Hi! While mass-building a cross-gcc, I noticed that for alpha-dec-vms/alpha64-dec-vms, recent GCC versions correctly throw a warning due to a multi-statement define that gets rippen in an if/else case:
[all 2021-09-12 15:51:55] /usr/lib/gcc-snapshot/bin/g++ -fno-PIE -c -g -O2
-DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I.
-I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include
-I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libcody
-I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/dpd
-I../libdecnumber -I../../gcc/gcc/../libbacktrace -o value-prof.o -MT
value-prof.o -MMD -MP -MF ./.deps/value-prof.TPo ../../gcc/gcc/value-prof.c
[all 2021-09-12 15:52:01] /usr/lib/gcc-snapshot/bin/g++ -fno-PIE -c -g -O2
-DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I.
-I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include
-I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libcody
-I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/dpd
-I../libdecnumber -I../../gcc/gcc/../libbacktrace -o var-tracking.o -MT
var-tracking.o -MMD -MP -MF ./.deps/var-tracking.TPo
../../gcc/gcc/var-tracking.c
[all 2021-09-12 15:52:03] In file included from ./tm.h:21,
[all 2021-09-12 15:52:03] from ../../gcc/gcc/backend.h:28,
[all 2021-09-12 15:52:03] from ../../gcc/gcc/var-tracking.c:91:
[all 2021-09-12 15:52:03] ../../gcc/gcc/var-tracking.c: In function 'void
prepare_call_arguments(basic_block, rtx_insn*)':
[all 2021-09-12 15:52:03] ../../gcc/gcc/config/alpha/vms.h:148:3: error: macro
expands to multiple statements [-Werror=multistatement-macros]
[all 2021-09-12 15:52:03] 148 | (CUM).num_args = 0;
\
[all 2021-09-12 15:52:03] | ^
[all 2021-09-12 15:52:03] ../../gcc/gcc/var-tracking.c:6334:17: note: in
expansion of macro 'INIT_CUMULATIVE_ARGS'
[all 2021-09-12 15:52:03] 6334 | INIT_CUMULATIVE_ARGS
(args_so_far_v, type, NULL_RTX, fndecl,
[all 2021-09-12 15:52:03] | ^~~~~~~~~~~~~~~~~~~~
[all 2021-09-12 15:52:03] ../../gcc/gcc/var-tracking.c:6332:15: note: some
parts of macro expansion are not guarded by this 'else' clause
[all 2021-09-12 15:52:03] 6332 | else
[all 2021-09-12 15:52:03] | ^~~~
[all 2021-09-12 15:52:20] cc1plus: all warnings being treated as errors
[all 2021-09-12 15:52:20] make[1]: *** [Makefile:1143: var-tracking.o] Error 1
[all 2021-09-12 15:52:20] make[1]: Leaving directory
'/var/lib/laminar/run/gcc-alpha64-dec-vms/8/toolchain-build/gcc'
[all 2021-09-12 15:52:20] make: *** [Makefile:4425: all-gcc] Error 2
gcc/ChangeLog:
* config/alpha/vms.h (INIT_CUMULATIVE_ARGS): Wrap multi-statment
define into a block.
diff --git a/gcc/config/alpha/vms.h b/gcc/config/alpha/vms.h
index b8673b6b6fb..e979aef10c7 100644
--- a/gcc/config/alpha/vms.h
+++ b/gcc/config/alpha/vms.h
@@ -145,9 +145,13 @@ typedef struct {int num_args; enum avms_arg_type
atypes[6];} avms_arg_info;
#undef INIT_CUMULATIVE_ARGS
#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
- (CUM).num_args = 0; \
- (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \
- (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
+ do \
+ { \
+ (CUM).num_args = 0; \
+ (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \
+ (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64; \
+ } \
+ while (0)
#define DEFAULT_PCC_STRUCT_RETURN 0
Okay for trunk?
Thanks,
Jan-Benedict
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