From 4351ac37b19bf43ff9a8f21e5126deb7f43f751e Mon Sep 17 00:00:00 2001
From: Violet Purcell <vimproved@inventati.org>
Date: Tue, 11 Jul 2023 16:13:32 -0400
Subject: [PATCH] Fix building with musl

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -554,6 +554,10 @@ OCCT_IS_PRODUCT_REQUIRED (CSF_EIGEN CAN_USE_EIGEN)
 # define CSF variable
 OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/occt_csf")
 
+# Check for execinfo.h
+include(CheckIncludeFile)
+CHECK_INCLUDE_FILE("execinfo.h" HAS_EXECINFO_H)
+
 # Tcl (mandatory for Draw Harness)
 if (USE_TCL)
   message (STATUS "Info: TCL is used by OCCT")
--- a/src/OSD/OSD_MemInfo.cxx
+++ b/src/OSD/OSD_MemInfo.cxx
@@ -184,12 +184,16 @@ void OSD_MemInfo::Update()
     #endif
   #endif
 
+  #if defined(__GLIBC__)
   #ifdef HAS_MALLINFO2
     const struct mallinfo2 aMI = mallinfo2();
   #else
     const struct mallinfo aMI = mallinfo();
   #endif
     myCounters[MemHeapUsage] = aMI.uordblks;
+  #else
+    myCounters[MemHeapUsage] = 0;
+  #endif
   }
 
   if (!IsActive (MemVirtual)
--- a/src/OSD/OSD_signal.cxx
+++ b/src/OSD/OSD_signal.cxx
@@ -758,7 +758,7 @@ typedef void (* SIG_PFV) (int);
 
 #include <signal.h>
 
-#if !defined(__ANDROID__) && !defined(__QNX__) && !defined(__EMSCRIPTEN__)
+#if !defined(__ANDROID__) && !defined(__QNX__) && !defined(__EMSCRIPTEN__) &&  defined(__GLIBC__)
   #include <sys/signal.h>
 #endif
 
@@ -974,7 +974,7 @@ static void SegvHandler(const int theSignal,
 //=======================================================================
 void OSD::SetFloatingSignal (Standard_Boolean theFloatingSignal)
 {
-#if defined (__linux__)
+#if defined (__linux__) && defined(__GLIBC__)
   feclearexcept (FE_ALL_EXCEPT);
   if (theFloatingSignal)
   {
@@ -1007,7 +1007,7 @@ void OSD::SetFloatingSignal (Standard_Boolean theFloatingSignal)
 //=======================================================================
 Standard_Boolean OSD::ToCatchFloatingSignals()
 {
-#if defined (__linux__)
+#if defined (__linux__) && defined(__GLIBC__)
   return (fegetexcept() & _OSD_FPX) != 0;
 #else
   return Standard_False;
--- a/src/Standard/Standard_StackTrace.cxx
+++ b/src/Standard/Standard_StackTrace.cxx
@@ -29,7 +29,7 @@
   //#include <unwind.h>
 #elif defined(__QNX__)
   //#include <backtrace.h> // requires linking to libbacktrace
-#elif !defined(_WIN32) && !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE)
+#elif defined (HAS_EXECINFO_H)
   #include <execinfo.h>
 #elif defined(_WIN32) && !defined(OCCT_UWP)
 
@@ -313,7 +313,7 @@ Standard_Boolean Standard::StackTrace (char* theBuffer,
   Message::SendTrace ("Standard::StackTrace() is not implemented for this CPU architecture");
   return false;
 #endif
-#else
+#elif defined (HAS_EXECINFO_H)
   const int aTopSkip = theNbTopSkip + 1; // skip this function call and specified extra number
   int aNbTraces = theNbTraces + aTopSkip;
   void** aStackArr = (void** )alloca (sizeof(void*) * aNbTraces);
@@ -360,5 +360,7 @@ Standard_Boolean Standard::StackTrace (char* theBuffer,
     strcat (theBuffer, "\n=============");
   }
   return true;
+#else
+  return false;
 #endif
 }
-- 
2.41.0