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cygwin - 如何使用 mingw32 在 cygwin 下构建和测试 libffi?

转载 作者:行者123 更新时间:2023-12-02 06:05:02 25 4
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检查(最新)标签 v3.2.1 后:

% sh autogen.sh
% ./configure CC=i686-pc-mingw32-gcc
% make check

所有测试似乎都失败了。

使用 CC=gcc,测试似乎工作正常。不幸的是,我需要生成的构建没有 cygwin 依赖项,因为我正在构建 JNI DLL。

最佳答案

我尝试使用 MSYS2 环境和 mingw-w64 构建 libffi,但我遇到了同样的问题:

a) 当我运行 make check

时,所有测试似乎都失败了

b) 当我尝试使用 -lffi 编译 libffi Hello World 示例时, 链接器提示对所有 ffi 相关符号的未解析引用(这些符号确实包含在 libffi.a 中,但可能由于循环依赖和目标文件的顺序,链接器无法收集所有符号)

幸运的是,如果我删除 -lffi 并转而包含 libffi 创建的所有目标文件 (*.o) make 操作,创建的可执行文件运行得很好。

这是我使用的 libffi Hello World 示例的链接: http://www.chiark.greenend.org.uk/doc/libffi-dev/html/Closure-Example.html

[编辑]

经过一些额外的实验,我成功地通过用 -Wl,--whole-archive,-lffi,--no-whole- 替换 -lffi 来编译程序存档。这样,链接器将包含来自 libffi.a 的所有目标文件,并且一切都会正常工作。

这是Hello World示例(hello.c),其中包含我使用的详细步骤,以防有人发现此信息有用:

/*
* Steps for building libffi on Windows and running this Hello World example:
*
* 1. Download and install the latest version of MSYS2
* a) download the latest (64-bit or 32-bit) installer from http://msys2.github.io
* b) run the installer accepting default settings
* c) execute the following commands to update the system core
* pacman -Sy pacman
* pacman -Syu
* pacman -Su
* d) restart MSYS2, if requested to do so
* e) execute the following command to install development tools
* for 64-bit gcc:
* pacman --needed -S base-devel dejagnu mingw-w64-x86_64-gcc
* for 32-bit gcc:
* pacman --needed -S base-devel dejagnu mingw-w64-i686-gcc
* f) restart MSYS2
* 2. Download and compile the latest version of libffi
* a) download the latest source code bundle from https://github.com/libffi/libffi/releases
* b) unpack the source code bundle in MSYS2 tmp directory (e.g. C:\msys64\tmp)
* c) execute the following MSYS2 commands to compile libffi (adapt the version number):
* cd /tmp/libffi-3.2.1
* ./autogen.sh
* ./configure --prefix=/tmp/out --enable-static --disable-shared
* make
* d) optionally, execute the following command to run the tests:
* make check
* e) copy the distributable files to the configured /tmp/out directory
* make install
* the following files are needed for the next step:
* /tmp/out/lib/libffi.a
* /tmp/out/lib/libffi-3.2.1/include/ffi.h
* /tmp/out/lib/libffi-3.2.1/include/ffitarget.h
* 3. Compile this example
* a) copy this file to MSYS2 tmp directory (e.g. C:\msys64\tmp\hello.c)
* b) execute the following MSYS2 command to compile the example:
* gcc -I /tmp/out/lib/libffi-3.2.1/include -L /tmp/out/lib -lffi -o /tmp/hello /tmp/hello.c
* c) run the example (/tmp/hello.exe), the output should be:
* Hello World!
*
* Troubleshooting
*
* If the tests seem to fail and the compilation in step 3b) above reports undefined references to 'ffi_*' symbols,
* try compiling using the following command instead:
* gcc -I /tmp/out/lib/libffi-3.2.1/include -L /tmp/out/lib -Wl,--whole-archive,-lffi,--no-whole-archive -o /tmp/hello /tmp/hello.c
* Another alternative is to try linking the original libffi object files (*.o) and drop -lffi as follows:
* For 64-bit version:
* export SRC=/tmp/libffi-3.2.1/x86_64-w64-mingw32/src
* gcc -I /tmp/out/lib/libffi-3.2.1/include -o /tmp/hello /tmp/hello.c $SRC/prep_cif.o $SRC/types.o $SRC/raw_api.o $SRC/java_raw_api.o $SRC/closures.o $SRC/x86/ffi.o $SRC/x86/win64.o
* For 32-bit version:
* export SRC=/tmp/libffi-3.2.1/i686-w64-mingw32/src
* gcc -I /tmp/out/lib/libffi-3.2.1/include -o /tmp/hello /tmp/hello.c $SRC/prep_cif.o $SRC/types.o $SRC/raw_api.o $SRC/java_raw_api.o $SRC/closures.o $SRC/x86/ffi.o $SRC/x86/win32.o
*/

#include <stdio.h>
#include <ffi.h>

/* Acts like puts with the file given at time of enclosure */
void puts_binding(ffi_cif* cif, void* ret, void* args[], void* stream) {
*(ffi_arg*) ret = fputs(*(char**) args[0], (FILE*) stream);
}

typedef int (*puts_t)(char*);

int main() {
ffi_cif cif; /* The call interface */
ffi_type* args[1]; /* The array of pointers to function argument types */
ffi_closure* closure; /* The allocated closure writable address */
void* bound_puts; /* The allocated closure executable address */
int rc; /* The function invocation return code */

/* Allocate closure (writable address) and bound_puts (executable address) */
closure = ffi_closure_alloc(sizeof(ffi_closure), &bound_puts);

if (closure) {
/* Initialize the array of pointers to function argument types */
args[0] = &ffi_type_pointer;

/* Initialize the call interface describing the function prototype */
if (ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1, &ffi_type_sint, args) == FFI_OK) {
/* Initialize the closure, setting stream to stdout */
if (ffi_prep_closure_loc(closure, &cif, puts_binding, stdout, bound_puts) == FFI_OK) {
rc = ((puts_t) bound_puts)("Hello World!");
/* rc now holds the result of the call to fputs */
}
}
}

/* Deallocate both closure, and bound_puts */
ffi_closure_free(closure);

return 0;
}

关于cygwin - 如何使用 mingw32 在 cygwin 下构建和测试 libffi?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31643262/

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