runtime/cgo: ignore -Watomic-alignment in gcc_libinit.c

When cross-compiling a cgo program with CC=clang for Linux/ARMv5, atomic warnings cause build errors, as cgo uses -Werror. These warnings seem to be harmless and come from the usage of __atomic_load_n, which is emulated due to the lack of atomic instructions in armv5. Fixes golang#65290 Change-Id: Ie72efb77468f06888f81f15850401dc8ce2c78f9 GitHub-Last-Rev: fbad847 GitHub-Pull-Request: golang#65588 Reviewed-on: https://go-review.googlesource.com/c/go/+/562348 Auto-Submit: Ian Lance Taylor <[email protected]> LUCI-TryBot-Result: Go LUCI <[email protected]> Reviewed-by: Ian Lance Taylor <[email protected]> Reviewed-by: Dmitri Shuralyov <[email protected]>
macnibblet · Feb 10, 2024 · 4a7f3ac · 4a7f3ac
1 parent bf821f6
commit 4a7f3ac
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/runtime/cgo/gcc_libinit.c b/src/runtime/cgo/gcc_libinit.c
@@ -4,6 +4,12 @@
 
 //go:build unix
 
+// When cross-compiling with clang to linux/armv5, atomics are emulated
+// and cause a compiler warning. This results in a build failure since
+// cgo uses -Werror. See #65290.
+#pragma GCC diagnostic ignored "-Wpragmas"
+#pragma GCC diagnostic ignored "-Watomic-alignment"
+
 #include <pthread.h>
 #include <errno.h>
 #include <stdio.h>