Fix DECLARE LIBRARY against stripped .so file

.so files can be stripped such that they contain no "regular" symbol
table but do still contain the "dynamic" symbol table, this is pretty
typical for .so files. QB64-PE is supposed to check both tables when
linking against a .so file, but a bug in ab0c2b18 meant that the second
run of nm with the -D flag to check the dynamic symbol table no longer
happens. The fix is to introduce a new output file for the dynamic run
so that they are handled separately in terms of caching the result.

A new test .so file that only contains a dynamic symbol table was added
to avoid this in the future.

Fixes: #301

source/qb64pe.bas

@@ -12582,8 +12582,11 @@ END IF
 'Clear nm output from previous runs
 FOR x = 1 TO ResolveStaticFunctions
     IF LEN(ResolveStaticFunction_File(x)) THEN
-        s$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x))
+        s$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x), 0)
-        IF _FILEEXISTS(s$) THEN KILL s$
+        IF _FILEEXISTS(s$) THEN KILL s$: ClearBuffers s$
+
+        s$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x), 1)
+        IF _FILEEXISTS(s$) THEN KILL s$: ClearBuffers s$
     END IF
 NEXT x
 
@@ -12602,7 +12605,8 @@ IF os$ = "WIN" THEN
 
     'resolve static function definitions and add to global.txt
     FOR x = 1 TO ResolveStaticFunctions
-        nm_output_file$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x))
+        nm_output_file$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x), 0)
+        nm_output_file_dynamic$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x), 1)
         IF LEN(ResolveStaticFunction_File(x)) THEN
 
             n = 0
@@ -12659,8 +12663,8 @@ IF os$ = "WIN" THEN
             END IF
 
             IF n = 0 THEN 'a C++ dynamic object library?
-                IF NOT _FILEEXISTS(nm_output_file$) THEN
+                IF NOT _FILEEXISTS(nm_output_file_dynamic$) THEN
-                    SHELL _HIDE "cmd /c internal\c\c_compiler\bin\nm.exe " + AddQuotes$(ResolveStaticFunction_File(x)) + " -D --demangle -g >" + AddQuotes$(nm_output_file$)
+                    SHELL _HIDE "cmd /c internal\c\c_compiler\bin\nm.exe " + AddQuotes$(ResolveStaticFunction_File(x)) + " -D --demangle -g >" + AddQuotes$(nm_output_file_dynamic$)
                 END IF
                 s$ = " " + ResolveStaticFunction_Name(x) + "("
                 fh = OpenBuffer%("I", nm_output_file$)
@@ -12687,7 +12691,7 @@ IF os$ = "WIN" THEN
 
             IF n = 0 THEN 'a C dynamic object library?
                 s$ = " " + ResolveStaticFunction_Name(x)
-                fh = OpenBuffer%("I", nm_output_file$)
+                fh = OpenBuffer%("I", nm_output_file_dynamic$)
                 DO UNTIL EndOfBuf%(fh)
                     a$ = ReadBufLine$(fh)
                     IF LEN(a$) THEN
@@ -12751,7 +12755,8 @@ IF os$ = "LNX" THEN
     END IF
 
     FOR x = 1 TO ResolveStaticFunctions
-        nm_output_file$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x))
+        nm_output_file$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x), 0)
+        nm_output_file_dynamic$ = MakeNMOutputFilename$(ResolveStaticFunction_File(x), 1)
         IF LEN(ResolveStaticFunction_File(x)) THEN
 
             n = 0
@@ -12814,8 +12819,8 @@ IF os$ = "LNX" THEN
 
             IF n = 0 THEN 'a C++ dynamic object library?
                 IF MacOSX THEN GOTO macosx_libfind_failed
-                IF NOT _FILEEXISTS(nm_output_file$) THEN
+                IF NOT _FILEEXISTS(nm_output_file_dynamic$) THEN
-                    SHELL _HIDE "nm " + AddQuotes$(ResolveStaticFunction_File(x)) + " -D --demangle -g >" + AddQuotes$(nm_output_file$) + " 2>" + AddQuotes$(tmpdir$ + "nm_error.txt")
+                    SHELL _HIDE "nm " + AddQuotes$(ResolveStaticFunction_File(x)) + " -D --demangle -g >" + AddQuotes$(nm_output_file_dynamic$) + " 2>" + AddQuotes$(tmpdir$ + "nm_error.txt")
                 END IF
                 s$ = " " + ResolveStaticFunction_Name(x) + "("
                 fh = OpenBuffer%("I", nm_output_file$)
@@ -12842,7 +12847,7 @@ IF os$ = "LNX" THEN
 
             IF n = 0 THEN 'a C dynamic object library?
                 s$ = " " + ResolveStaticFunction_Name(x)
-                fh = OpenBuffer%("I", nm_output_file$)
+                fh = OpenBuffer%("I", nm_output_file_dynamic$)
                 DO UNTIL EndOfBuf%(fh)
                     a$ = ReadBufLine$(fh)
                     IF LEN(a$) THEN

source/utilities/build.bas

@@ -27,6 +27,8 @@ FUNCTION GetMakeExecutable$ ()
     END IF
 END FUNCTION
 
-FUNCTION MakeNMOutputFilename$ (libfile AS STRING)
+FUNCTION MakeNMOutputFilename$ (libfile AS STRING, dynamic As Long)
-    MakeNMOutputFilename$ = tmpdir$ + "nm_output_" + StrReplace$(StrReplace$(libfile, pathsep$, "."), ":", ".") + ".txt"
+    If dynamic Then dyn$ = "_dynamic" Else dyn$ = ""
+
+    MakeNMOutputFilename$ = tmpdir$ + "nm_output_" + StrReplace$(StrReplace$(libfile, pathsep$, "."), ":", ".") + dyn$ + ".txt"
 END FUNCTION

tests/compile_tests/declare_library_external/test_stripped.bas

@@ -0,0 +1,23 @@
+$CONSOLE:ONLY
+
+$IF LNX THEN
+
+' This file is missing the regular symbol table and only contains the dynamic symbol table
+DECLARE LIBRARY "./libstripped"
+    FUNCTION add_values&(BYVAL v1 AS LONG, BYVAL v2 as LONG)
+END DECLARE
+
+result = add_values&(2, 3)
+PRINT result
+
+
+$ELSE
+
+' Windows can't use regular DECLARE LIBRARY to link against a dll, just skip this test
+'
+' Mac OS dylib files don't have a dynamic symbol table, so also nothing to test
+PRINT 5
+
+$END IF
+
+SYSTEM

tests/compile_tests/declare_library_external/test_stripped.output

@@ -0,0 +1 @@
+ 5