scripts/check-installed-headers.sh

   1 #! /bin/sh
   2 # Copyright (C) 2016-2018 Free Software Foundation, Inc.
   3 # This file is part of the GNU C Library.
   4 #
   5 # The GNU C Library is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU Lesser General Public
   7 # License as published by the Free Software Foundation; either
   8 # version 2.1 of the License, or (at your option) any later version.
   9 #
  10 # The GNU C Library is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # Lesser General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with the GNU C Library; if not, see
  17 # <http://www.gnu.org/licenses/>.
  18
  19 # Check installed headers for cleanliness.  For each header, confirm
  20 # that it's possible to compile a file that includes that header and
  21 # does nothing else, in several different compilation modes.  Also,
  22 # scan the header for a set of obsolete typedefs that should no longer
  23 # appear.
  24
  25 # These compilation switches assume GCC or compatible, which is probably
  26 # fine since we also assume that when _building_ glibc.
  27 c_modes="-std=c89 -std=gnu89 -std=c11 -std=gnu11"
  28 cxx_modes="-std=c++98 -std=gnu++98 -std=c++11 -std=gnu++11"
  29
  30 # An exhaustive test of feature selection macros would take far too long.
  31 # These are probably the most commonly used three.
  32 lib_modes="-D_DEFAULT_SOURCE=1 -D_GNU_SOURCE=1 -D_XOPEN_SOURCE=700"
  33
  34 # sys/types.h+bits/types.h have to define the obsolete types.
  35 # rpc(svc)/* have the obsolete types too deeply embedded in their API
  36 # to remove.
  37 skip_obsolete_type_check='*/sys/types.h|*/bits/types.h|*/rpc/*|*/rpcsvc/*'
  38 obsolete_type_re=\
  39 '\<((__)?(quad_t|u(short|int|long|_(char|short|int([0-9]+_t)?|long|quad_t))))\>'
  40
  41 if [ $# -lt 3 ]; then
  42     echo "usage: $0 c|c++ \"compile command\" header header header..." >&2
  43     exit 2
  44 fi
  45 case "$1" in
  46     (c)
  47         lang_modes="$c_modes"
  48         cih_test_c=$(mktemp ${TMPDIR-/tmp}/cih_test_XXXXXX.c)
  49         already="$skip_obsolete_type_check"
  50     ;;
  51     (c++)
  52         lang_modes="$cxx_modes"
  53         cih_test_c=$(mktemp ${TMPDIR-/tmp}/cih_test_XXXXXX.cc)
  54         # The obsolete-type check can be skipped for C++; it is
  55         # sufficient to do it for C.
  56         already="*"
  57     ;;
  58     (*)
  59         echo "usage: $0 c|c++ \"compile command\" header header header..." >&2
  60         exit 2;;
  61 esac
  62 shift
  63 cc_cmd="$1"
  64 shift
  65 trap "rm -f '$cih_test_c'" 0
  66
  67 failed=0
  68 is_x86_64=unknown
  69 is_x32=unknown
  70 for header in "$@"; do
  71     # Skip various headers for which this test gets a false failure.
  72     case "$header" in
  73         # bits/* are not meant to be included directly and usually #error
  74         # out if you try it.
  75         # regexp.h is a stub containing only an #error.
  76         # Sun RPC's .x files are traditionally installed in
  77         # $prefix/include/rpcsvc, but they are not C header files.
  78         (bits/* | regexp.h | rpcsvc/*.x)
  79             continue;;
  80
  81         # All extant versions of sys/elf.h contain nothing more than an
  82         # exhortation (either a #warning or an #error) to use sys/procfs.h
  83         # instead, plus an inclusion of that header.
  84         (sys/elf.h)
  85             continue;;
  86
  87         # sys/sysctl.h is unsupported for x32.
  88         (sys/sysctl.h)
  89             case "$is_x32" in
  90                 (yes) continue;;
  91                 (no)  ;;
  92                 (unknown)
  93                     cat >"$cih_test_c" <<EOF
  94 #if defined __x86_64__ && defined __ILP32__
  95 # error "is x32"
  96 #endif
  97 EOF
  98                     if $cc_cmd -fsyntax-only "$cih_test_c" > /dev/null 2>&1
  99                     then
 100                         is_x32=no
 101                     else
 102                         is_x32=yes
 103                         continue
 104                     fi
 105                 ;;
 106             esac
 107             ;;
 108
 109         # sys/vm86.h is "unsupported on x86-64" and errors out on that target.
 110         (sys/vm86.h)
 111             case "$is_x86_64" in
 112                 (yes) continue;;
 113                 (no)  ;;
 114                 (unknown)
 115                     cat >"$cih_test_c" <<EOF
 116 #if defined __x86_64__ && __x86_64__
 117 #error "is x86-64"
 118 #endif
 119 EOF
 120                     if $cc_cmd -fsyntax-only "$cih_test_c" > /dev/null 2>&1
 121                     then
 122                         is_x86_64=no
 123                     else
 124                         is_x86_64=yes
 125                         continue
 126                     fi
 127                 ;;
 128             esac
 129     esac
 130
 131     echo :: "$header"
 132     for lang_mode in "" $lang_modes; do
 133         for lib_mode in "" $lib_modes; do
 134             echo :::: $lang_mode $lib_mode
 135             if [ -z "$lib_mode" ]; then
 136                 expanded_lib_mode='/* default library mode */'
 137             else
 138                 expanded_lib_mode=$(echo : $lib_mode | \
 139                     sed 's/^: -D/#define /; s/=/ /')
 140             fi
 141             cat >"$cih_test_c" <<EOF
 142 /* These macros may have been defined on the command line.  They are
 143    inappropriate for this test.  */
 144 #undef _LIBC
 145 #undef _GNU_SOURCE
 146 /* The library mode is selected here rather than on the command line to
 147    ensure that this selection wins. */
 148 $expanded_lib_mode
 149 #include <$header>
 150 int avoid_empty_translation_unit;
 151 EOF
 152             if $cc_cmd -fsyntax-only $lang_mode "$cih_test_c" 2>&1
 153             then
 154                 includes=$($cc_cmd -fsyntax-only -H $lang_mode \
 155                               "$cih_test_c" 2>&1 | sed -ne 's/^[.][.]* //p')
 156                 for h in $includes; do
 157                     # Don't repeat work.
 158                     eval 'case "$h" in ('"$already"') continue;; esac'
 159
 160                     if grep -qE "$obsolete_type_re" "$h"; then
 161                         echo "*** Obsolete types detected:"
 162                         grep -HE "$obsolete_type_re" "$h"
 163                         failed=1
 164                     fi
 165                     already="$already|$h"
 166                 done
 167             else
 168                 failed=1
 169             fi
 170         done
 171     done
 172 done
 173 exit $failed