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| author | Simon Marchi <simon.marchi@ericsson.com> | 2017-12-30 23:33:26 -0500 |
|---|---|---|
| committer | Simon Marchi <simon.marchi@ericsson.com> | 2017-12-30 23:33:26 -0500 |
| commit | cfa27c399ec9236a100ef794505d35f60da41a6d (patch) | |
| tree | bdb4efc8167d569517f1225e16944d4b802df7a0 /gdb/common | |
| parent | 132448f8359a268f34f074b0908b5255b568da06 (diff) | |
Only ignore -Wenum-compare-switch if it exists
My patch
dwarf2read: Silence -Wenum-compare-switch warning
132448f8359a268f34f074b0908b5255b568da06
made some parts of dwarf2read.c ignore warnings about switch using enums
of different kinds. What I did not realize was that older Clang
versions (prior to 6) did not have that warning, and therefore give this
error:
/home/emaisin/src/binutils-gdb/gdb/dwarf2read.c:24187:7: error: unknown warning group '-Wenum-compare-switch', ignored [-Werror,-Wunknown-pragmas]
DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
^
/home/emaisin/src/binutils-gdb/gdb/common/diagnostics.h:42:3: note: expanded from macro 'DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES'
DIAGNOSTIC_IGNORE ("-Wenum-compare-switch")
^
/home/emaisin/src/binutils-gdb/gdb/common/diagnostics.h:27:3: note: expanded from macro 'DIAGNOSTIC_IGNORE'
_Pragma (STRINGIFY (GCC diagnostic ignored option))
^
<scratch space>:10:25: note: expanded from here
GCC diagnostic ignored "-Wenum-compare-switch"
^
Clang has a way to test if it knows about a particular warning. This
patch uses that feature to only define
DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES to something if the
warning is recognized by the Clang version being used. I tested
building dwarf2read.c with clang 4, 5, 6, as well as gcc.
gdb/ChangeLog:
* common/diagnostics.h
(DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES): Only
define if the compiler knows about -Wenum-compare-switch.
Diffstat (limited to 'gdb/common')
| -rw-r--r-- | gdb/common/diagnostics.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gdb/common/diagnostics.h b/gdb/common/diagnostics.h index 30c0fd6172..c9ef6b645f 100644 --- a/gdb/common/diagnostics.h +++ b/gdb/common/diagnostics.h @@ -38,9 +38,12 @@ DIAGNOSTIC_IGNORE ("-Wdeprecated-register") # define DIAGNOSTIC_IGNORE_UNUSED_FUNCTION \ DIAGNOSTIC_IGNORE ("-Wunused-function") -# define DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES \ - DIAGNOSTIC_IGNORE ("-Wenum-compare-switch") - +# if __has_warning ("-Wenum-compare-switch") +# define DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES \ + DIAGNOSTIC_IGNORE ("-Wenum-compare-switch") +# else +# define DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES +# endif #elif defined (__GNUC__) /* GCC */ # define DIAGNOSTIC_IGNORE_SELF_MOVE |