crossbuild: target-aware POSIX gate in generated headers (Sylpheed fork)

Pre-generated snappy-stubs-public.h / config.h baked HAVE_SYS_UIO_H=1 from
a Linux cmake host, breaking clang-cl cross-compiles to Windows. Gate the
sys/uio.h include on !_WIN32 so the same checked-in headers build on both
hosts. See xenia-rs docs/CROSS_BUILD_SETUP.md §7.3.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

config.h

@@ -0,0 +1,69 @@
+#ifndef THIRD_PARTY_SNAPPY_OPENSOURCE_CMAKE_CONFIG_H_
+#define THIRD_PARTY_SNAPPY_OPENSOURCE_CMAKE_CONFIG_H_
+
+/* Define to 1 if the compiler supports __attribute__((always_inline)). */
+#define HAVE_ATTRIBUTE_ALWAYS_INLINE 1
+
+/* Define to 1 if the compiler supports __builtin_ctz and friends. */
+#define HAVE_BUILTIN_CTZ 1
+
+/* Define to 1 if the compiler supports __builtin_expect. */
+#define HAVE_BUILTIN_EXPECT 1
+
+/* Define to 1 if the compiler supports __builtin_prefetch. */
+#define HAVE_BUILTIN_PREFETCH 1
+
+/* Define to 1 if you have a definition for mmap() in <sys/mman.h>. */
+#define HAVE_FUNC_MMAP 1
+
+/* Define to 1 if you have a definition for sysconf() in <unistd.h>. */
+#define HAVE_FUNC_SYSCONF 1
+
+/* Define to 1 if you have the `lzo2' library (-llzo2). */
+#define HAVE_LIBLZO2 0
+
+/* Define to 1 if you have the `z' library (-lz). */
+#define HAVE_LIBZ 1
+
+/* Define to 1 if you have the `lz4' library (-llz4). */
+#define HAVE_LIBLZ4 0
+
+/* Define to 1 if you have the <sys/mman.h> header file. */
+#define HAVE_SYS_MMAN_H 1
+
+/* Define to 1 if you have the <sys/resource.h> header file. */
+#define HAVE_SYS_RESOURCE_H 1
+
+/* Define to 1 if you have the <sys/time.h> header file. */
+#define HAVE_SYS_TIME_H 1
+
+/* Define to 1 if you have the <sys/uio.h> header file. */
+#define HAVE_SYS_UIO_H 1
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#define HAVE_UNISTD_H 1
+
+/* Define to 1 if you have the <windows.h> header file. */
+#define HAVE_WINDOWS_H 0
+
+/* Define to 1 if you target processors with SSSE3+ and have <tmmintrin.h>. */
+#define SNAPPY_HAVE_SSSE3 1
+
+/* Define to 1 if you target processors with SSE4.2 and have <crc32intrin.h>. */
+#define SNAPPY_HAVE_X86_CRC32 1
+
+/* Define to 1 if you target processors with BMI2+ and have <bmi2intrin.h>. */
+#define SNAPPY_HAVE_BMI2 0
+
+/* Define to 1 if you target processors with NEON and have <arm_neon.h>. */
+#define SNAPPY_HAVE_NEON 0
+
+/* Define to 1 if you have <arm_neon.h> and <arm_acle.h> and want to optimize
+   compression speed by using __crc32cw from <arm_acle.h>. */
+#define SNAPPY_HAVE_NEON_CRC32 0
+
+/* Define to 1 if your processor stores words with the most significant byte
+   first (like Motorola and SPARC, unlike Intel and VAX). */
+#define SNAPPY_IS_BIG_ENDIAN 0
+
+#endif  // THIRD_PARTY_SNAPPY_OPENSOURCE_CMAKE_CONFIG_H_

snappy-stubs-public.h

@@ -0,0 +1,66 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Various type stubs for the open-source version of Snappy.
+//
+// This file cannot include config.h, as it is included from snappy.h,
+// which is a public header. Instead, snappy-stubs-public.h is generated by
+// from snappy-stubs-public.h.in at configure time.
+
+#ifndef THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_
+#define THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_
+
+#include <cstddef>
+
+// Original cmake configure baked HAVE_SYS_UIO_H=1 on the Linux host that
+// pre-generated this header; gate it on _WIN32 so cross-compiles to Windows
+// fall back to the iovec definition below.
+#if !defined(_WIN32)  // HAVE_SYS_UIO_H
+#include <sys/uio.h>
+#endif  // HAVE_SYS_UIO_H
+
+#define SNAPPY_MAJOR 1
+#define SNAPPY_MINOR 2
+#define SNAPPY_PATCHLEVEL 2
+#define SNAPPY_VERSION \
+    ((SNAPPY_MAJOR << 16) | (SNAPPY_MINOR << 8) | SNAPPY_PATCHLEVEL)
+
+namespace snappy {
+
+#if defined(_WIN32)  // !HAVE_SYS_UIO_H
+// Windows does not have an iovec type, yet the concept is universally useful.
+// It is simple to define it ourselves, so we put it inside our own namespace.
+struct iovec {
+  void* iov_base;
+  size_t iov_len;
+};
+#endif  // !HAVE_SYS_UIO_H
+
+}  // namespace snappy
+
+#endif  // THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_