From 8f2b2e92ffdec658d4eb999f41acf6c74a5b32ed Mon Sep 17 00:00:00 2001
From: Leon Marz <lmarz@cs.uni-frankfurt.de>
Date: Tue, 1 Sep 2020 09:09:50 +0200
Subject: [PATCH 1/2] musl fixes

[ Taken from https://git.alpinelinux.org/aports/plain/testing/blender/0001-musl-fixes.patch ]

Original Patch by Nathanael Copa

---
 CMakeLists.txt                              | 13 +++++++++++++
 intern/guardedalloc/intern/mallocn_intern.h |  2 +-
 intern/libc_compat/libc_compat.c            |  2 --
 source/blender/blenlib/intern/system.c      |  4 +++-
 source/creator/creator_signals.c            |  2 +-
 5 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cee8675..111e6e3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -138,6 +138,19 @@ get_blender_version()
 #-----------------------------------------------------------------------------
 # Options
 
+# musl-libc related checks (missing execinfo.h and feenableexcept())
+include(CheckIncludeFiles)
+check_include_files(execinfo.h HAVE_EXECINFO_H)
+if(HAVE_EXECINFO_H)
+  add_definitions(-DHAVE_EXECINFO_H)
+endif()
+
+include(CheckLibraryExists)
+check_library_exists(m feenableexcept "fenv.h" HAVE_FEENABLEEXCEPT)
+if(HAVE_FEENABLEEXCEPT)
+  add_definitions(-DHAVE_FEENABLEEXCEPT)
+endif()
+
 # Blender internal features
 option(WITH_BLENDER "Build blender (disable to build only the blender player)" ON)
 mark_as_advanced(WITH_BLENDER)
diff --git a/intern/guardedalloc/intern/mallocn_intern.h b/intern/guardedalloc/intern/mallocn_intern.h
index 8fc3e43..ee443c4 100644
--- a/intern/guardedalloc/intern/mallocn_intern.h
+++ b/intern/guardedalloc/intern/mallocn_intern.h
@@ -33,7 +33,7 @@
 #undef HAVE_MALLOC_STATS
 #define USE_MALLOC_USABLE_SIZE /* internal, when we have malloc_usable_size() */
 
-#if defined(__linux__) || (defined(__FreeBSD_kernel__) && !defined(__FreeBSD__)) || \
+#if defined(__linux__) && defined(HAVE_EXECINFO_H) || (defined(__FreeBSD_kernel__) && !defined(__FreeBSD__)) || \
     defined(__GLIBC__)
 #  include <malloc.h>
 #  define HAVE_MALLOC_STATS
diff --git a/intern/libc_compat/libc_compat.c b/intern/libc_compat/libc_compat.c
index 78e387e..d21c281 100644
--- a/intern/libc_compat/libc_compat.c
+++ b/intern/libc_compat/libc_compat.c
@@ -25,7 +25,6 @@
 #  include <features.h>
 #  include <math.h>
 
-#  if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 31)
 
 double __exp_finite(double x);
 double __exp2_finite(double x);
@@ -124,5 +123,4 @@ float __powf_finite(float x, float y)
   return powf(x, y);
 }
 
-#  endif /* __GLIBC_PREREQ */
 #endif   /* __linux__ */
diff --git a/source/blender/blenlib/intern/system.c b/source/blender/blenlib/intern/system.c
index 20edbb9..6e856cd 100644
--- a/source/blender/blenlib/intern/system.c
+++ b/source/blender/blenlib/intern/system.c
@@ -35,7 +35,9 @@
 
 #  include "BLI_winstuff.h"
 #else
+#if defined(HAVE_EXECINFO_H)
 #  include <execinfo.h>
+#endif
 #  include <unistd.h>
 #endif
 
@@ -80,7 +82,7 @@ void BLI_system_backtrace(FILE *fp)
 {
   /* ------------- */
   /* Linux / Apple */
-#  if defined(__linux__) || defined(__APPLE__)
+#  if defined(__linux__) && defined(HAVE_EXECINFO_H) || defined(__APPLE__)
 
 #    define SIZE 100
   void *buffer[SIZE];
diff --git a/source/creator/creator_signals.c b/source/creator/creator_signals.c
index ad0b7b2..01d5e37 100644
--- a/source/creator/creator_signals.c
+++ b/source/creator/creator_signals.c
@@ -269,7 +269,7 @@ 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)
-- 
2.28.0