zig

commit e445c0d63e788fba46a41c1241e6b312423b7f21 (tree)
parent 81a9bec442caa20dcd1793a4eb06c4fbe59e4d50
Author: Alex Rønne Petersen <alex@alexrp.com>
Date:   Wed,  6 May 2026 20:55:36 +0200

zig cc: always enforce -mabi=ieeelongdouble for powerpc

closes https://codeberg.org/ziglang/zig/issues/30976

Diffstat:
M
src/Compilation.zig
 | 
13
+++++++++++++

1 file changed, 13 insertions(+), 0 deletions(-)
diff --git a/src/Compilation.zig b/src/Compilation.zig
@@ -6639,6 +6639,19 @@ pub fn addCCArgs(
         }
     }
 
+    if (target.cpu.arch.isPowerPC()) {
+        // We do not -- and probably never will -- support the IBM 128-bit `long double` format.
+        // LLVM and Clang also do not have complete support for it, producing wrong values in some
+        // cases. So just enforce IEEE `long double` everywhere - either binary64 or binary128
+        // depending on what the OS/ABI requires.
+        try argv.appendSlice(&.{
+            "-mabi=ieeelongdouble",
+            // Clang has some truly goofy logic for emitting warnings about the
+            // "current library" not supporting IEEE `long double`.
+            "-Wno-unsupported-abi",
+        });
+    }
+
     // We might want to support -mfloat-abi=softfp for Arm and CSKY here in the future.
     if (target_util.clangSupportsFloatAbiArg(target)) {
         const fabi = @tagName(target.abi.float());