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build: skip detecting pipe2() for Apple targets

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To avoid (mis-)detecting it via the internal Apple library
`/usr/lib/system/libsystem_sim_kernel.dylib` when targeting iPhone
Simulator (seen with iPhoneSimulator26.4.sdk).

Reported-by: Ian Spence
Fixes #21236

Closes #21271
This commit is contained in:
Viktor Szakats 2026-04-08 20:46:06 +02:00
parent 567803db79
commit 1737e47f59
No known key found for this signature in database
2 changed files with 16 additions and 2 deletions
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8
CMakeLists.txt
View File

@ -1646,7 +1646,6 @@ check_symbol_exists("getaddrinfo" "${CURL_INCLUDES};stdlib.h;string.h" HAVE_
check_symbol_exists("getifaddrs" "${CURL_INCLUDES};stdlib.h" HAVE_GETIFADDRS) # ifaddrs.h
check_symbol_exists("freeaddrinfo" "${CURL_INCLUDES}" HAVE_FREEADDRINFO) # ws2tcpip.h sys/socket.h netdb.h
check_function_exists("pipe" HAVE_PIPE)
check_function_exists("pipe2" HAVE_PIPE2)
check_function_exists("eventfd" HAVE_EVENTFD)
check_symbol_exists("getpeername" "${CURL_INCLUDES}" HAVE_GETPEERNAME) # winsock2.h unistd.h proto/bsdsocket.h
check_symbol_exists("getsockname" "${CURL_INCLUDES}" HAVE_GETSOCKNAME) # winsock2.h unistd.h proto/bsdsocket.h
@ -1654,6 +1653,13 @@ check_function_exists("getrlimit" HAVE_GETRLIMIT)
check_function_exists("setlocale" HAVE_SETLOCALE)
check_function_exists("setrlimit" HAVE_SETRLIMIT)
if(NOT APPLE)
# Apple platforms do not offer pipe2(), but the iPhone Simulator-specific
# /usr/lib/system/libsystem_sim_kernel.dylib exports it. To avoid false
# detection, omit this feature check for Apple targets.
check_function_exists("pipe2" HAVE_PIPE2)
endif()
if(NOT WIN32)
check_function_exists("if_nametoindex" HAVE_IF_NAMETOINDEX) # net/if.h
check_function_exists("realpath" HAVE_REALPATH)

10
configure.ac
View File

@ -4127,7 +4127,6 @@ AC_CHECK_FUNCS([\
gettimeofday \
mach_absolute_time \
pipe \
pipe2 \
poll \
sendmmsg \
sendmsg \
@ -4137,6 +4136,15 @@ AC_CHECK_FUNCS([\
utimes \
])
if test "$curl_cv_apple" != "yes"; then
dnl Apple platforms do not offer pipe2(), but the iPhone Simulator-specific
dnl /usr/lib/system/libsystem_sim_kernel.dylib exports it. To avoid false
dnl detection, omit this feature check for Apple targets.
AC_CHECK_FUNCS([\
pipe2 \
])
fi
if test "$curl_cv_native_windows" != "yes"; then
AC_CHECK_FUNCS([\
if_nametoindex \