From: Luis Machado Date: Wed, 11 Dec 2019 14:55:49 +0000 (-0300) Subject: Fix unused function error X-Git-Url: http://git.efficios.com/?p=deliverable%2Fbinutils-gdb.git;a=commitdiff_plain;h=39f34d7b64ee76e07b82a3e57800905d249d8005 Fix unused function error Attempting to build GDB in Ubuntu 16.04.6 LTS on x86_64, I ran into warnings that caused the build to fail: binutils-gdb/gdb/gdbsupport/safe-strerror.c:44:1: error: ‘char* select_strerror_r(char*, char*)’ defined but not used [-Werror=unused-function] select_strerror_r (char *res, char *) The diagnostic macro DIAGNOSTIC_IGNORE_UNUSED_FUNCTION seems to expand correctly to its respective pragma, but this doesn't seem to have an effect on the warning. I tried to use the pragma explicitly and got the same result. ATTRIBUTE_UNUSED works fine in this case if you put it in both functions, which should fix warnings for both gdb and gdbserver builds. The compiler version is gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 20160609. This is likely the result of PR64079 in GCC, which was fixed by commit 9e96f1e1b9731c4e1ef4fbbbf0997319973f0537. To prevent other developers from attempting to use this macro, only to get confused by it not working as expected, it seems better to not define this particular macro. gdb/ChangeLog: 2019-12-12 Luis Machado * gdbsupport/safe-strerror.c: Don't include diagnostics.h. (select_strerror_r): Use ATTRIBUTE_UNUSED instead of the diagnostics macros. include/ChangeLog: 2019-12-12 Luis Machado * diagnostics.h (DIAGNOSTIC_IGNORE_UNUSED_FUNCTION). Remove definitions. Change-Id: Iad6123d61d76d111e3ef8d24aa8c60112304c749 --- diff --git a/gdb/ChangeLog b/gdb/ChangeLog index c80c540351..5ac4f9cb95 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,9 @@ +2019-12-12 Luis Machado + + * gdbsupport/safe-strerror.c: Don't include diagnostics.h. + (select_strerror_r): Use ATTRIBUTE_UNUSED instead of the diagnostics + macros. + 2019-12-11 Tom Tromey * tui/tui-win.c (tui_set_win_height_command): Call diff --git a/gdb/gdbsupport/safe-strerror.c b/gdb/gdbsupport/safe-strerror.c index 9973fa6785..a5ddf74835 100644 --- a/gdb/gdbsupport/safe-strerror.c +++ b/gdb/gdbsupport/safe-strerror.c @@ -18,7 +18,6 @@ along with this program. If not, see . */ #include "common-defs.h" -#include "diagnostics.h" #include /* There are two different versions of strerror_r; one is GNU-specific, the @@ -27,27 +26,20 @@ to solve this for us because IPA does not use Gnulib but uses this function. */ -/* We only ever use one of the two overloads, so suppress the warning for - an unused function. */ -DIAGNOSTIC_PUSH -DIAGNOSTIC_IGNORE_UNUSED_FUNCTION - /* Called if we have a XSI-compliant strerror_r. */ -static char * +ATTRIBUTE_UNUSED static char * select_strerror_r (int res, char *buf) { return res == 0 ? buf : nullptr; } /* Called if we have a GNU strerror_r. */ -static char * +ATTRIBUTE_UNUSED static char * select_strerror_r (char *res, char *) { return res; } -DIAGNOSTIC_POP - /* Implementation of safe_strerror as defined in common-utils.h. */ const char * diff --git a/include/ChangeLog b/include/ChangeLog index 52cdc0407c..1444cc9146 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,8 @@ +2019-12-12 Luis Machado + + * diagnostics.h (DIAGNOSTIC_IGNORE_UNUSED_FUNCTION). Remove + definitions. + 2019-12-11 Alan Modra * opcode/mmix.h (PUSHGO_INSN_BYTE): Make unsigned. diff --git a/include/diagnostics.h b/include/diagnostics.h index 2adaa4d3a0..019ade2567 100644 --- a/include/diagnostics.h +++ b/include/diagnostics.h @@ -53,8 +53,6 @@ DIAGNOSTIC_IGNORE ("-Wdeprecated-declarations") # define DIAGNOSTIC_IGNORE_DEPRECATED_REGISTER \ DIAGNOSTIC_IGNORE ("-Wdeprecated-register") -# define DIAGNOSTIC_IGNORE_UNUSED_FUNCTION \ - DIAGNOSTIC_IGNORE ("-Wunused-function") # if __has_warning ("-Wenum-compare-switch") # define DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES \ DIAGNOSTIC_IGNORE ("-Wenum-compare-switch") @@ -65,9 +63,6 @@ #elif defined (__GNUC__) /* GCC */ -# define DIAGNOSTIC_IGNORE_UNUSED_FUNCTION \ - DIAGNOSTIC_IGNORE ("-Wunused-function") - # define DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION \ DIAGNOSTIC_IGNORE ("-Wstringop-truncation") @@ -88,10 +83,6 @@ # define DIAGNOSTIC_IGNORE_DEPRECATED_REGISTER #endif -#ifndef DIAGNOSTIC_IGNORE_UNUSED_FUNCTION -# define DIAGNOSTIC_IGNORE_UNUSED_FUNCTION -#endif - #ifndef DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES # define DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES #endif