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Adjust GCC warnings:

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Better disable following warnings when cross-compiling with a gcc older
  than 3.0, to avoid warnings from third party system headers:

    -Wmissing-declarations
    -Wmissing-prototypes
    -Wunused
    -Wshadow
pull/1/head
Yang Tse 17 years ago
parent 7e94946102
commit 7444d55a7f
1 changed files with 61 additions and 31 deletions
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  1. 92
      m4/cares-compilers.m4

92
m4/cares-compilers.m4
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@ -16,7 +16,7 @@
#***************************************************************************
# File version for 'aclocal' use. Keep it a single number.
# serial 29
# serial 32
dnl CARES_CHECK_COMPILER
@ -787,65 +787,95 @@ AC_DEFUN([CARES_SET_COMPILER_WARNING_OPTS], [
GNU_C)
#
if test "$want_warnings" = "yes"; then
#
dnl Do not enable -pedantic when cross-compiling with a gcc older
dnl than 3.0, to avoid warnings from third party system headers.
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
tmp_CFLAGS="$tmp_CFLAGS -pedantic"
fi
#
dnl Set of options we believe *ALL* gcc versions support:
tmp_CFLAGS="$tmp_CFLAGS -Wall -W -Winline -Wnested-externs"
tmp_CFLAGS="$tmp_CFLAGS -Wpointer-arith -Wwrite-strings"
dnl -Wcast-align is a bit too annoying on all gcc versions ;-)
dnl Do not enable some warnings, when cross-compiling with a gcc
dnl older than 3.0, triggered on third party system headers.
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-prototypes"
tmp_CFLAGS="$tmp_CFLAGS -Wall -W"
#
dnl Only gcc 1.4 or later
if test "$compiler_num" -ge "104"; then
tmp_CFLAGS="$tmp_CFLAGS -Wpointer-arith -Wwrite-strings"
dnl If not cross-compiling with a gcc older than 3.0
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
tmp_CFLAGS="$tmp_CFLAGS -Wunused -Wshadow"
fi
fi
#
dnl Only gcc 2.7 or later
if test "$compiler_num" -ge "207"; then
dnl gcc 2.7 or later
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-declarations"
tmp_CFLAGS="$tmp_CFLAGS -Winline -Wnested-externs"
dnl If not cross-compiling with a gcc older than 3.0
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-declarations"
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-prototypes"
fi
fi
if test "$compiler_num" -gt "295"; then
dnl only if the compiler is newer than 2.95 since we got lots of
dnl "`_POSIX_C_SOURCE' is not defined" in system headers with
dnl gcc 2.95.4 on FreeBSD 4.9!
tmp_CFLAGS="$tmp_CFLAGS -Wno-long-long -Wno-multichar -Wshadow"
tmp_CFLAGS="$tmp_CFLAGS -Wsign-compare -Wundef"
#
dnl Only gcc 2.95 or later
if test "$compiler_num" -ge "295"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-long-long"
fi
#
dnl Only gcc 2.96 or later
if test "$compiler_num" -ge "296"; then
dnl gcc 2.96 or later
tmp_CFLAGS="$tmp_CFLAGS -Wfloat-equal"
tmp_CFLAGS="$tmp_CFLAGS -Wno-multichar -Wsign-compare"
dnl -Wundef used only if gcc is 2.96 or later since we get
dnl lots of "`_POSIX_C_SOURCE' is not defined" in system
dnl headers with gcc 2.95.4 on FreeBSD 4.9
tmp_CFLAGS="$tmp_CFLAGS -Wundef"
fi
if test "$compiler_num" -gt "296"; then
dnl this option does not exist in 2.96
#
dnl Only gcc 2.97 or later
if test "$compiler_num" -ge "297"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-format-nonliteral"
fi
dnl -Wunreachable-code seems totally unreliable on my gcc 3.3.2 on
dnl on i686-Linux as it gives us heaps with false positives.
dnl Also, on gcc 4.0.X it is totally unbearable and complains all
dnl over making it unusable for generic purposes. Let's not use it.
#
dnl Only gcc 3.0 or later
if test "$compiler_num" -ge "300"; then
dnl -Wunreachable-code seems totally unreliable on my gcc 3.3.2 on
dnl on i686-Linux as it gives us heaps with false positives.
dnl Also, on gcc 4.0.X it is totally unbearable and complains all
dnl over making it unusable for generic purposes. Let's not use it.
tmp_CFLAGS="$tmp_CFLAGS"
fi
#
dnl Only gcc 3.3 or later
if test "$compiler_num" -ge "303"; then
dnl gcc 3.3 and later
tmp_CFLAGS="$tmp_CFLAGS -Wendif-labels -Wstrict-prototypes"
fi
#
dnl Only gcc 3.4 or later
if test "$compiler_num" -ge "304"; then
dnl gcc 3.4 and later
tmp_CFLAGS="$tmp_CFLAGS -Wdeclaration-after-statement"
fi
#
fi
#
dnl Do not issue warnings for code in system include paths.
if test "$compiler_num" -ge "300"; then
dnl gcc 3.0 and later
tmp_CFLAGS="$tmp_CFLAGS -Wno-system-headers"
else
dnl Disable some warnings, when cross-compiling with a gcc
dnl older than 3.0, triggered on third party system headers.
dnl When cross-compiling with a gcc older than 3.0, disable
dnl some warnings triggered on third party system headers.
if test "x$cross_compiling" = "xyes"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-missing-prototypes"
tmp_CFLAGS="$tmp_CFLAGS -Wno-unused -Wno-shadow"
if test "$compiler_num" -ge "104"; then
dnl gcc 1.4 or later
tmp_CFLAGS="$tmp_CFLAGS -Wno-unused -Wno-shadow"
fi
if test "$compiler_num" -ge "207"; then
dnl gcc 2.7 or later
tmp_CFLAGS="$tmp_CFLAGS -Wno-missing-declarations"
tmp_CFLAGS="$tmp_CFLAGS -Wno-missing-prototypes"
fi
fi
fi
;;

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