From 91ee7171d0886731900ab0238ce3795241d877a4 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 17 Nov 2015 15:17:45 +0000 Subject: [PATCH] MinGW and attribute format(printf/gnu_printf) Cross building gdbserver for --host=x86_64-w64-mingw32 with gcc 4.8.4 20141219 (Fedora MinGW 4.8.4-1.fc20), I get: src/gdb/gdbserver/tracepoint.c: In function 'cmd_qtdp': src/gdb/gdbserver/tracepoint.c:2577:7: error: unknown conversion type character 'l' in format [-Werror=format=] trace_debug ("Defined %stracepoint %d at 0x%s, " ^ src/gdb/gdbserver/tracepoint.c:2577:7: error: unknown conversion type character 'l' in format [-Werror=format=] src/gdb/gdbserver/tracepoint.c:2577:7: error: too many arguments for format [-Werror=format-extra-args] src/gdb/gdbserver/tracepoint.c: In function 'stop_tracing': src/gdb/gdbserver/tracepoint.c:3447:7: error: unknown conversion type character 'l' in format [-Werror=format=] trace_debug ("Stopping the trace because " ^ src/gdb/gdbserver/tracepoint.c:3447:7: error: too many arguments for format [-Werror=format-extra-args] src/gdb/gdbserver/tracepoint.c: In function 'collect_data_at_tracepoint': src/gdb/gdbserver/tracepoint.c:4651:3: error: unknown conversion type character 'l' in format [-Werror=format=] trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64, ^ src/gdb/gdbserver/tracepoint.c:4651:3: error: too many arguments for format [-Werror=format-extra-args] src/gdb/gdbserver/tracepoint.c: In function 'collect_data_at_step': src/gdb/gdbserver/tracepoint.c:4687:3: error: unknown conversion type character 'l' in format [-Werror=format=] trace_debug ("Making new step traceframe for " ^ trace_debug is a macro that calls: static void trace_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2); The calls that fail checking use PRIu64, etc., like: trace_debug ("Defined %stracepoint %d at 0x%s, " "enabled %d step %" PRIu64 " pass %" PRIu64, tpoint->type == fast_tracepoint ? "fast " : tpoint->type == static_tracepoint ? "static " : "", tpoint->number, paddress (tpoint->address), tpoint->enabled, tpoint->step_count, tpoint->pass_count); gnulib's stdio/printf module replacements may make %llu, etc. work on mingw, instead of the MS-specific %I64u, and thus may make PRIu64 expand to %llu. However, gcc isn't aware of that, because libiberty's ansidecl.h defines ATTRIBUTE_PRINTF as using attribute format(printf). But, with that format, gcc checks for MS-style format strings (%I64u). In order to have gcc expect gnu/standard formats, we need to use gnu_printf format instead. Which version to use (printf/gnu_printf) depends on msvcrt and mingw version, and so gnulib has a configure-time check, and defines _GL_ATTRIBUTE_FORMAT_PRINTF accordingly. Since _GL_ATTRIBUTE_FORMAT_PRINTF is compatible with ATTRIBUTE_PRINTF, the fix is simply to make use of the former. gdb/ChangeLog: 2015-11-17 Pedro Alves * common/common-defs.h (ATTRIBUTE_PRINTF): Redefine in terms of _GL_ATTRIBUTE_FORMAT_PRINTF after including ansidecl.h. --- gdb/ChangeLog | 5 +++++ gdb/common/common-defs.h | 9 +++++++++ 2 files changed, 14 insertions(+) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index d326b9c..044140e 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,10 @@ 2015-11-17 Pedro Alves + * common/common-defs.h (ATTRIBUTE_PRINTF): Redefine in terms of + _GL_ATTRIBUTE_FORMAT_PRINTF after including ansidecl.h. + +2015-11-17 Pedro Alves + * common/common-defs.h (__STDC_CONSTANT_MACROS) (__STDC_LIMIT_MACROS): Define before including stdint.h. diff --git a/gdb/common/common-defs.h b/gdb/common/common-defs.h index 548fe42..acea663 100644 --- a/gdb/common/common-defs.h +++ b/gdb/common/common-defs.h @@ -51,7 +51,16 @@ #include #include #include + #include "ansidecl.h" +/* This is defined by ansidecl.h, but we prefer gnulib's version. On + MinGW, gnulib might enable __USE_MINGW_ANSI_STDIO, which may or not + require use of attribute gnu_printf instead of printf. gnulib + checks that at configure time. Since _GL_ATTRIBUTE_FORMAT_PRINTF + is compatible with ATTRIBUTE_PRINTF, simply use it. */ +#undef ATTRIBUTE_PRINTF +#define ATTRIBUTE_PRINTF _GL_ATTRIBUTE_FORMAT_PRINTF + #include "libiberty.h" #include "pathmax.h" #include "gdb/signals.h" -- 2.7.4