[CompilerSupportLibraries] Add libssp as product (#6027)

* [CompilerSupportLibraries] Add `libssp` as product

* [CompilerSupportLibraries] Add libssp on non-Musl platforms

[skip build]

Author: giordano

C/CompilerSupportLibraries/CompilerSupportLibraries@v1.0/build_tarballs.jl

@@ -2,4 +2,4 @@ include("../common.jl")
 
 build_csl(ARGS, v"1.0.2"; preferred_gcc_version=v"12", windows_staticlibs=true, julia_compat="1.9")
 
-# Build trigger: 1
+# Build trigger: 2

C/CompilerSupportLibraries/common.jl

@@ -150,16 +150,20 @@ install_license /usr/share/licenses/GPL-3.0+
                 # Don't push to the common products, otherwise we'll keep
                 # accumulating libatomic into it when looping over all platforms.
                 vcat(common_products, LibraryProduct("libatomic", :libatomic))
-            elseif windows_staticlibs && Sys.iswindows(platform)
-                vcat(common_products,
-                     [FileProduct("lib/libmsvcrt.a", :libmsvcrt_a),
-                      FileProduct("lib/libgcc.a", :libgcc_a),
-                      FileProduct("lib/libgcc_s.a", :libgcc_s_a),
-                      FileProduct("lib/libssp.dll.a", :libssp_dll_a),
-                      ])
             else
                 common_products
             end
+            if windows_staticlibs && Sys.iswindows(platform)
+                products = vcat(products,
+                                [FileProduct("lib/libmsvcrt.a", :libmsvcrt_a),
+                                 FileProduct("lib/libgcc.a", :libgcc_a),
+                                 FileProduct("lib/libgcc_s.a", :libgcc_s_a),
+                                 FileProduct("lib/libssp.dll.a", :libssp_dll_a),
+                                 ])
+            end
+            if libc(platform) != "musl"
+                products = vcat(products, LibraryProduct("libssp", :libssp))
+            end
             build_tarballs(ARGS, name, version, sources, script, [platform], products, []; preferred_gcc_version, julia_compat)
         end
     end