From d999c19a9febfd8efd487fa8dd0c2cc54a3f0d4f Mon Sep 17 00:00:00 2001
From: meh <meh@schizofreni.co>
Date: Sat, 20 Jun 2015 19:13:59 +0200
Subject: [PATCH] crate: improve link attributes and allow static linking

---
 sys/Cargo.toml                   | 1 +
 sys/src/avcodec/codec.rs         | 1 -
 sys/src/avcodec/dv_profile.rs    | 1 -
 sys/src/avcodec/fft.rs           | 1 -
 sys/src/avcodec/mod.rs           | 4 ++++
 sys/src/avcodec/qsv.rs           | 1 -
 sys/src/avcodec/vda.rs           | 1 -
 sys/src/avcodec/vobis_parser.rs  | 1 -
 sys/src/avdevice/device.rs       | 1 -
 sys/src/avdevice/mod.rs          | 4 ++++
 sys/src/avfilter/buffersink.rs   | 1 -
 sys/src/avfilter/buffersrc.rs    | 1 -
 sys/src/avfilter/filter.rs       | 1 -
 sys/src/avfilter/mod.rs          | 4 ++++
 sys/src/avformat/format.rs       | 1 -
 sys/src/avformat/io.rs           | 1 -
 sys/src/avformat/mod.rs          | 4 ++++
 sys/src/avresample/mod.rs        | 4 ++++
 sys/src/avresample/resample.rs   | 1 -
 sys/src/avutil/adler32.rs        | 1 -
 sys/src/avutil/aes.rs            | 1 -
 sys/src/avutil/audio_fifo.rs     | 1 -
 sys/src/avutil/base64.rs         | 1 -
 sys/src/avutil/blowfish.rs       | 1 -
 sys/src/avutil/bprint.rs         | 1 -
 sys/src/avutil/buffer.rs         | 1 -
 sys/src/avutil/camellia.rs       | 1 -
 sys/src/avutil/cast5.rs          | 1 -
 sys/src/avutil/channel_layout.rs | 1 -
 sys/src/avutil/cpu.rs            | 1 -
 sys/src/avutil/crc.rs            | 1 -
 sys/src/avutil/dict.rs           | 1 -
 sys/src/avutil/display.rs        | 1 -
 sys/src/avutil/downmix_info.rs   | 1 -
 sys/src/avutil/error.rs          | 1 -
 sys/src/avutil/eval.rs           | 1 -
 sys/src/avutil/fifo.rs           | 1 -
 sys/src/avutil/file.rs           | 1 -
 sys/src/avutil/frame.rs          | 1 -
 sys/src/avutil/hash.rs           | 1 -
 sys/src/avutil/hmac.rs           | 1 -
 sys/src/avutil/imgutils.rs       | 1 -
 sys/src/avutil/lfg.rs            | 1 -
 sys/src/avutil/log.rs            | 1 -
 sys/src/avutil/lzo.rs            | 1 -
 sys/src/avutil/mathematics.rs    | 1 -
 sys/src/avutil/md5.rs            | 1 -
 sys/src/avutil/mem.rs            | 1 -
 sys/src/avutil/mod.rs            | 4 ++++
 sys/src/avutil/murmur3.rs        | 1 -
 sys/src/avutil/opt.rs            | 1 -
 sys/src/avutil/parseutils.rs     | 1 -
 sys/src/avutil/pixdesc.rs        | 1 -
 sys/src/avutil/random_seed.rs    | 1 -
 sys/src/avutil/rational.rs       | 1 -
 sys/src/avutil/ripemd.rs         | 1 -
 sys/src/avutil/samplefmt.rs      | 1 -
 sys/src/avutil/sha.rs            | 1 -
 sys/src/avutil/sha512.rs         | 1 -
 sys/src/avutil/stereo3d.rs       | 1 -
 sys/src/avutil/string.rs         | 1 -
 sys/src/avutil/threadmessage.rs  | 1 -
 sys/src/avutil/time.rs           | 1 -
 sys/src/avutil/timecode.rs       | 1 -
 sys/src/avutil/twofish.rs        | 1 -
 sys/src/avutil/util.rs           | 1 -
 sys/src/avutil/xtea.rs           | 1 -
 sys/src/postproc/mod.rs          | 4 ++++
 sys/src/postproc/postproc.rs     | 1 -
 sys/src/swresample/mod.rs        | 4 ++++
 sys/src/swresample/resample.rs   | 1 -
 sys/src/swscale/mod.rs           | 4 ++++
 sys/src/swscale/scale.rs         | 1 -
 73 files changed, 37 insertions(+), 63 deletions(-)

diff --git a/sys/Cargo.toml b/sys/Cargo.toml
index 0a921ed..5ba528a 100644
--- a/sys/Cargo.toml
+++ b/sys/Cargo.toml
@@ -15,6 +15,7 @@ libc = "*"
 [features]
 default  = ["avcodec", "avdevice", "avfilter", "avformat", "avresample", "postproc", "swresample", "swscale"]
 
+static     = []
 avcodec    = []
 avdevice   = ["avformat"]
 avfilter   = []
diff --git a/sys/src/avcodec/codec.rs b/sys/src/avcodec/codec.rs
index 8bcaffe..35438d9 100644
--- a/sys/src/avcodec/codec.rs
+++ b/sys/src/avcodec/codec.rs
@@ -1315,7 +1315,6 @@ pub enum AVLockOp {
 	AV_LOCK_DESTROY,
 }
 
-#[link(name = "avcodec")]
 extern {
 	pub fn av_codec_get_pkt_timebase(avctx: *const AVCodecContext) -> AVRational;
 	pub fn av_codec_set_pkt_timebase(avctx: *mut AVCodecContext, val: AVRational);
diff --git a/sys/src/avcodec/dv_profile.rs b/sys/src/avcodec/dv_profile.rs
index 14d90ba..088ada7 100644
--- a/sys/src/avcodec/dv_profile.rs
+++ b/sys/src/avcodec/dv_profile.rs
@@ -25,7 +25,6 @@ pub struct AVDVProfile {
 	pub audio_shuffle: [*const uint8_t; 9],
 }
 
-#[link(name = "avcodec")]
 extern {
 	pub fn av_dv_frame_profile(sys: *const AVDVProfile, frame: *const uint8_t, buf_size: c_uint) -> *const AVDVProfile;
 	pub fn av_dv_codec_profile(width: c_int, height: c_int, pix_fmt: AVPixelFormat) -> *const AVDVProfile;
diff --git a/sys/src/avcodec/fft.rs b/sys/src/avcodec/fft.rs
index f9149f7..5c18fcd 100644
--- a/sys/src/avcodec/fft.rs
+++ b/sys/src/avcodec/fft.rs
@@ -33,7 +33,6 @@ pub enum DCTTransformType {
 
 pub type DCTContext = c_void;
 
-#[link(name = "avcodec")]
 extern {
 	pub fn av_fft_init(nbits: c_int, inverse: c_int) -> *mut FFTContext;
 	pub fn av_fft_permute(s: *mut FFTContext, z: *mut FFTComplex);
diff --git a/sys/src/avcodec/mod.rs b/sys/src/avcodec/mod.rs
index 94e2a2c..dbef20b 100644
--- a/sys/src/avcodec/mod.rs
+++ b/sys/src/avcodec/mod.rs
@@ -35,3 +35,7 @@ pub use self::vobis_parser::*;
 
 mod xvmc;
 pub use self::xvmc::*;
+
+#[cfg_attr(feature = "static", link(name = "avcodec", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "avcodec"))]
+extern { }
diff --git a/sys/src/avcodec/qsv.rs b/sys/src/avcodec/qsv.rs
index 7e9d701..e2660f0 100644
--- a/sys/src/avcodec/qsv.rs
+++ b/sys/src/avcodec/qsv.rs
@@ -9,7 +9,6 @@ pub struct AVQSVContext {
 	pub nb_ext_buffers: c_int,
 }
 
-#[link(name = "avcodec")]
 extern {
 	pub fn av_qsv_alloc_context() -> *mut AVQSVContext;
 }
diff --git a/sys/src/avcodec/vda.rs b/sys/src/avcodec/vda.rs
index 449b5fa..fd7c09e 100644
--- a/sys/src/avcodec/vda.rs
+++ b/sys/src/avcodec/vda.rs
@@ -23,7 +23,6 @@ pub struct AVVDAContext {
 	pub output_callback: extern fn(*mut c_void, *mut c_void, i32, uint32_t, *mut c_void),
 }
 
-#[link(name = "avcodec")]
 extern {
 	pub fn ff_vda_create_decoder(vda_ctx: *mut vda_context, extradata: *mut uint8_t, extradata_size: c_int) -> c_int;
 	pub fn ff_vda_destroy_decoder(vda_ctx: *mut vda_context) -> c_int;
diff --git a/sys/src/avcodec/vobis_parser.rs b/sys/src/avcodec/vobis_parser.rs
index a4587a5..816798c 100644
--- a/sys/src/avcodec/vobis_parser.rs
+++ b/sys/src/avcodec/vobis_parser.rs
@@ -6,7 +6,6 @@ pub const VORBIS_FLAG_HEADER:  c_int = 0x00000001;
 pub const VORBIS_FLAG_COMMENT: c_int = 0x00000002;
 pub const VORBIS_FLAG_SETUP:   c_int = 0x00000004;
 
-#[link(name = "avcodec")]
 extern {
 	pub fn av_vorbis_parse_init(extradata: *const uint8_t, extradata_size: c_int) -> *mut AVVorbisParseContext;
 	pub fn av_vorbis_parse_free(s: *mut *mut AVVorbisParseContext);
diff --git a/sys/src/avdevice/device.rs b/sys/src/avdevice/device.rs
index aef4ed4..3f362f5 100644
--- a/sys/src/avdevice/device.rs
+++ b/sys/src/avdevice/device.rs
@@ -78,7 +78,6 @@ pub struct AVDeviceInfoList {
 	pub default_device: c_int,
 }
 
-#[link(name = "avdevice")]
 extern {
 	pub static av_device_capabilities: *const AVOption;
 
diff --git a/sys/src/avdevice/mod.rs b/sys/src/avdevice/mod.rs
index 3002ec7..f30eace 100644
--- a/sys/src/avdevice/mod.rs
+++ b/sys/src/avdevice/mod.rs
@@ -1,2 +1,6 @@
 mod device;
 pub use self::device::*;
+
+#[cfg_attr(feature = "static", link(name = "avdevice", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "avdevice"))]
+extern { }
diff --git a/sys/src/avfilter/buffersink.rs b/sys/src/avfilter/buffersink.rs
index 034685b..7350c1e 100644
--- a/sys/src/avfilter/buffersink.rs
+++ b/sys/src/avfilter/buffersink.rs
@@ -19,7 +19,6 @@ pub struct AVABufferSinkParams {
 	pub sample_rates: *mut c_int,
 }
 
-#[link(name = "avfilter")]
 extern {
 	pub fn av_buffersink_get_frame_flags(ctx: *mut AVFilterContext, frame: *mut AVFrame, flags: c_int) -> c_int;
 
diff --git a/sys/src/avfilter/buffersrc.rs b/sys/src/avfilter/buffersrc.rs
index 3020c5f..bd6a22c 100644
--- a/sys/src/avfilter/buffersrc.rs
+++ b/sys/src/avfilter/buffersrc.rs
@@ -7,7 +7,6 @@ pub const AV_BUFFERSRC_FLAG_NO_COPY:         c_int = 2;
 pub const AV_BUFFERSRC_FLAG_PUSH:            c_int = 4;
 pub const AV_BUFFERSRC_FLAG_KEEP_REF:        c_int = 8;
 
-#[link(name = "avfilter")]
 extern {
 	pub fn av_buffersrc_add_ref(buffer_src: *mut AVFilterContext, picref: *mut AVFilterBufferRef, flags: c_int) -> c_int;
 	pub fn av_buffersrc_get_nb_failed_requests(buffer_src: *mut AVFilterContext) -> c_uint;
diff --git a/sys/src/avfilter/filter.rs b/sys/src/avfilter/filter.rs
index 9901b4d..f44bd94 100644
--- a/sys/src/avfilter/filter.rs
+++ b/sys/src/avfilter/filter.rs
@@ -219,7 +219,6 @@ pub struct AVFilterInOut {
 	pub next: *mut AVFilterInOut,
 }
 
-#[link(name = "avfilter")]
 extern {
 	pub fn avfilter_version() -> c_uint;
 	pub fn avfilter_configuration() -> *const c_char;
diff --git a/sys/src/avfilter/mod.rs b/sys/src/avfilter/mod.rs
index d65160f..72864bf 100644
--- a/sys/src/avfilter/mod.rs
+++ b/sys/src/avfilter/mod.rs
@@ -6,3 +6,7 @@ pub use self::buffersink::*;
 
 mod buffersrc;
 pub use self::buffersrc::*;
+
+#[cfg_attr(feature = "static", link(name = "avfilter", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "avfilter"))]
+extern { }
diff --git a/sys/src/avformat/format.rs b/sys/src/avformat/format.rs
index aeb0b50..2190745 100644
--- a/sys/src/avformat/format.rs
+++ b/sys/src/avformat/format.rs
@@ -433,7 +433,6 @@ pub const AVSEEK_FLAG_BYTE:     c_int = 2;
 pub const AVSEEK_FLAG_ANY:      c_int = 4;
 pub const AVSEEK_FLAG_FRAME:    c_int = 8;
 
-#[link(name = "avformat")]
 extern {
 	pub fn av_get_packet(s: *mut AVIOContext, pkt: *mut AVPacket, size: c_int) -> c_int;
 	pub fn av_append_packet(s: *mut AVIOContext, pkt: *mut AVPacket, size: c_int) -> c_int;
diff --git a/sys/src/avformat/io.rs b/sys/src/avformat/io.rs
index 3bb6ac6..54fa8b6 100644
--- a/sys/src/avformat/io.rs
+++ b/sys/src/avformat/io.rs
@@ -93,7 +93,6 @@ pub unsafe fn avio_tell(s: *mut AVIOContext) -> int64_t {
 	avio_seek(s, 0, SEEK_CUR)
 }
 
-#[link(name = "avformat")]
 extern {
 	pub fn avio_find_protocol_name(url: *const c_char) -> *const c_char;
 	pub fn avio_check(url: *const c_char, flags: c_int) -> c_int;
diff --git a/sys/src/avformat/mod.rs b/sys/src/avformat/mod.rs
index d8d815e..5a5c922 100644
--- a/sys/src/avformat/mod.rs
+++ b/sys/src/avformat/mod.rs
@@ -3,3 +3,7 @@ pub use self::format::*;
 
 mod io;
 pub use self::io::*;
+
+#[cfg_attr(feature = "static", link(name = "avformat", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "avformat"))]
+extern { }
diff --git a/sys/src/avresample/mod.rs b/sys/src/avresample/mod.rs
index b74e900..33e5dd8 100644
--- a/sys/src/avresample/mod.rs
+++ b/sys/src/avresample/mod.rs
@@ -3,3 +3,7 @@ pub use self::resample::*;
 pub use self::resample::AVMixCoeffType::*;
 pub use self::resample::AVResampleFilterType::*;
 pub use self::resample::AVResampleDitherMethod::*;
+
+#[cfg_attr(feature = "static", link(name = "avresample", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "avresample"))]
+extern { }
diff --git a/sys/src/avresample/resample.rs b/sys/src/avresample/resample.rs
index 02ac90e..4607698 100644
--- a/sys/src/avresample/resample.rs
+++ b/sys/src/avresample/resample.rs
@@ -33,7 +33,6 @@ pub enum AVResampleDitherMethod {
 	AV_RESAMPLE_DITHER_NB,
 }
 
-#[link(name = "avresample")]
 extern {
 	pub fn avresample_version() -> c_uint;
 	pub fn avresample_configuration() -> *const c_char;
diff --git a/sys/src/avutil/adler32.rs b/sys/src/avutil/adler32.rs
index 759826f..5cecdab 100644
--- a/sys/src/avutil/adler32.rs
+++ b/sys/src/avutil/adler32.rs
@@ -1,6 +1,5 @@
 use libc::{c_int, c_ulong, uint8_t};
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_adler32_update(adler: c_ulong, buf: *const uint8_t, len: c_int) -> c_ulong;
 }
diff --git a/sys/src/avutil/aes.rs b/sys/src/avutil/aes.rs
index 6db2282..9628ab6 100644
--- a/sys/src/avutil/aes.rs
+++ b/sys/src/avutil/aes.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, uint8_t};
 
 pub type AVAES = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub static av_aes_size: c_int;
 
diff --git a/sys/src/avutil/audio_fifo.rs b/sys/src/avutil/audio_fifo.rs
index b5d5b78..c6fe5c9 100644
--- a/sys/src/avutil/audio_fifo.rs
+++ b/sys/src/avutil/audio_fifo.rs
@@ -3,7 +3,6 @@ use super::samplefmt::AVSampleFormat;
 
 pub type AVAudioFifo = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_audio_fifo_free(af: *mut AVAudioFifo);
 	pub fn av_audio_fifo_alloc(sample_fmt: AVSampleFormat, channels: c_int, nb_samples: c_int) -> *mut AVAudioFifo;
diff --git a/sys/src/avutil/base64.rs b/sys/src/avutil/base64.rs
index 0227480..27e2b1c 100644
--- a/sys/src/avutil/base64.rs
+++ b/sys/src/avutil/base64.rs
@@ -5,7 +5,6 @@ pub fn AV_BASE64_SIZE(x: size_t) -> size_t {
 	(x + 2) / 3 * 4 + 1
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_base64_decode(out: *mut uint8_t, inp: *const c_char, out_size: c_int) -> c_int;
 	pub fn av_base64_encode(out: *mut c_char, out_size: c_int, inp: *const uint8_t, in_size: c_int) -> *mut c_char;
diff --git a/sys/src/avutil/blowfish.rs b/sys/src/avutil/blowfish.rs
index e01714d..d0314dc 100644
--- a/sys/src/avutil/blowfish.rs
+++ b/sys/src/avutil/blowfish.rs
@@ -8,7 +8,6 @@ pub struct AVBlowfish {
 	pub s: [[uint32_t; 256]; 4],
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_blowfish_init(ctx: *mut AVBlowfish, key: *const uint8_t, key_len: c_int);
 	pub fn av_blowfish_crypt_ecb(ctx: *mut AVBlowfish, xl: *mut uint32_t, xr: *mut uint32_t, decrypt: c_int);
diff --git a/sys/src/avutil/bprint.rs b/sys/src/avutil/bprint.rs
index bcbd049..5d1b2ea 100644
--- a/sys/src/avutil/bprint.rs
+++ b/sys/src/avutil/bprint.rs
@@ -21,7 +21,6 @@ pub unsafe fn av_bprint_is_complete(buf: *const AVBPrint) -> c_int {
 	}
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_bprint_init(buf: *mut AVBPrint, size_init: c_uint, size_max: c_uint);
 	pub fn av_bprint_init_for_buffer(buf: *mut AVBPrint, buffer: *mut c_char, size: c_uint);
diff --git a/sys/src/avutil/buffer.rs b/sys/src/avutil/buffer.rs
index 33e609e..635f36e 100644
--- a/sys/src/avutil/buffer.rs
+++ b/sys/src/avutil/buffer.rs
@@ -14,7 +14,6 @@ pub type AVBufferPool = c_void;
 
 pub const AV_BUFFER_FLAG_READONLY: c_int = 1;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_buffer_alloc(size: c_int) -> *mut AVBufferRef;
 	pub fn av_buffer_allocz(size: c_int) -> *mut AVBufferRef;
diff --git a/sys/src/avutil/camellia.rs b/sys/src/avutil/camellia.rs
index af8b606..0dc9d6e 100644
--- a/sys/src/avutil/camellia.rs
+++ b/sys/src/avutil/camellia.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, uint8_t};
 
 pub type AVCAMELLIA = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub static av_camellia_size: c_int;
 
diff --git a/sys/src/avutil/cast5.rs b/sys/src/avutil/cast5.rs
index 221842e..8f19217 100644
--- a/sys/src/avutil/cast5.rs
+++ b/sys/src/avutil/cast5.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, uint8_t};
 
 pub type AVCAST5 = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub static av_cast5_size: c_int;
 
diff --git a/sys/src/avutil/channel_layout.rs b/sys/src/avutil/channel_layout.rs
index 217966d..866fd87 100644
--- a/sys/src/avutil/channel_layout.rs
+++ b/sys/src/avutil/channel_layout.rs
@@ -70,7 +70,6 @@ pub enum AVMatrixEncoding {
 	AV_MATRIX_ENCODING_NB
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_get_channel_layout(name: *const c_char) -> uint64_t;
 	pub fn av_get_channel_layout_string(buf: *mut c_char, buf_size: c_int, nb_channels: c_int, channel_layout: uint64_t);
diff --git a/sys/src/avutil/cpu.rs b/sys/src/avutil/cpu.rs
index b460ebd..3d9b192 100644
--- a/sys/src/avutil/cpu.rs
+++ b/sys/src/avutil/cpu.rs
@@ -36,7 +36,6 @@ pub const AV_CPU_FLAG_NEON:     c_uint = 1 << 5;
 pub const AV_CPU_FLAG_ARMV8:    c_uint = 1 << 6;
 pub const AV_CPU_FLAG_SETEND:   c_uint = 1 << 16;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_get_cpu_flags() -> c_int;
 	pub fn av_force_cpu_flags(flags: c_int);
diff --git a/sys/src/avutil/crc.rs b/sys/src/avutil/crc.rs
index 0875bc9..e63a86d 100644
--- a/sys/src/avutil/crc.rs
+++ b/sys/src/avutil/crc.rs
@@ -15,7 +15,6 @@ pub enum AVCRCId {
 	AV_CRC_MAX,
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_crc_init(ctx: *mut AVCRC, le: c_int, bits: c_int, poly: uint32_t, ctx_size: c_int) -> c_int;
 	pub fn av_crc_get_table(crc_id: AVCRCId) -> *const AVCRC;
diff --git a/sys/src/avutil/dict.rs b/sys/src/avutil/dict.rs
index af0f73a..0235dcc 100644
--- a/sys/src/avutil/dict.rs
+++ b/sys/src/avutil/dict.rs
@@ -15,7 +15,6 @@ pub struct AVDictionaryEntry {
 
 pub type AVDictionary = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_dict_get(m: *const AVDictionary, key: *const c_char, prev: *const AVDictionaryEntry, flags: c_int) -> *mut AVDictionaryEntry;
 	pub fn av_dict_count(m: *const AVDictionary) -> c_int;
diff --git a/sys/src/avutil/display.rs b/sys/src/avutil/display.rs
index 4ba9b0c..6cbec40 100644
--- a/sys/src/avutil/display.rs
+++ b/sys/src/avutil/display.rs
@@ -1,6 +1,5 @@
 use libc::{c_int, int32_t, c_double};
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_display_rotation_get(matrix: *const int32_t) -> c_double;
 	pub fn av_display_rotation_set(matrix: *mut int32_t, angle: c_double);
diff --git a/sys/src/avutil/downmix_info.rs b/sys/src/avutil/downmix_info.rs
index 5d9f919..9504689 100644
--- a/sys/src/avutil/downmix_info.rs
+++ b/sys/src/avutil/downmix_info.rs
@@ -25,7 +25,6 @@ pub struct AVDownmixInfo {
 	pub lfe_mix_level: c_double,
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_downmix_info_update_side_data(frame: *mut AVFrame) -> *mut AVDownmixInfo;
 }
diff --git a/sys/src/avutil/error.rs b/sys/src/avutil/error.rs
index 59804cd..922bb09 100644
--- a/sys/src/avutil/error.rs
+++ b/sys/src/avutil/error.rs
@@ -55,7 +55,6 @@ pub unsafe fn av_make_error_string(errbuf: *mut c_char, errbuf_size: size_t, err
 	errbuf
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_strerror(errnum: c_int, errbuf: *mut c_char, errbuf_size: size_t) -> c_int;
 }
diff --git a/sys/src/avutil/eval.rs b/sys/src/avutil/eval.rs
index 36b5eda..14f21f8 100644
--- a/sys/src/avutil/eval.rs
+++ b/sys/src/avutil/eval.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_char, c_int, c_double};
 
 pub type AVExpr = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_expr_parse_and_eval(res: *mut c_double, s: *const c_char,
 	                              const_names: *const *const c_char, const_values: *const c_double,
diff --git a/sys/src/avutil/fifo.rs b/sys/src/avutil/fifo.rs
index d4479c7..20b86be 100644
--- a/sys/src/avutil/fifo.rs
+++ b/sys/src/avutil/fifo.rs
@@ -28,7 +28,6 @@ pub unsafe fn av_fifo_peek2(f: *const AVFifoBuffer, offs: c_int) -> *mut uint8_t
 	}
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_fifo_alloc(size: c_uint) -> *mut AVFifoBuffer;
 	pub fn av_fifo_alloc_array(nmemb: size_t, size: size_t) -> *mut AVFifoBuffer;
diff --git a/sys/src/avutil/file.rs b/sys/src/avutil/file.rs
index fe50147..c9b9636 100644
--- a/sys/src/avutil/file.rs
+++ b/sys/src/avutil/file.rs
@@ -1,6 +1,5 @@
 use libc::{c_void, c_char, c_int, uint8_t, size_t};
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_file_map(filename: *const c_char, bufptr: *mut *mut uint8_t, size: *mut size_t, log_offset: c_int, log_ctx: *mut c_void) -> c_int;
 	pub fn av_file_unmap(bufptr: *mut uint8_t, size: size_t);
diff --git a/sys/src/avutil/frame.rs b/sys/src/avutil/frame.rs
index 64f8ede..1a02c86 100644
--- a/sys/src/avutil/frame.rs
+++ b/sys/src/avutil/frame.rs
@@ -100,7 +100,6 @@ pub struct AVFrame {
 	pub qp_table_buf: *mut AVBufferRef,
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_frame_get_best_effort_timestamp(frame: *const AVFrame) -> int64_t;
 	pub fn av_frame_set_best_effort_timestamp(frame: *mut AVFrame, val: int64_t);
diff --git a/sys/src/avutil/hash.rs b/sys/src/avutil/hash.rs
index acb2cb6..2280617 100644
--- a/sys/src/avutil/hash.rs
+++ b/sys/src/avutil/hash.rs
@@ -4,7 +4,6 @@ pub type AVHashContext = c_void;
 
 pub const AV_HASH_MAX_SIZE: c_int = 64;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_hash_alloc(ctx: *mut *mut AVHashContext, name: *const c_char) -> c_int;
 	pub fn av_hash_names(i: c_int) -> *const c_char;
diff --git a/sys/src/avutil/hmac.rs b/sys/src/avutil/hmac.rs
index bebeb77..a11029e 100644
--- a/sys/src/avutil/hmac.rs
+++ b/sys/src/avutil/hmac.rs
@@ -13,7 +13,6 @@ pub enum AVHMACType {
 
 pub type AVHMAC = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_hmac_alloc(kind: AVHMACType) -> *mut AVHMAC;
 	pub fn av_hmac_free(ctx: *mut AVHMAC);
diff --git a/sys/src/avutil/imgutils.rs b/sys/src/avutil/imgutils.rs
index 3b147ab..a49c80b 100644
--- a/sys/src/avutil/imgutils.rs
+++ b/sys/src/avutil/imgutils.rs
@@ -3,7 +3,6 @@ use super::pixdesc::AVPixFmtDescriptor;
 use super::pixfmt::AVPixelFormat;
 use super::rational::AVRational;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_image_fill_max_pixsteps(max_pixsteps: *mut c_int, max_pixstep_comps: *mut c_int, pixdesc: *const AVPixFmtDescriptor);
 	pub fn av_image_get_linesize(pix_fmt: AVPixelFormat, width: c_int, plane: c_int) -> c_int;
diff --git a/sys/src/avutil/lfg.rs b/sys/src/avutil/lfg.rs
index 2ed312b..7bfc6c4 100644
--- a/sys/src/avutil/lfg.rs
+++ b/sys/src/avutil/lfg.rs
@@ -26,7 +26,6 @@ pub unsafe fn av_mlfg_get(ctx: *mut AVLFG) -> c_uint {
 	c
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_lfg_init(c: *mut AVLFG, seed: c_uint);
 	pub fn av_bmg_get(lfg: *mut AVLFG, out: *mut c_double);
diff --git a/sys/src/avutil/log.rs b/sys/src/avutil/log.rs
index 0b528f4..6d4bfa4 100644
--- a/sys/src/avutil/log.rs
+++ b/sys/src/avutil/log.rs
@@ -77,7 +77,6 @@ pub fn AV_LOG_C(x: c_int) -> c_int {
 	x << 8
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_log(avcl: *mut c_void, level: c_int, fmt: *const char, ...);
 	//pub fn av_vlog(avcl: *mut c_void, level: c_int, fmt: *const c_char, vl: va_list);
diff --git a/sys/src/avutil/lzo.rs b/sys/src/avutil/lzo.rs
index 0660d51..2de72ef 100644
--- a/sys/src/avutil/lzo.rs
+++ b/sys/src/avutil/lzo.rs
@@ -7,7 +7,6 @@ pub const AV_LZO_ERROR:           c_int = 8;
 pub const AV_LZO_INPUT_PADDING:   c_int = 8;
 pub const AV_LZO_OUTPUT_PADDING:  c_int = 12;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_lzo1x_decode(out: *mut c_void, outlen: *mut c_int, inp: *const c_void, inlen: *mut c_int) -> c_int;
 }
diff --git a/sys/src/avutil/mathematics.rs b/sys/src/avutil/mathematics.rs
index 38de639..b60d036 100644
--- a/sys/src/avutil/mathematics.rs
+++ b/sys/src/avutil/mathematics.rs
@@ -12,7 +12,6 @@ pub enum AVRounding {
 	AV_ROUND_PASS_MINMAX = 8192,
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_gcd(a: int64_t, b: int64_t) -> int64_t;
 	pub fn av_rescale(a: int64_t, b: int64_t, c: int64_t) -> int64_t;
diff --git a/sys/src/avutil/md5.rs b/sys/src/avutil/md5.rs
index 08667ed..97218dd 100644
--- a/sys/src/avutil/md5.rs
+++ b/sys/src/avutil/md5.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, uint8_t};
 
 pub type AVMD5 = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub static av_md5_size: c_int;
 
diff --git a/sys/src/avutil/mem.rs b/sys/src/avutil/mem.rs
index 40814ec..619730c 100644
--- a/sys/src/avutil/mem.rs
+++ b/sys/src/avutil/mem.rs
@@ -39,7 +39,6 @@ pub unsafe fn av_mallocz_array(nmemb: size_t, size: size_t) -> *mut c_void {
 //	}
 //}
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_malloc(size: size_t) -> *mut c_void;
 	pub fn av_realloc(ptr: *mut c_void, size: size_t) -> *mut c_void;
diff --git a/sys/src/avutil/mod.rs b/sys/src/avutil/mod.rs
index 30e1f3a..56057a4 100644
--- a/sys/src/avutil/mod.rs
+++ b/sys/src/avutil/mod.rs
@@ -169,3 +169,7 @@ mod util;
 pub use self::util::*;
 pub use self::util::AVMediaType::*;
 pub use self::util::AVPictureType::*;
+
+#[cfg_attr(feature = "static", link(name = "avutil", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "avutil"))]
+extern { }
diff --git a/sys/src/avutil/murmur3.rs b/sys/src/avutil/murmur3.rs
index 89d5e94..e29e44f 100644
--- a/sys/src/avutil/murmur3.rs
+++ b/sys/src/avutil/murmur3.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, uint8_t, uint64_t};
 
 pub type AVMurMur3 = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_murmur3_alloc() -> *mut AVMurMur3;
 	pub fn av_murmur3_init_seeded(c: *mut AVMurMur3, seed: uint64_t);
diff --git a/sys/src/avutil/opt.rs b/sys/src/avutil/opt.rs
index 44a4596..757b3b9 100644
--- a/sys/src/avutil/opt.rs
+++ b/sys/src/avutil/opt.rs
@@ -84,7 +84,6 @@ pub struct AVOptionRanges {
 	pub nb_components: c_int,
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_opt_show2(obj: *mut c_void, av_log_obj: *mut c_void, req_flags: c_int, rej_flags: c_int) -> c_int;
 	pub fn av_opt_set_defaults(s: *mut c_void);
diff --git a/sys/src/avutil/parseutils.rs b/sys/src/avutil/parseutils.rs
index 60dce76..62de07b 100644
--- a/sys/src/avutil/parseutils.rs
+++ b/sys/src/avutil/parseutils.rs
@@ -8,7 +8,6 @@ pub unsafe fn av_parse_ratio_quiet(q: *mut AVRational, string: *const c_char, ma
 	av_parse_ratio(q, string, max, AV_LOG_MAX_OFFSET, ptr::null_mut())
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_parse_ratio(q: *mut AVRational, string: *const c_char, max: c_int, log_offset: c_int, log_ctx: *mut c_void) -> c_int;
 	pub fn av_parse_video_size(width_ptr: *mut c_int, height_ptr: *mut c_int, string: *const c_char) -> c_int;
diff --git a/sys/src/avutil/pixdesc.rs b/sys/src/avutil/pixdesc.rs
index 602b505..666886c 100644
--- a/sys/src/avutil/pixdesc.rs
+++ b/sys/src/avutil/pixdesc.rs
@@ -71,7 +71,6 @@ pub const FF_LOSS_ALPHA:      c_int = 0x0008;
 pub const FF_LOSS_COLORQUANT: c_int = 0x0010;
 pub const FF_LOSS_CHROMA:     c_int = 0x0020;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_read_image_line(dst: *mut uint16_t, data: *const *const uint8_t, linesize: *const c_int, desc: *const AVPixFmtDescriptor, x: c_int, y: c_int, c: c_int, w: c_int, read_pal_component: c_int);
 	pub fn av_write_image_line(src: *const uint16_t, data: *const *const uint8_t, linesize: *const c_int, desc: *const AVPixFmtDescriptor, x: c_int, y: c_int, c: c_int, w: c_int);
diff --git a/sys/src/avutil/random_seed.rs b/sys/src/avutil/random_seed.rs
index b6261c8..ad7543b 100644
--- a/sys/src/avutil/random_seed.rs
+++ b/sys/src/avutil/random_seed.rs
@@ -1,6 +1,5 @@
 use libc::uint32_t;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_get_random_seed() -> uint32_t;
 }
diff --git a/sys/src/avutil/rational.rs b/sys/src/avutil/rational.rs
index 26d539d..38f89ee 100644
--- a/sys/src/avutil/rational.rs
+++ b/sys/src/avutil/rational.rs
@@ -40,7 +40,6 @@ pub unsafe fn av_inv_q(q: AVRational) -> AVRational {
 	AVRational { num: q.den, den: q.num }
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_reduce(dst_num: *mut c_int, dst_den: *mut c_int, num: int64_t, den: int64_t, max: int64_t) -> c_int;
 	pub fn av_mul_q(b: AVRational, c: AVRational) -> AVRational;
diff --git a/sys/src/avutil/ripemd.rs b/sys/src/avutil/ripemd.rs
index e42a678..83e238d 100644
--- a/sys/src/avutil/ripemd.rs
+++ b/sys/src/avutil/ripemd.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, c_uint, uint8_t};
 
 pub type AVRIPEMD = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub static av_ripemd_size: c_int;
 
diff --git a/sys/src/avutil/samplefmt.rs b/sys/src/avutil/samplefmt.rs
index 303e897..e5b5dd4 100644
--- a/sys/src/avutil/samplefmt.rs
+++ b/sys/src/avutil/samplefmt.rs
@@ -19,7 +19,6 @@ pub enum AVSampleFormat {
 	AV_SAMPLE_FMT_NB
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_get_sample_fmt_name(sample_fmt: AVSampleFormat) -> *const c_char;
 	pub fn av_get_sample_fmt(name: *const c_char) -> AVSampleFormat;
diff --git a/sys/src/avutil/sha.rs b/sys/src/avutil/sha.rs
index 783108e..721f72f 100644
--- a/sys/src/avutil/sha.rs
+++ b/sys/src/avutil/sha.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, c_uint, uint8_t};
 
 pub type AVSHA = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub static av_sha_size: c_int;
 
diff --git a/sys/src/avutil/sha512.rs b/sys/src/avutil/sha512.rs
index ab2c77f..d9dd740 100644
--- a/sys/src/avutil/sha512.rs
+++ b/sys/src/avutil/sha512.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, c_uint, uint8_t};
 
 pub type AVSHA512 = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub static av_sha512_size: c_int;
 
diff --git a/sys/src/avutil/stereo3d.rs b/sys/src/avutil/stereo3d.rs
index 071214d..0b6393d 100644
--- a/sys/src/avutil/stereo3d.rs
+++ b/sys/src/avutil/stereo3d.rs
@@ -23,7 +23,6 @@ pub struct AVStereo3D {
 	pub flags: c_int,
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_stereo3d_alloc() -> *mut AVStereo3D;
 	pub fn av_stereo3d_create_side_data(frame: *mut AVFrame) -> *mut AVStereo3D;
diff --git a/sys/src/avutil/string.rs b/sys/src/avutil/string.rs
index a713ab4..2d10b30 100644
--- a/sys/src/avutil/string.rs
+++ b/sys/src/avutil/string.rs
@@ -51,7 +51,6 @@ pub unsafe fn av_tolower(c: c_int) -> c_int {
 	}
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_strstart(string: *const c_char, pfx: *const c_char, ptr: *const *const c_char) -> c_int;
 	pub fn av_stristart(string: *const c_char, pfx: *const c_char, ptr: *const *const c_char) -> c_int;
diff --git a/sys/src/avutil/threadmessage.rs b/sys/src/avutil/threadmessage.rs
index 379f5d5..ac46032 100644
--- a/sys/src/avutil/threadmessage.rs
+++ b/sys/src/avutil/threadmessage.rs
@@ -4,7 +4,6 @@ pub type AVThreadMessageQueue = c_void;
 
 pub const AV_THREAD_MESSAGE_NONBLOCK: c_uint = 1;
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_thread_message_queue_alloc(mq: *mut *mut AVThreadMessageQueue, nelem: c_uint, elsize: c_uint) -> c_int;
 	pub fn av_thread_message_queue_free(mq: *mut *mut AVThreadMessageQueue);
diff --git a/sys/src/avutil/time.rs b/sys/src/avutil/time.rs
index fd0221e..c288545 100644
--- a/sys/src/avutil/time.rs
+++ b/sys/src/avutil/time.rs
@@ -1,6 +1,5 @@
 use libc::{c_int, c_uint, int64_t};
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_gettime() -> int64_t;
 	pub fn av_gettime_relative() -> int64_t;
diff --git a/sys/src/avutil/timecode.rs b/sys/src/avutil/timecode.rs
index 537d323..ddc2eac 100644
--- a/sys/src/avutil/timecode.rs
+++ b/sys/src/avutil/timecode.rs
@@ -14,7 +14,6 @@ pub struct AVTimecode {
 	pub fps:   c_uint,
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_timecode_adjust_ntsc_framenum2(framenum: c_int, fps: c_int) -> c_int;
 	pub fn av_timecode_get_smpte_from_framenum(tc: *const AVTimecode, framenum: c_int) -> uint32_t;
diff --git a/sys/src/avutil/twofish.rs b/sys/src/avutil/twofish.rs
index 362eff4..3d2cff0 100644
--- a/sys/src/avutil/twofish.rs
+++ b/sys/src/avutil/twofish.rs
@@ -2,7 +2,6 @@ use libc::{c_void, c_int, uint8_t};
 
 pub type AVTWOFISH = c_void;
 
-#[link(name = "avutil")]
 extern {
 	pub static av_twofish_size: c_int;
 
diff --git a/sys/src/avutil/util.rs b/sys/src/avutil/util.rs
index cd4e4c3..d4e5107 100644
--- a/sys/src/avutil/util.rs
+++ b/sys/src/avutil/util.rs
@@ -35,7 +35,6 @@ pub enum AVPictureType {
 	AV_PICTURE_TYPE_BI,
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn avutil_version() -> c_uint;
 	pub fn avutil_configuration() -> *const c_char;
diff --git a/sys/src/avutil/xtea.rs b/sys/src/avutil/xtea.rs
index 72a9ceb..b9640a8 100644
--- a/sys/src/avutil/xtea.rs
+++ b/sys/src/avutil/xtea.rs
@@ -6,7 +6,6 @@ pub struct AVXTEA {
 	pub key: [uint32_t; 16],
 }
 
-#[link(name = "avutil")]
 extern {
 	pub fn av_xtea_init(ctx: *mut AVXTEA, key: *const uint8_t);
 	pub fn av_xtea_crypt(ctx: *mut AVXTEA, dst: *mut uint8_t, src: *const uint8_t, count: c_int, iv: *mut uint8_t, decrypt: c_int);
diff --git a/sys/src/postproc/mod.rs b/sys/src/postproc/mod.rs
index 0d20ea5..a108768 100644
--- a/sys/src/postproc/mod.rs
+++ b/sys/src/postproc/mod.rs
@@ -1,2 +1,6 @@
 mod postproc;
 pub use self::postproc::*;
+
+#[cfg_attr(feature = "static", link(name = "postproc", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "postproc"))]
+extern { }
diff --git a/sys/src/postproc/postproc.rs b/sys/src/postproc/postproc.rs
index 0afa5de..57a2392 100644
--- a/sys/src/postproc/postproc.rs
+++ b/sys/src/postproc/postproc.rs
@@ -21,7 +21,6 @@ pub const PP_FORMAT_440: c_int = 0x00000010 | PP_FORMAT;
 
 pub const PP_PICT_TYPE_QP2: c_int = 0x00000010;
 
-#[link(name = "postproc")]
 extern {
 	pub fn postproc_version() -> c_uint;
 	pub fn postproc_configuration() -> *const c_char;
diff --git a/sys/src/swresample/mod.rs b/sys/src/swresample/mod.rs
index f383273..c700513 100644
--- a/sys/src/swresample/mod.rs
+++ b/sys/src/swresample/mod.rs
@@ -3,3 +3,7 @@ pub use self::resample::*;
 pub use self::resample::SwrDitherType::*;
 pub use self::resample::SwrEngine::*;
 pub use self::resample::SwrFilterType::*;
+
+#[cfg_attr(feature = "static", link(name = "swresample", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "swresample"))]
+extern { }
diff --git a/sys/src/swresample/resample.rs b/sys/src/swresample/resample.rs
index abcf686..d8faeae 100644
--- a/sys/src/swresample/resample.rs
+++ b/sys/src/swresample/resample.rs
@@ -42,7 +42,6 @@ pub enum SwrFilterType {
 
 pub type SwrContext = c_void;
 
-#[link(name = "swresample")]
 extern {
 	pub fn swresample_version() -> c_uint;
 	pub fn swresample_configuration() -> *const c_char;
diff --git a/sys/src/swscale/mod.rs b/sys/src/swscale/mod.rs
index db9607f..8db9c77 100644
--- a/sys/src/swscale/mod.rs
+++ b/sys/src/swscale/mod.rs
@@ -1,2 +1,6 @@
 mod scale;
 pub use self::scale::*;
+
+#[cfg_attr(feature = "static", link(name = "swscale", kind = "static"))]
+#[cfg_attr(not(feature = "static"), link(name = "swscale"))]
+extern { }
diff --git a/sys/src/swscale/scale.rs b/sys/src/swscale/scale.rs
index 607d32e..5141ab3 100644
--- a/sys/src/swscale/scale.rs
+++ b/sys/src/swscale/scale.rs
@@ -59,7 +59,6 @@ pub struct SwsFilter {
 
 pub type SwsContext = c_void;
 
-#[link(name = "swscale")]
 extern {
 	pub fn swscale_version() -> c_uint;
 	pub fn swscale_configuration() -> *const c_char;