Bazel 目標在 gcc 中編譯但在 emscripten 中失敗
[英]Bazel target compiles in gcc but fails in emscripten
問題描述
我正在使用 Bazel 構建一個系統，其中我有一個 c++ 目標和一個要編譯為 web 程序集的 emscirpten (emcc) 目標。 兩者都依賴於“myAPI”，它具有外部依賴性 libpng、libz、opencv 和其他一些。
這編譯正確：
# Development
cc_binary(
name = "devMain",
srcs = ["dev/main.cpp"],
copts = [
"-w",
"-g",
"-O3",
"--std=c++2a",
"-pthread",
"-Iinclude/",
"-Iexternal/geometryCentralRepo/include",
"-Iexternal/eigenRepo",
"-DBUILD_VERSION=devMain",
],
deps = [
":myAPI",
],
linkopts = ["-lpthread"],
)
但是，這失敗了：
DEFAULT_EMSCRIPTEN_LINKOPTS = [
"-s EXTRA_EXPORTED_RUNTIME_METHODS=['ccall']",
"-s ALLOW_MEMORY_GROWTH=1", # Our example doesn't need memory growth
"-s ASSERTIONS=1", # Turn off assertions
"-s EXPORT_ES6=1", # Export as es6 module, used for rollup
"-s MODULARIZE=1", # Allows us to manually invoke the initialization of wasm
"-s EXPORT_NAME=myAPI", # Not used, but good to specify
"-s USE_ES6_IMPORT_META=0", # Disable loading from import meta since we use rollup
"-s EXPORT_ALL=1",
"-s USE_PTHREADS=1",
"-s ENVIRONMENT=worker",
"-DNDEBUG",
]
WASM_LINKOPTS = [
"-s WASM=1",
"--bind", # Specify wasm output
]
cc_binary(
name = "myAPI.js",
srcs=["src/myAPI/WASM_bindings.cpp"],
copts = [
"-g",
"-O3",
"--std=c++2a",
"-pthread",
"-Iinclude/",
],
linkopts = DEFAULT_EMSCRIPTEN_LINKOPTS + WASM_LINKOPTS,
deps = [
":myAPI",
],
)
wasm_cc_binary(
name = "setupModel-wasm",
cc_target = ":myAPI.js",
)
這是我的API：
cc_library(
name = "myAPI",
srcs = glob(["src/**/*.c*"], exclude=["src/myAPI/WASM_bindings.cpp"]),
hdrs = glob(["include/**/*.h*"]),
copts = [
"-w",
"-g",
"-O3",
"--std=c++2a",
"-pthread",
"-Iinclude",
"-Iexternal/geometryCentralRepo/include",
"-Iexternal/spdlogRepo/include",
"-Iexternal/libiglRepo/include",
"-Iexternal/openCVRepo/include",
"-Iexternal/eigenRepo",
],
deps = [
"@eigenRepo//:eigen",
"@libiglRepo//:libigl",
"@geometryCentralRepo//:geoCentral",
"@openCVRepo//:opencv_core",
"@openCVRepo//:opencv_imgcodecs",
"@spdlogRepo//:spdlog",
"@libpngRepo//:libpng"
],
visibility = ["//visibility:public"],
)
最后，這些是所有依賴項：
本征：
load("@rules_cc//cc:defs.bzl", "cc_library")
cc_library(
name = "eigen",
hdrs = glob(["Eigen/**", "unsupported/**"]),
copts = ["-w", "-O3", "-pthread"],
visibility = ["//visibility:public"],
)
libigl:
load("@rules_cc//cc:defs.bzl", "cc_library")
cc_library(
name = "libigl",
hdrs = glob(["**/*.h*", "**/*.c*"]),
copts = ["-w", "-O3", "-pthread"],
visibility = ["//visibility:public"],
)
地理中心：
load("@rules_cc//cc:defs.bzl", "cc_library")
cc_library(
name = "geoCentral",
srcs = glob(["src/**/*.cpp"],
exclude=["src/utilities/unit_vector3.cpp", "src/surface/mesh_ray_tracer.cpp", "src/surface/detect_symmetry.cpp"]),
hdrs = glob(["**/*.h", "**/*.ipp"]),
copts = [
"-w",
"-O3",
"-pthread",
"-Iexternal/geometryCentralRepo/include",
"-Iexternal/geometryCentralRepo/deps",
"-Iexternal/geometryCentralRepo/src",
"-Iexternal/geometryCentralRepo",
"-Iexternal/geometryCentralRepo/deps/nanort/include",
"-Iexternal/geometryCentralRepo/deps/happly",
"-Iexternal/eigenRepo",
"-Iexternal/nanoflann",
"-Iexternal",
"-Iexternal/happlyRepo/"],
deps = ["@eigenRepo//:eigen", "@nanoflann//:nanoflann", "@happlyRepo//:happly"],
visibility = ["//visibility:public"],
)
openCV：
load("@rules_cc//cc:defs.bzl", "cc_library")
package(default_visibility = ["//visibility:private"])
cc_library(
name = "opencv_core",
srcs = glob([
"modules/core/src/**/*.cpp",
"modules/core/src/**/*.hpp",
"modules/core/include/**/*.hpp",
"modules/core/include/**/*.h",
]) + [
"custom_hal.hpp",
"cvconfig.h",
"opencl_kernels_core.hpp",
"opencv2/opencv_modules.hpp",
"version_string.inc",
],
hdrs = ["modules/core/include/opencv2/core/opencl/ocl_defs.hpp"],
copts = [
"-D__OPENCV_BUILD",
"-Iexternal/zlib",
],
includes = [
".",
"modules/core/include",
],
linkopts = [
"-ldl",
] + select({
":arm": ["-llog"],
"//conditions:default": ["-lpthread"],
}),
visibility = ["//visibility:public"],
deps = [
"@zlibRepo//:zlib",
],
)
genrule(
name = "opencv_core_kernels",
outs = ["opencl_kernels_core.hpp"],
cmd = """
echo '#include "opencv2/core/ocl.hpp"' > $@
echo '#include "opencv2/core/ocl_genbase.hpp"' > $@
echo '#include "opencv2/core/opencl/ocl_defs.hpp"' > $@
""",
)
genrule(
name = "cvconfig",
srcs = select({
":arm": ["cvconfig_android.h"],
"//conditions:default": ["cvconfig_linux.h"],
}),
outs = ["cvconfig.h"],
cmd = "cp $< $@",
)
genrule(
name = "cvconfig_linux",
outs = ["cvconfig_linux.h"],
cmd = """
echo '#define HAVE_PNG' >> $@
""",
)
genrule(
name = "cvconfig_android",
outs = ["cvconfig_android.h"],
cmd = """
echo '#define HAVE_PNG' >> $@
echo '#define ANDROID' >> $@
""",
)
genrule(
name = "custom_hal",
outs = ["custom_hal.hpp"],
cmd = "touch $@",
)
genrule(
name = "version_string",
outs = ["version_string.inc"],
cmd = "echo '\"OpenCV 3.1.0\"' > $@",
)
genrule(
name = "opencv_modules",
outs = ["opencv2/opencv_modules.hpp"],
cmd = """
echo '#define HAVE_OPENCV_CORE' >> $@
echo '#define HAVE_OPENCV_IMGCODECS' >> $@
echo '#define HAVE_OPENCV_IMGPROC' >> $@
echo '#define HAVE_OPENCV_ML' >> $@
echo '#define HAVE_OPENCV_VIDEOIO' >> $@
""",
)
cc_library(
name = "opencv_imgproc",
srcs = glob([
"modules/imgproc/src/**/*.cpp",
"modules/imgproc/src/**/*.hpp",
"modules/imgproc/src/**/*.h",
"modules/imgproc/include/**/*.hpp",
"modules/imgproc/include/**/*.h",
]) + ["opencl_kernels_imgproc.hpp"],
copts = ["-D__OPENCV_BUILD"],
includes = [
".",
"modules/core/include",
"modules/imgproc/include",
],
visibility = ["//visibility:public"],
deps = [":opencv_core"],
)
genrule(
name = "opencv_imgproc_kernels",
outs = ["opencl_kernels_imgproc.hpp"],
cmd = """
echo '#include "opencv2/core/ocl.hpp"' > $@
echo '#include "opencv2/core/ocl_genbase.hpp"' > $@
echo '#include "opencv2/core/opencl/ocl_defs.hpp"' > $@
""",
)
cc_library(
name = "opencv_ml",
srcs = glob([
"modules/ml/src/**/*.cpp",
"modules/ml/src/**/*.hpp",
"modules/ml/include/**/*.hpp",
]),
copts = ["-D__OPENCV_BUILD"],
includes = ["modules/ml/include"],
visibility = ["//visibility:public"],
deps = [":opencv_core"],
)
cc_library(
name = "opencv_imgcodecs",
srcs = glob([
"modules/imgcodecs/src/**/*.cpp",
"modules/imgcodecs/src/**/*.hpp",
"modules/imgcodecs/include/**/*.hpp",
"modules/imgcodecs/include/**/*.h",
]),
copts = [
"-D__OPENCV_BUILD",
"-Iexternal/libpng_http",
"-Iexternal/libpng",
"-Iexternal/zlib",
],
includes = [
"modules/imgcodecs/include",
],
visibility = ["//visibility:public"],
deps = [
":opencv_core",
":opencv_imgproc",
"@libpngRepo//:libpng",
"@zlibRepo//:zlib",
],
)
spd日志：
load("@rules_cc//cc:defs.bzl", "cc_library")
cc_library(
name = "spdlog",
hdrs = glob(["include/**/*.h"]),
includes = ["include"],
visibility = ["//visibility:public"],
)
libpng:
load("@rules_cc//cc:defs.bzl", "cc_library")
cc_library(
name = "libpng",
srcs = glob(["*.c"]),
hdrs = glob(["*.h"]),
copts = [
"-w",
"-O3",
"-pthread",
"-Iexternal",
],
includes = [
".",
],
linkopts = [
"-lpng",
"-lz",
],
visibility = ["//visibility:public"],
deps = [
"@zlibRepo//:zlib",
],
)
z庫：
load("@rules_cc//cc:defs.bzl", "cc_library")
cc_library(
name = "zlib",
srcs = glob(["*.cpp"]),
hdrs = glob(["*.h"]),
copts = [
"-w",
"-O3",
"-pthread",
"-Iexternal",
],
visibility = ["//visibility:public"],
)
我收到一堆包含錯誤，例如：致命錯誤：找不到“pnglibconf.h”文件
據我所知，這是一個 linker 問題，其中“pnglibconf.h”應該由編譯器創建並編譯成 linker 應該能夠鏈接的庫。
特別奇怪的是，“:myAPI”是唯一的依賴項，它可以使用 g++ 正確編譯，所以一定是設置正確的鏈接選項的問題？
任何幫助將不勝感激！
謝謝，
1 個解決方案
解決方案1
1 2021-09-29 19:32:39
我終於找到了解決方案：
毫不奇怪，存在不止一個問題，包括以下內容：
在編譯與我正在使用的 openCV 3.1.0 一起提供的 libpng 版本時，Emscripten 不喜歡 c++2a 標准。 因此，我最終使用 g++ 使用
-std=c++2a進行編譯，而在使用 emcc (emscripten) 進行編譯時沒有使用它。類似的情況也適用於 linker 選項，其中 g++ 需要
-lpng -lz（按此順序），而 emcc 不需要任何東西。此外，emscripten 在編譯 zlib 時需要一個 linker 標志（在我的情況下這是一個依賴項）：
-s USE_ZLIB=1。
我希望這會有所幫助，也祝你的項目好運......
為什么這個代碼無法用gcc 4.8.5編譯，而它用clang編譯好
[英]Why this code fails to compile with gcc 4.8.5 while it compiles fine with clang
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