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cmd/cgo: silence unaligned-access 

Clang 14+ introduced a warning when using mixed packed and unpacked structs.
This can cause problems when taking an address of the unpacked struct, which
may end up having a different alignment than expected.

This is not a problem in cgo, which does not take pointers from the packed
struct.

Fixes #62480

Change-Id: If5879eea5e1b77bc6dc7430f68f8c916bff9b090
Reviewed-on: https://go-review.googlesource.com/c/go/+/526915
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Egon Elbre 2023-09-08 11:17:59 +03:00 committed by Gopher Robot
parent 2e7e1d2e8d
commit 2fe2f08542
1 changed files with 2 additions and 0 deletions
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2
src/cmd/cgo/out.go
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@ -910,6 +910,7 @@ func (p *Package) writeExports(fgo2, fm, fgcc, fgcch io.Writer) {
fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Wunknown-pragmas\"\n")
fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Wpragmas\"\n")
fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Waddress-of-packed-member\"\n")
fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Wunaligned-access\"\n")
fmt.Fprintf(fgcc, "extern void crosscall2(void (*fn)(void *), void *, int, size_t);\n")
fmt.Fprintf(fgcc, "extern size_t _cgo_wait_runtime_init_done(void);\n")
@ -1522,6 +1523,7 @@ extern char* _cgo_topofstack(void);
#pragma GCC diagnostic ignored "-Wunknown-pragmas"
#pragma GCC diagnostic ignored "-Wpragmas"
#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
#pragma GCC diagnostic ignored "-Wunaligned-access"
#include <errno.h>
#include <string.h>