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cmd/cgo: ignore unrecognized GCC warning group pragmas
CL 159859 causes build failure with old clang versions (3.4.1) on FreeBSD 10.3/10.4. Update #29962 Update #27619 Change-Id: I78264ac5d8d17eeae89a982e89aac988eb22b286 Reviewed-on: https://go-review.googlesource.com/c/160777 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -777,6 +777,9 @@ func (p *Package) writeExports(fgo2, fm, fgcc, fgcch io.Writer) {
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fmt.Fprintf(fgcc, "#include \"_cgo_export.h\"\n\n")
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// We use packed structs, but they are always aligned.
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// The pragmas and address-of-packed-member are not recognized as warning groups in clang 3.4.1, so ignore unknown pragmas first.
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// remove as part of #27619 (all: drop support for FreeBSD 10).
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fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Wunknown-pragmas\"\n")
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fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Wpragmas\"\n")
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fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Waddress-of-packed-member\"\n")
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@ -1478,6 +1481,10 @@ __cgo_size_assert(double, 8)
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extern char* _cgo_topofstack(void);
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/* We use packed structs, but they are always aligned. */
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/* The pragmas and address-of-packed-member are not recognized as warning groups in clang 3.4.1, so ignore unknown pragmas first. */
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/* remove as part of #27619 (all: drop support for FreeBSD 10). */
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#pragma GCC diagnostic ignored "-Wunknown-pragmas"
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#pragma GCC diagnostic ignored "-Wpragmas"
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#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
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