CMake: support building with musl libc

Instead of using macros like GLIBC we can use the CMake build
systems internal functions to check if some header or functions are
present on the running system's libc.

Add ./build_files/cmake/have_features.cmake to add checks for
platform features which can be used to set defines for source
files that require them.

Reviewed By: campbellbarton

Ref D15696

6 files changed, 25 insertions, 5 deletions

diff --git a/source/blender/blenlib/CMakeLists.txt b/source/blender/blenlib/CMakeLists.txt
index d39a586206f..78455c44fe1 100644
--- a/source/blender/blenlib/CMakeLists.txt
+++ b/source/blender/blenlib/CMakeLists.txt
@@ -1,6 +1,10 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 # Copyright 2006 Blender Foundation. All rights reserved.
 
+if(HAVE_EXECINFO_H)
+  add_definitions(-DHAVE_EXECINFO_H)
+endif()
+
 set(INC
   .
   # ../blenkernel  # don't add this back!
diff --git a/source/blender/blenlib/intern/system.c b/source/blender/blenlib/intern/system.c
index 35e26e0cb33..781b38f713a 100644
--- a/source/blender/blenlib/intern/system.c
+++ b/source/blender/blenlib/intern/system.c
@@ -21,7 +21,9 @@
 
 #  include "BLI_winstuff.h"
 #else
-#  include <execinfo.h>
+#  if defined(HAVE_EXECINFO_H)
+#    include <execinfo.h>
+#  endif
 #  include <unistd.h>
 #endif
 
@@ -61,9 +63,9 @@ int BLI_cpu_support_sse2(void)
 #if !defined(_MSC_VER)
 void BLI_system_backtrace(FILE *fp)
 {
-  /* ------------- */
-  /* Linux / Apple */
-#  if defined(__linux__) || defined(__APPLE__)
+  /* ----------------------- */
+  /* If system as execinfo.h */
+#  if defined(HAVE_EXECINFO_H)
 
 #    define SIZE 100
   void *buffer[SIZE];
diff --git a/source/blender/makesdna/intern/CMakeLists.txt b/source/blender/makesdna/intern/CMakeLists.txt
index c26696b4572..97198117a83 100644
--- a/source/blender/makesdna/intern/CMakeLists.txt
+++ b/source/blender/makesdna/intern/CMakeLists.txt
@@ -5,6 +5,11 @@
 
 add_definitions(-DWITH_DNA_GHASH)
 
+# Needed for `mallocn.c`.
+if(HAVE_MALLOC_STATS_H)
+  add_definitions(-DHAVE_MALLOC_STATS_H)
+endif()
+
 blender_include_dirs(
   ../../../../intern/atomic
   ../../../../intern/guardedalloc
diff --git a/source/blender/makesrna/intern/CMakeLists.txt b/source/blender/makesrna/intern/CMakeLists.txt
index b0fb86c8bc3..7e6e3bcf90e 100644
--- a/source/blender/makesrna/intern/CMakeLists.txt
+++ b/source/blender/makesrna/intern/CMakeLists.txt
@@ -6,6 +6,11 @@ if(CMAKE_COMPILER_IS_GNUCC)
   string(APPEND CMAKE_C_FLAGS " -Werror=implicit-function-declaration")
 endif()
 
+# Needed for `mallocn.c`.
+if(HAVE_MALLOC_STATS_H)
+  add_definitions(-DHAVE_MALLOC_STATS_H)
+endif()
+
 # files rna_access.c rna_define.c makesrna.c intentionally excluded.
 set(DEFSRC
   rna_ID.c
diff --git a/source/creator/CMakeLists.txt b/source/creator/CMakeLists.txt
index becba393a36..5b01280c1c2 100644
--- a/source/creator/CMakeLists.txt
+++ b/source/creator/CMakeLists.txt
@@ -21,6 +21,10 @@ set(LIB
   bf_windowmanager
 )
 
+if(HAVE_FEENABLEEXCEPT)
+  add_definitions(-DHAVE_FEENABLEEXCEPT)
+endif()
+
 if(WITH_TBB)
   # Force TBB libraries to be in front of MKL (part of OpenImageDenoise), so
   # that it is initialized before MKL and static library initialization order
diff --git a/source/creator/creator_signals.c b/source/creator/creator_signals.c
index 226277da363..65352f047f1 100644
--- a/source/creator/creator_signals.c
+++ b/source/creator/creator_signals.c
@@ -256,7 +256,7 @@ void main_signal_setup_fpe(void)
    * set breakpoints on sig_handle_fpe */
   signal(SIGFPE, sig_handle_fpe);
 
-#    if defined(__linux__) && defined(__GNUC__)
+#    if defined(__linux__) && defined(__GNUC__) && defined(HAVE_FEENABLEEXCEPT)
   feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
 #    endif /* defined(__linux__) && defined(__GNUC__) */
 #    if defined(OSX_SSE_FPE)