C++: handle glibc's ptrace(enum __ptrace_request, ...)
Building in C++ mode issues ~40 warnings like this: ../../src/gdb/linux-nat.c: In function ‘int linux_handle_extended_wait(lwp_info*, int, int)’: ../../src/gdb/linux-nat.c:2016:51: warning: invalid conversion from ‘int’ to ‘__ptrace_request’ [-fpermissive] ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); The issue is that in glibc, ptrace's first parameter is an enum. That's not a problem if we pick the PTRACE_XXX requests from sys/ptrace.h, as those will be values of the corresponding enum. However, we have fallback definitions for PTRACE_XXX symbols when the system headers miss them (such as PTRACE_GETEVENTMSG above), and those are plain integer constants. E.g., nat/linux-ptrace.h: #define PTRACE_GETEVENTMSG 0x4201 One idea would be to fix this by defining those fallbacks like: -#define PTRACE_GETEVENTMSG 0x4201 +#define PTRACE_GETEVENTMSG ((enum __ptrace_request) 0x4201) However, while glibc's ptrace uses enum __ptrace_request for first parameter: extern long int ptrace (enum __ptrace_request __request, ...) __THROW; other libc's, like e.g., Android's bionic do not -- in that case, the first parameter is int: long ptrace(int request, pid_t pid, void * addr, void * data); So the fix I came up is to make configure/ptrace.m4 also detect the type of the ptrace's first parameter and defin PTRACE_TYPE_ARG1, as already does the for parameters 3-4, and then simply wrap ptrace with a macro that casts the first argument to the detected type. (I'm leaving adding a nicer wrapper for when we drop building in C). While this adds the wrapper, GNU/Linux files won't use it until the next patch, which makes all native GNU/Linux files include gdb_ptrace.h. gdb/ChangeLog: 2015-07-24 Pedro Alves <palves@redhat.com> * ptrace.m4 (ptrace tests): Test in C++ mode. Try with 'enum __ptrace_request as first parameter type instead of int. (PTRACE_TYPE_ARG1): Define. * nat/gdb_ptrace.h [!PTRACE_TYPE_ARG5] (ptrace): Define as wrapper that casts first argument to PTRACE_TYPE_ARG1. * config.in: Regenerate. * configure: Regenerate. gdb/gdbserver/ChangeLog: 2015-07-24 Pedro Alves <palves@redhat.com> * config.in: Regenerate. * configure: Regenerate.
This commit is contained in:
Pedro Alves
parent
e379037592
commit
5401971915
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@ -1,3 +1,13 @@
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2015-07-24 Pedro Alves <palves@redhat.com>
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* ptrace.m4 (ptrace tests): Test in C++ mode. Try with 'enum
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__ptrace_request as first parameter type instead of int.
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(PTRACE_TYPE_ARG1): Define.
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* nat/gdb_ptrace.h [!PTRACE_TYPE_ARG5] (ptrace): Define as wrapper
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that casts first argument to PTRACE_TYPE_ARG1.
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* config.in: Regenerate.
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* configure: Regenerate.
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2015-07-24 Pedro Alves <palves@redhat.com>
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* gdb_ptrace.h: Move ...
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@ -653,6 +653,9 @@
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assorted other type changes. */
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#undef PROC_SERVICE_IS_OLD
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/* Define to the type of arg 1 for ptrace. */
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#undef PTRACE_TYPE_ARG1
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/* Define to the type of arg 3 for ptrace. */
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#undef PTRACE_TYPE_ARG3
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@ -2398,6 +2398,51 @@ $as_echo "$ac_res" >&6; }
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eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
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} # ac_fn_c_check_member
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# ac_fn_cxx_check_decl LINENO SYMBOL VAR
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# --------------------------------------
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# Tests whether SYMBOL is declared, setting cache variable VAR accordingly.
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ac_fn_cxx_check_decl ()
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{
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as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
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as_decl_name=`echo $2|sed 's/ *(.*//'`
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as_decl_use=`echo $2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $as_decl_name is declared" >&5
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$as_echo_n "checking whether $as_decl_name is declared... " >&6; }
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if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
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$as_echo_n "(cached) " >&6
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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$4
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int
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main ()
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{
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#ifndef $as_decl_name
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#ifdef __cplusplus
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(void) $as_decl_use;
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#else
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(void) $as_decl_name;
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#endif
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#endif
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;
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return 0;
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}
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_ACEOF
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if ac_fn_cxx_try_compile "$LINENO"; then :
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eval "$3=yes"
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else
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eval "$3=no"
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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eval ac_res=\$$3
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
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$as_echo "$ac_res" >&6; }
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eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
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} # ac_fn_cxx_check_decl
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cat >config.log <<_ACEOF
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This file contains any messages produced by compilers while
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running configure, to aid debugging if configure makes a mistake.
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@ -11926,8 +11971,36 @@ $as_echo "#define HAVE_SIGSETJMP 1" >>confdefs.h
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fi
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# Check the return and argument types of ptrace. No canned test for
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# this, so roll our own.
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# Check the return and argument types of ptrace.
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for ac_header in sys/ptrace.h ptrace.h
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do :
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as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
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ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
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eval as_val=\$$as_ac_Header
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if test "x$as_val" = x""yes; then :
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cat >>confdefs.h <<_ACEOF
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#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
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_ACEOF
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fi
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done
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# Needs to be tested in C++ mode, to detect whether we need to cast
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# the first argument to enum __ptrace_request.
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if test "$enable_build_with_cxx" = "yes"; then
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ac_ext=cpp
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ac_cpp='$CXXCPP $CPPFLAGS'
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ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
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fi
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gdb_ptrace_headers='
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#include <sys/types.h>
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#if HAVE_SYS_PTRACE_H
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@ -11938,7 +12011,7 @@ gdb_ptrace_headers='
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#endif
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'
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# There is no point in checking if we don't have a prototype.
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ac_fn_c_check_decl "$LINENO" "ptrace" "ac_cv_have_decl_ptrace" "$gdb_ptrace_headers
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ac_fn_cxx_check_decl "$LINENO" "ptrace" "ac_cv_have_decl_ptrace" "$gdb_ptrace_headers
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"
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if test "x$ac_cv_have_decl_ptrace" = x""yes; then :
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ac_have_decl=1
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@ -11976,7 +12049,7 @@ extern long ptrace (enum __ptrace_request, ...);
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_ret='long'
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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@ -11990,7 +12063,7 @@ extern int ptrace ();
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_ret='int'
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else
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gdb_cv_func_ptrace_ret='long'
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@ -12024,8 +12097,8 @@ extern long ptrace (enum __ptrace_request, ...);
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_args='int,int,long,long'
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_args='enum __ptrace_request,int,long,long'
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else
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for gdb_arg1 in 'int' 'long'; do
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@ -12046,7 +12119,7 @@ extern $gdb_cv_func_ptrace_ret
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4";
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break 4;
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fi
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@ -12066,7 +12139,7 @@ extern $gdb_cv_func_ptrace_ret
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4,$gdb_arg5";
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break 5;
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@ -12090,6 +12163,11 @@ set dummy `echo "$gdb_cv_func_ptrace_args" | sed 's/\*/\*/g'`
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IFS=$ac_save_IFS
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shift
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cat >>confdefs.h <<_ACEOF
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#define PTRACE_TYPE_ARG1 $1
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_ACEOF
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cat >>confdefs.h <<_ACEOF
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#define PTRACE_TYPE_ARG3 $3
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_ACEOF
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@ -12107,6 +12185,16 @@ _ACEOF
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fi
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if test "$enable_build_with_cxx" = "yes"; then
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ac_ext=c
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ac_cpp='$CPP $CPPFLAGS'
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ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_c_compiler_gnu
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fi
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if test "$cross_compiling" = no; then
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether setpgrp takes no argument" >&5
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$as_echo_n "checking whether setpgrp takes no argument... " >&6; }
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@ -13925,8 +14013,7 @@ $as_echo_n "checking compiler warning flags... " >&6; }
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CFLAGS="$CFLAGS $w"
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saved_CXXFLAGS="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS $w"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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@ -1,3 +1,8 @@
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2015-07-24 Pedro Alves <palves@redhat.com>
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* config.in: Regenerate.
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* configure: Regenerate.
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2015-07-24 Pedro Alves <palves@redhat.com>
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* acinclude.m4: Include ../ptrace.m4.
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@ -310,6 +310,9 @@
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/* Additional package description */
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#undef PKGVERSION
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/* Define to the type of arg 1 for ptrace. */
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#undef PTRACE_TYPE_ARG1
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/* Define to the type of arg 3 for ptrace. */
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#undef PTRACE_TYPE_ARG3
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@ -1878,6 +1878,51 @@ $as_echo "$ac_res" >&6; }
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} # ac_fn_c_check_decl
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# ac_fn_cxx_check_decl LINENO SYMBOL VAR
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# --------------------------------------
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# Tests whether SYMBOL is declared, setting cache variable VAR accordingly.
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ac_fn_cxx_check_decl ()
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{
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as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
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as_decl_name=`echo $2|sed 's/ *(.*//'`
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as_decl_use=`echo $2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $as_decl_name is declared" >&5
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$as_echo_n "checking whether $as_decl_name is declared... " >&6; }
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if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
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$as_echo_n "(cached) " >&6
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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$4
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int
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main ()
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{
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#ifndef $as_decl_name
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#ifdef __cplusplus
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(void) $as_decl_use;
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#else
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(void) $as_decl_name;
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#endif
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#endif
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;
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return 0;
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}
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_ACEOF
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if ac_fn_cxx_try_compile "$LINENO"; then :
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eval "$3=yes"
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else
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eval "$3=no"
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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eval ac_res=\$$3
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
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$as_echo "$ac_res" >&6; }
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eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
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} # ac_fn_cxx_check_decl
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# ac_fn_c_check_type LINENO TYPE VAR INCLUDES
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# -------------------------------------------
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# Tests whether TYPE exists after having included INCLUDES, setting cache
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@ -5751,6 +5796,7 @@ fi
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# Check the return and argument types of ptrace.
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for ac_header in sys/ptrace.h ptrace.h
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do :
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as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
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@ -5766,6 +5812,17 @@ fi
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done
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# Needs to be tested in C++ mode, to detect whether we need to cast
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# the first argument to enum __ptrace_request.
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if test "$enable_build_with_cxx" = "yes"; then
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ac_ext=cpp
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ac_cpp='$CXXCPP $CPPFLAGS'
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ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
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fi
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gdb_ptrace_headers='
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#include <sys/types.h>
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#if HAVE_SYS_PTRACE_H
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@ -5776,7 +5833,7 @@ gdb_ptrace_headers='
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#endif
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'
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# There is no point in checking if we don't have a prototype.
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ac_fn_c_check_decl "$LINENO" "ptrace" "ac_cv_have_decl_ptrace" "$gdb_ptrace_headers
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ac_fn_cxx_check_decl "$LINENO" "ptrace" "ac_cv_have_decl_ptrace" "$gdb_ptrace_headers
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"
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if test "x$ac_cv_have_decl_ptrace" = x""yes; then :
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ac_have_decl=1
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@ -5814,7 +5871,7 @@ extern long ptrace (enum __ptrace_request, ...);
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_ret='long'
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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@ -5828,7 +5885,7 @@ extern int ptrace ();
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_ret='int'
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else
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gdb_cv_func_ptrace_ret='long'
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@ -5862,8 +5919,8 @@ extern long ptrace (enum __ptrace_request, ...);
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_args='int,int,long,long'
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_args='enum __ptrace_request,int,long,long'
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else
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for gdb_arg1 in 'int' 'long'; do
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@ -5884,7 +5941,7 @@ extern $gdb_cv_func_ptrace_ret
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4";
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break 4;
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fi
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@ -5904,7 +5961,7 @@ extern $gdb_cv_func_ptrace_ret
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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if ac_fn_cxx_try_compile "$LINENO"; then :
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gdb_cv_func_ptrace_args="$gdb_arg1,$gdb_arg2,$gdb_arg3,$gdb_arg4,$gdb_arg5";
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break 5;
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@ -5928,6 +5985,11 @@ set dummy `echo "$gdb_cv_func_ptrace_args" | sed 's/\*/\*/g'`
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IFS=$ac_save_IFS
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shift
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cat >>confdefs.h <<_ACEOF
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#define PTRACE_TYPE_ARG1 $1
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_ACEOF
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cat >>confdefs.h <<_ACEOF
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#define PTRACE_TYPE_ARG3 $3
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_ACEOF
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@ -5945,6 +6007,15 @@ _ACEOF
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fi
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||||
|
||||
if test "$enable_build_with_cxx" = "yes"; then
|
||||
ac_ext=c
|
||||
ac_cpp='$CPP $CPPFLAGS'
|
||||
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
|
||||
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
|
||||
ac_compiler_gnu=$ac_cv_c_compiler_gnu
|
||||
|
||||
fi
|
||||
|
||||
|
||||
# Check for UST
|
||||
ustlibs=""
|
||||
|
|
@ -6087,8 +6158,7 @@ $as_echo_n "checking compiler warning flags... " >&6; }
|
|||
CFLAGS="$CFLAGS $w"
|
||||
saved_CXXFLAGS="$CXXFLAGS"
|
||||
CXXFLAGS="$CXXFLAGS $w"
|
||||
|
||||
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
|
||||
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
|
||||
/* end confdefs.h. */
|
||||
|
||||
int
|
||||
|
|
|
|||
|
|
@ -144,6 +144,10 @@ extern PTRACE_TYPE_RET ptrace();
|
|||
# define ptrace(request, pid, addr, data) \
|
||||
ptrace (request, pid, addr, data, 0)
|
||||
# endif
|
||||
#else
|
||||
/* Wrapper that avoids adding a pointless cast to all callers. */
|
||||
# define ptrace(request, pid, addr, data) \
|
||||
ptrace ((PTRACE_TYPE_ARG1) request, pid, addr, data)
|
||||
#endif
|
||||
|
||||
#endif /* gdb_ptrace.h */
|
||||
|
|
|
|||
|
|
@ -22,6 +22,12 @@ AC_DEFUN([GDB_AC_PTRACE],
|
|||
|
||||
AC_CHECK_HEADERS([sys/ptrace.h ptrace.h])
|
||||
|
||||
# Needs to be tested in C++ mode, to detect whether we need to cast
|
||||
# the first argument to enum __ptrace_request.
|
||||
if test "$enable_build_with_cxx" = "yes"; then
|
||||
AC_LANG_PUSH([C++])
|
||||
fi
|
||||
|
||||
gdb_ptrace_headers='
|
||||
#include <sys/types.h>
|
||||
#if HAVE_SYS_PTRACE_H
|
||||
|
|
@ -52,7 +58,7 @@ AC_DEFINE_UNQUOTED(PTRACE_TYPE_RET, $gdb_cv_func_ptrace_ret,
|
|||
AC_CACHE_CHECK([types of arguments for ptrace], gdb_cv_func_ptrace_args, [
|
||||
AC_TRY_COMPILE($gdb_ptrace_headers,
|
||||
[extern long ptrace (enum __ptrace_request, ...);],
|
||||
[gdb_cv_func_ptrace_args='int,int,long,long'],[
|
||||
[gdb_cv_func_ptrace_args='enum __ptrace_request,int,long,long'],[
|
||||
for gdb_arg1 in 'int' 'long'; do
|
||||
for gdb_arg2 in 'pid_t' 'int' 'long'; do
|
||||
for gdb_arg3 in 'int *' 'caddr_t' 'int' 'long' 'void *'; do
|
||||
|
|
@ -81,6 +87,8 @@ ac_save_IFS=$IFS; IFS=','
|
|||
set dummy `echo "$gdb_cv_func_ptrace_args" | sed 's/\*/\*/g'`
|
||||
IFS=$ac_save_IFS
|
||||
shift
|
||||
AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG1, $[1],
|
||||
[Define to the type of arg 1 for ptrace.])
|
||||
AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG3, $[3],
|
||||
[Define to the type of arg 3 for ptrace.])
|
||||
AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG4, $[4],
|
||||
|
|
@ -89,4 +97,8 @@ if test -n "$[5]"; then
|
|||
AC_DEFINE_UNQUOTED(PTRACE_TYPE_ARG5, $[5],
|
||||
[Define to the type of arg 5 for ptrace.])
|
||||
fi
|
||||
|
||||
if test "$enable_build_with_cxx" = "yes"; then
|
||||
AC_LANG_POP([C++])
|
||||
fi
|
||||
])
|
||||
|
|
|
|||
Loading…
Reference in New Issue