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Date: Thu, 25 Jan 2024 13:09:54 +0100
From: Jules Maselbas <>
Cc: Jules Maselbas <>
Subject: [PATCH] prevent from redefining __STDC_UTF_{16,32}__ macros

I encountered this "issue" trying to compile a program with the -isystem
option to override toolchain/installed musl headers with one from source.

 include/stdc-predef.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/stdc-predef.h b/include/stdc-predef.h
index af1a2799..642bad2d 100644
--- a/include/stdc-predef.h
+++ b/include/stdc-predef.h
@@ -7,7 +7,12 @@
 #define __STDC_IEC_559__ 1
+#if !defined(__STDC_UTF_16__)
 #define __STDC_UTF_16__ 1
+#if !defined(__STDC_UTF_32__)
 #define __STDC_UTF_32__ 1

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