scripts/check-installed-headers.sh

   1 #! /bin/sh
   2 # Copyright (C) 2016-2021 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 # <https://www.gnu.org/licenses/>.
  18
  19 # For each installed header, confirm that it's possible to compile a
  20 # file that includes that header and does nothing else, in several
  21 # different compilation modes.
  22
  23 # These compilation switches assume GCC or compatible, which is probably
  24 # fine since we also assume that when _building_ glibc.
  25 c_modes="-std=c89 -std=gnu89 -std=c11 -std=gnu11"
  26 cxx_modes="-std=c++98 -std=gnu++98 -std=c++11 -std=gnu++11"
  27
  28 # An exhaustive test of feature selection macros would take far too long.
  29 # These are probably the most commonly used three.
  30 lib_modes="-D_DEFAULT_SOURCE=1 -D_GNU_SOURCE=1 -D_XOPEN_SOURCE=700"
  31
  32 if [ $# -lt 3 ]; then
  33     echo "usage: $0 c|c++ \"compile command\" header header header..." >&2
  34     exit 2
  35 fi
  36 case "$1" in
  37     (c)
  38         lang_modes="$c_modes"
  39         cih_test_c=$(mktemp ${TMPDIR-/tmp}/cih_test_XXXXXX.c)
  40     ;;
  41     (c++)
  42         lang_modes="$cxx_modes"
  43         cih_test_c=$(mktemp ${TMPDIR-/tmp}/cih_test_XXXXXX.cc)
  44     ;;
  45     (*)
  46         echo "usage: $0 c|c++ \"compile command\" header header header..." >&2
  47         exit 2;;
  48 esac
  49 shift
  50 cc_cmd="$1"
  51 shift
  52 trap "rm -f '$cih_test_c'" 0
  53
  54 failed=0
  55 is_x86_64=unknown
  56 for header in "$@"; do
  57     # Skip various headers for which this test gets a false failure.
  58     case "$header" in
  59         # bits/* are not meant to be included directly and usually #error
  60         # out if you try it.
  61         # regexp.h is a stub containing only an #error.
  62         # Sun RPC's .x files are traditionally installed in
  63         # $prefix/include/rpcsvc, but they are not C header files.
  64         (bits/* | regexp.h | rpcsvc/*.x)
  65             continue;;
  66
  67         # All extant versions of sys/elf.h contain nothing more than an
  68         # exhortation (either a #warning or an #error) to use sys/procfs.h
  69         # instead, plus an inclusion of that header.
  70         (sys/elf.h)
  71             continue;;
  72
  73         # Skip Fortran headers.
  74         (finclude/*)
  75             continue;;
  76
  77         # sys/vm86.h is "unsupported on x86-64" and errors out on that target.
  78         (sys/vm86.h)
  79             case "$is_x86_64" in
  80                 (yes) continue;;
  81                 (no)  ;;
  82                 (unknown)
  83                     cat >"$cih_test_c" <<EOF
  84 #if defined __x86_64__ && __x86_64__
  85 #error "is x86-64"
  86 #endif
  87 EOF
  88                     if $cc_cmd -fsyntax-only "$cih_test_c" > /dev/null 2>&1
  89                     then
  90                         is_x86_64=no
  91                     else
  92                         is_x86_64=yes
  93                         continue
  94                     fi
  95                 ;;
  96             esac
  97             ;;
  98     esac
  99
 100     echo :: "$header"
 101     for lang_mode in "" $lang_modes; do
 102         for lib_mode in "" $lib_modes; do
 103             echo :::: $lang_mode $lib_mode
 104             if [ -z "$lib_mode" ]; then
 105                 expanded_lib_mode='/* default library mode */'
 106             else
 107                 expanded_lib_mode=$(echo : $lib_mode | \
 108                     sed 's/^: -D/#define /; s/=/ /')
 109             fi
 110             cat >"$cih_test_c" <<EOF
 111 /* These macros may have been defined on the command line.  They are
 112    inappropriate for this test.  */
 113 #undef _LIBC
 114 #undef _GNU_SOURCE
 115 /* The library mode is selected here rather than on the command line to
 116    ensure that this selection wins. */
 117 $expanded_lib_mode
 118 #include <$header>
 119 int avoid_empty_translation_unit;
 120 EOF
 121             if $cc_cmd -finput-charset=ascii -fsyntax-only $lang_mode \
 122                        "$cih_test_c" 2>&1
 123             then :
 124             else failed=1
 125             fi
 126         done
 127     done
 128 done
 129 exit $failed