AK+Userland: Replace Linux, macOS, and *BSD macros with platform defines

We have such nice platform macros, let's clean up any remnants of manual
__my_platform__ macros in LibCore, LibCompress and AK.

AK/StackInfo.cpp

@@ -12,9 +12,9 @@
 
 #ifdef AK_OS_SERENITY
 #    include <serenity.h>
-#elif defined(__linux__) or defined(AK_OS_MACOS)
+#elif defined(AK_OS_LINUX) or defined(AK_OS_MACOS)
 #    include <pthread.h>
-#elif defined(__FreeBSD__)
+#elif defined(AK_OS_FREEBSD)
 #    include <pthread.h>
 #    include <pthread_np.h>
 #endif
@@ -28,12 +28,12 @@ StackInfo::StackInfo()
         perror("get_stack_bounds");
         VERIFY_NOT_REACHED();
     }
-#elif defined(__linux__) or defined(__FreeBSD__)
+#elif defined(AK_OS_LINUX) or defined(AK_OS_FREEBSD)
     int rc;
     pthread_attr_t attr;
     pthread_attr_init(&attr);
 
-#    ifdef __linux__
+#    ifdef AK_OS_LINUX
     if ((rc = pthread_getattr_np(pthread_self(), &attr)) != 0) {
         fprintf(stderr, "pthread_getattr_np: %s\n", strerror(rc));
         VERIFY_NOT_REACHED();

Userland/Libraries/LibCompress/BrotliDictionary.cpp

@@ -9,7 +9,7 @@
 
 // Include the 119.9 KiB of dictionary data from a binary file
 extern u8 const brotli_dictionary_data[];
-#if defined(__APPLE__)
+#if defined(AK_OS_MACOS)
 asm(".const_data\n"
     ".globl _brotli_dictionary_data\n"
     "_brotli_dictionary_data:\n");

Userland/Libraries/LibCore/File.cpp

@@ -22,7 +22,7 @@
 #endif
 
 // On Linux distros that use glibc `basename` is defined as a macro that expands to `__xpg_basename`, so we undefine it
-#if defined(__linux__) && defined(basename)
+#if defined(AK_OS_LINUX) && defined(basename)
 #    undef basename
 #endif
 

Userland/Libraries/LibCore/Stream.cpp

@@ -17,7 +17,7 @@
 #ifdef AK_OS_SERENITY
 #    include <serenity.h>
 #endif
-#ifdef __FreeBSD__
+#ifdef AK_OS_FREEBSD
 #    include <sys/ucred.h>
 #endif
 
@@ -655,10 +655,10 @@ ErrorOr<pid_t> LocalSocket::peer_pid() const
 #ifdef AK_OS_MACOS
     pid_t pid;
     socklen_t pid_size = sizeof(pid);
-#elif defined(__FreeBSD__)
+#elif defined(AK_OS_FREEBSD)
     struct xucred creds = {};
     socklen_t creds_size = sizeof(creds);
-#elif defined(__OpenBSD__)
+#elif defined(AK_OS_OPENBSD)
     struct sockpeercred creds = {};
     socklen_t creds_size = sizeof(creds);
 #else
@@ -669,7 +669,7 @@ ErrorOr<pid_t> LocalSocket::peer_pid() const
 #ifdef AK_OS_MACOS
     TRY(System::getsockopt(m_helper.fd(), SOL_LOCAL, LOCAL_PEERPID, &pid, &pid_size));
     return pid;
-#elif defined(__FreeBSD__)
+#elif defined(AK_OS_FREEBSD)
     TRY(System::getsockopt(m_helper.fd(), SOL_LOCAL, LOCAL_PEERCRED, &creds, &creds_size));
     return creds.cr_pid;
 #else

Userland/Libraries/LibCore/System.cpp

@@ -31,7 +31,7 @@
 #    include <serenity.h>
 #endif
 
-#if defined(__linux__) && !defined(MFD_CLOEXEC)
+#if defined(AK_OS_LINUX) && !defined(MFD_CLOEXEC)
 #    include <linux/memfd.h>
 #    include <sys/syscall.h>
 
@@ -41,7 +41,7 @@ static int memfd_create(char const* name, unsigned int flags)
 }
 #endif
 
-#if defined(__APPLE__)
+#if defined(AK_OS_MACOS)
 #    include <sys/mman.h>
 #endif
 
@@ -54,7 +54,7 @@ static int memfd_create(char const* name, unsigned int flags)
 namespace Core::System {
 
 #ifndef HOST_NAME_MAX
-#    ifdef __APPLE__
+#    ifdef AK_OS_MACOS
 #        define HOST_NAME_MAX 255
 #    else
 #        define HOST_NAME_MAX 64
@@ -222,7 +222,7 @@ ErrorOr<void> sigaction(int signal, struct sigaction const* action, struct sigac
     return {};
 }
 
-#if defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+#if defined(AK_OS_MACOS) || defined(AK_OS_OPENBSD) || defined(AK_OS_FREEBSD)
 ErrorOr<sig_t> signal(int signal, sig_t handler)
 #else
 ErrorOr<sighandler_t> signal(int signal, sighandler_t handler)
@@ -284,7 +284,7 @@ ErrorOr<int> anon_create([[maybe_unused]] size_t size, [[maybe_unused]] int opti
     int fd = -1;
 #if defined(AK_OS_SERENITY)
     fd = ::anon_create(round_up_to_power_of_two(size, PAGE_SIZE), options);
-#elif defined(__linux__) || defined(__FreeBSD__)
+#elif defined(AK_OS_LINUX) || defined(AK_OS_FREEBSD)
     // FIXME: Support more options on Linux.
     auto linux_options = ((options & O_CLOEXEC) > 0) ? MFD_CLOEXEC : 0;
     fd = memfd_create("", linux_options);
@@ -295,7 +295,7 @@ ErrorOr<int> anon_create([[maybe_unused]] size_t size, [[maybe_unused]] int opti
         TRY(close(fd));
         return Error::from_errno(saved_errno);
     }
-#elif defined(__APPLE__)
+#elif defined(AK_OS_MACOS)
     struct timespec time;
     clock_gettime(CLOCK_REALTIME, &time);
     auto name = String::formatted("/shm-{}{}", (unsigned long)time.tv_sec, (unsigned long)time.tv_nsec);
@@ -1033,7 +1033,7 @@ ErrorOr<void> exec(StringView filename, Span<StringView> arguments, SearchInPath
         envp[environment->size()] = nullptr;
 
         if (search_in_path == SearchInPath::Yes && !filename.contains('/')) {
-#    if defined(__APPLE__) || defined(__FreeBSD__)
+#    if defined(AK_OS_MACOS) || defined(AK_OS_FREEBSD)
             // These BSDs don't support execvpe(), so we'll have to manually search the PATH.
             ScopedValueRollback errno_rollback(errno);
 

Userland/Libraries/LibCore/System.h

@@ -87,7 +87,7 @@ ErrorOr<int> accept4(int sockfd, struct sockaddr*, socklen_t*, int flags);
 #endif
 
 ErrorOr<void> sigaction(int signal, struct sigaction const* action, struct sigaction* old_action);
-#if defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+#if defined(AK_OS_MACOS) || defined(AK_OS_OPENBSD) || defined(AK_OS_FREEBSD)
 ErrorOr<sig_t> signal(int signal, sig_t handler);
 #else
 ErrorOr<sighandler_t> signal(int signal, sighandler_t handler);