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Can't build crate as wasm target #115

Open
frewsxcv opened this issue Feb 24, 2022 · 12 comments
Open

Can't build crate as wasm target #115

frewsxcv opened this issue Feb 24, 2022 · 12 comments

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@frewsxcv
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cargo build --target wasm32-unknown-unknown

error: failed to run custom build command for `proj-sys v0.22.0 (/Users/coreyf/dev/georust/proj/proj-sys)`

Caused by:
  process didn't exit successfully: `/Users/coreyf/dev/georust/proj/target/debug/build/proj-sys-141d6ea7039d6b8c/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=PROJ_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  CMAKE_TOOLCHAIN_FILE_wasm32-unknown-unknown = None
  CMAKE_TOOLCHAIN_FILE_wasm32_unknown_unknown = None
  TARGET_CMAKE_TOOLCHAIN_FILE = None
  CMAKE_TOOLCHAIN_FILE = None
  CMAKE_GENERATOR_wasm32-unknown-unknown = None
  CMAKE_GENERATOR_wasm32_unknown_unknown = None
  TARGET_CMAKE_GENERATOR = None
  CMAKE_GENERATOR = None
  CMAKE_PREFIX_PATH_wasm32-unknown-unknown = None
  CMAKE_PREFIX_PATH_wasm32_unknown_unknown = None
  TARGET_CMAKE_PREFIX_PATH = None
  CMAKE_PREFIX_PATH = None
  CMAKE_wasm32-unknown-unknown = None
  CMAKE_wasm32_unknown_unknown = None
  TARGET_CMAKE = None
  CMAKE = None
  running: "cmake" "/Users/coreyf/dev/georust/proj/proj-sys/PROJSRC/proj/proj-8.1.0" "-DBUILD_SHARED_LIBS=OFF" "-DBUILD_TESTING=OFF" "-DBUILD_CCT=OFF" "-DBUILD_CS2CS=OFF" "-DBUILD_GEOD=OFF" "-DBUILD_GIE=OFF" "-DBUILD_PROJ=OFF" "-DBUILD_PROJINFO=OFF" "-DBUILD_PROJSYNC=OFF" "-DENABLE_CURL=OFF" "-DENABLE_TIFF=OFF" "-DCMAKE_INSTALL_PREFIX=/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown" "-DCMAKE_C_COMPILER=/opt/homebrew/opt/llvm/bin/clang" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown" "-DCMAKE_CXX_COMPILER=/opt/homebrew/opt/llvm/bin/clang" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown" "-DCMAKE_ASM_COMPILER=/opt/homebrew/opt/llvm/bin/clang" "-DCMAKE_BUILD_TYPE=Debug"
  -- The C compiler identification is Clang 13.0.0
  -- The CXX compiler identification is Clang 13.0.0
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - failed
  -- Check for working C compiler: /opt/homebrew/opt/llvm/bin/clang
  -- Check for working C compiler: /opt/homebrew/opt/llvm/bin/clang - broken
  -- Configuring incomplete, errors occurred!
  See also "/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeOutput.log".
  See also "/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeError.log".

  --- stderr
  pkg-config unable to find existing libproj installation: pkg-config has not been configured to support cross-compilation.

  Install a sysroot for the target platform and configure it via
  PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a
  cross-compiling wrapper for pkg-config and set it via
  PKG_CONFIG environment variable.
  building libproj from source
  disabling tiff support
  CMake Error at /opt/homebrew/Cellar/cmake/3.22.2/share/cmake/Modules/CMakeTestCCompiler.cmake:69 (message):
    The C compiler

      "/opt/homebrew/opt/llvm/bin/clang"

    is not able to compile a simple test program.

    It fails with the following output:

      Change Dir: /Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeTmp
      
      Run Build Command(s):/usr/bin/make -f Makefile cmTC_87c4b/fast && /Library/Developer/CommandLineTools/usr/bin/make  -f CMakeFiles/cmTC_87c4b.dir/build.make CMakeFiles/cmTC_87c4b.dir/build
      Building C object CMakeFiles/cmTC_87c4b.dir/testCCompiler.c.o
      /opt/homebrew/opt/llvm/bin/clang   -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown  -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk -MD -MT CMakeFiles/cmTC_87c4b.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_87c4b.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_87c4b.dir/testCCompiler.c.o -c /Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeTmp/testCCompiler.c
      clang-13: warning: argument unused during compilation: '-arch arm64' [-Wunused-command-line-argument]
      Linking C executable cmTC_87c4b
      /opt/homebrew/Cellar/cmake/3.22.2/bin/cmake -E cmake_link_script CMakeFiles/cmTC_87c4b.dir/link.txt --verbose=1
      /opt/homebrew/opt/llvm/bin/clang  -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown  -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk -Wl,-search_paths_first -Wl,-headerpad_max_install_names -L/opt/homebrew/opt/llvm/lib  CMakeFiles/cmTC_87c4b.dir/testCCompiler.c.o -o cmTC_87c4b 
      clang-13: warning: argument unused during compilation: '-arch arm64' [-Wunused-command-line-argument]
      wasm-ld: error: unknown argument: -search_paths_first
      wasm-ld: error: unknown argument: -headerpad_max_install_names
      wasm-ld: error: cannot open crt1.o: No such file or directory
      wasm-ld: error: unable to find library -lc
      wasm-ld: error: cannot open /opt/homebrew/Cellar/llvm/13.0.0_2/lib/clang/13.0.0/lib/libclang_rt.builtins-wasm32.a: No such file or directory
      clang-13: error: linker command failed with exit code 1 (use -v to see invocation)
      make[1]: *** [cmTC_87c4b] Error 1
      make: *** [cmTC_87c4b/fast] Error 2
      
      

    

    CMake will not be able to correctly generate this project.
  Call Stack (most recent call first):
    CMakeLists.txt:14 (project)


  thread 'main' panicked at '
  command did not execute successfully, got: exit status: 1

  build script failed, must exit now', /Users/coreyf/.cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.48/src/lib.rs:975:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
@michaelkirk
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I haven't seen any crates with native dependencies buildable in a wasm/browser environment.

I'd be interested if there are any working examples of what that could look like.

@frewsxcv
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Clang does support building wasm32 as a target (I think?) and if not Clang then at least setting the C compiler to Emscripten should work, but I haven't got that to work either.

@frewsxcv
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export CC=emcc

cargo build --target wasm32-unknown-unknown
   Compiling proj-sys v0.22.0 (/Users/coreyf/dev/georust/proj/proj-sys)
error: failed to run custom build command for `proj-sys v0.22.0 (/Users/coreyf/dev/georust/proj/proj-sys)`

Caused by:
  process didn't exit successfully: `/Users/coreyf/dev/georust/proj/target/debug/build/proj-sys-141d6ea7039d6b8c/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=PROJ_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  CMAKE_TOOLCHAIN_FILE_wasm32-unknown-unknown = None
  CMAKE_TOOLCHAIN_FILE_wasm32_unknown_unknown = None
  TARGET_CMAKE_TOOLCHAIN_FILE = None
  CMAKE_TOOLCHAIN_FILE = None
  CMAKE_GENERATOR_wasm32-unknown-unknown = None
  CMAKE_GENERATOR_wasm32_unknown_unknown = None
  TARGET_CMAKE_GENERATOR = None
  CMAKE_GENERATOR = None
  CMAKE_PREFIX_PATH_wasm32-unknown-unknown = None
  CMAKE_PREFIX_PATH_wasm32_unknown_unknown = None
  TARGET_CMAKE_PREFIX_PATH = None
  CMAKE_PREFIX_PATH = None
  CMAKE_wasm32-unknown-unknown = None
  CMAKE_wasm32_unknown_unknown = None
  TARGET_CMAKE = None
  CMAKE = None
  running: "cmake" "/Users/coreyf/dev/georust/proj/proj-sys/PROJSRC/proj/proj-8.1.0" "-DBUILD_SHARED_LIBS=OFF" "-DBUILD_TESTING=OFF" "-DBUILD_CCT=OFF" "-DBUILD_CS2CS=OFF" "-DBUILD_GEOD=OFF" "-DBUILD_GIE=OFF" "-DBUILD_PROJ=OFF" "-DBUILD_PROJINFO=OFF" "-DBUILD_PROJSYNC=OFF" "-DENABLE_CURL=OFF" "-DENABLE_TIFF=OFF" "-DCMAKE_INSTALL_PREFIX=/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC" "-DCMAKE_C_COMPILER=/opt/homebrew/bin/emcc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown" "-DCMAKE_CXX_COMPILER=/opt/homebrew/opt/llvm/bin/clang" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC" "-DCMAKE_ASM_COMPILER=/opt/homebrew/bin/emcc" "-DCMAKE_BUILD_TYPE=Debug"
  -- The C compiler identification is Clang 14.0.0
  -- The CXX compiler identification is Clang 13.0.0
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - failed
  -- Check for working C compiler: /opt/homebrew/bin/emcc
  -- Check for working C compiler: /opt/homebrew/bin/emcc - broken
  -- Configuring incomplete, errors occurred!
  See also "/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeOutput.log".
  See also "/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeError.log".

  --- stderr
  pkg-config unable to find existing libproj installation: pkg-config has not been configured to support cross-compilation.

  Install a sysroot for the target platform and configure it via
  PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a
  cross-compiling wrapper for pkg-config and set it via
  PKG_CONFIG environment variable.
  building libproj from source
  disabling tiff support
  CMake Error at /opt/homebrew/Cellar/cmake/3.22.2/share/cmake/Modules/CMakeTestCCompiler.cmake:69 (message):
    The C compiler

      "/opt/homebrew/bin/emcc"

    is not able to compile a simple test program.

    It fails with the following output:

      Change Dir: /Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeTmp
      
      Run Build Command(s):/usr/bin/make -f Makefile cmTC_42d34/fast && /Library/Developer/CommandLineTools/usr/bin/make  -f CMakeFiles/cmTC_42d34.dir/build.make CMakeFiles/cmTC_42d34.dir/build
      Building C object CMakeFiles/cmTC_42d34.dir/testCCompiler.c.o
      /opt/homebrew/bin/emcc   -ffunction-sections -fdata-sections -fPIC  -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk -MD -MT CMakeFiles/cmTC_42d34.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_42d34.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_42d34.dir/testCCompiler.c.o -c /Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeTmp/testCCompiler.c
      emcc: error: arm64: No such file or directory ("arm64" was expected to be an input file, based on the commandline arguments provided)
      make[1]: *** [CMakeFiles/cmTC_42d34.dir/testCCompiler.c.o] Error 1
      make: *** [cmTC_42d34/fast] Error 2
      
      

    

    CMake will not be able to correctly generate this project.
  Call Stack (most recent call first):
    CMakeLists.txt:14 (project)


  thread 'main' panicked at '
  command did not execute successfully, got: exit status: 1

  build script failed, must exit now', /Users/coreyf/.cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.48/src/lib.rs:975:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
~/d/g/proj (master|…) [101] $ export CC=emcc
~/d/g/proj (master|…) $ export C^C
~/d/g/proj (master|…) $ cargo build --target wasm32-unknown-unknown
   Compiling proj-sys v0.22.0 (/Users/coreyf/dev/georust/proj/proj-sys)
error: failed to run custom build command for `proj-sys v0.22.0 (/Users/coreyf/dev/georust/proj/proj-sys)`

Caused by:
  process didn't exit successfully: `/Users/coreyf/dev/georust/proj/target/debug/build/proj-sys-141d6ea7039d6b8c/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=PROJ_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_wasm32-unknown-unknown
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_wasm32_unknown_unknown
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  CMAKE_TOOLCHAIN_FILE_wasm32-unknown-unknown = None
  CMAKE_TOOLCHAIN_FILE_wasm32_unknown_unknown = None
  TARGET_CMAKE_TOOLCHAIN_FILE = None
  CMAKE_TOOLCHAIN_FILE = None
  CMAKE_GENERATOR_wasm32-unknown-unknown = None
  CMAKE_GENERATOR_wasm32_unknown_unknown = None
  TARGET_CMAKE_GENERATOR = None
  CMAKE_GENERATOR = None
  CMAKE_PREFIX_PATH_wasm32-unknown-unknown = None
  CMAKE_PREFIX_PATH_wasm32_unknown_unknown = None
  TARGET_CMAKE_PREFIX_PATH = None
  CMAKE_PREFIX_PATH = None
  CMAKE_wasm32-unknown-unknown = None
  CMAKE_wasm32_unknown_unknown = None
  TARGET_CMAKE = None
  CMAKE = None
  running: "cmake" "/Users/coreyf/dev/georust/proj/proj-sys/PROJSRC/proj/proj-8.1.0" "-DBUILD_SHARED_LIBS=OFF" "-DBUILD_TESTING=OFF" "-DBUILD_CCT=OFF" "-DBUILD_CS2CS=OFF" "-DBUILD_GEOD=OFF" "-DBUILD_GIE=OFF" "-DBUILD_PROJ=OFF" "-DBUILD_PROJINFO=OFF" "-DBUILD_PROJSYNC=OFF" "-DENABLE_CURL=OFF" "-DENABLE_TIFF=OFF" "-DCMAKE_INSTALL_PREFIX=/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC" "-DCMAKE_C_COMPILER=/opt/homebrew/bin/emcc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown" "-DCMAKE_CXX_COMPILER=/opt/homebrew/opt/llvm/bin/clang" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC" "-DCMAKE_ASM_COMPILER=/opt/homebrew/bin/emcc" "-DCMAKE_BUILD_TYPE=Debug"
  -- The C compiler identification is Clang 14.0.0
  -- The CXX compiler identification is Clang 13.0.0
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - failed
  -- Check for working C compiler: /opt/homebrew/bin/emcc
  -- Check for working C compiler: /opt/homebrew/bin/emcc - broken
  -- Configuring incomplete, errors occurred!
  See also "/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeOutput.log".
  See also "/Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeError.log".

  --- stderr
  pkg-config unable to find existing libproj installation: pkg-config has not been configured to support cross-compilation.

  Install a sysroot for the target platform and configure it via
  PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a
  cross-compiling wrapper for pkg-config and set it via
  PKG_CONFIG environment variable.
  building libproj from source
  disabling tiff support
  CMake Error at /opt/homebrew/Cellar/cmake/3.22.2/share/cmake/Modules/CMakeTestCCompiler.cmake:69 (message):
    The C compiler

      "/opt/homebrew/bin/emcc"

    is not able to compile a simple test program.

    It fails with the following output:

      Change Dir: /Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeTmp
      
      Run Build Command(s):/usr/bin/make -f Makefile cmTC_85c58/fast && /Library/Developer/CommandLineTools/usr/bin/make  -f CMakeFiles/cmTC_85c58.dir/build.make CMakeFiles/cmTC_85c58.dir/build
      Building C object CMakeFiles/cmTC_85c58.dir/testCCompiler.c.o
      /opt/homebrew/bin/emcc   -ffunction-sections -fdata-sections -fPIC  -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk -MD -MT CMakeFiles/cmTC_85c58.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_85c58.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_85c58.dir/testCCompiler.c.o -c /Users/coreyf/dev/georust/proj/target/wasm32-unknown-unknown/debug/build/proj-sys-53bbbe1c8a420d33/out/build/CMakeFiles/CMakeTmp/testCCompiler.c
      emcc: error: arm64: No such file or directory ("arm64" was expected to be an input file, based on the commandline arguments provided)
      make[1]: *** [CMakeFiles/cmTC_85c58.dir/testCCompiler.c.o] Error 1
      make: *** [cmTC_85c58/fast] Error 2
      
      

    

    CMake will not be able to correctly generate this project.
  Call Stack (most recent call first):
    CMakeLists.txt:14 (project)


  thread 'main' panicked at '
  command did not execute successfully, got: exit status: 1

  build script failed, must exit now', /Users/coreyf/.cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.48/src/lib.rs:975:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

@kylebarron
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Maybe relevant: ZSTD added support for wasm32-unknown-unknown in gyscos/zstd-rs#139 by adding shims for stdlib.h and string.h. But that seems unrelated to

pkg-config unable to find existing libproj installation: pkg-config has not been configured to support cross-compilation

@frewsxcv
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frewsxcv commented Mar 5, 2022

Another relevant link rustwasm/team#291

@kylebarron
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I spent a couple minutes trying to build for wasm32-unknown-emscripten without much luck. These build changes helped progress a little further

--- a/proj-sys/build.rs
+++ b/proj-sys/build.rs
@@ -88,6 +88,10 @@ fn build_from_source() -> Result<std::path::PathBuf, Box<dyn std::error::Error>>
     let mut archive = Archive::new(tar);
     archive.unpack("PROJSRC/proj")?;
     let mut config = cmake::Config::new("PROJSRC/proj/proj-8.1.0");
+    config.define("CMAKE_TRY_COMPILE_TARGET_TYPE", "STATIC_LIBRARY");
+    config.define("CMAKE_C_COMPILER_WORKS", "1");
+    config.define("CMAKE_CXX_COMPILER_WORKS", "1");
+    config.define("USE_THREAD", "0");
     config.define("BUILD_SHARED_LIBS", "OFF");
     config.define("BUILD_TESTING", "OFF");
     config.define("BUILD_CCT", "OFF");

@kylebarron
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IMO wasm32-unknown-unknown is pretty hopeless for the current time given Proj's reliance on several system libs, not least Sqlite3 (potentially unless you go back to a proj version before they added sqlite3 as a dependency).

That leaves wasm32-unknown-emscripten, which at least in principle has the potential to work. I think the first course of action here would be to build Proj to emscripten outside of rust, just to verify dependencies can compile.

When I run

git clone https://github.com/OSGeo/PROJ
cd PROJ
mkdir build
cd build
emcmake cmake -DBUILD_APPS=OFF -DBUILD_SHARED_LIBS=OFF -DBUILD_TESTING=OFF -DENABLE_TIFF=OFF ..

I get

CMake Error at CMakeLists.txt:176 (message):
  sqlite3 dependency not found!

sqlite3 can be built to WASM via emscripten (see https://github.com/sql-js/sql.js). So the next step would be figuring out how to first build sqlite3 via emscripten then use that built sqlite3 to link to proj. Maybe relevant: https://emscripten.org/docs/compiling/Building-Projects.html#using-libraries

@pka
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pka commented Mar 12, 2022

There seems to be a Proj build for WASM: https://github.com/jvail/spl.js

@Rennzie
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Rennzie commented Jun 7, 2022

Has anyone had any luck compiling for WASM?

@frewsxcv
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OSGeo/PROJ-JNI#40

@kylebarron
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Also a note that someone on this rust+wasm+c thread seems to have made an example repo for creating a wasm-pack build using targets other than wasm32-unknown-unknown.

@urschrei
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Useful thread: rustwasm/team#291

@kylebarron kylebarron mentioned this issue Jun 19, 2022
Closed
@rafaelbeckel rafaelbeckel mentioned this issue Jun 2, 2024
Merged
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@pka @urschrei @michaelkirk @frewsxcv @kylebarron @Rennzie