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[libc++] Provide flag for RUNTIMES_USE_LIBC=llvm-libc (#174967)

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There was no flag added for llvm-libc when picolibc and newlib were
provided in https://github.com/llvm/llvm-project/pull/147956 - the
missing flag breaks libc++ iostream support now because this check
9a8421fa61/libcxx/include/__config (L719)
fails unless an LLVM libc header is included.
This commit is contained in:
Volodymyr Turanskyy 2026-01-15 12:24:39 +00:00 committed by GitHub
parent a60c9a942f
commit dc5e1d05bf
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GPG Key ID: B5690EEEBB952194
7 changed files with 8 additions and 5 deletions
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2
libcxx/CMakeLists.txt
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@ -777,6 +777,8 @@ if (RUNTIMES_USE_LIBC STREQUAL "picolibc")
config_define(1 _LIBCPP_LIBC_NEWLIB)
elseif (RUNTIMES_USE_LIBC STREQUAL "newlib")
config_define(1 _LIBCPP_LIBC_NEWLIB)
elseif (RUNTIMES_USE_LIBC STREQUAL "llvm-libc")
config_define(1 _LIBCPP_LIBC_LLVM_LIBC)
endif()
# TODO: Remove in LLVM 21. We're leaving an error to make this fail explicitly.

2
libcxx/include/__config
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@ -702,7 +702,7 @@ typedef __char32_t char32_t;
# endif
# if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) || \
_LIBCPP_HAS_MUSL_LIBC || defined(__OpenBSD__) || defined(__LLVM_LIBC__)
_LIBCPP_HAS_MUSL_LIBC || defined(__OpenBSD__) || _LIBCPP_LIBC_LLVM_LIBC
# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
# endif

1
libcxx/include/__config_site.in
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@ -45,6 +45,7 @@
// C libraries
#cmakedefine01 _LIBCPP_LIBC_PICOLIBC
#cmakedefine01 _LIBCPP_LIBC_NEWLIB
#cmakedefine01 _LIBCPP_LIBC_LLVM_LIBC
// __USE_MINGW_ANSI_STDIO gets redefined on MinGW
#ifdef __clang__

2
libcxx/include/__random/binomial_distribution.h
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@ -98,7 +98,7 @@ public:
};
// Some libc declares the math functions to be `noexcept`.
#if _LIBCPP_GLIBC_PREREQ(2, 8) || defined(__LLVM_LIBC__)
#if _LIBCPP_GLIBC_PREREQ(2, 8) || _LIBCPP_LIBC_LLVM_LIBC
# define _LIBCPP_LGAMMA_R_NOEXCEPT _NOEXCEPT
#else
# define _LIBCPP_LGAMMA_R_NOEXCEPT

2
libcxx/src/chrono.cpp
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@ -31,7 +31,7 @@
# include <sys/time.h> // for gettimeofday and timeval
#endif
#if defined(__LLVM_LIBC__)
#if _LIBCPP_LIBC_LLVM_LIBC
# define _LIBCPP_HAS_TIMESPEC_GET
#endif

2
libcxx/src/filesystem/filesystem_clock.cpp
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@ -32,7 +32,7 @@
# include <sys/time.h> // for gettimeofday and timeval
#endif
#if defined(__LLVM_LIBC__)
#if _LIBCPP_LIBC_LLVM_LIBC
# define _LIBCPP_HAS_TIMESPEC_GET
#endif

2
libcxx/src/include/config_elast.h
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@ -21,7 +21,7 @@
// where strerror/strerror_r can't handle out-of-range errno values.
#if defined(ELAST)
# define _LIBCPP_ELAST ELAST
#elif defined(__LLVM_LIBC__)
#elif _LIBCPP_LIBC_LLVM_LIBC
// No _LIBCPP_ELAST needed for LLVM libc
#elif _LIBCPP_LIBC_NEWLIB
# define _LIBCPP_ELAST __ELASTERROR