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Probe to use shared libraries for all depedencies if possible
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@antiagainst
antiagainst committed Jul 30, 2019
1 parent 69adfd6 commit ff876b1
Showing 1 changed file with 45 additions and 28 deletions.
73 changes: 45 additions & 28 deletions shaderc-sys/build/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,6 @@ static SHADERC_STATIC_LIB: &str = "shaderc_combined";
static SHADERC_SHARED_LIB: &str = "shaderc_shared";
static SHADERC_STATIC_LIB_FILE: &str = "libshaderc_combined.a";
static SHADERC_STATIC_LIB_FILE_MSVC: &str = "shaderc_combined.lib";
static SPIRV_STATIC_LIB_FILE: &str = "libSPIRV.a";
static SPIRV_SHARED_LIB_FILE: &str = "libSPIRV.so";

fn build_shaderc(shaderc_dir: &PathBuf, use_ninja: bool) -> PathBuf {
let mut config = cmake::Config::new(shaderc_dir);
Expand Down Expand Up @@ -63,10 +61,20 @@ fn build_shaderc_msvc(shaderc_dir: &PathBuf) -> PathBuf {
config.build()
}

fn probe_linux_lib_kind(lib_name: &str, search_dir: &PathBuf) -> Option<&'static str> {
if search_dir.join(&format!("lib{}.so", lib_name)).exists() {
Some("dylib")
} else if search_dir.join(&format!("lib{}.a", lib_name)).exists() {
Some("static")
} else {
None
}
}

fn main() {
let config_build_from_source = env::var("CARGO_FEATURE_BUILD_FROM_SOURCE").is_ok();
let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
let config_build_from_source = env::var("CARGO_FEATURE_BUILD_FROM_SOURCE").is_ok();
let explicit_lib_dir_set = env::var("SHADERC_LIB_DIR").is_ok();

// Initialize explicit libshaderc search directory first
Expand Down Expand Up @@ -120,12 +128,14 @@ fn main() {

if let Some(search_dir) = search_dir {
let search_dir_str = search_dir.to_string_lossy();

let combined_lib_path =
search_dir.join(if target_os == "windows" && target_env == "msvc" {
SHADERC_STATIC_LIB_FILE_MSVC
} else {
SHADERC_STATIC_LIB_FILE
});

let dylib_name = format!(
"{}{}{}",
consts::DLL_PREFIX,
Expand All @@ -134,40 +144,47 @@ fn main() {
);
let dylib_path = search_dir.join(dylib_name.clone());

if let Some((lib_dir, lib_name, kind)) = {
if let Some((lib_name, kind)) = {
if combined_lib_path.exists() {
Some((&search_dir_str, SHADERC_STATIC_LIB, "static"))
Some((SHADERC_STATIC_LIB, "static"))
} else if dylib_path.exists() {
Some((&search_dir_str, SHADERC_SHARED_LIB, "dylib"))
Some((SHADERC_SHARED_LIB, "dylib"))
} else {
None
}
} {
match (target_os.as_str(), target_env.as_str()) {
("linux", _) => {
println!("cargo:rustc-link-search=native={}", lib_dir);
if let Some((spirv_lib_kind, spirv_lib_link)) = {
if search_dir.join(SPIRV_SHARED_LIB_FILE).exists() {
Some(("shared", ""))
} else if search_dir.join(SPIRV_STATIC_LIB_FILE).exists() {
Some(("static", "static="))
} else {
None
}
} {
println!("cargo:rustc-link-search=native={}", search_dir_str);

// Libraries from the SPIRV-Tools project
let spirv_tools_lib = probe_linux_lib_kind("SPIRV-Tools", &search_dir);
let spirv_tools_opt_lib = probe_linux_lib_kind("SPIRV-Tools-opt", &search_dir);
// Libraries from the Glslang project
let spirv_lib = probe_linux_lib_kind("SPIRV", &search_dir);
let glslang_lib = probe_linux_lib_kind("glslang", &search_dir);

if spirv_tools_lib.is_none()
|| spirv_tools_opt_lib.is_none()
|| spirv_lib.is_none()
|| glslang_lib.is_none()
{
println!(
"cargo:warning=Found and linking {} system installed SPIRV libraries.",
spirv_lib_kind
"cargo:warning=Only shaderc library found. \
Assuming libraries it depends on are built into \
the shaderc library."
);
println!("cargo:rustc-link-lib={}SPIRV", spirv_lib_link);
println!("cargo:rustc-link-lib=static=SPIRV-Tools-opt");
println!("cargo:rustc-link-lib=static=SPIRV-Tools");
println!("cargo:rustc-link-lib=glslang");
} else {
println!("cargo:warning=Found and linking system installed Glslang and SPIRV-Tools libraries.");
println!("cargo:rustc-link-lib={}=glslang", glslang_lib.unwrap());
println!("cargo:rustc-link-lib={}=SPIRV", spirv_lib.unwrap());
println!(
"cargo:warning=Only shaderc library found. \
Assuming SPIRV & glslang libraries built into provided \
shaderc library."
"cargo:rustc-link-lib={}=SPIRV-Tools",
spirv_tools_lib.unwrap()
);
println!(
"cargo:rustc-link-lib={}=SPIRV-Tools-opt",
spirv_tools_opt_lib.unwrap()
);
}
println!("cargo:rustc-link-lib={}={}", kind, lib_name);
Expand All @@ -176,20 +193,20 @@ fn main() {
}
("windows", "msvc") => {
println!("cargo:warning=Windows MSVC static builds experimental");
println!("cargo:rustc-link-search=native={}", lib_dir);
println!("cargo:rustc-link-search=native={}", search_dir_str);
println!("cargo:rustc-link-lib={}={}", kind, lib_name);
return;
}
("windows", "gnu") => {
println!("cargo:warning=Windows MinGW static builds experimental");
println!("cargo:rustc-link-search=native={}", lib_dir);
println!("cargo:rustc-link-search=native={}", search_dir_str);
println!("cargo:rustc-link-lib={}={}", kind, lib_name);
println!("cargo:rustc-link-lib=dylib=stdc++");
return;
}
("macos", _) => {
println!("cargo:warning=MacOS static builds experimental");
println!("cargo:rustc-link-search=native={}", lib_dir);
println!("cargo:rustc-link-search=native={}", search_dir_str);
println!("cargo:rustc-link-lib={}={}", kind, lib_name);
println!("cargo:rustc-link-lib=dylib=c++");
return;
Expand Down

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