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compiler_rt: strong linkage when compiling to .c

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This works around a problem that started happening with LLD around
version 18.1.8:

```
lld-link: error: duplicate symbol: .weak.__nexf2.default
>>> defined at CMakeFiles/zig2.dir/compiler_rt.c.obj
>>> defined at compiler_rt.lib(compiler_rt.lib.obj)
```
This commit is contained in:
Andrew Kelley 2024-09-19 12:54:56 -07:00
parent 38af1b7ed1
commit cefcf39faa
1 changed files with 8 additions and 2 deletions
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10
lib/compiler_rt/common.zig
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@ -1,8 +1,14 @@
const std = @import("std");
const builtin = @import("builtin");
const native_endian = builtin.cpu.arch.endian();
const ofmt_c = builtin.object_format == .c;
pub const linkage: std.builtin.GlobalLinkage = if (builtin.is_test) .internal else .weak;
pub const linkage: std.builtin.GlobalLinkage = if (builtin.is_test)
.internal
else if (ofmt_c)
.strong
else
.weak;
/// Determines the symbol's visibility to other objects.
/// For WebAssembly this allows the symbol to be resolved to other modules, but will not
/// export it to the host runtime.
@ -28,7 +34,7 @@ pub const want_float_exceptions = !builtin.cpu.arch.isWasm();
// Libcalls that involve u128 on Windows x86-64 are expected by LLVM to use the
// calling convention of @Vector(2, u64), rather than what's standard.
pub const want_windows_v2u64_abi = builtin.os.tag == .windows and builtin.cpu.arch == .x86_64 and @import("builtin").object_format != .c;
pub const want_windows_v2u64_abi = builtin.os.tag == .windows and builtin.cpu.arch == .x86_64 and !ofmt_c;
/// This governs whether to use these symbol names for f16/f32 conversions
/// rather than the standard names: