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Bug 5316

Summary: several detection issues with cmake (alloca, iconv, ...)
Product: SDL Reporter: Ozkan Sezer <sezeroz>
Component: buildAssignee: Ozkan Sezer <sezeroz>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 Keywords: target-1.2.14
Version: HG 2.0   
Hardware: All   
OS: All   

Description Ozkan Sezer 2020-10-11 23:55:24 UTC 
There are several detection issues is SDL's cmake'ry. Ones
that I'm aware of:

- iconv (HAVE_ICONV): SDL's cmake only looks for iconv_open()
  in libiconv.  However, it can be in other libraries, most
  importantly it can be in libc itself which is the case with
  glibc: On linux, cmake reports failure for it and does not
  define HAVE_ICONV. One solution I can find is here:
  https://fossies.org/linux/poppler/cmake/modules/FindIconv.cmake
  There can be others.

- alloca (HAVE_ALLOCA): SDL's cmake defines HAVE_ALLOCA only with
  alloca.h in (NOT APPLE) cases, which need not be true:  MinGW,
  for example, does have alloca() but it's in malloc.h. Therefore
  cmake doesn't define HAVE_ALLOCA for MinGW.

There may be other issues...