use objdump to dump symbols

Author: waruqi

xmake/rules/utils/symbols/export_all/export_all.lua

@@ -64,6 +64,22 @@ function _get_allsymbols_by_dumpbin(target, dumpbin, opt)
     return allsymbols
 end
 
+-- use objdump to get all symbols from object files
+function _get_allsymbols_by_objdump(target, objdump, opt)
+    opt = opt or {}
+    local allsymbols = hashset.new()
+    local export_classes = opt.export_classes
+    for _, objectfile in ipairs(target:objectfiles()) do
+        local objectsymbols = try { function () return os.iorunv(objdump, {"--syms", objectfile}) end }
+        if objectsymbols then
+            for _, line in ipairs(objectsymbols:split('\n', {plain = true})) do
+                print(line)
+            end
+        end
+    end
+    return allsymbols
+end
+
 -- export all symbols for dynamic library
 function main(target, opt)
 
@@ -90,6 +106,9 @@ function main(target, opt)
         if msvc:check() then
             local dumpbin = assert(find_tool("dumpbin", {envs = msvc:runenvs()}), "dumpbin not found!")
             allsymbols = _get_allsymbols_by_dumpbin(target, dumpbin.program, {export_classes = export_classes})
+        elseif target:has_tool("cc", "clang", "clang_cl", "clangxx") then
+            local objdump = assert(find_tool("llvm-objdump") or find_tool("objdump"), "objdump not found!")
+            allsymbols = _get_allsymbols_by_dumpbin(target, objdump.program, {export_classes = export_classes})
         end
 
         -- export all symbols