lib/dummy.c

   1 /* A dummy file, to prevent empty libraries from breaking builds.
   2    Copyright (C) 2004, 2007, 2009-2019 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Some systems, reportedly OpenBSD and Mac OS X, refuse to create
  18    libraries without any object files.  You might get an error like:
  19
  20    > ar cru .libs/libgl.a
  21    > ar: no archive members specified
  22
  23    Compiling this file, and adding its object file to the library, will
  24    prevent the library from being empty.  */
  25
  26 /* Some systems, such as Solaris with cc 5.0, refuse to work with libraries
  27    that don't export any symbol.  You might get an error like:
  28
  29    > cc ... libgnu.a
  30    > ild: (bad file) garbled symbol table in archive ../gllib/libgnu.a
  31
  32    Compiling this file, and adding its object file to the library, will
  33    prevent the library from exporting no symbols.  */
  34
  35 #ifdef __sun
  36 /* This declaration ensures that the library will export at least 1 symbol.  */
  37 int gl_dummy_symbol;
  38 #else
  39 /* This declaration is solely to ensure that after preprocessing
  40    this file is never empty.  */
  41 typedef int dummy;
  42 #endif