LibC: Modernize and simplify LibC/CMakeLists.txt

Author: https://github.com/DanShaders
Commit: e3e98ed3eb
Pull-request: https://github.com/SerenityOS/serenity/pull/24129
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/supercomputer7

Userland/Libraries/LibC/CMakeLists.txt

@@ -1,4 +1,6 @@
-set(LIBC_SOURCES
+set(SOURCES
+    arch/${SERENITY_ARCH}/fenv.cpp
+    arch/${SERENITY_ARCH}/setjmp.S
     arpa/inet.cpp
     assert.cpp
     ctype.cpp
@@ -76,15 +78,152 @@ set(LIBC_SOURCES
     wchar.cpp
     wctype.cpp
     wstdio.cpp
+
+    ${AK_SOURCES}
 )
 
-file(GLOB_RECURSE LIBC_HEADERS RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" CONFIGURE_DEPENDS "*.h")
-list(APPEND LIBC_HEADERS "../LibELF/ELFABI.h" "../LibRegex/RegexDefs.h")
+if (SERENITY_ARCH STREQUAL "x86_64")
+    list(APPEND SOURCES
+        arch/x86_64/memset.cpp
+        arch/x86_64/memset.S
+    )
+endif()
 
+# FIXME: This, ideally, should be an exhaustive list of headers (transitively) used by libc's own
+#        headers. (Like, for example, we shouldn't include AK/Platform.h in them for no reason at
+#        all.)
+set(HEADERS
+    arch/${SERENITY_ARCH}/fenv.h
+    arch/fenv.h
+    arpa/inet.h
+    bits/dlfcn_integration.h
+    bits/FILE.h
+    bits/getopt.h
+    bits/mutex_locker.h
+    bits/posix1_lim.h
+    bits/pthread_cancel.h
+    bits/pthread_integration.h
+    bits/search.h
+    bits/sighow.h
+    bits/stdint.h
+    bits/stdio_file_implementation.h
+    bits/utimens.h
+    bits/wchar.h
+    bits/wchar_size.h
+    net/if.h
+    net/if_arp.h
+    net/route.h
+    netinet/if_ether.h
+    netinet/in.h
+    netinet/in_systm.h
+    netinet/ip.h
+    netinet/ip_icmp.h
+    netinet/tcp.h
+    sys/arch/${SERENITY_ARCH}/regs.h
+    sys/arch/regs.h
+    sys/archctl.h
+    sys/auxv.h
+    sys/cdefs.h
+    sys/device.h
+    sys/devices/gpu.h
+    sys/file.h
+    sys/internals.h
+    sys/ioctl.h
+    sys/mman.h
+    sys/param.h
+    sys/poll.h
+    sys/prctl.h
+    sys/ptrace.h
+    sys/resource.h
+    sys/select.h
+    sys/socket.h
+    sys/stat.h
+    sys/statvfs.h
+    sys/sysmacros.h
+    sys/time.h
+    sys/times.h
+    sys/ttydefaults.h
+    sys/types.h
+    sys/uio.h
+    sys/un.h
+    sys/utsname.h
+    sys/wait.h
+    alloca.h
+    assert.h
+    byteswap.h
+    complex.h
+    ctype.h
+    dirent.h
+    dlfcn.h
+    elf.h
+    endian.h
+    errno_codes.h
+    errno.h
+    fcntl.h
+    fd_set.h
+    fenv.h
+    float.h
+    fnmatch.h
+    getopt.h
+    glob.h
+    grp.h
+    ifaddrs.h
+    inttypes.h
+    langinfo.h
+    libgen.h
+    limits.h
+    link.h
+    locale.h
+    mallocdefs.h
+    math.h
+    memory.h
+    mntent.h
+    netdb.h
+    nl_types.h
+    paths.h
+    poll.h
+    pthread.h
+    pty.h
+    pwd.h
+    regex.h
+    resolv.h
+    sched.h
+    search.h
+    semaphore.h
+    serenity.h
+    setjmp.h
+    shadow.h
+    signal.h
+    spawn.h
+    stdarg.h
+    stdint.h
+    stdio_ext.h
+    stdio.h
+    stdlib.h
+    string.h
+    strings.h
+    sysexits.h
+    syslog.h
+    termcap.h
+    termios.h
+    time.h
+    ucontext.h
+    ulimit.h
+    unistd.h
+    utime.h
+    utmp.h
+    wchar.h
+    wctype.h
+
+    ../LibELF/ELFABI.h
+    ../LibRegex/RegexDefs.h
+)
+
+# ===== LibC headers =====
 add_custom_target(install_libc_headers)
 
 # Copy LibC's headers into the sysroot to satisfy libc++'s include priority requirements.
-foreach(RELATIVE_HEADER_PATH IN LISTS LIBC_HEADERS)
+foreach(RELATIVE_HEADER_PATH IN LISTS HEADERS)
     get_filename_component(directory ${RELATIVE_HEADER_PATH} DIRECTORY)
     string(REPLACE "../" "" subdirectory "${directory}")
     file(MAKE_DIRECTORY "${CMAKE_STAGING_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}/${subdirectory}")
@@ -97,28 +236,9 @@ foreach(RELATIVE_HEADER_PATH IN LISTS LIBC_HEADERS)
     )
 endforeach()
 
-if ("${SERENITY_ARCH}" STREQUAL "aarch64")
-    set(LIBC_SOURCES ${LIBC_SOURCES} "arch/aarch64/fenv.cpp")
-    set(ASM_SOURCES "arch/aarch64/setjmp.S")
-    set(CRTI_SOURCE "arch/aarch64/crti.S")
-    set(CRTN_SOURCE "arch/aarch64/crtn.S")
-elseif ("${SERENITY_ARCH}" STREQUAL "x86_64")
-    set(LIBC_SOURCES ${LIBC_SOURCES} "arch/x86_64/memset.cpp" "arch/x86_64/fenv.cpp")
-    set(ASM_SOURCES "arch/x86_64/setjmp.S" "arch/x86_64/memset.S")
-    set(CRTI_SOURCE "arch/x86_64/crti.S")
-    set(CRTN_SOURCE "arch/x86_64/crtn.S")
-elseif ("${SERENITY_ARCH}" STREQUAL "riscv64")
-    set(LIBC_SOURCES ${LIBC_SOURCES} "arch/riscv64/fenv.cpp")
-    set(ASM_SOURCES "arch/riscv64/setjmp.S")
-    set(CRTI_SOURCE "arch/riscv64/crti.S")
-    set(CRTN_SOURCE "arch/riscv64/crtn.S")
-endif()
-
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option")
-
-# Note: We link all these against NoCoverage so that we don't break ports by requiring coverage symbols
-# in runtime/startup objects.
-
+# ===== Start files =====
+# NOTE: We link all these against NoCoverage so that we don't break ports by requiring coverage
+#       symbols in runtime/startup objects.
 add_library(crt0 STATIC crt0.cpp)
 add_dependencies(crt0 install_libc_headers)
 target_link_libraries(crt0 PRIVATE NoCoverage)
@@ -126,6 +246,7 @@ add_custom_command(
     TARGET crt0
     COMMAND "${CMAKE_COMMAND}" -E copy $<TARGET_OBJECTS:crt0> ${CMAKE_INSTALL_PREFIX}/usr/lib/crt0.o
 )
+
 add_library(crt0_shared STATIC crt0_shared.cpp)
 add_dependencies(crt0_shared install_libc_headers)
 target_link_libraries(crt0_shared PRIVATE NoCoverage)
@@ -134,36 +255,35 @@ add_custom_command(
     COMMAND "${CMAKE_COMMAND}" -E copy $<TARGET_OBJECTS:crt0_shared> ${CMAKE_INSTALL_PREFIX}/usr/lib/crt0_shared.o
 )
 
-add_library(crti STATIC ${CRTI_SOURCE})
+add_library(crti STATIC arch/${SERENITY_ARCH}/crti.S)
 target_link_libraries(crti PRIVATE NoCoverage)
 add_custom_command(
     TARGET crti
     COMMAND "${CMAKE_COMMAND}" -E copy $<TARGET_OBJECTS:crti> ${CMAKE_INSTALL_PREFIX}/usr/lib/crti.o
 )
 
-add_library(crtn STATIC ${CRTN_SOURCE})
+add_library(crtn STATIC arch/${SERENITY_ARCH}/crtn.S)
 target_link_libraries(crtn PRIVATE NoCoverage)
 add_custom_command(
     TARGET crtn
     COMMAND "${CMAKE_COMMAND}" -E copy $<TARGET_OBJECTS:crtn> ${CMAKE_INSTALL_PREFIX}/usr/lib/crtn.o
 )
 
-set(SOURCES ${LIBC_SOURCES} ${AK_SOURCES} ${ASM_SOURCES})
-
+# ===== LibC =====
 # Prevent GCC from removing null checks by marking the `FILE*` argument non-null
 set_source_files_properties(stdio.cpp PROPERTIES COMPILE_FLAGS "-fno-builtin-fputc -fno-builtin-fputs -fno-builtin-fwrite")
 
 # Prevent naively implemented string functions (like strlen) from being "optimized" into a call to themselves.
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     set_source_files_properties(string.cpp wchar.cpp PROPERTIES COMPILE_FLAGS "-fno-tree-loop-distribution -fno-tree-loop-distribute-patterns")
+else()
+    set_source_files_properties(string.cpp wchar.cpp PROPERTIES COMPILE_FLAGS "-fno-builtin")
 endif()
 
-set_source_files_properties(ssp.cpp PROPERTIES COMPILE_FLAGS "-fno-stack-protector")
-
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nolibc")
 serenity_libc(LibC c)
 add_dependencies(LibC crti crt0 crt0_shared crtn install_libc_headers)
 target_link_libraries(LibC PRIVATE LibSystem LibTimeZone)
+target_link_options(LibC PRIVATE -nolibc)
 
 # Provide a linker script instead of various other libraries that tells everything to link against LibC.
 file(WRITE "${CMAKE_STAGING_PREFIX}/${CMAKE_INSTALL_LIBDIR}/libpthread.so" "INPUT(libc.so)")

Userland/Libraries/LibC/ssp.cpp

@@ -11,18 +11,10 @@
 #include <sys/internals.h>
 #include <unistd.h>
 
-#if defined __SSP__ || defined __SSP_ALL__
-#    error "file must not be compiled with stack protection enabled on it. Use -fno-stack-protector"
-#endif
-
-extern "C" {
-
-__attribute__((noreturn)) void __stack_chk_fail()
+extern "C" [[gnu::noreturn, gnu::no_stack_protector]] void __stack_chk_fail()
 {
     dbgln("Error: USERSPACE({}) Stack protector failure, stack smashing detected!", getpid());
     if (__stdio_is_initialized)
         warnln("Error: Stack protector failure, stack smashing detected!");
     abort();
 }
-
-} // extern "C"