Detect the need for libexecinfo in premake. This is mostly useful for musl Linux.

Patch By: nephele
Differential Revision: https://code.wildfiregames.com/D2671
This was SVN commit r23787.

binaries/data/mods/public/gui/credits/texts/programming.json

@@ -168,6 +168,7 @@
 				{ "nick": "myconid" },
 				{ "nick": "nani", "name": "S. N." },
 				{ "nick": "nd3c3nt", "name": "Gavin Fowler" },
+				{ "nick": "nephele" },
 				{ "nick": "Nescio" },
 				{ "nick": "niektb", "name": "Niek ten Brinke" },
 				{ "nick": "njm" },

build/premake/premake5.lua

@@ -90,6 +90,19 @@ else
 	end
 end
 
+-- Test whether we need to link libexecinfo.
+-- This is mostly the case on musl systems, as well as on BSD systems : only glibc provides the
+-- backtrace symbols we require in the libc, for other libcs we use the libexecinfo library.
+local link_execinfo = false
+if os.istarget("bsd") then
+	link_execinfo = true
+elseif os.istarget("linux") then
+	local _, link_errorCode = os.outputof(cc .. " ./tests/execinfo.c -o /dev/null")
+	if link_errorCode ~= 0 then
+		link_execinfo = true
+	end
+end
+
 -- Set up the Workspace
 workspace "pyrogenesis"
 targetdir(rootdir.."/binaries/system")
@@ -1005,16 +1018,17 @@ function setup_main_exe ()
 			links { "log" }
 		end
 
+		if link_execinfo then
+			links {
+				"execinfo"
+			}
+		end
+
 		if os.istarget("linux") or os.getversion().description == "GNU/kFreeBSD" then
 			links {
 				-- Dynamic libraries (needed for linking for gold)
 				"dl",
 			}
-		elseif os.istarget("bsd") then
-			links {
-				-- Needed for backtrace* on BSDs
-				"execinfo",
-			}
 		end
 
 		-- Threading support
@@ -1380,6 +1394,11 @@ function setup_tests()
 
 	elseif os.istarget("linux") or os.istarget("bsd") then
 
+		if link_execinfo then
+			links {
+				"execinfo"
+			}
+		end
 		if not _OPTIONS["android"] and not (os.getversion().description == "OpenBSD") then
 			links { "rt" }
 		end
@@ -1394,11 +1413,6 @@ function setup_tests()
 				-- Dynamic libraries (needed for linking for gold)
 				"dl",
 			}
-		elseif os.istarget("bsd") then
-			links {
-				-- Needed for backtrace* on BSDs
-				"execinfo",
-			}
 		end
 
 		-- Threading support

build/premake/tests/execinfo.c

@@ -0,0 +1,6 @@
+#include <execinfo.h>
+
+int main() {
+	backtrace(0, 0);
+	return 0;
+}