Several corrections to the CMake project files (thanks, Ozkan!).

Fixes Bugzilla #2732.

CMakeLists.txt

@@ -596,7 +596,7 @@ if(LIBC)
       set(CMAKE_REQUIRED_LIBRARIES m)
       foreach(_FN
               atan atan2 ceil copysign cos cosf fabs floor log pow scalbn sin
-              sinf sqrt sqrtf tan tanf)
+              sinf sqrt sqrtf tan tanf acos asin)
         string(TOUPPER ${_FN} _UPPER)
         set(_HAVEVAR "HAVE_${_UPPER}")
         check_function_exists("${_FN}" ${_HAVEVAR})
@@ -608,6 +608,15 @@ if(LIBC)
     check_library_exists(iconv iconv_open "" HAVE_LIBICONV)
     if(HAVE_LIBICONV)
       list(APPEND EXTRA_LIBS iconv)
+      set(HAVE_ICONV 1)
+    endif()
+
+    if(NOT APPLE)
+      check_include_file(alloca.h HAVE_ALLOCA_H)
+      check_function_exists(alloca HAVE_ALLOCA)
+    else()
+      set(HAVE_ALLOCA_H 1)
+      set(HAVE_ALLOCA 1)
     endif()
 
     check_struct_has_member("struct sigaction" "sa_sigaction" "signal.h" HAVE_SA_SIGACTION)

cmake/sdlchecks.cmake

@@ -725,7 +725,7 @@ macro(CheckOpenGLESX11)
   endif()
 endmacro()
 
-# Rquires:
+# Requires:
 # - nada
 # Optional:
 # - THREADS opt
@@ -776,13 +776,17 @@ macro(CheckPTHREAD)
 
     # Run some tests
     set(CMAKE_REQUIRED_FLAGS "${PTHREAD_CFLAGS} ${PTHREAD_LDFLAGS}")
-    check_c_source_runs("
+    if(CMAKE_CROSSCOMPILING)
+      set(HAVE_PTHREADS 1)
+    else()
+      check_c_source_runs("
         #include <pthread.h>
         int main(int argc, char** argv) {
           pthread_attr_t type;
           pthread_attr_init(&type);
           return 0;
         }" HAVE_PTHREADS)
+    endif()
     if(HAVE_PTHREADS)
       set(SDL_THREAD_PTHREAD 1)
       list(APPEND EXTRA_CFLAGS ${PTHREAD_CFLAGS})
@@ -831,9 +835,8 @@ macro(CheckPTHREAD)
           #include <pthread.h>
           #include <pthread_np.h>
           int main(int argc, char** argv) { return 0; }" HAVE_PTHREAD_NP_H)
-      check_function_exists(pthread_setname_np HAVE_PTHREAD_setNAME_NP)
-      check_function_exists(pthread_set_name_np HAVE_PTHREAD_set_NAME_NP)
-      set(CMAKE_REQUIRED_FLAGS)
+      check_function_exists(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
+      check_function_exists(pthread_set_name_np HAVE_PTHREAD_SET_NAME_NP)      set(CMAKE_REQUIRED_FLAGS)
 
       set(SOURCE_FILES ${SOURCE_FILES}
           ${SDL2_SOURCE_DIR}/src/thread/pthread/SDL_systhread.c