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社区首页 >问答首页 >锈菌+ wasm (酵母->货网启动) ->致命错误：“math.h”文件未找到

问锈菌+ wasm (酵母->货网启动) ->致命错误：“math.h”文件未找到
EN

Stack Overflow用户
提问于 2020-02-12 12:44:57
回答 1查看 698关注 0票数 2

我目前正在使用C和Rust开发一个应用程序，当它以下列任何一种方式使用时，没有任何问题：

  • C -> C(迅速)
  • C -> ->锈病->示例(控制台锈蚀)

但是当我想通过Yew的wasm访问时，事情变得越来越复杂了

  • C -> Rust -> Yew/WASM (货网启动)

链接器抛出一个错误："math.h“丢失

维基百科引文：https://en.wikipedia.org/wiki/C_mathematical_functions

在Linux和BSD环境下，数学函数(如在

中声明的)分别捆绑在数学库libm中。因此，如果使用这些函数中的任何一个，则必须向链接器提供指令-lm。

虽然我增加了旗子，但没有改变任何东西.

下面我包含了库文件绑定的build.rs文件C -> Rust：

代码语言：javascript
复制
use std::env;
use std::path::Path;

fn main() {
    let dir = env::var("CARGO_MANIFEST_DIR").unwrap();
    cc::Build::new()
        .flag("-g")
        //        .flag("-09")
       .flag("-lm") // math.h for wasm (dosen't work or without)
       .flag("-Wall")
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swecl.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swedate.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swehel.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swehouse.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swejpl.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swemmoon.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swemplan.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swepcalc.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/sweph.c"))
       .file(Path::new(&dir).join("src/swisseph/2.08/src/swephlib.c"))
       .compile("swe")
  }

这是我在红豆杉中编译的错误日志(货网开始)。

代码语言：javascript
复制
Compiling libswe-sys v0.1.4
Compiling stdweb v0.4.20
error: failed to run custom build command for libswe-sys v0.1.4

--- stdout
TARGET = Some("wasm32-unknown-unknown")
OPT_LEVEL = Some("0")
HOST = Some("x86_64-apple-darwin")
CC_wasm32-unknown-unknown = None
CC_wasm32_unknown_unknown = None
TARGET_CC = None
CC = None
CFLAGS_wasm32-unknown-unknown = None
CFLAGS_wasm32_unknown_unknown = None
TARGET_CFLAGS = None
CFLAGS = None
CRATE_CC_NO_DEFAULTS = None
DEBUG = Some("true")
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-lm" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-2679bddccf8cd805/out/swedate.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swedate.c"
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-lm" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-2679bddccf8cd805/out/swecl.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swecl.c"
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-lm" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-2679bddccf8cd805/out/swehel.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swehel.c"
cargo:warning=clang: warning: -lm: 'linker' input unused [-Wunused-command-line-argument]
cargo:warning=clang: warning: -lm: 'linker' input unused [-Wunused-command-line-argument]
cargo:warning=clang: warning: -lm: 'linker' input unused [-Wunused-command-line-argument]
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swedate.c:86:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/sweodef.h:167:10: fatal error: 'math.h' file not found
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swecl.c:62:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swejpl.h:67:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/sweodef.h:167:10: fatal error: 'math.h' file not found
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swehel.c:68:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/sweodef.h:167:10: fatal error: 'math.h' file not found
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~`
cargo:warning=1 error generated.
exit code: 1
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-lm" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-2679bddccf8cd805/out/swehouse.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swehouse.c"
cargo:warning=1 error generated.
exit code: 1
cargo:warning=clang: warning: -lm: 'linker' input unused [-Wunused-command-line-argument]
cargo:warning=1 error generated.
exit code: 1
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swehouse.c:63:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/sweodef.h:167:10: fatal error: 'math.h' file not found
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
cargo:warning=1 error generated.
exit code: 1

--- stderr


error occurred: Command "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-lm" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-2679bddccf8cd805/out/swecl.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.4/src/swisseph/2.08/src/swecl.c" with args "clang" did not execute successfully (status code exit code: 1).



warning: build failed, waiting for other jobs to finish...

你有什么建议？

  • 找到math.c/math.h文件，并将其包含在我的库c ->锈病
  • ？

中。

编辑：

我尝试了两种行不通的方法：

在我的图书馆的/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/math.h

  • 添加.include("/usr/include")上，
    • 手动添加一个math.h

这两种方法编译我的libswe-sys (0.1.5和0.1.6)

这是黄豆杉的原木：

使用0.1.5的

  • (手动计算h)

代码语言：javascript
复制
error: failed to run custom build command for `libswe-sys v0.1.5`

--- stdout
TARGET = Some("wasm32-unknown-unknown")
OPT_LEVEL = Some("0")
HOST = Some("x86_64-apple-darwin")
CC_wasm32-unknown-unknown = None
CC_wasm32_unknown_unknown = None
TARGET_CC = None
CC = None
CFLAGS_wasm32-unknown-unknown = None
CFLAGS_wasm32_unknown_unknown = None
TARGET_CFLAGS = None
CFLAGS = None
CRATE_CC_NO_DEFAULTS = None
DEBUG = Some("true")
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-b52a4354b3363d0b/out/swedate.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swedate.c"
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-b52a4354b3363d0b/out/swecl.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swecl.c"
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swedate.c:86:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/sweodef.h:167:10: error: 'math.h' file not found with <angled> include; use "quotes" instead
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
cargo:warning=         "math.h"
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swecl.c:62:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swejpl.h:67:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/sweodef.h:167:10: error: 'math.h' file not found with <angled> include; use "quotes" instead
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
cargo:warning=         "math.h"
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swedate.c:86:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swecl.c:62:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swejpl.h:67:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/sweodef.h:167:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/sweodef.h:167:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/math.h:295:10: fatal error: '__config' file not found
cargo:warning=#include <__config>
cargo:warning=         ^~~~~~~~~~
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/math.h:295:10: fatal error: '__config' file not found
cargo:warning=#include <__config>
cargo:warning=         ^~~~~~~~~~
cargo:warning=2 errors generated.
exit code: 1
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-b52a4354b3363d0b/out/swehel.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swehel.c"
cargo:warning=2 errors generated.
exit code: 1
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swehel.c:68:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/sweodef.h:167:10: error: 'math.h' file not found with <angled> include; use "quotes" instead
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
cargo:warning=         "math.h"
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swehel.c:68:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/sweodef.h:167:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/math.h:295:10: fatal error: '__config' file not found
cargo:warning=#include <__config>
cargo:warning=         ^~~~~~~~~~
cargo:warning=2 errors generated.
exit code: 1

--- stderr


error occurred: Command "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-g" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-b52a4354b3363d0b/out/swecl.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.5/src/swisseph/2.08/src/swecl.c" with args "clang" did not execute successfully (status code exit code: 1).



warning: build failed, waiting for other jobs to finish...
error: build failed
error: build failed

  • 0.1.6 (添加.include("/usr/include") )在build.rs of my library

中

代码语言：javascript
复制
error: failed to run custom build command for `libswe-sys v0.1.6`

--- stdout
TARGET = Some("wasm32-unknown-unknown")
OPT_LEVEL = Some("0")
HOST = Some("x86_64-apple-darwin")
CC_wasm32-unknown-unknown = None
CC_wasm32_unknown_unknown = None
TARGET_CC = None
CC = None
CFLAGS_wasm32-unknown-unknown = None
CFLAGS_wasm32_unknown_unknown = None
TARGET_CFLAGS = None
CFLAGS = None
CRATE_CC_NO_DEFAULTS = None
DEBUG = Some("true")
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-I" "/usr/include" "-Wall" "-Wextra" "-g" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-08f220b2455dd53e/out/swecl.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swecl.c"
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-I" "/usr/include" "-Wall" "-Wextra" "-g" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-08f220b2455dd53e/out/swedate.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swedate.c"
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swedate.c:86:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/sweodef.h:167:10: fatal error: 'math.h' file not found
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swecl.c:62:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swejpl.h:67:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/sweodef.h:167:10: fatal error: 'math.h' file not found
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
cargo:warning=1 error generated.
exit code: 1
running: "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-I" "/usr/include" "-Wall" "-Wextra" "-g" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-08f220b2455dd53e/out/swehel.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swehel.c"
cargo:warning=1 error generated.
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swehel.c:68:
cargo:warning=In file included from /Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swephexp.h:83:
cargo:warning=/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/sweodef.h:167:10: fatal error: 'math.h' file not found
cargo:warning=#include <math.h>
cargo:warning=         ^~~~~~~~
exit code: 1
cargo:warning=1 error generated.
exit code: 1

--- stderr


error occurred: Command "clang" "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-I" "/usr/include" "-Wall" "-Wextra" "-g" "-Wall" "-o" "/Users/stephanebressani/Code/Rust/yewastrology/target/wasm32-unknown-unknown/debug/build/libswe-sys-08f220b2455dd53e/out/swecl.o" "-c" "/Users/stephanebressani/.cargo/registry/src/github.com-1ecc6299db9ec823/libswe-sys-0.1.6/src/swisseph/2.08/src/swecl.c" with args "clang" did not execute successfully (status code exit code: 1).



warning: build failed, waiting for other jobs to finish...
error: build failed
error: build failed

这是我的红豆杉设置(非常小，就像一个hello world项目)：

Cargo.toml

代码语言：javascript
复制
[package]
name = "yewastrology"
version = "0.1.0"
authors = ["stephaneworkspace <s.bressani@bluewin.ch>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
yew = "0.11.0"
astrology = "0.1.24"

src/main.rs

代码语言：javascript
复制
use astrology::{WorkingStorageYew, YewAction, YewAstro};
use yew::{
    html, Callback, ClickEvent, Component, ComponentLink, Html, ShouldRender,
};

struct App {
    clicked: bool,
    onclick: Callback<ClickEvent>,
}

enum Msg {
    Click,
}

impl Component for App {
    type Message = Msg;
    type Properties = ();

    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
        App {
            clicked: false,
            onclick: link.callback(|_| Msg::Click),
        }
    }

    fn update(&mut self, msg: Self::Message) -> ShouldRender {
        match msg {
            Msg::Click => {
                self.clicked = true;
                true // Indicate that the Component should re-render
            },
        }
    }

    fn view(&self) -> Html {
        let button_text: String = if self.clicked {
            // Ephem file and better path todo later !
            let ws = WorkingStorageYew::new(
                "/Users/stephanebressani/Code/Rust/yewastrology/data.json",
                "",
                550,
            );
            let ok = ws.yew_draw_chart(YewAction::Chart);
            let result = ok.0;
            result
        } else {
            "Click me!".to_string()
        };

        if !self.clicked {
            html! {
                <button onclick=&self.onclick>{ button_text }</button>
            }
        } else {
            html! {
                <h1>{ button_text }</h1>
            }
        }
    }
}

fn main() {
    yew::start_app::<App>();
}

和data.json

代码语言：javascript
复制
{
        "year": 1999,
        "month": 12,
        "day": 31,
        "hourf64": 23.59,
        "hour": 23,
        "min": 59,
        "sec": 0.0,
        "lat": 46.0222,
        "lng": 6.14569
}

对于0.1.5 (手动添加一个math.h)，源是不兼容的，您有兼容的吗？

我刚刚在我的mac书上尝试了第一次搜索(在不同的路径中搜索结果)。

编辑2：

我发现了这个：

https://github.com/rust-lang/libc/issues/858

根据

的定义，是32-未知-未知没有libc。如果您想使用emscripten或wasi，您可以使用wasi 32-未知-emscripten或wasm32-wasi，这两种都已经在libc机箱中得到了支持。

我试着使用验证器(问题编译，因为我的货物中的lib，ansi_term库是不可弥补的)和wasi -相同的问题-未知-未知，与math.h的问题。

yew
c
rust
ffi
math.h
EN

回答 1

Stack Overflow用户

发布于 2020-02-12 17:01:37

您将两件事混为一谈：-lm是链接器的标志，用于链接libm.so.6库；math.h not错误用于头文件。

很可能，您丢失了Linux上的libc6-dev包。

由于您没有提供一个最小的可重现性示例，下面是我尝试过的一个示例，它的工作原理与预期的一样。项目布局：

代码语言：javascript
复制
├── build.rs
├── Cargo.toml
└── src
    ├── cmath.c
    └── main.rs

货物档案：

代码语言：javascript
复制
[package]
name = "math-ffi"
version = "0.1.0"
authors = ["rustacean"]
edition = "2018"

[dependencies]
libc = "0.2"

[build-dependencies]
cc = "1.0"

The build.rs

代码语言：javascript
复制
fn main() {
    cc::Build::new()
        .include("/usr/include")  // standard location, YMMV
        .flag("-g")
        .flag("-Wall")
        .file("src/cmath.c")
        .compile("math_ffi");
}

C文件：

代码语言：javascript
复制
#include <math.h>

#define PI 3.14159265

double cos_radian(double x) {
    return cos(x * PI / 180);
}

和锈病入境点：

代码语言：javascript
复制
use libc::c_double;

extern "C"  {
    fn cos_radian(_: c_double) -> c_double;
}

fn main() {
    let res = unsafe {
        cos_radian(180.0)
    };
    println!("{}", res);
}

它成功构建并正确返回-1。ldd显示它按应有的方式链接到libm：

代码语言：javascript
复制
$ ldd target/debug/math-ffi
    linux-vdso.so.1 (0x00007ffc60db1000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f8e889e3000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f8e889c0000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8e889a6000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8e887b5000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f8e88a43000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8e88666000)
票数 1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/60188673

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