bazel icon indicating copy to clipboard operation
bazel copied to clipboard

Update LibrariesToLinkCollector.java for .dll suffix stripping

Open vvviktor opened this issue 1 year ago • 0 comments

Fixes #19696

Allow automatic linkage of DLL libraries when GNU toolchain used in Windows. .dll suffix has to be stripped before passing library name to ld.exe with -l option.

This case was successfully tested :

Workspace structure:

D:.
│   .bazelrc
│   BUILD
│   MODULE.bazel
│   MODULE.bazel.lock
│   WORKSPACE
│
├───Main
│       BUILD
│       main.cpp
│       math.cpp
│       math.h
│       math_dll_interface.cpp
│       math_dll_interface.h
│       math_import_defs.h
│
└───toolchain
        BUILD
        toolchain_config.bzl

BUILD file:

# //Main/BUILD

DLL_HDRS = ["math_import_defs.h", "math_dll_interface.h"]

cc_binary(
    name = "sum_numbers_mingw",
    srcs = ["main.cpp"],
    deps = [":math_d_shared"]
)

cc_import(
    name = "math_d_shared",
    hdrs = DLL_HDRS,
    shared_library = ":libmath_d.dll"
)

cc_binary(
    name = "libmath_d.dll",
    srcs = ["math_dll_interface.cpp"] + DLL_HDRS,
    deps = [":math"],
    defines = ["MATH_DLL"],
    linkshared = 1
)

cc_library(
    name = "math",
    srcs = ["math.cpp"],
    hdrs = ["math.h"],
    copts = ["-std=c++17"]
)

Without patch applied bazel build //main:sum_numbers_mingw --verbose_failures fails with error: C:/msys64/ucrt64/bin/../lib/gcc/x86_64-w64-mingw32/13.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lmath_d.dll: No such file or directory Then after patch was applied it builds all targets as expected.

This approach also works fine with patch applied:

# //Main/BUILD

DLL_HDRS = ["math_import_defs.h", "math_dll_interface.h"]

cc_binary(
    name = "sum_numbers_mingw",
    srcs = ["main.cpp"] + DLL_HDRS,
    dynamic_deps = [":math_d_shared"]
)

cc_shared_library(
    name = "math_d_shared",
    shared_lib_name = "libmath_d.dll",
    deps = [":math_dll_interface"]
)

cc_library(
    name = "math_dll_interface",
    srcs = ["math_dll_interface.cpp"],
    hdrs = DLL_HDRS,
    deps = [":math"],
    defines = ["MATH_DLL"]
)

cc_library(
    name = "math",
    srcs = ["math.cpp"],
    hdrs = ["math.h"],
    copts = ["-std=c++17"]
)

vvviktor avatar Feb 19 '24 00:02 vvviktor