/aclocal/gcc-weak.m4

http://rtems-atapi.googlecode.com/ · m4 · 19 lines · 17 code · 2 blank · 0 comment · 0 complexity · 421e562ece8c307e01696a39a71833a5 MD5 · raw file 

    

  1. AC_DEFUN([RTEMS_CHECK_GCC_WEAK],[
    2. 

  2. AC_CACHE_CHECK([whether $CC supports function __attribute__((weak))],
    3. 

  3. [rtems_cv_cc_attribute_weak],[
    4. 

  4.   AS_IF([test x"$GCC" = xyes],[
    5. 

  5.     save_CFLAGS=$CFLAGS
    6. 

  6.     CFLAGS=-Werror])
    7. 

  7. 

  8.   AC_COMPILE_IFELSE([
    9. 

  9.     AC_LANG_PROGRAM(
    10. 

  10.     [void myfunc(char c) __attribute__ ((weak));
    11. 

  11.      void myfunc(char c) {}],
    12. 

  12.     [])],
    13. 

  13.     [rtems_cv_cc_attribute_weak=yes],
    14. 

  14.     [rtems_cv_cc_attribute_weak=no])
    15. 

  15. 

  16.   AS_IF([test x"$GCC" = xyes],[
    17. 

  17.     CFLAGS=$save_CFLAGS])
    18. 

  18. ])
    19. 

  19. ])
    20.