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[libc][libcxx] Support for building libc++ against LLVM libc (#99287)
Provide an option to build libc++ against LLVM libc and set the CMake compile and link options appropriately when the option is enabled.
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Original file line number | Diff line number | Diff line change |
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#=============================================================================== | ||
# Define targets for linking against the selected C library | ||
# | ||
# After including this file, the following targets are defined: | ||
# - libcxx-libc-headers: An interface target that allows getting access to the | ||
# headers of the selected C library. | ||
# - libcxx-libc-shared: A target representing the selected shared C library. | ||
# - libcxx-libc-static: A target representing the selected static C library. | ||
#=============================================================================== | ||
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# Link against a system-provided libc | ||
if (LIBCXX_LIBC STREQUAL "system") | ||
add_library(libcxx-libc-headers INTERFACE) | ||
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add_library(libcxx-libc-static INTERFACE) | ||
add_library(libcxx-libc-shared INTERFACE) | ||
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# Link against the in-tree LLVM libc | ||
elseif (LIBCXX_LIBC STREQUAL "llvm-libc") | ||
add_library(libcxx-libc-headers INTERFACE) | ||
target_link_libraries(libcxx-libc-headers INTERFACE libc-headers) | ||
if(CXX_SUPPORTS_NOSTDLIBINC_FLAG) | ||
target_compile_options(libcxx-libc-headers INTERFACE "-nostdlibinc") | ||
endif() | ||
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add_library(libcxx-libc-static INTERFACE) | ||
if (TARGET libc) | ||
target_link_libraries(libcxx-libc-static INTERFACE libc) | ||
endif() | ||
if (TARGET libm) | ||
target_link_libraries(libcxx-libc-static INTERFACE libm) | ||
endif() | ||
if (CXX_SUPPORTS_NOLIBC_FLAG) | ||
target_link_options(libcxx-libc-static INTERFACE "-nolibc") | ||
endif() | ||
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# TODO: There's no support for building LLVM libc as a shared library yet. | ||
add_library(libcxx-libc-shared INTERFACE) | ||
endif() |
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