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LibC: Use our implementation of crti.o and crtn.o

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We have had these for quite a while, but we didn't compile them, and
used GCC's version instead. Clang does not come with these, so we have
to provide our own implementation.

Our implementation follows what `musl` and `FreeBSD` do, so this should
work fine, even if documentation can hardly be found for them.
This commit is contained in:
Daniel Bertalan 2021-07-12 20:37:38 +02:00 • committed by Andreas Kling
parent 7f2eb2f332
commit a88f7c99fe
8 changed files with 93 additions and 35 deletions
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18
Userland/Libraries/LibC/CMakeLists.txt
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@ -65,9 +65,13 @@ file(GLOB ELF_SOURCES CONFIGURE_DEPENDS "../LibELF/*.cpp")
if ("${SERENITY_ARCH}" STREQUAL "i686")
set(ASM_SOURCES "arch/i386/setjmp.S")
set(ELF_SOURCES ${ELF_SOURCES} ../LibELF/Arch/i386/entry.S ../LibELF/Arch/i386/plt_trampoline.S)
set(CRTI_SOURCE "arch/i386/crti.S")
set(CRTN_SOURCE "arch/i386/crtn.S")
elseif ("${SERENITY_ARCH}" STREQUAL "x86_64")
set(ASM_SOURCES "arch/x86_64/setjmp.S")
set(ELF_SOURCES ${ELF_SOURCES} ../LibELF/Arch/x86_64/entry.S ../LibELF/Arch/x86_64/plt_trampoline.S)
set(CRTI_SOURCE "arch/x86_64/crti.S")
set(CRTN_SOURCE "arch/x86_64/crtn.S")
endif()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option -DSERENITY_LIBC_BUILD")
@ -83,6 +87,18 @@ 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_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_custom_command(
TARGET crtn
COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_OBJECTS:crtn> ${CMAKE_INSTALL_PREFIX}/usr/lib/crtn.o
)
set_source_files_properties (ssp.cpp PROPERTIES COMPILE_FLAGS
"-fno-stack-protector")
add_library(ssp STATIC ssp.cpp)
@ -118,7 +134,7 @@ set_property(
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libstdc++")
serenity_libc(LibC c)
add_dependencies(LibC crt0 crt0_shared)
add_dependencies(LibC crti crt0 crt0_shared crtn)
target_link_libraries(LibC ssp system)
# We mark LibCStatic as a dependency of LibC because this triggers the build of the LibCStatic target