From f90160dfe1d8b05bfec4f1be976c0e5a2e39a57f Mon Sep 17 00:00:00 2001
From: tsteven4 <13596209+tsteven4@users.noreply.github.com>
Date: Wed, 26 Apr 2023 17:02:18 -0600
Subject: [PATCH] add gnu attributes to addtional printf like functions (#1088)

* add gnu attribute for format string checks on additional functions.

* silence msvc whining about unknown attributes.

In c++17 unknown attributes should be ignored without causing an error.
But these warnings are excessive:
"warning C5030: attribute 'gnu::format' is not recognized"
---
 CMakeLists.txt | 2 +-
 defs.h         | 2 +-
 gbfile.h       | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 505e306f9..664e662fd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -310,7 +310,7 @@ endif()
 if(MSVC)
   target_compile_definitions(gpsbabel PRIVATE _CRT_SECURE_NO_WARNINGS)
   target_compile_definitions(gpsbabel PRIVATE _CRT_NONSTDC_NO_WARNINGS)
-  target_compile_options(gpsbabel PRIVATE /MP -wd4100 -wd4267)
+  target_compile_options(gpsbabel PRIVATE /MP -wd4100 -wd4267 -wd5030)
 endif()
 
 if(APPLE)
diff --git a/defs.h b/defs.h
index f2e67f490..674ead1b7 100644
--- a/defs.h
+++ b/defs.h
@@ -1021,7 +1021,7 @@ int str_match(const char* str, const char* match);
 [[gnu::format(printf, 2, 3)]] int xasprintf(char** strp, const char* fmt, ...);
 [[gnu::format(printf, 2, 3)]] int xasprintf(QString* strp, const char* fmt, ...);
 [[gnu::format(printf, 2, 3)]] int xasprintf(QScopedPointer<char, QScopedPointerPodDeleter>& strp, const char* fmt, ...);
-int xvasprintf(char** strp, const char* fmt, va_list ap);
+[[gnu::format(printf, 2, 0)]] int xvasprintf(char** strp, const char* fmt, va_list ap);
 char* strupper(char* src);
 char* strlower(char* src);
 time_t mklocaltime(std::tm* time);
diff --git a/gbfile.h b/gbfile.h
index 24be29378..a2f7257e9 100644
--- a/gbfile.h
+++ b/gbfile.h
@@ -104,8 +104,8 @@ QByteArray gbfreadbuf(gbsize_t size, gbfile* file);
 int gbfgetc(gbfile* file);
 QString gbfgets(char* buf, int len, gbfile* file);
 
-int gbvfprintf(gbfile* file, const char* format, va_list ap);
-int gbfprintf(gbfile* file, const char* format, ...);
+[[gnu::format(printf, 2, 0)]] int gbvfprintf(gbfile* file, const char* format, va_list ap);
+[[gnu::format(printf, 2, 3)]] int gbfprintf(gbfile* file, const char* format, ...);
 int gbfputc(int c, gbfile* file);
 int gbfputs(const QString& s, gbfile* file);
 int gbfwrite(const void* buf, gbsize_t size, gbsize_t members, gbfile* file);
-- 
2.30.2