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Fix CheckFunctionExistsEx() cmake macro on win32

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For example under mingw64 it could not detect that strtok_r() exists,
because it checks with:
  void *p = func_name;

And for this you need the function to be defined, so just sync our
CheckFunctionExistsEx.c with CheckFunctionExists.c from cmake (and later
we should drop them out) since it does correct things to detech
functions existence.

Also for WIN32 there is -FIwinsock2.h -FIws2tcpip.h, and I guess that is
not works for mingw gcc (since -F in gcc is framework, and in windows
-FI is like -include in gcc). But looks like we do not need them
already (due to fixed CheckFunctionExistsEx()).

Refs: #605
(cherry picked from commit accf383e044257ecdef002ea255056a5d15a4811)
This commit is contained in:
Azat Khuzhin 2018-04-23 01:50:55 +03:00 committed by Azat Khuzhin
parent 0d194c4e49
commit 44fa5b19f7
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1 changed files with 13 additions and 15 deletions
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28
cmake/CheckFunctionExistsEx.c
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@ -1,30 +1,28 @@
#ifdef CHECK_FUNCTION_EXISTS
#ifndef _WIN32
char CHECK_FUNCTION_EXISTS();
#ifdef __cplusplus
extern "C"
#endif
char
CHECK_FUNCTION_EXISTS(void);
#ifdef __CLASSIC_C__
int main(){
int main()
{
int ac;
char*av[];
char* av[];
#else
int main(int ac, char*av[]){
int main(int ac, char* av[])
{
#endif
#ifdef _WIN32
void * p = &CHECK_FUNCTION_EXISTS;
#else
CHECK_FUNCTION_EXISTS();
#endif
if(ac > 1000)
{
if (ac > 1000) {
return *av[0];
}
}
return 0;
}
#else /* CHECK_FUNCTION_EXISTS */
#else /* CHECK_FUNCTION_EXISTS */
# error "CHECK_FUNCTION_EXISTS has to specify the function"
#error "CHECK_FUNCTION_EXISTS has to specify the function"
#endif /* CHECK_FUNCTION_EXISTS */