[libvirt] [PATCH] fix failure when building with --disable-debug
When building with --disable-debug, VIR_DEBUG expands to a nop. But parameters to VIR_DEBUG can be variables that are passed only to VIR_DEBUG. In the case the building system complains about unused variables. --- src/libvirt_private.syms | 1 + src/util/logging.c | 15 +++++++++++++++ src/util/logging.h | 3 ++- 3 files changed, 18 insertions(+), 1 deletion(-) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index b173590..48c4df7 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -739,6 +739,7 @@ virLockManagerRelease; # logging.h +virEatParam; virLogDefineFilter; virLogDefineOutput; virLogEmergencyDumpAll; diff --git a/src/util/logging.c b/src/util/logging.c index f8233cd..999dd01 100644 --- a/src/util/logging.c +++ b/src/util/logging.c @@ -1262,3 +1262,18 @@ void virLogSetFromEnv(void) { if (debugEnv && *debugEnv) virLogParseOutputs(debugEnv); } + +/** + * virEatParam: + * + * Do nothing but eat parameters. See VIR_DEBUG_INT. + * + * Currently only VIR_DEBUG_INT uses this function, which could + * have been defined right before VIR_DEBUG_INT, but it makes + * `make syntax-check' unhappy about ATTRIBUTE_UNUSED appearing + * in .h file. + */ +void virEatParam(void *unused ATTRIBUTE_UNUSED, ...) +{ + /* do nothing */ +} diff --git a/src/util/logging.h b/src/util/logging.h index 70318d0..b96a115 100644 --- a/src/util/logging.h +++ b/src/util/logging.h @@ -35,7 +35,7 @@ virLogMessage(category, VIR_LOG_DEBUG, f, l, 0, __VA_ARGS__) # else # define VIR_DEBUG_INT(category, f, l, ...) \ - do { } while (0) + virEatParam((void*)category, f, l, __VA_ARGS__) # endif /* !ENABLE_DEBUG */ # define VIR_INFO_INT(category, f, l, ...) \ @@ -142,4 +142,5 @@ extern void virLogVMessage(const char *category, int priority, va_list vargs) ATTRIBUTE_FMT_PRINTF(6, 0); extern int virLogSetBufferSize(int size); extern void virLogEmergencyDumpAll(int signum); +void virEatParam(void *unused, ...); #endif -- 1.7.10.2
On Wed, Jul 11, 2012 at 05:05:24PM +0800, Hu Tao wrote:
When building with --disable-debug, VIR_DEBUG expands to a nop. But parameters to VIR_DEBUG can be variables that are passed only to VIR_DEBUG. In the case the building system complains about unused variables. --- src/libvirt_private.syms | 1 + src/util/logging.c | 15 +++++++++++++++ src/util/logging.h | 3 ++- 3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index b173590..48c4df7 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -739,6 +739,7 @@ virLockManagerRelease;
# logging.h +virEatParam; virLogDefineFilter; virLogDefineOutput; virLogEmergencyDumpAll; diff --git a/src/util/logging.c b/src/util/logging.c index f8233cd..999dd01 100644 --- a/src/util/logging.c +++ b/src/util/logging.c @@ -1262,3 +1262,18 @@ void virLogSetFromEnv(void) { if (debugEnv && *debugEnv) virLogParseOutputs(debugEnv); } + +/** + * virEatParam: + * + * Do nothing but eat parameters. See VIR_DEBUG_INT. + * + * Currently only VIR_DEBUG_INT uses this function, which could + * have been defined right before VIR_DEBUG_INT, but it makes + * `make syntax-check' unhappy about ATTRIBUTE_UNUSED appearing + * in .h file. + */ +void virEatParam(void *unused ATTRIBUTE_UNUSED, ...) +{ + /* do nothing */ +}
Could you in fact put this in logging.h and mark it 'inline' so the compiler does away with it entirely, but still thinks the params are used ?
diff --git a/src/util/logging.h b/src/util/logging.h index 70318d0..b96a115 100644 --- a/src/util/logging.h +++ b/src/util/logging.h @@ -35,7 +35,7 @@ virLogMessage(category, VIR_LOG_DEBUG, f, l, 0, __VA_ARGS__) # else # define VIR_DEBUG_INT(category, f, l, ...) \ - do { } while (0) + virEatParam((void*)category, f, l, __VA_ARGS__) # endif /* !ENABLE_DEBUG */
# define VIR_INFO_INT(category, f, l, ...) \ @@ -142,4 +142,5 @@ extern void virLogVMessage(const char *category, int priority, va_list vargs) ATTRIBUTE_FMT_PRINTF(6, 0); extern int virLogSetBufferSize(int size); extern void virLogEmergencyDumpAll(int signum); +void virEatParam(void *unused, ...);
Oh and rename it to: s/virEatParam/virLogEatParam/ Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
On Wed, Jul 11, 2012 at 10:45:17AM +0100, Daniel P. Berrange wrote:
On Wed, Jul 11, 2012 at 05:05:24PM +0800, Hu Tao wrote:
When building with --disable-debug, VIR_DEBUG expands to a nop. But parameters to VIR_DEBUG can be variables that are passed only to VIR_DEBUG. In the case the building system complains about unused variables. --- src/libvirt_private.syms | 1 + src/util/logging.c | 15 +++++++++++++++ src/util/logging.h | 3 ++- 3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index b173590..48c4df7 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -739,6 +739,7 @@ virLockManagerRelease;
# logging.h +virEatParam; virLogDefineFilter; virLogDefineOutput; virLogEmergencyDumpAll; diff --git a/src/util/logging.c b/src/util/logging.c index f8233cd..999dd01 100644 --- a/src/util/logging.c +++ b/src/util/logging.c @@ -1262,3 +1262,18 @@ void virLogSetFromEnv(void) { if (debugEnv && *debugEnv) virLogParseOutputs(debugEnv); } + +/** + * virEatParam: + * + * Do nothing but eat parameters. See VIR_DEBUG_INT. + * + * Currently only VIR_DEBUG_INT uses this function, which could + * have been defined right before VIR_DEBUG_INT, but it makes + * `make syntax-check' unhappy about ATTRIBUTE_UNUSED appearing + * in .h file. + */ +void virEatParam(void *unused ATTRIBUTE_UNUSED, ...) +{ + /* do nothing */ +}
Could you in fact put this in logging.h and mark it 'inline' so the compiler does away with it entirely, but still thinks the params are used ?
but `make syntax-check' will fail. -- Thanks, Hu Tao
On Wed, Jul 11, 2012 at 05:54:51PM +0800, Hu Tao wrote:
On Wed, Jul 11, 2012 at 10:45:17AM +0100, Daniel P. Berrange wrote:
On Wed, Jul 11, 2012 at 05:05:24PM +0800, Hu Tao wrote:
When building with --disable-debug, VIR_DEBUG expands to a nop. But parameters to VIR_DEBUG can be variables that are passed only to VIR_DEBUG. In the case the building system complains about unused variables. --- src/libvirt_private.syms | 1 + src/util/logging.c | 15 +++++++++++++++ src/util/logging.h | 3 ++- 3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index b173590..48c4df7 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -739,6 +739,7 @@ virLockManagerRelease;
# logging.h +virEatParam; virLogDefineFilter; virLogDefineOutput; virLogEmergencyDumpAll; diff --git a/src/util/logging.c b/src/util/logging.c index f8233cd..999dd01 100644 --- a/src/util/logging.c +++ b/src/util/logging.c @@ -1262,3 +1262,18 @@ void virLogSetFromEnv(void) { if (debugEnv && *debugEnv) virLogParseOutputs(debugEnv); } + +/** + * virEatParam: + * + * Do nothing but eat parameters. See VIR_DEBUG_INT. + * + * Currently only VIR_DEBUG_INT uses this function, which could + * have been defined right before VIR_DEBUG_INT, but it makes + * `make syntax-check' unhappy about ATTRIBUTE_UNUSED appearing + * in .h file. + */ +void virEatParam(void *unused ATTRIBUTE_UNUSED, ...) +{ + /* do nothing */ +}
Could you in fact put this in logging.h and mark it 'inline' so the compiler does away with it entirely, but still thinks the params are used ?
but `make syntax-check' will fail.
Opps, yes, sorry I didn't read your comment. I suggest just whitelisting the logging.h file in cfg.mk so that we don't apply that check to this file Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
participants (2)
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Daniel P. Berrange -
Hu Tao