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cmake: use check_symbol_exists, not check_function_exists (thanks, Manuel!)

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This fixes the problem where we think iOS has fseeko64, etc, but doesn't.

Fixes Bugzilla #4885.
This commit is contained in:
Ryan C. Gordon
2020-04-13 15:22:09 -04:00
parent c0a875faff
commit 952bac7c47
2 changed files with 25 additions and 16 deletions
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21
CMakeLists.txt
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@@ -15,7 +15,6 @@ project(SDL2 C CXX)
# !!! FIXME: properly resolved.
#cmake_policy(SET CMP0042 OLD)
include(CheckFunctionExists)
include(CheckLibraryExists)
include(CheckIncludeFiles)
include(CheckIncludeFile)
@@ -789,7 +788,8 @@ if(LIBC)
check_include_file("${_HEADER}" ${_HAVE_H})
endforeach()
check_include_files("dlfcn.h;stdint.h;stddef.h;inttypes.h;stdlib.h;strings.h;string.h;float.h" STDC_HEADERS)
set(STDC_HEADER_NAMES "dlfcn.h;stdint.h;stddef.h;inttypes.h;stdlib.h;stdio.h;strings.h;wchar.h;string.h;float.h")
check_include_files("${STDC_HEADER_NAMES}" STDC_HEADERS)
check_type_size("size_t" SIZEOF_SIZE_T)
check_symbol_exists(M_PI math.h HAVE_M_PI)
# TODO: refine the mprotect check
@@ -803,14 +803,21 @@ if(LIBC)
_uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull
atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp
wcscmp wcsdup wcslcat wcslcpy wcslen wcsncmp wcsstr
sscanf vsscanf vsnprintf fopen64 fseeko fseeko64 sigaction setjmp
nanosleep sysconf sysctlbyname getauxval poll _Exit
sscanf vsscanf vsnprintf fopen64 fseeko fseeko64 _Exit
)
string(TOUPPER ${_FN} _UPPER)
set(_HAVEVAR "HAVE_${_UPPER}")
check_function_exists("${_FN}" ${_HAVEVAR})
check_symbol_exists("${_FN}" "${STDC_HEADER_NAMES}" ${_HAVEVAR})
endforeach()
check_symbol_exists(sigaction "signal.h" HAVE_SIGACTION)
check_symbol_exists(setjmp "setjmp.h" HAVE_SETJMP)
check_symbol_exists(nanosleep "time.h" HAVE_NANOSLEEP)
check_symbol_exists(sysconf "unistd.h" HAVE_SYSCONF)
check_symbol_exists(sysctlbyname "sys/types.h;sys/sysctl.h" HAVE_SYSCTLBYNAME)
check_symbol_exists(getauxval "sys/auxv.h" HAVE_GETAUXVAL)
check_symbol_exists(poll "poll.h" HAVE_POLL)
check_library_exists(m pow "" HAVE_LIBM)
if(HAVE_LIBM)
set(CMAKE_REQUIRED_LIBRARIES m)
@@ -821,7 +828,7 @@ if(LIBC)
asin asinf trunc truncf)
string(TOUPPER ${_FN} _UPPER)
set(_HAVEVAR "HAVE_${_UPPER}")
check_function_exists("${_FN}" ${_HAVEVAR})
check_symbol_exists("${_FN}" "math.h" ${_HAVEVAR})
endforeach()
set(CMAKE_REQUIRED_LIBRARIES)
list(APPEND EXTRA_LIBS m)
@@ -835,7 +842,7 @@ if(LIBC)
if(NOT APPLE)
check_include_file(alloca.h HAVE_ALLOCA_H)
check_function_exists(alloca HAVE_ALLOCA)
check_symbol_exists(alloca "alloca.h" HAVE_ALLOCA)
else()
set(HAVE_ALLOCA_H 1)
set(HAVE_ALLOCA 1)