build Open CASCADE (OCCT) V7_8_1 under musl libc

occt_musl_libc_2024-04-14_12h01m03_d9caf6d.diff

diff --git a/src/OSD/OSD_MemInfo.cxx b/src/OSD/OSD_MemInfo.cxx
index 8a9f10e09d..0406ef15b0 100644
--- a/src/OSD/OSD_MemInfo.cxx
+++ b/src/OSD/OSD_MemInfo.cxx
@@ -13,6 +13,8 @@
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
+#define __GENERIC_LIB_C__
+
 #if (defined(_WIN32) || defined(__WIN32__))
   #include <windows.h>
   #include <winbase.h>
@@ -184,12 +186,14 @@ void OSD_MemInfo::Update()
     #endif
   #endif
 
+#ifndef __GENERIC_LIB_C__
   #ifdef HAS_MALLINFO2
     const struct mallinfo2 aMI = mallinfo2();
   #else
     const struct mallinfo aMI = mallinfo();
   #endif
     myCounters[MemHeapUsage] = aMI.uordblks;
+#endif
   }
 
   if (!IsActive (MemVirtual)
diff --git a/src/OSD/OSD_signal.cxx b/src/OSD/OSD_signal.cxx
index 7da3f19004..7fc75a0c2d 100644
--- a/src/OSD/OSD_signal.cxx
+++ b/src/OSD/OSD_signal.cxx
@@ -11,6 +11,7 @@
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
+#define __GENERIC_LIB_C__
 
 #include <OSD.hxx>
 #include <OSD_Exception_CTRL_BREAK.hxx>
@@ -976,6 +977,7 @@ void OSD::SetFloatingSignal (Standard_Boolean theFloatingSignal)
 {
 #if defined (__linux__)
   feclearexcept (FE_ALL_EXCEPT);
+#ifndef __GENERIC_LIB_C__
   if (theFloatingSignal)
   {
     feenableexcept (_OSD_FPX);
@@ -984,6 +986,7 @@ void OSD::SetFloatingSignal (Standard_Boolean theFloatingSignal)
   {
     fedisableexcept (_OSD_FPX);
   }
+#endif
 #elif defined (__sun) || defined (SOLARIS)
   int aSunStat = 0;
   sigfpe_handler_type anFpeHandler = (theFloatingSignal ? (sigfpe_handler_type)Handler : NULL);
@@ -1007,7 +1010,7 @@ void OSD::SetFloatingSignal (Standard_Boolean theFloatingSignal)
 //=======================================================================
 Standard_Boolean OSD::ToCatchFloatingSignals()
 {
-#if defined (__linux__)
+#if defined (__linux__) && !defined(__GENERIC_LIB_C__)
   return (fegetexcept() & _OSD_FPX) != 0;
 #else
   return Standard_False;
diff --git a/src/Standard/Standard_StackTrace.cxx b/src/Standard/Standard_StackTrace.cxx
index 271c7e2b3b..3738ccd300 100644
--- a/src/Standard/Standard_StackTrace.cxx
+++ b/src/Standard/Standard_StackTrace.cxx
@@ -12,6 +12,8 @@
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
+#define __GENERIC_LIB_C__
+
 #include <Standard.hxx>
 
 #include <Message.hxx>
@@ -313,6 +315,9 @@ Standard_Boolean Standard::StackTrace (char* theBuffer,
   Message::SendTrace ("Standard::StackTrace() is not implemented for this CPU architecture");
   return false;
 #endif
+#elif defined(__GENERIC_LIB_C__)
+  Message::SendTrace ("Standard::StackTrace() is not implemented");
+  return false;
 #else
   const int aTopSkip = theNbTopSkip + 1; // skip this function call and specified extra number
   int aNbTraces = theNbTraces + aTopSkip;