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#! /bin/sh
# Fix struct exception in /usr/include/math.h.
#
# We expect several systems which did not need fixincludes in the past
# to need to fix just math.h. So we created a separate fixinc.math
# script to fix just that problem.
# See README-fixinc for more information.
# Directory containing the original header files.
# (This was named INCLUDES, but that conflicts with a name in Makefile.in.)
INPUT=${2-${INPUT-/usr/include}}
# Directory in which to store the results.
LIB=${1?"fixincludes: output directory not specified"}
# Make sure it exists.
if [ ! -d $LIB ]; then
mkdir $LIB || exit 1
fi
echo Building fixed headers in ${LIB}
# Some math.h files define struct exception, which conflicts with
# the class exception defined in the C++ file std/stdexcept.h. We
# redefine it to __math_exception. This is not a great fix, but I
# haven't been able to think of anything better.
file=math.h
if [ -r $INPUT/$file ]; then
echo Checking $INPUT/$file
if grep 'struct exception' $INPUT/$file >/dev/null
then
echo Fixed $file
rm -f $LIB/$file
cat <<'__EOF__' >$LIB/$file
#ifndef _MATH_H_WRAPPER
#ifdef __cplusplus
# define exception __math_exception
#endif
#include_next <math.h>
#ifdef __cplusplus
# undef exception
#endif
#define _MATH_H_WRAPPER
#endif /* _MATH_H_WRAPPER */
__EOF__
# Define _MATH_H_WRAPPER at the end of the wrapper, not the start,
# so that if #include_next gets another instance of the wrapper,
# this will follow the #include_next chain until we arrive at
# the real <math.h>.
chmod a+r $LIB/$file
fi
fi
exit 0
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