allow C code to suppress warnings about ignored return values
This commit is contained in:
Paul Eggert
parent
90b750f4e2
commit
67342916c9
8 changed files with 84 additions and 51 deletions
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@ -1,3 +1,9 @@
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2011-02-03 Paul Eggert <eggert@cs.ucla.edu>
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allow C code to suppress warnings about ignored return values
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* Makefile.in (GNULIB_MODULES): Add ignore-value.
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* configure, lib/Makefile.in, lib/gnulib.mk, m4/gl-comp.m4: Regenerate.
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2011-01-31 Chong Yidong <cyd@stupidchicken.com>
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* configure.in: Test existence of xaw3d library, not just the
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@ -330,7 +330,7 @@ DOS_gnulib_comp.m4 = gl-comp.m4
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# Update modules from gnulib, for maintainers, who should have it in
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# $(gnulib_srcdir) (relative to $(srcdir) and should have build tools
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# as per $(gnulib_srcdir)/DEPENDENCIES.
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GNULIB_MODULES = dtoastr getopt-gnu mktime strftime
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GNULIB_MODULES = dtoastr getopt-gnu ignore-value mktime strftime
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GNULIB_TOOL_FLAGS = \
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--import --no-changelog --no-vc-files --makefile-name=gnulib.mk
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sync-from-gnulib: $(gnulib_srcdir)
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91
configure
vendored
91
configure
vendored
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@ -5826,6 +5826,7 @@ $as_echo "$ac_cv_safe_to_define___extensions__" >&6; }
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# Code from module getopt-gnu:
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# Code from module getopt-posix:
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# Code from module gettext-h:
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# Code from module ignore-value:
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# Code from module include_next:
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# Code from module intprops:
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# Code from module mktime:
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@ -10597,7 +10598,7 @@ _ACEOF
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if ac_fn_c_try_link "$LINENO"; then :
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for XawScrollbarSetThumb in -lXaw3d" >&5
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$as_echo_n "checking for XawScrollbarSetThumb in -lXaw3d... " >&6; }
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if test "${ac_cv_lib_Xaw3d_XawScrollbarSetThumb+set}" = set; then :
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if ${ac_cv_lib_Xaw3d_XawScrollbarSetThumb+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ac_check_lib_save_LIBS=$LIBS
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@ -10631,7 +10632,7 @@ LIBS=$ac_check_lib_save_LIBS
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_Xaw3d_XawScrollbarSetThumb" >&5
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$as_echo "$ac_cv_lib_Xaw3d_XawScrollbarSetThumb" >&6; }
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if test "x$ac_cv_lib_Xaw3d_XawScrollbarSetThumb" = x""yes; then :
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if test "x$ac_cv_lib_Xaw3d_XawScrollbarSetThumb" = xyes; then :
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emacs_cv_xaw3d=yes
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else
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emacs_cv_xaw3d=no
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@ -14330,6 +14331,48 @@ $as_echo "#define __GETOPT_PREFIX rpl_" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inline" >&5
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$as_echo_n "checking for inline... " >&6; }
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if ${ac_cv_c_inline+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ac_cv_c_inline=no
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for ac_kw in inline __inline__ __inline; do
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#ifndef __cplusplus
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typedef int foo_t;
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static $ac_kw foo_t static_foo () {return 0; }
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$ac_kw foo_t foo () {return 0; }
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#endif
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ac_cv_c_inline=$ac_kw
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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test "$ac_cv_c_inline" != no && break
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done
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_inline" >&5
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$as_echo "$ac_cv_c_inline" >&6; }
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case $ac_cv_c_inline in
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inline | yes) ;;
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*)
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case $ac_cv_c_inline in
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no) ac_val=;;
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*) ac_val=$ac_cv_c_inline;;
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esac
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cat >>confdefs.h <<_ACEOF
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#ifndef __cplusplus
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#define inline $ac_val
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#endif
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_ACEOF
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;;
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esac
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GNULIB_MKTIME=0;
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GNULIB_NANOSLEEP=0;
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@ -14404,48 +14447,6 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inline" >&5
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$as_echo_n "checking for inline... " >&6; }
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if ${ac_cv_c_inline+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ac_cv_c_inline=no
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for ac_kw in inline __inline__ __inline; do
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#ifndef __cplusplus
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typedef int foo_t;
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static $ac_kw foo_t static_foo () {return 0; }
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$ac_kw foo_t foo () {return 0; }
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#endif
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ac_cv_c_inline=$ac_kw
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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test "$ac_cv_c_inline" != no && break
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done
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_inline" >&5
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$as_echo "$ac_cv_c_inline" >&6; }
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case $ac_cv_c_inline in
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inline | yes) ;;
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*)
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case $ac_cv_c_inline in
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no) ac_val=;;
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*) ac_val=$ac_cv_c_inline;;
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esac
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cat >>confdefs.h <<_ACEOF
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#ifndef __cplusplus
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#define inline $ac_val
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#endif
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_ACEOF
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;;
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esac
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for stdbool.h that conforms to C99" >&5
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$as_echo_n "checking for stdbool.h that conforms to C99... " >&6; }
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if ${ac_cv_header_stdbool_h+:} false; then :
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@ -14888,6 +14889,8 @@ fi
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# Code from module gettext-h:
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# Code from module ignore-value:
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# Code from module include_next:
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# Code from module intprops:
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# Code from module mktime:
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@ -24,7 +24,7 @@
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# the same distribution terms as the rest of that program.
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#
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# Generated by gnulib-tool.
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# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files dtoastr getopt-gnu mktime strftime
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# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files dtoastr getopt-gnu ignore-value mktime strftime
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VPATH = @srcdir@
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pkgdatadir = $(datadir)/@PACKAGE@
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@ -483,7 +483,7 @@ MOSTLYCLEANFILES = core *.stackdump arg-nonnull.h arg-nonnull.h-t \
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unistd.h-t warn-on-use.h warn-on-use.h-t
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noinst_LIBRARIES = libgnu.a
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DEFAULT_INCLUDES = -I. -I../src -I$(top_srcdir)/src
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libgnu_a_SOURCES = dtoastr.c gettext.h
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libgnu_a_SOURCES = dtoastr.c gettext.h ignore-value.h
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libgnu_a_LIBADD = $(gl_LIBOBJS)
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libgnu_a_DEPENDENCIES = $(gl_LIBOBJS)
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EXTRA_libgnu_a_SOURCES = ftoastr.c getopt.c getopt1.c mktime.c \
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@ -9,7 +9,7 @@
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# the same distribution terms as the rest of that program.
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#
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# Generated by gnulib-tool.
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# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files dtoastr getopt-gnu mktime strftime
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# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files dtoastr getopt-gnu ignore-value mktime strftime
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MOSTLYCLEANFILES += core *.stackdump
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@ -111,6 +111,12 @@ libgnu_a_SOURCES += gettext.h
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## end gnulib module gettext-h
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## begin gnulib module ignore-value
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libgnu_a_SOURCES += ignore-value.h
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## end gnulib module ignore-value
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## begin gnulib module intprops
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@ -34,6 +34,7 @@ AC_DEFUN([gl_EARLY],
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# Code from module getopt-gnu:
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# Code from module getopt-posix:
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# Code from module gettext-h:
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# Code from module ignore-value:
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# Code from module include_next:
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# Code from module intprops:
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# Code from module mktime:
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@ -76,6 +77,8 @@ AC_DEFUN([gl_INIT],
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# Code from module gettext-h:
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AC_SUBST([LIBINTL])
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AC_SUBST([LTLIBINTL])
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# Code from module ignore-value:
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AC_REQUIRE([AC_C_INLINE])
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# Code from module include_next:
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# Code from module intprops:
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# Code from module mktime:
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@ -248,6 +251,7 @@ AC_DEFUN([gl_FILE_LIST], [
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lib/getopt1.c
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lib/getopt_int.h
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lib/gettext.h
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lib/ignore-value.h
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lib/intprops.h
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lib/mktime-internal.h
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lib/mktime.c
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@ -1,3 +1,16 @@
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2011-02-03 Paul Eggert <eggert@cs.ucla.edu>
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allow C code to suppress warnings about ignored return values
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We need to go through the code and for each such warning, either
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fix the code to pay attention to the returned value, or tell GCC
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that we really do want to ignore the returned value. Here is one
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example of how to do the latter.
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* sysdep.c: Include <ignore-value.h>.
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(sys_subshell): Suppress an undesirable warning about not checking
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the returned value of 'write', as there's nothing useful one can
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do with that returned value.
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2011-02-03 Jan Djärv <jan.h.d@swipnet.se>
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* xterm.c (x_connection_closed): Remove all calls that calls
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@ -31,6 +31,8 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
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#endif /* HAVE_LIMITS_H */
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#include <unistd.h>
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#include <ignore-value.h>
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#include "lisp.h"
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#include "sysselect.h"
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#include "blockinput.h"
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@ -263,7 +265,7 @@ void
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init_baud_rate (int fd)
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{
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int emacs_ospeed;
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if (noninteractive)
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emacs_ospeed = 0;
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else
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@ -578,7 +580,7 @@ sys_subshell (void)
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write (1, "Can't execute subshell", 22);
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#else /* not WINDOWSNT */
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execlp (sh, sh, (char *) 0);
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write (1, "Can't execute subshell", 22);
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ignore_value (write (1, "Can't execute subshell", 22));
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_exit (1);
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#endif /* not WINDOWSNT */
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#endif /* not MSDOS */
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@ -3058,4 +3060,3 @@ system_process_attributes (Lisp_Object pid)
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}
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#endif /* !defined (WINDOWSNT) */
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