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plugins: enable linking with clang/lld

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Windows uses a special mechanism to enable plugins to work (DLL delay
loading). Option for lld is different than ld.

MSYS2 clang based environment use lld by default, so restricting to this
config on Windows is safe, and will avoid false bug reports.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Tested-by: Stefan Weil <sw@weilnetz.de>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20250110203401.178532-4-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250116160306.1709518-26-alex.bennee@linaro.org>
This commit is contained in:
Pierrick Bouvier 2025-01-16 16:02:54 +00:00 • committed by Alex Bennée
parent ecbf3567e2
commit 923710b6d5
4 changed files with 27 additions and 7 deletions
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24
plugins/meson.build
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@ -17,14 +17,15 @@ if not enable_modules
capture: true,
command: ['sed', '-ne', 's/^[[:space:]]*\\(qemu_.*\\);/_\\1/p', '@INPUT@'])
emulator_link_args += ['-Wl,-exported_symbols_list,plugins/qemu-plugins-ld64.symbols']
elif host_os == 'windows' and meson.get_compiler('c').get_id() == 'clang'
# LLVM/lld does not support exporting specific symbols. However, it works
# out of the box with dllexport/dllimport attribute we set in the code.
else
emulator_link_args += ['-Xlinker', '--dynamic-list=' + qemu_plugin_symbols.full_path()]
endif
endif
if host_os == 'windows'
dlltool = find_program('dlltool', required: true)
# Generate a .lib file for plugins to link against.
# First, create a .def file listing all the symbols a plugin should expect to have
# available in qemu
@ -33,12 +34,27 @@ if host_os == 'windows'
output: 'qemu_plugin_api.def',
capture: true,
command: ['sed', '-e', '0,/^/s//EXPORTS/; s/[{};]//g', '@INPUT@'])
# then use dlltool to assemble a delaylib.
# The delaylib will have an "imaginary" name (qemu.exe), that is used by the
# linker file we add with plugins (win32_linker.c) to identify that we want
# to find missing symbols in current program.
win32_qemu_plugin_api_link_flags = ['-Lplugins', '-lqemu_plugin_api']
if meson.get_compiler('c').get_id() == 'clang'
# With LLVM/lld, delaylib is specified at link time (-delayload)
dlltool = find_program('llvm-dlltool', required: true)
dlltool_cmd = [dlltool, '-d', '@INPUT@', '-l', '@OUTPUT@', '-D', 'qemu.exe']
win32_qemu_plugin_api_link_flags += ['-Wl,-delayload=qemu.exe']
else
# With gcc/ld, delay lib is built with a specific delay parameter.
dlltool = find_program('dlltool', required: true)
dlltool_cmd = [dlltool, '--input-def', '@INPUT@',
'--output-delaylib', '@OUTPUT@', '--dllname', 'qemu.exe']
endif
win32_qemu_plugin_api_lib = configure_file(
input: win32_plugin_def,
output: 'libqemu_plugin_api.a',
command: [dlltool, '--input-def', '@INPUT@',
'--output-delaylib', '@OUTPUT@', '--dllname', 'qemu.exe']
command: dlltool_cmd
)
endif
specific_ss.add(files(