gcc/fixinc.math

   1 #! /bin/sh
   2 # Fix struct exception in /usr/include/math.h.
   3 #
   4 # We expect several systems which did not need fixincludes in the past
   5 # to need to fix just math.h.  So we created a separate fixinc.math
   6 # script to fix just that problem.
   7 # See README-fixinc for more information.
   8
   9 # Directory containing the original header files.
  10 # (This was named INCLUDES, but that conflicts with a name in Makefile.in.)
  11 INPUT=${2-${INPUT-/usr/include}}
  12
  13 # Directory in which to store the results.
  14 LIB=${1?"fixincludes: output directory not specified"}
  15
  16 # Make sure it exists.
  17 if [ ! -d $LIB ]; then
  18   mkdir $LIB || exit 1
  19 fi
  20
  21 echo Building fixed headers in ${LIB}
  22
  23 # Some math.h files define struct exception, which conflicts with
  24 # the class exception defined in the C++ file std/stdexcept.h.  We
  25 # redefine it to __math_exception.  This is not a great fix, but I
  26 # haven't been able to think of anything better.
  27 file=math.h
  28 if [ -r $INPUT/$file ]; then
  29   echo Checking $INPUT/$file
  30   if grep 'struct exception' $INPUT/$file >/dev/null
  31   then
  32     echo Fixed $file
  33     rm -f $LIB/$file
  34     cat <<'__EOF__' >$LIB/$file
  35 #ifndef _MATH_H_WRAPPER
  36 #ifdef __cplusplus
  37 # define exception __math_exception
  38 #endif
  39 #include_next <math.h>
  40 #ifdef __cplusplus
  41 # undef exception
  42 #endif
  43 #define _MATH_H_WRAPPER
  44 #endif /* _MATH_H_WRAPPER */
  45 __EOF__
  46     # Define _MATH_H_WRAPPER at the end of the wrapper, not the start,
  47     # so that if #include_next gets another instance of the wrapper,
  48     # this will follow the #include_next chain until we arrive at
  49     # the real <math.h>.
  50     chmod a+r $LIB/$file
  51   fi
  52 fi
  53 exit 0