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[libc++] Add missing __has_include checks for C headers not provided by libc++

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This makes the library consistent in how it handles C library headers. For C headers provided by libc++,
we unconditionally include <foo.h> from <cfoo>, and then <foo.h> conditionally include_next <foo.h>.
For headers not provided by libc++, <cfoo> conditionally includes the system's <foo.h> directly.

Differential Revision: https://reviews.llvm.org/D138512
This commit is contained in:
Louis Dionne 2022-11-22 13:42:33 -05:00
parent 09b8b44760
commit 647ddc08f4
4 changed files with 29 additions and 4 deletions
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7
libcxx/include/cassert
View File

@ -18,7 +18,14 @@ Macros:
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
// <assert.h> is not provided by libc++
#if __has_include(<assert.h>)
# include <assert.h>
# ifdef _LIBCPP_ASSERT_H
# error "If libc++ starts defining <assert.h>, the __has_include check should move to libc++'s <assert.h>"
# endif
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header

4
libcxx/include/csignal
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@ -42,8 +42,12 @@ int raise(int sig);
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
// <signal.h> is not provided by libc++
#if __has_include(<signal.h>)
# include <signal.h>
# ifdef _LIBCPP_SIGNAL_H
# error "If libc++ starts defining <signal.h>, the __has_include check should move to libc++'s <signal.h>"
# endif
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

7
libcxx/include/cstdarg
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@ -33,7 +33,14 @@ Types:
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
// <stdarg.h> is not provided by libc++
#if __has_include(<stdarg.h>)
# include <stdarg.h>
# ifdef _LIBCPP_STDARG_H
# error "If libc++ starts defining <stdarg.h>, the __has_include check should move to libc++'s <stdarg.h>"
# endif
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header

7
libcxx/include/ctime
View File

@ -47,7 +47,14 @@ int timespec_get( struct timespec *ts, int base); // C++17
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
// <time.h> is not provided by libc++
#if __has_include(<time.h>)
# include <time.h>
# ifdef _LIBCPP_TIME_H
# error "If libc++ starts defining <time.h>, the __has_include check should move to libc++'s <time.h>"
# endif
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header