AC_ARG_ENABLE([gcc-warnings],
[AS_HELP_STRING([--enable-gcc-warnings],
- [turn on lots of GCC warnings (for developers)])],
+ [turn on lots of GCC warnings. This is intended for
+ developers, and may generate false alarms when used
+ with older or non-GNU development tools.])],
[case $enableval in
yes|no) ;;
*) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
LTO="-flto=$CPUS"
else
LTO="-flto"
- fi
+ fi
old_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS $LTO"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
nw="$nw -Wsign-conversion" # Too many warnings for now
nw="$nw -Woverlength-strings" # Not a problem these days
nw="$nw -Wtraditional-conversion" # Too many warnings for now
+ nw="$nw -Wunreachable-code" # so buggy that it's now silently ignored
nw="$nw -Wpadded" # Our structs are not padded
- nw="$nw -Wredundant-decls" # We regularly (re)declare getenv etc.
+ nw="$nw -Wredundant-decls" # we regularly (re)declare functions
nw="$nw -Wlogical-op" # any use of fwrite provokes this
- nw="$nw -Wformat-nonliteral" # Emacs does this a lot
+ nw="$nw -Wformat-nonliteral" # we do this a lot
nw="$nw -Wvla" # warnings in gettext.h
nw="$nw -Wnested-externs" # use of XARGMATCH/verify_function__
nw="$nw -Wswitch-enum" # Too many warnings for now
nw="$nw -Wswitch-default" # Too many warnings for now
- nw="$nw -Wfloat-equal" # e.g., ftoastr.c
- nw="$nw -Winline" # e.g., dispnew.c's inlining of row_equal_p
+ nw="$nw -Wfloat-equal" # warns about high-quality code
+ nw="$nw -Winline" # OK to ignore 'inline'
+ nw="$nw -Wsync-nand" # irrelevant here, and provokes ObjC warning
+ nw="$nw -Wunsafe-loop-optimizations" # OK to suppress unsafe optimizations
# Emacs doesn't care about shadowing; see
# <http://lists.gnu.org/archive/html/emacs-diffs/2011-11/msg00265.html>.
if test "${with_png}" != "no"; then
# Debian unstable as of July 2003 has multiple libpngs, and puts png.h
# in /usr/include/libpng.
- AC_CHECK_HEADERS(png.h libpng/png.h)
+ AC_CHECK_HEADERS(png.h libpng/png.h, break)
if test "$ac_cv_header_png_h" = yes || test "$ac_cv_header_libpng_png_h" = yes ; then
AC_CHECK_LIB(png, png_get_channels, HAVE_PNG=yes, , -lz -lm)
fi
if test "${HAVE_PNG}" = "yes"; then
AC_DEFINE(HAVE_PNG, 1, [Define to 1 if you have the png library (-lpng).])
LIBPNG="-lpng -lz -lm"
+
+ AC_CHECK_DECL(png_longjmp,
+ [],
+ [AC_DEFINE(PNG_DEPRECATED, [],
+ [Define to empty to suppress deprecation warnings when building
+ with --enable-gcc-warnings and with libpng versions before 1.5,
+ which lack png_longjmp.])],
+ [[#ifdef HAVE_LIBPNG_PNG_H
+ # include <libpng/png.h>
+ #else
+ # include <png.h>
+ #endif
+ ]])
fi
fi
AC_SUBST(LIBPNG)
AC_CHECK_FUNCS(gethostname \
rename closedir mkdir rmdir getrusage get_current_dir_name \
-random lrand48 logb frexp fmod rint cbrt setsid \
+lrand48 logb frexp fmod cbrt setsid \
strerror fpathconf select euidaccess getpagesize setlocale \
-utimes getrlimit setrlimit setpgid getcwd getwd shutdown getaddrinfo \
+utimes getrlimit setrlimit setpgid getcwd shutdown getaddrinfo \
__fpending strsignal setitimer \
sendto recvfrom getsockname getpeername getifaddrs freeifaddrs \
gai_strerror mkstemp getline getdelim fsync sync \
difftime posix_memalign \
getpwent endpwent getgrent endgrent \
touchlock \
-strcasecmp strncasecmp \
cfmakeraw cfsetspeed copysign __executable_start)
+dnl getwd appears to be buggy on SVR4.2, so we don't use it.
+if test $opsys != unixware; then
+ AC_CHECK_FUNCS(getwd)
+fi
+
+## Eric Backus <ericb@lsid.hp.com> says, HP-UX 9.x on HP 700 machines
+## has a broken `rint' in some library versions including math library
+## version number A.09.05.
+## You can fix the math library by installing patch number PHSS_4630.
+## But we can fix it more reliably for Emacs by just not using rint.
+## We also skip HAVE_RANDOM - see comments in src/s/hpux10-20.h.
+case $opsys in
+ hpux*) : ;;
+ *) AC_CHECK_FUNCS(random rint) ;;
+esac
+
dnl Cannot use AC_CHECK_FUNCS
AC_CACHE_CHECK([for __builtin_unwind_init],
emacs_cv_func___builtin_unwind_init,
# Do we have res_init, for detecting changes in /etc/resolv.conf?
+# On Darwin, res_init appears not to be useful: see bug#562 and
+# http://lists.gnu.org/archive/html/emacs-devel/2007-11/msg01467.html
resolv=no
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <netinet/in.h>
+
+if test $opsys != darwin; then
+
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>]],
[[return res_init();]])],
have_res_init=yes, have_res_init=no)
-if test "$have_res_init" = no; then
- OLIBS="$LIBS"
- LIBS="$LIBS -lresolv"
- AC_MSG_CHECKING(for res_init with -lresolv)
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <netinet/in.h>
+ if test "$have_res_init" = no; then
+ OLIBS="$LIBS"
+ LIBS="$LIBS -lresolv"
+ AC_MSG_CHECKING(for res_init with -lresolv)
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>]],
- [[return res_init();]])],
- have_res_init=yes, have_res_init=no)
- AC_MSG_RESULT($have_res_init)
- if test "$have_res_init" = yes ; then
- resolv=yes
+ [[return res_init();]])],
+ have_res_init=yes, have_res_init=no)
+ AC_MSG_RESULT($have_res_init)
+ if test "$have_res_init" = yes ; then
+ resolv=yes
+ fi
+ LIBS="$OLIBS"
fi
- LIBS="$OLIBS"
-fi
-if test "$have_res_init" = yes; then
- AC_DEFINE(HAVE_RES_INIT, 1, [Define to 1 if res_init is available.])
-fi
+ if test "$have_res_init" = yes; then
+ AC_DEFINE(HAVE_RES_INIT, 1, [Define to 1 if res_init is available.])
+ fi
+fi dnl !darwin
# Do we need the Hesiod library to provide the support routines?
+dnl FIXME? Should we be skipping this on Darwin too?
LIBHESIOD=
if test "$with_hesiod" != no ; then
# Don't set $LIBS here -- see comments above. FIXME which comments?
AC_SUBST(LIBHESIOD)
# Do we need libresolv (due to res_init or Hesiod)?
-if test "$resolv" = yes ; then
+if test "$resolv" = yes && test $opsys != darwin; then
AC_DEFINE(HAVE_LIBRESOLV, 1,
[Define to 1 if you have the resolv library (-lresolv).])
LIBRESOLV=-lresolv
gnu-kfreebsd) opsysfile="s/gnu-linux.h" ;;
hpux11)
- dnl SA_RESTART resets the timeout of `select', so don't use it.
- AC_DEFINE(BROKEN_SA_RESTART, 1, [Define if SA_RESTART should not
- be used.])
+ dnl See comments in sysdep.c:sys_signal.
+ dnl SA_RESTART resets the timeout of `select' on hpux11.
+ dnl Defining BROKEN_SA_RESTART is not the same as undef'ing SA_RESTART.
+ AC_DEFINE(BROKEN_SA_RESTART, 1, [Define if SA_RESTART should only
+ be used in batch mode.])
dnl It works to open the pty's tty in the parent (Emacs), then
dnl close and reopen it in the child.
AC_DEFINE(USG_SUBTTY_WORKS, 1, [Define for USG systems where it
HCoop / bpt / emacs.git / blobdiff