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authorSimon Marchi <simon.marchi@polymtl.ca>2021-12-02 08:23:12 -0500
committerSimon Marchi <simon.marchi@polymtl.ca>2021-12-02 08:24:25 -0500
commit6cade9185cc55478830559d91593ba510bef1b17 (patch)
tree58c0950a7b559e2e65f03993dbbad3aaa2b9c7cd /include
parent1075011adebffc855319569549ce88e389e149c6 (diff)
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gdb, include: replace pragmas with DIAGNOSTIC macros, fix build with g++ 4.8
When introducing this code, I forgot that we had some macros for this. Replace some "manual" pragma diagnostic with some DIAGNOSTIC_* macros, provided by include/diagnostics.h. In diagnostics.h: - Add DIAGNOSTIC_ERROR, to enable a diagnostic at error level. - Add DIAGNOSTIC_ERROR_SWITCH, to enable -Wswitch at error level, for both gcc and clang. Additionally, using DIAGNOSTIC_PUSH, DIAGNOSTIC_ERROR_SWITCH and DIAGNOSTIC_POP seems to misbehave with g++ 4.8, where we see these errors: CXX ada-tasks.o /home/smarchi/src/binutils-gdb/gdb/ada-tasks.c: In function void read_known_tasks(): /home/smarchi/src/binutils-gdb/gdb/ada-tasks.c:998:10: error: enumeration value ADA_TASKS_UNKNOWN not handled in switch [-Werror=switch] switch (data->known_tasks_kind) ^ Because of the POP, the diagnostic should go back to being disabled, since it was disabled in the beginning, but that's not what we see here. Versions of GCC >= 5 compile correctly. Work around this by making DIAGNOSTIC_ERROR_SWITCH a no-op for GCC < 5. Note that this code (already as it exists in master today) enables -Wswitch at the error level even if --disable-werror is passed. It shouldn't be a problem, as it's not like a new enumerator will appear out of nowhere and cause a build error if building with future compilers. Still, for correctness, we would ideally want to ask the compiler to enable -Wswitch at its default level (as if the user had passed -Wswitch on the command-line). There doesn't seem to be a way to do this. Change-Id: Id33ebec3de39bd449409ea0bab59831289ffe82d
Diffstat (limited to 'include')
-rw-r--r--include/diagnostics.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/diagnostics.h b/include/diagnostics.h
index f6fd30e..7b3f6db 100644
--- a/include/diagnostics.h
+++ b/include/diagnostics.h
@@ -40,6 +40,8 @@
# define DIAGNOSTIC_IGNORE(option) \
_Pragma (DIAGNOSTIC_STRINGIFY (GCC diagnostic ignored option))
+# define DIAGNOSTIC_ERROR(option) \
+ _Pragma (DIAGNOSTIC_STRINGIFY (GCC diagnostic error option))
#else
# define DIAGNOSTIC_PUSH
# define DIAGNOSTIC_POP
@@ -61,6 +63,9 @@
# define DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL \
DIAGNOSTIC_IGNORE ("-Wformat-nonliteral")
+# define DIAGNOSTIC_ERROR_SWITCH \
+ DIAGNOSTIC_ERROR ("-Wswitch")
+
#elif defined (__GNUC__) /* GCC */
# if __GNUC__ >= 7
@@ -74,6 +79,13 @@
# define DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL \
DIAGNOSTIC_IGNORE ("-Wformat-nonliteral")
+/* GCC 4.8's "diagnostic push/pop" seems broken when using this, -Wswitch
+ remains enabled at the error level even after a pop. Therefore, don't
+ use it for GCC < 5. */
+# if __GNUC__ >= 5
+# define DIAGNOSTIC_ERROR_SWITCH DIAGNOSTIC_ERROR ("-Wswitch")
+# endif
+
#endif
#ifndef DIAGNOSTIC_IGNORE_SELF_MOVE
@@ -100,4 +112,8 @@
# define DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
#endif
+#ifndef DIAGNOSTIC_ERROR_SWITCH
+# define DIAGNOSTIC_ERROR_SWITCH
+#endif
+
#endif /* DIAGNOSTICS_H */