编译flycast时遇到的平台相关的问题

EMCA

编译flycast时发现很多函数龙架构的函数库里没有，例如sys_pipe、sys_read、sys_sendmsg、sys_close等，请问这些函数是不是只在x86平台有？龙架构上是否有能替代的函数？多谢了

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc: In member function ‘virtual bool google_breakpad::{anonymous}::CrashGenerationClientImpl::RequestDump(const void*, size_t)’:

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:53:9: error: ‘sys_pipe’ was not declared in this scope

if (sys_pipe(fds) < 0)

^~~~~~~~

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:53:9: note: suggested alternative: ‘sys_nerr’

if (sys_pipe(fds) < 0)

^~~~~~~~

sys_nerr

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:57:25: error: aggregate ‘google_breakpad::{anonymous}::CrashGenerationClientImpl::RequestDump(const void*, size_t)::kernel_iovec iov’ has incomplete type and cannot be defined

struct kernel_iovec iov;

^~~

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:61:26: error: variable ‘google_breakpad::{anonymous}::CrashGenerationClientImpl::RequestDump(const void*, size_t)::kernel_msghdr msg’ has initializer but incomplete type

struct kernel_msghdr msg = { 0 };

^~~

In file included from ./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:38:

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:75:32: error: ‘sys_sendmsg’ was not declared in this scope

ssize_t ret = HANDLE_EINTR(sys_sendmsg(server_fd_, &msg, 0));

^~~~~~~~~~~

./flycast/core/deps/breakpad/src/common/linux/eintr_wrapper.h:40:14: note: in definition of macro ‘HANDLE_EINTR’

__typeof__(x) eintr_wrapper_result; \

^

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:75:32: note: suggested alternative: ‘sendmsg’

ssize_t ret = HANDLE_EINTR(sys_sendmsg(server_fd_, &msg, 0));

^~~~~~~~~~~

./flycast/core/deps/breakpad/src/common/linux/eintr_wrapper.h:40:14: note: in definition of macro ‘HANDLE_EINTR’

__typeof__(x) eintr_wrapper_result; \

^

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:76:5: error: ‘sys_close’ was not declared in this scope

sys_close(fds[1]);

^~~~~~~~~

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:76:5: note: suggested alternative: ‘pclose’

sys_close(fds[1]);

^~~~~~~~~

pclose

In file included from ./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:39:

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:84:29: error: ‘sys_read’ was not declared in this scope

IGNORE_RET(HANDLE_EINTR(sys_read(fds[0], &b, 1)));

^~~~~~~~

./flycast/core/deps/breakpad/src/common/linux/ignore_ret.h:38:32: note: in definition of macro ‘IGNORE_RET’

#define IGNORE_RET(x) do { if (x) {} } while (0)

^

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:84:16: note: in expansion of macro ‘HANDLE_EINTR’

IGNORE_RET(HANDLE_EINTR(sys_read(fds[0], &b, 1)));

^~~~~~~~~~~~

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:84:29: note: suggested alternative: ‘sys_nerr’

IGNORE_RET(HANDLE_EINTR(sys_read(fds[0], &b, 1)));

^~~~~~~~

./flycast/core/deps/breakpad/src/common/linux/ignore_ret.h:38:32: note: in definition of macro ‘IGNORE_RET’

#define IGNORE_RET(x) do { if (x) {} } while (0)

^

./flycast/core/deps/breakpad/src/client/linux/crash_generation/crash_generation_client.cc:84:16: note: in expansion of macro ‘HANDLE_EINTR’

IGNORE_RET(HANDLE_EINTR(sys_read(fds[0], &b, 1)));

EMCA

发现低主频主机模拟器的代码都比较容易通过编译，高主频主机模拟器的代码里为了提升性能多少都有一些骚操作，FBNeo甚至直接用了x86汇编语言

shangyatsen

这些都是系统调用，看下是不是ifdef没支持loongarch

EMCA

shangyatsen cmake脚本里只有x86和ARM，没有loongarch，通过改脚本跳过一系列系统检测直接编译，然后得到这个结果，而且目前报出错来的都是deps目录下的第三方库

liudidi

EMCA 这里有一个breakpad的补丁，不知道还能不能用。https://groups.google.com/g/google-breakpad-dev/c/hedIXR6qk7E

Sunny

sys_*函数看起来像是lss(linux syscall support)中的函数，

https://chromium.googlesource.com/linux-syscall-support/+/refs/heads/main/linux_syscall_support.h

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