Subversion Repositories QNX 8.QNX8 linker driver

// QNX 8.0 'gcc' linker driver drop-in replacement by Pierre-Marie Baty <pm@pmbaty.com>

// RATIONALE

// until a proper QNXToolchain class is implemented in the Clang driver, Clang relies on GNU GCC to drive the system linker 'ld'.

// So we *HAVE* to provide a 'gcc' executable for Clang to be able to link QNX files.

// GNU GCC is itself a driver which can also invoke a compiler or a linker (gcc invokes collect2 which in turn invokes ld).

// This means our GCC will need to either chain-call 'clang' when it is called for *compiling* and chain-call 'ld' when it is called for *linking*.

// When proper support is added to it, GNU GCC contains a linker specification for the system which it uses to construct the linker command line.

// The linker specifications for QNX 8.0 can be extracted from '<target triple>-gcc -dumpspecs' and have been reimplemented in this file.

// The GNU specs language is documented here: https://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html

// environment variables:

//   DEBUG_LINKER_DRIVER - when defined to any value (incl. empty string), print the constructed command line to stderr before calling the linker.

#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <stdbool.h>

#include <string.h>

#include <fcntl.h>

#ifndef _WIN32

#include <unistd.h>

#else // _WIN32

#include <process.h>

#include <io.h>

#define strdup(s) _strdup ((s))

#define strcasecmp(a,b) _stricmp ((a), (b))

#define access(f,m) _access ((f), (m))

#define execvpe(exename,argv,envp) exit ((int) _spawnvpe (P_WAIT, (exename), (argv), (envp)))

int vasprintf (char **out_string, const char *fmt, va_list va_args) // vasprintf() implementation

{

   int retval; va_list ap;

   *out_string = (char *) malloc (16); if (*out_string == NULL) return (-1);

   va_copy (ap, va_args); retval = vsnprintf (*out_string, 16, fmt, ap); va_end (ap); if (retval == -1) return (-1);

   if (retval >= 16)

   {

      void *new_string = realloc (*out_string, (size_t) retval + 1); if (new_string == NULL) return (-1); *out_string = (char *) new_string;

      va_copy (ap, va_args); retval = vsnprintf (*out_string, (size_t) retval + 1, fmt, va_args); va_end (ap);

   }

   return (retval);

}

int asprintf (char **out_string, const char *fmt, ...) { int retval; va_list ap; va_start (ap, fmt); retval = vasprintf (out_string, fmt, ap); va_end (ap); return (retval); } // asprintf() implementation

#endif // !_WIN32

#define BASEVER "12.2.0"

#if (defined(__x86_64__) || defined(_WIN64))

#define IS_TARGET_INTEL 1

#define TARGET_TRIPLE "x86_64-pc-nto-qnx8.0.0"

#elif defined(__aarch64__)

#define IS_TARGET_INTEL 0

#define TARGET_TRIPLE "aarch64-unknown-nto-qnx8.0.0"

#else

#error unsupported platform (not x86_64, not aarch64le). Please implement!

#endif

#define COMPILER "clang"

#define LINKER TARGET_TRIPLE "-ld"

#define ARGMODE_SINGLE   0

#define ARGMODE_HASVAL   1

#define ARGMODE_EQUALVAL 2

char *array_contains (int argc, char **argv, char *needle, int mode)

{

   char *arg;

   int arg_index;

   size_t needle_len = strlen (needle);

   for (arg_index = 1; arg_index < argc; arg_index++)

   {

      arg = argv[arg_index];

      if (mode == ARGMODE_SINGLE)

      {

         if (strcmp (arg, needle) == 0)

            return ("");

      }

      else if (mode == ARGMODE_HASVAL)

      {

         if ((arg_index + 1 < argc) && (strcmp (arg, needle) == 0))

            return (argv[arg_index + 1]);

         else if ((strncmp (arg, needle, needle_len) == 0) && (arg[needle_len] != 0))

            return (&arg[needle_len]);

      }

      else if (mode == ARGMODE_EQUALVAL)

      {

         if ((strncmp (arg, needle, needle_len) == 0) && (arg[needle_len] == '='))

            return (&arg[needle_len + 1]);

      }

   }

   return (NULL);

}

char *resolve_envvars (char *str)

{

   char *out_str = strdup (str), *new_str;

   char *varstart, *varstop, *varval;

   while ((varstart = strstr (out_str, "${")) != NULL)

   {

      *varstart = 0;

      varstart += 2;

      varstop = strchr (varstart, '}');

      *varstop = 0;

      varval = getenv (varstart);

      asprintf (&new_str, "%s%s%s", out_str, (varval != NULL ? varval : ""), varstop + 1);

      free (out_str);

      out_str = new_str;

   }

   return (out_str);

}

char *makefmtstr (const char *fmt, ...)

{

   va_list ap;

   char *outstr = NULL;

   va_start (ap, fmt);

   vasprintf (&outstr, fmt, ap);

   va_end (ap);

   return (outstr);

}

int main (int argc, char **argv, char **envp)

{

   #define ADD_CHAR_ARRAY(array_var,arraysize_var,val) do { \

      void *reallocated_ptr = realloc (array_var, (arraysize_var + 2) * sizeof (char *)); \

      if (reallocated_ptr == NULL) exit (1); \

      array_var = reallocated_ptr; \

      array_var[arraysize_var] = (val); \

      array_var[arraysize_var + 1] = NULL; \

      arraysize_var++; \

   } while (0)

   #define ADD_LINKER_ARG(val) ADD_CHAR_ARRAY (linker_argv, linker_argc, (val))

   #define ADD_L_ARG(val) ADD_CHAR_ARRAY (largs, larg_count, (val))

   #define ADD_O_ARG(val) ADD_CHAR_ARRAY (oargs, oarg_count, (val))

   #define ADD_S_ARG(val) ADD_CHAR_ARRAY (sargs, sarg_count, (val))

   #define ARGV_CONTAINS_SINGLEARG(val)       ((arg = array_contains (argc, argv, (val), ARGMODE_SINGLE))   != NULL)

   #define ARGV_CONTAINS_ARGWITHVAL(val)      ((arg = array_contains (argc, argv, (val), ARGMODE_HASVAL))   != NULL)

   #define ARGV_CONTAINS_ARGWITHEQUALVAL(val) ((arg = array_contains (argc, argv, (val), ARGMODE_EQUALVAL)) != NULL)

   #define ARGV_SINGLEARG(val)       array_contains (argc, argv, (val), ARGMODE_SINGLE)

   #define ARGV_ARGWITHVAL(val)      array_contains (argc, argv, (val), ARGMODE_HASVAL)

   #define ARGV_ARGWITHEQUALVAL(val) array_contains (argc, argv, (val), ARGMODE_EQUALVAL)

   static char filebuf[1024 * 1024];

   char **linker_argv = NULL;

   size_t linker_argc = 0;

   char **largs = NULL; // array of "-lxxx" arguments

   size_t larg_count = 0;

   char **sargs = NULL; // array of source files arguments

   size_t sarg_count = 0;

   char **oargs = NULL; // array of object files arguments

   size_t oarg_count = 0;

   size_t read_count;

   size_t byte_index;

   bool was_cpluspluslib_included = false;

   bool requires_libcplusplus = false;

   int arg_index;

   char *arg;

   FILE *fp;

   // if *any* of these flags are present, it means we don't want to link anything, so direct everything to the compiler

   if (   ARGV_CONTAINS_SINGLEARG ("-fsyntax-only")

       || ARGV_CONTAINS_SINGLEARG ("-c")

       || ARGV_CONTAINS_SINGLEARG ("-M")

       || ARGV_CONTAINS_SINGLEARG ("-MM")

       || ARGV_CONTAINS_SINGLEARG ("-E")

       || ARGV_CONTAINS_SINGLEARG ("-S"))

      execvpe (COMPILER, argv, envp); // by leaving argv[0] untouched, we will be invoking Clang as 'gcc', which will give it a supplemental hint about how to behave

   // collect source and object files in two separate lists

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strcmp (argv[arg_index - 1], "-o") != 0) // this arg is NOT preceded by "-o"...

          && (access (argv[arg_index], 0) == 0) // ... this arg is an existing file...

          && ((arg = strrchr (argv[arg_index], '.')) != NULL)) // this filename has an extension (FIXME: what if "-x <language>" is specified?)

      {

         if (   (strcasecmp (arg, ".s") == 0)

             || (strcasecmp (arg, ".c") == 0)

             || (strcasecmp (arg, ".cc") == 0)

             || (strcasecmp (arg, ".c++") == 0)

             || (strcasecmp (arg, ".cpp") == 0)

             || (strcasecmp (arg, ".cxx") == 0)

             || (strcasecmp (arg, ".m") == 0)

             || (strcasecmp (arg, ".mm") == 0)

             || (strcasecmp (arg, ".mxx") == 0))

            ADD_S_ARG (argv[arg_index]); // this file is one of the known source file extensions: add to source files list

         else

            ADD_O_ARG (argv[arg_index]); // this file is NOT one of the known file extensions: add to object files list

      }

   // if we have zero .o file, OR if we have some source files, we have to compile first

   if ((sarg_count > 0) || (oarg_count == 0))

      execvpe (COMPILER, argv, envp); // by leaving argv[0] untouched, we will be invoking Clang as 'gcc', which will give it a supplemental hint about how to behave

   // collect -l flags

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strncmp (argv[arg_index], "-l", 2) == 0) && ((argv[arg_index])[2] != 0))

         ADD_L_ARG (argv[arg_index]);

   //   LINKER " "

   ADD_LINKER_ARG (LINKER);

   //   "%{!fno-use-linker-plugin:"

   //           "%{!fno-lto:     "

   //                   "-plugin ${QNX_HOST}/usr/lib/gcc/" TARGET_TRIPLE "/" BASEVER "/liblto_plugin.so     "

   //                   "-plugin-opt=${QNX_HOST}/usr/lib/gcc/" TARGET_TRIPLE "/" BASEVER "/lto-wrapper     "

   //                   "-plugin-opt=-fresolution=%u.res         "

   //                   "%{flinker-output=*:"   "-plugin-opt=-linker-output-known"      "}     "

   //                   "%{!nostdlib:"

   //                           "%{!nodefaultlibs:"     "%:pass-through-libs(%(link_gcc_c_sequence))"   "}"

   //                   "}     "

   //           "}"

   //   "}"

   if (!ARGV_CONTAINS_SINGLEARG ("-fno-use-linker-plugin") && !ARGV_CONTAINS_SINGLEARG ("-fno-lto"))

   {

      /*ADD_LINKER_ARG ("-plugin");

      ADD_LINKER_ARG (resolve_envvars ("${QNX_HOST}/usr/lib/gcc/" TARGET_TRIPLE "/" BASEVER "/liblto_plugin.so"));

      ADD_LINKER_ARG (resolve_envvars ("-plugin-opt=${QNX_HOST}/usr/lib/gcc/" TARGET_TRIPLE "/" BASEVER "/lto-wrapper"));

      ADD_LINKER_ARG (makefmtstr ("-plugin-opt=-fresolution=%s.res", "TODO-UNKNOWN")); // LTO is not interoperable between clang and ld. See below.

      if (ARGV_CONTAINS_ARGWITHEQUALVAL ("-flinker-output"))

         ADD_LINKER_ARG ("-plugin-opt=-linker-output-known");

      if (!ARGV_CONTAINS_SINGLEARG ("-nostdlib") && !ARGV_CONTAINS_SINGLEARG ("-nodefaultlibs"))

         for (arg_index = 0; arg_index < larg_count; arg_index++)

            ADD_LINKER_ARG (makefmtstr ("-plugin-opt=-pass-through=%s", largs[arg_index]));*/

      // looks like LTO is a no-go. See: https://stackoverflow.com/questions/51259340/interoperability-between-clang-gcc-and-lto

   }

   //   "%{flto|flto=*:"        "%<fcompare-debug*"     "}     "

   if (ARGV_CONTAINS_SINGLEARG ("-flto") || ARGV_CONTAINS_ARGWITHEQUALVAL ("-flto"))

      for (arg_index = 1; arg_index < argc; arg_index++)

         if (strncmp (argv[arg_index], "-fcompare-debug", 15) == 0)

            argv[arg_index] = ""; // remove this arg

   if (ARGV_CONTAINS_SINGLEARG ("-flto"))       ADD_LINKER_ARG ("-flto");                    // "%{flto} "

   if (ARGV_CONTAINS_SINGLEARG ("-fno-lto"))    ADD_LINKER_ARG ("-fno-lto");                 // "%{fno-lto} "

   if (ARGV_CONTAINS_ARGWITHEQUALVAL ("-flto")) ADD_LINKER_ARG (makefmtstr ("-flto=%s", arg)); //       "%{flto=*} "

   //   "%{!static:"    "--eh-frame-hdr"                "} "

   if (!ARGV_CONTAINS_SINGLEARG ("-static")) ADD_LINKER_ARG ("--eh-frame-hdr");

#if IS_TARGET_INTEL

   //   "%{!m32:"       "-m elf_x86_64"                 "} "

   //   "%{m32:"        "-m i386nto"                    "}   "

   ADD_LINKER_ARG ("-m");

   if (ARGV_CONTAINS_SINGLEARG ("-m32"))

      ADD_LINKER_ARG ("i386nto");

   else

      ADD_LINKER_ARG ("elf_x86_64");

#endif // IS_TARGET_INTEL

   //   "%{h*} "

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strcmp (argv[arg_index], "-h") == 0) && (arg_index + 1 < argc))

      {

         ADD_LINKER_ARG ("-h");

         ADD_LINKER_ARG (argv[++arg_index]);

      }

      else if ((strncmp (argv[arg_index], "-h", 2) == 0) && ((argv[arg_index])[2] != 0))

         ADD_LINKER_ARG (argv[arg_index]);

   //   "%{v:"  "-V"    "}   "

   if (ARGV_CONTAINS_SINGLEARG ("-v")) ADD_LINKER_ARG ("-V");

   //   "%{b}   "

   if (ARGV_CONTAINS_SINGLEARG ("-b")) ADD_LINKER_ARG ("-b");

#if !IS_TARGET_INTEL

   //   "%{Wl,*:"       "%*"                            "}  "

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strcmp (argv[arg_index], "-Wl,") == 0) && (arg_index + 1 < argc))

         ADD_LINKER_ARG (argv[++arg_index]);

      else if ((strncmp (argv[arg_index], "-Wl,", 4) == 0) && ((argv[arg_index])[4] != 0))

         ADD_LINKER_ARG (argv[arg_index] + 4);

#endif // !IS_TARGET_INTEL

   //   "%{!r:"         "--build-id=md5"                "}   "

   if (!ARGV_CONTAINS_SINGLEARG ("-r")) ADD_LINKER_ARG ("--build-id=md5");

   //   "--warn-shared-textrel   "

   //   "-zrelro "

   //   "-znow   "

   ADD_LINKER_ARG ("--warn-shared-textrel");

   ADD_LINKER_ARG ("-zrelro");

   ADD_LINKER_ARG ("-znow");

#if IS_TARGET_INTEL

   //   "%{shared:"     "-G -dy -z text"                "}   "

   if (ARGV_CONTAINS_SINGLEARG ("-shared"))

   {

      ADD_LINKER_ARG ("-G");

      ADD_LINKER_ARG ("-dy");

      ADD_LINKER_ARG ("-z");

      ADD_LINKER_ARG ("text");

   }

   //   "%{symbolic:"   "-Bsymbolic -G -dy -z text"     "}   "

   if (ARGV_CONTAINS_SINGLEARG ("-symbolic"))

   {

      ADD_LINKER_ARG ("-Bsymbolic");

      ADD_LINKER_ARG ("-G");

      ADD_LINKER_ARG ("-dy");

      ADD_LINKER_ARG ("-z");

      ADD_LINKER_ARG ("text");

   }

   //   "%{G:"          "-G"                            "}   "

   if (ARGV_CONTAINS_SINGLEARG ("-G")) ADD_LINKER_ARG ("-G");

   //   "%{shared:"     "-shared"                       "}   "

   //   "%{!shared:     "

   //           "%{!static:       "

   //                   "%{rdynamic:"   "-export-dynamic"               "}       "

   //                   "%{m32:"

   //                           "%{!dynamic-linker:"    "-dynamic-linker /usr/lib/ldqnx.so.2"           "}"

   //                   "}       "

   //                   "%{!m32:"

   //                           "%{!dynamic-linker:"    "-dynamic-linker /usr/lib/ldqnx-64.so.2"        "}"

   //                   "}"

   //           "}     "

   //           "%{static:"     "-static"                                                               "}"

   //   "} "

   if (ARGV_CONTAINS_SINGLEARG ("-shared"))

      ADD_LINKER_ARG ("-shared");

   else if (ARGV_CONTAINS_SINGLEARG ("-static"))

      ADD_LINKER_ARG ("-static");

   else

   {

      if (ARGV_CONTAINS_SINGLEARG ("-rdynamic"))

         ADD_LINKER_ARG ("-export-dynamic");

      if (!ARGV_CONTAINS_SINGLEARG ("-dynamic-linker"))

      {

         ADD_LINKER_ARG ("-dynamic-linker");

         if (ARGV_CONTAINS_SINGLEARG ("-m32"))

            ADD_LINKER_ARG ("/usr/lib/ldqnx.so.2");

         else // not -m32

            ADD_LINKER_ARG ("/usr/lib/ldqnx-64.so.2");

      }

   }

#else // !IS_TARGET_INTEL

   //   "%{static:"     "-Bstatic"                      "}  "

   if (ARGV_CONTAINS_SINGLEARG ("-static")) ADD_LINKER_ARG ("-Bstatic");

   //   "%{shared}  "

   if (ARGV_CONTAINS_SINGLEARG ("-shared")) ADD_LINKER_ARG ("-shared");

   //   "%{symbolic:"   "-Bsymbolic"                    "}  "

   if (ARGV_CONTAINS_SINGLEARG ("-symbolic")) ADD_LINKER_ARG ("-Bsymbolic");

   //   "%{G:"          "-G"                            "} "

   if (ARGV_CONTAINS_SINGLEARG ("-G")) ADD_LINKER_ARG ("-G");

   //   "%{MAP:"        "-Map mapfile"                  "}  "

   if (ARGV_CONTAINS_SINGLEARG ("-MAP"))

   {

      ADD_LINKER_ARG ("-Map");

      ADD_LINKER_ARG ("mapfile");

   }

   //   "%{!shared:    "

   //           "%{!static:      "

   //                   "%{rdynamic:"   "-export-dynamic"               "}"

   //           "}    "

   //           "--dynamic-linker /usr/lib/ldqnx-64.so.2"

   //   "}  "

   if (!ARGV_CONTAINS_SINGLEARG ("-shared"))

   {

      if (!ARGV_CONTAINS_SINGLEARG ("-static") && ARGV_CONTAINS_SINGLEARG ("-rdynamic"))

         ADD_LINKER_ARG ("-export-dynamic");

      ADD_LINKER_ARG ("--dynamic-linker");

      ADD_LINKER_ARG ("/usr/lib/ldqnx-64.so.2");

   }

   //   "-X "

   ADD_LINKER_ARG ("-X");

   //   "%{EB:"         "-EB"                           "} "

   //   "%{!EB:"        "-EL"                           "} "

   if (ARGV_CONTAINS_SINGLEARG ("-EB"))

      ADD_LINKER_ARG ("-EB");

   else

      ADD_LINKER_ARG ("-EL");

   //   "%{EL:"         "-EL"                           "} "

   if (ARGV_CONTAINS_SINGLEARG ("-EL"))

      ADD_LINKER_ARG ("-EL");

#endif // IS_TARGET_INTEL

   //   "%{static|shared|r:;!no-pie:"   "-pie"                                                          "} "

   if (ARGV_CONTAINS_SINGLEARG ("-static") || !ARGV_CONTAINS_SINGLEARG ("-shared") || !ARGV_CONTAINS_SINGLEARG ("-r"))

      ; // nothing to do

   else if (!ARGV_CONTAINS_SINGLEARG ("-no-pie"))

      ADD_LINKER_ARG ("-pie");

   //   "%{fuse-ld=*:"                  "-fuse-ld=%*"                                                                   "} "

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strncmp (argv[arg_index], "-fuse-ld=", 9) == 0) && ((argv[arg_index])[9] != 0))

         ADD_LINKER_ARG (argv[arg_index]);

   //   "%{gz|gz=zlib:"         "--compress-debug-sections=zlib"                        "} "

   //   "%{gz=none:"                    "--compress-debug-sections=none"                        "} "

   //   "%{gz=zlib-gnu:"                "--compress-debug-sections=zlib-gnu"    "} "

   if (ARGV_CONTAINS_SINGLEARG ("-gz") || ARGV_CONTAINS_SINGLEARG ("-gz=zlib"))

      ADD_LINKER_ARG ("--compress-debug-sections=zlib");

   if (ARGV_CONTAINS_SINGLEARG ("-gz=none"))

      ADD_LINKER_ARG ("--compress-debug-sections=none");

   if (ARGV_CONTAINS_SINGLEARG ("-gz=zlib-gnu"))

      ADD_LINKER_ARG ("--compress-debug-sections=zlib-gnu");

   //   "%X "

   // nothing to do (nothing was accumulated by %x previously)

   //   "%{o*} "

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strcmp (argv[arg_index], "-o") == 0) && (arg_index + 1 < argc))

      {

         ADD_LINKER_ARG ("-o");

         ADD_LINKER_ARG (argv[++arg_index]);

      }

      else if ((strncmp (argv[arg_index], "-o", 2) == 0) && ((argv[arg_index])[2] != 0))

         ADD_LINKER_ARG (argv[arg_index]);

   //   "%{e*} "

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strcmp (argv[arg_index], "-e") == 0) && (arg_index + 1 < argc))

      {

         ADD_LINKER_ARG ("-e");

         ADD_LINKER_ARG (argv[++arg_index]);

      }

      else if ((strncmp (argv[arg_index], "-e", 2) == 0) && ((argv[arg_index])[2] != 0))

         ADD_LINKER_ARG (argv[arg_index]);

   //   "%{N} "

   //   "%{n} "

   //   "%{r}    "

   //   "%{s} "

   //   "%{t} "

   if (ARGV_CONTAINS_SINGLEARG ("-N")) ADD_LINKER_ARG ("-N");

   if (ARGV_CONTAINS_SINGLEARG ("-n")) ADD_LINKER_ARG ("-n");

   if (ARGV_CONTAINS_SINGLEARG ("-r")) ADD_LINKER_ARG ("-r");

   if (ARGV_CONTAINS_SINGLEARG ("-s")) ADD_LINKER_ARG ("-s");

   if (ARGV_CONTAINS_SINGLEARG ("-t")) ADD_LINKER_ARG ("-t");

   //   "%{u*} "

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strcmp (argv[arg_index], "-u") == 0) && (arg_index + 1 < argc))

      {

         ADD_LINKER_ARG ("-u");

         ADD_LINKER_ARG (argv[++arg_index]);

      }

      else if ((strncmp (argv[arg_index], "-u", 2) == 0) && ((argv[arg_index])[2] != 0))

         ADD_LINKER_ARG (argv[arg_index]);

   //   "%{z} "

   //   "%{Z} "

   if (ARGV_CONTAINS_SINGLEARG ("-z")) ADD_LINKER_ARG ("-z");

   if (ARGV_CONTAINS_SINGLEARG ("-Z")) ADD_LINKER_ARG ("-Z");

   //   "%{!nostdlib:"

   //           "%{!r:"

   //                   "%{!nostartfiles:"      "%S"    "}"

   //           "}"

   //   "}     "

   if (!ARGV_CONTAINS_SINGLEARG ("-nostdlib") && !ARGV_CONTAINS_SINGLEARG ("-r") && !ARGV_CONTAINS_SINGLEARG ("-nostartfiles"))

   {

#if IS_TARGET_INTEL // Intel variant

      //        "%{!shared:   "

      //                "%{!symbolic:     "

      //                        "%{pg:       "

      //                                "%{m32:"        " %${QNX_TARGET}/x86/lib/mcrt1.o%s"     "}       "

      //                                "%{!m32:"       " %${QNX_TARGET}/x86_64/lib/mcrt1.o%s"  "}"

      //                        "}     "

      //                        "%{!pg:       "

      //                                "%{p:        "

      //                                        "%{m32:"        " %${QNX_TARGET}/x86/lib/mcrt1.o%s"     "}        "

      //                                        "%{!m32:"       " %${QNX_TARGET}/x86_64/lib/mcrt1.o%s"  "}"

      //                                "}"

      //                        "}     "

      //                        "%{!p: "

      //                                "%{!pg:        "

      //                                        "%{m32:"        " %${QNX_TARGET}/x86/lib/crt1%{!no-pie:S}.o%s"  "}        "

      //                                        "%{!m32:"       " %${QNX_TARGET}/x86_64/lib/crt1.o%s"   "}"

      //                                "}"

      //                        "}     "

      //                "}"

      //        "}     "

      if (!ARGV_CONTAINS_SINGLEARG ("-shared") && !ARGV_CONTAINS_SINGLEARG ("-symbolic"))

      {

         if (ARGV_CONTAINS_SINGLEARG ("-pg") || ARGV_CONTAINS_SINGLEARG ("-p"))

         {

            if (ARGV_CONTAINS_SINGLEARG ("-m32"))

               ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/x86/lib/mcrt1.o"));

            else

               ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/x86_64/lib/mcrt1.o"));

         }

         else // neither "-pg" nor "-p"

         {

            if (ARGV_CONTAINS_SINGLEARG ("-m32"))

               ADD_LINKER_ARG (resolve_envvars (makefmtstr ("${QNX_TARGET}/x86/lib/crt1%s.o", ARGV_CONTAINS_SINGLEARG ("-no-pie") ? "" : "S")));

            else

               ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/x86_64/lib/crt1.o"));

         }

      }

      //        "%{m32:"        " %${QNX_TARGET}/x86/lib/crti.o%s"      "}     "

      //        "%{!m32:"       " %${QNX_TARGET}/x86_64/lib/crti.o%s"   "}     "

      if (ARGV_CONTAINS_SINGLEARG ("-m32"))

         ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/x86/lib/crti.o"));

      else

         ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/x86_64/lib/crti.o"));

#else // !IS_TARGET_INTEL

      //        "%{!shared: %${QNX_TARGET}/aarch64%{EB:be}%{!EB:le}/lib/%{pg:m}%{p:m}crt1.o } "

      if (ARGV_CONTAINS_SINGLEARG ("-shared"))

         if (ARGV_CONTAINS_SINGLEARG ("-EB"))

            ADD_LINKER_ARG (resolve_envvars (makefmtstr ("${QNX_TARGET}/aarch64be/lib/%scrt1.o", ARGV_CONTAINS_SINGLEARG ("-pg") || ARGV_CONTAINS_SINGLEARG ("-p") ? "m" : "")));

         else

            ADD_LINKER_ARG (resolve_envvars (makefmtstr ("${QNX_TARGET}/aarch64le/lib/%scrt1.o", ARGV_CONTAINS_SINGLEARG ("-pg") || ARGV_CONTAINS_SINGLEARG ("-p") ? "m" : "")));

      //        "%${QNX_TARGET}/aarch64%{EB:be}%{!EB:le}/lib/crti.o "

      if (ARGV_CONTAINS_SINGLEARG ("-EB"))

         ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/aarch64be/lib/crti.o"));

      else

         ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/aarch64le/lib/crti.o"));

#endif // IS_TARGET_INTEL

      //        "crtbegin.o%s "

      ADD_LINKER_ARG (resolve_envvars ("${QNX_HOST}/usr/bin/../lib/gcc/" TARGET_TRIPLE "/" BASEVER "/crtbegin.o"));

   }

   //   "%{static|no-pie|static-pie:"                                   "} "

   // nothing to do

   //   "%@{L*} "

   for (arg_index = 1; arg_index < argc; arg_index++)

      if ((strcmp (argv[arg_index], "-L") == 0) && (arg_index + 1 < argc))

      {

         ADD_LINKER_ARG ("-L");

         ADD_LINKER_ARG (argv[++arg_index]);

      }

      else if ((strncmp (argv[arg_index], "-L", 2) == 0) && ((argv[arg_index])[2] != 0))

         ADD_LINKER_ARG (argv[arg_index]);

   //   "%(mfwrap) "

   // nothing to do (looks like the libmudflap wrap spec has been officially removed from this version of GCC, except for uCLinux)

   //   "-L${QNX_HOST}/usr/bin/../lib/gcc/" TARGET_TRIPLE "/" BASEVER

   //   "-L${QNX_HOST}/usr/bin/../lib/gcc"

   ADD_LINKER_ARG (resolve_envvars ("-L${QNX_HOST}/usr/bin/../lib/gcc/" TARGET_TRIPLE "/" BASEVER));

   ADD_LINKER_ARG (resolve_envvars ("-L${QNX_HOST}/usr/bin/../lib/gcc"));

#if IS_TARGET_INTEL

   //   "%{m32:   " \

   //           "-L %${QNX_TARGET}/x86/lib/gcc/" BASEVER "   "

   //           "-L %${QNX_TARGET}/x86/lib   "

   //           "-L %${QNX_TARGET}/x86/usr/lib   "

   //           "-L %${QNX_TARGET}/x86/opt/lib   "

   //           "-rpath-link %${QNX_TARGET}/x86/lib/gcc/" BASEVER ":%${QNX_TARGET}/x86/lib:%${QNX_TARGET}/x86/usr/lib:%${QNX_TARGET}/x86/opt/lib"

   //   "}  "

   //   "%{!m32:   "

   //           "-L %${QNX_TARGET}/x86_64/lib/gcc/" BASEVER "   "

   //           "-L %${QNX_TARGET}/x86_64/lib   "

   //           "-L %${QNX_TARGET}/x86_64/usr/lib   "

   //           "-L %${QNX_TARGET}/x86_64/opt/lib   "

   //           "-rpath-link %${QNX_TARGET}/x86_64/lib/gcc/" BASEVER ":%${QNX_TARGET}/x86_64/lib:%${QNX_TARGET}/x86_64/usr/lib:%${QNX_TARGET}/x86_64/opt/lib"

   //   "} "

   if (ARGV_CONTAINS_SINGLEARG ("-m32"))

   {

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/x86/lib/gcc/" BASEVER));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/x86/lib"));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/x86/usr/lib"));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/x86/opt/lib"));

      ADD_LINKER_ARG ("-rpath-link");

      ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/x86/lib/gcc/" BASEVER ":${QNX_TARGET}/x86/lib" ":${QNX_TARGET}/x86/usr/lib" ":${QNX_TARGET}/x86/opt/lib"));

   }

   else

   {

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/x86_64/lib/gcc/" BASEVER));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/x86_64/lib"));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/x86_64/usr/lib"));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/x86_64/opt/lib"));

      ADD_LINKER_ARG ("-rpath-link");

      ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/x86_64/lib/gcc/" BASEVER ":${QNX_TARGET}/x86_64/lib:${QNX_TARGET}/x86_64/usr/lib:${QNX_TARGET}/x86_64/opt/lib"));

   }

#else // !IS_TARGET_INTEL

   //   "-L %${QNX_TARGET}/aarch64%{EB:be}%{!EB:le}/lib/gcc/" BASEVER "  "

   //   "-L %${QNX_TARGET}/aarch64%{EB:be}%{!EB:le}/lib  "

   //   "-L %${QNX_TARGET}/aarch64%{EB:be}%{!EB:le}/usr/lib  "

   //   "-L %${QNX_TARGET}/aarch64%{EB:be}%{!EB:le}/opt/lib  "

   if (ARGV_CONTAINS_SINGLEARG ("-EB"))

   {

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/aarch64be/lib/gcc/" BASEVER));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/aarch64be/lib"));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/aarch64be/usr/lib"));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/aarch64be/opt/lib"));

      ADD_LINKER_ARG ("-rpath-link");

      ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/aarch64be/lib/gcc/" BASEVER ":${QNX_TARGET}/aarch64be/lib" ":${QNX_TARGET}/aarch64be/usr/lib" ":${QNX_TARGET}/aarch64be/opt/lib"));

   }

   else

   {

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/aarch64le/lib/gcc/" BASEVER));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/aarch64le/lib"));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/aarch64le/usr/lib"));

      ADD_LINKER_ARG (resolve_envvars ("-L${QNX_TARGET}/aarch64le/opt/lib"));

      ADD_LINKER_ARG ("-rpath-link");

      ADD_LINKER_ARG (resolve_envvars ("${QNX_TARGET}/aarch64le/lib/gcc/" BASEVER ":${QNX_TARGET}/aarch64le/lib" ":${QNX_TARGET}/aarch64le/usr/lib" ":${QNX_TARGET}/aarch64le/opt/lib"));

   }

#endif // IS_TARGET_INTEL

   //   "%{!nostdlib:"

   //           "%{!r:"

   //                   "%{fvtable-verify=std:"         " -lvtv -u_vtable_map_vars_start -u_vtable_map_vars_end"        "}    "

   //                   "%{fvtable-verify=preinit:"     " -lvtv -u_vtable_map_vars_start -u_vtable_map_vars_end"        "}"

   //           "}"

   //   "} "

   if (!ARGV_CONTAINS_SINGLEARG ("-nostdlib") && !ARGV_CONTAINS_SINGLEARG ("-r"))

   {

      if (ARGV_CONTAINS_SINGLEARG ("-fvtable-verify=std") || ARGV_CONTAINS_SINGLEARG ("-fvtable-verify=preinit"))

      {

         ADD_LINKER_ARG ("-lvtv");

         ADD_LINKER_ARG ("-u_vtable_map_vars_start");

         ADD_LINKER_ARG ("-u_vtable_map_vars_end");

      }

      //        "%{!nodefaultlibs:"

      if (!ARGV_CONTAINS_SINGLEARG ("-nodefaultlibs"))

      {

#if IS_TARGET_INTEL

      //                "%{%:sanitize(address):"        "}     "

      //                "%{%:sanitize(hwaddress):"      "}     "

      //                "%{%:sanitize(thread):"         "}     "

      //                "%{%:sanitize(leak):"           "}"

      /* TODO */

#else // !IS_TARGET_INTEL

      //                "%{%:sanitize(address):"

      //                        "%{!shared:"            "libasan_preinit%O%s"                                                                           "} "

      //                        "%{static-libasan:"     "%{!shared:"    "-Bstatic --whole-archive -lasan --no-whole-archive -Bdynamic"          "}"     "}"

      //                        "%{!static-libasan:"    "-lasan"                                                                                        "}"

      //                "}     "

      //                "%{%:sanitize(hwaddress):"

      //                        "%{static-libhwasan:"   "%{!shared:"    "-Bstatic --whole-archive -lhwasan --no-whole-archive -Bdynamic"        "}"     "}"

      //                        "%{!static-libhwasan:"  "-lhwasan"                                                                                      "}"

      //                "}     "

      //                "%{%:sanitize(thread):"

      //                        "%{!shared:"            "libtsan_preinit%O%s"                                                                           "} "

      //                        "%{static-libtsan:"     "%{!shared:"    "-Bstatic --whole-archive -ltsan --no-whole-archive -Bdynamic"          "}"     "}"

      //                        "%{!static-libtsan:"    "-ltsan"                                                                                        "}"

      //                "}     "

      //                "%{%:sanitize(leak):"

      //                        "%{!shared:"            "liblsan_preinit%O%s"                                                                           "} "

      //                        "%{static-liblsan:"     "%{!shared:"    "-Bstatic --whole-archive -llsan --no-whole-archive -Bdynamic"          "}"     "}"

      //                        "%{!static-liblsan:"    "-llsan"                                                                                        "}"

      //                "}"

      /* TODO */

#endif // IS_TARGET_INTEL

      }

   }

   //   "%o      "

   for (arg_index = 0; arg_index < oarg_count; arg_index++)

      ADD_LINKER_ARG (oargs[arg_index]);

   // QUOTE FROM https://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html -- BEGIN

   // "The following example inserts the link_gomp spec if the last -ftree-parallelize-loops= option given on the command line is greater than 1:

   //  %{                 %:gt(%{ftree-parallelize-loops=*:%*} 1):%:include(libgomp.spec)%(link_gomp)}"

   // QUOTE FROM https://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html -- END

   //   "%{fopenacc|fopenmp|%:gt(%{ftree-parallelize-loops=*:%*} 1):%:include(libgomp.spec)%(link_gomp)}    "

   // nothing to do (link_gomp is an empty string in this GCC)

   //   "%{fgnu-tm:"    "%:include(libitm.spec)%(link_itm)"     "}    "

   if (ARGV_CONTAINS_SINGLEARG ("-fgnu-tm"))

   {

      ADD_LINKER_ARG ("-litm");

      ADD_LINKER_ARG ("-lpthread"); // FIXME: possibly wrong

   }

   //   "%(mflib)  "

   // nothing to do (looks like the mflib spec has been officially removed from this version of GCC)

   //   "%{fsplit-stack: "                              "--wrap=pthread_create"         "}    "

   if (ARGV_CONTAINS_SINGLEARG ("-fsplit-stack"))

      ADD_LINKER_ARG ("--wrap=pthread_create");

   //   "%{fprofile-arcs|fprofile-generate*|coverage:"  "-lgcov"                        "} "

   if (ARGV_CONTAINS_SINGLEARG ("-fprofile-arcs") || ARGV_CONTAINS_ARGWITHVAL ("-fprofile-generate") || ARGV_CONTAINS_SINGLEARG ("-coverage"))

      ADD_LINKER_ARG ("-lgcov");

   if (!ARGV_CONTAINS_SINGLEARG ("-nostdlib") && !ARGV_CONTAINS_SINGLEARG ("-r"))

   {

      if (!ARGV_CONTAINS_SINGLEARG ("-nodefaultlibs"))

      {

#if IS_TARGET_INTEL

         //     "%{%:sanitize(address):"

         //             "%{static-libasan:"             "-Bstatic"                                              "} "

         //             "-lasan "

         //             "%{static-libasan:"             "-Bdynamic"                                             "} "

         //             "%{static-libasan|static:"      "%:include(libsanitizer.spec)%(link_libasan)"           "}    "

         //             "%{static:"                     "%ecannot specify -static with -fsanitize=address"      "}"

         //     "}    "

         if (ARGV_CONTAINS_SINGLEARG ("-fsanitize=address"))

         {

            if (ARGV_CONTAINS_SINGLEARG ("-static-libasan")) ADD_LINKER_ARG ("-Bstatic");

            ADD_LINKER_ARG ("-lasan");

            if (ARGV_CONTAINS_SINGLEARG ("-static-libasan")) ADD_LINKER_ARG ("-Bdynamic");

            if (ARGV_CONTAINS_SINGLEARG ("-static-libasan") || ARGV_CONTAINS_SINGLEARG ("-static"))

               ADD_LINKER_ARG ("-lm"); // only known dependency to libasan on QNX

            if (ARGV_CONTAINS_SINGLEARG ("-static"))

            {

               fprintf (stderr, "%s: error: cannot specify -static with -fsanitize=address\n", argv[0]);

               exit (1);

            }

         }

         //     "%{%:sanitize(hwaddress):"

         //             "%{static-libhwasan:"           "-Bstatic"                                              "} "

         //             "-lhwasan "

         //             "%{static-libhwasan:"           "-Bdynamic"                                             "} "

         //             "%{static-libhwasan|static:"    "%:include(libsanitizer.spec)%(link_libhwasan)"         "}      "

         //             "%{static:"                     "%ecannot specify -static with -fsanitize=hwaddress"    "}"

         //     "}    "

         if (ARGV_CONTAINS_SINGLEARG ("-fsanitize=hwaddress"))

         {

            if (ARGV_CONTAINS_SINGLEARG ("-static-libhwasan")) ADD_LINKER_ARG ("-Bstatic");

            ADD_LINKER_ARG ("-lhwasan");

            if (ARGV_CONTAINS_SINGLEARG ("-static-libhwasan")) ADD_LINKER_ARG ("-Bdynamic");

            if (ARGV_CONTAINS_SINGLEARG ("-static-libhwasan") || ARGV_CONTAINS_SINGLEARG ("-static"))

               ADD_LINKER_ARG ("-lm"); // only known dependency to libhwasan on QNX

            if (ARGV_CONTAINS_SINGLEARG ("-static"))

            {

               fprintf (stderr, "%s: error: cannot specify -static with -fsanitize=hwaddress\n", argv[0]);

               exit (1);

            }

         }