From 32c4af6d0f9b948acf66e4a06c65f2db53600fe2 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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6cf4e00b0..64752383b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -774,6 +774,13 @@ file(COPY ${CMAKE_SOURCE_DIR}/.clang-format DESTINATION ${CMAKE_SOURCE_DIR})
 OCCT_MAKE_OS_WITH_BITNESS()
 OCCT_MAKE_COMPILER_SHORT_NAME()
 
+# 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)
+
 # do not define INSTALL_DIR_BIN for win.
 # Leave library structure for win: <prefix>/win64/vc10/bin(d)
 if (NOT DEFINED INSTALL_DIR_BIN)
diff --git a/src/Standard/Standard_StackTrace.cxx b/src/Standard/Standard_StackTrace.cxx
index 811c09e9b..2f6243e6c 100644
--- 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(_WIN32) && !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && defined (HAS_EXECINFO_H)
   #include <execinfo.h>
 #elif defined(_WIN32) && !defined(OCCT_UWP)
 
@@ -320,7 +320,7 @@ 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);
@@ -367,5 +367,7 @@ Standard_Boolean Standard::StackTrace(char*     theBuffer,
     strcat(theBuffer, "\n=============");
   }
   return true;
+#else
+  return false;
 #endif
 }
-- 
2.51.2