime code
 * remove the workaround in example/shared_library/mathtest.zig
 * introduce the ability for global variables to have Weak and LinkOnce
   linkage
 * fix `@export` to work for non-functions. this code needs to be
   audited though.
 * fix comptime ptrcast not keeping bigger alignment
 * fix linker warnings when targeting darwin

closes #1903
This commit is contained in:
Andrew Kelley
2019-02-18 16:47:30 -05:00
parent 74a335c4cc
commit 28bf768883
10 changed files with 107 additions and 31 deletions
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9
example/shared_library/mathtest.zig
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@@ -1,12 +1,3 @@
// TODO Remove this workaround
comptime {
const builtin = @import("builtin");
if (builtin.os == builtin.Os.macosx) {
@export("__mh_execute_header", _mh_execute_header, builtin.GlobalLinkage.Weak);
}
}
var _mh_execute_header = extern struct {x: usize}{.x = 0};
export fn add(a: i32, b: i32) i32 {
return a + b;
}