Misc warnings #2801

seanm · 2022-03-07T19:19:09Z

No description provided.

vitaut

Thanks for the PR.

vitaut · 2022-03-07T19:57:20Z

include/fmt/compile.h

@@ -36,7 +36,7 @@ template <typename OutputIt> class truncating_iterator_base {
  using difference_type = std::ptrdiff_t;
  using pointer = void;
  using reference = void;
-  using _Unchecked_type =
+  using Unchecked_type_ =


This will introduce warnings in MSVC, please revert.

What warning would it introduce?

Underscore followed by uppercase is reserved in C++: https://en.cppreference.com/w/cpp/language/identifiers

Warnings about (un)checked iterators.

Is _Unchecked_type some kind of Microsoft extension keyword?

Sort of. It's not a keyword but some mechanism to opt out iterators.

Could we somewhere do something like:

#if defined(_MSC_VER) #define fmt_unchecked_type _Unchecked_type #else #define fmt_unchecked_type #endif

If you have access to MSVC 2015, I'd recommend checking if removing _Unchecked_type altogether still produces warnings. It might be no longer the case as IIRC they have been moving away from the checked iterators. You could even submit a test PR to the fmt repo and check warnings in appveyor: https://ci.appveyor.com/project/vitaut/fmt.

Actually, we can see on this PR that there are definitely more warnings: https://ci.appveyor.com/project/vitaut/fmt/builds/42816914/job/briwktqjiiw9oa34. The macro approach seems OK but note that macros should be uppercase.

OK, see new attempt.

vitaut · 2022-03-07T19:57:29Z

include/fmt/core.h

@@ -1498,7 +1498,7 @@ class appender : public std::back_insert_iterator<detail::buffer<char>> {
 public:
  using std::back_insert_iterator<detail::buffer<char>>::back_insert_iterator;
  appender(base it) noexcept : base(it) {}
-  using _Unchecked_type = appender;  // Mark iterator as checked.
+  using Unchecked_type_ = appender;  // Mark iterator as checked.


test/test-main.cc

vitaut · 2022-03-09T19:03:25Z

include/fmt/compile.h

@@ -8,6 +8,7 @@
 #ifndef FMT_COMPILE_H_
 #define FMT_COMPILE_H_

+#include "core.h"


This is not needed: core.h is a lightweight alternative to format.h, it doesn't make sense to include it when format.h is included.

vitaut · 2022-03-09T19:07:17Z

include/fmt/core.h

+#ifdef _MSC_VER
+#  define FMT_UNCHECKED_TYPE _Unchecked_type
+#else
+#  define FMT_UNCHECKED_TYPE DummyName
+#endif


Let's change it into:

#define FMT_UNCHECKED_ITERATOR(It) using _Unchecked_type = It; // Mark iterator as checked.

to simplify call sites.

vitaut · 2022-03-09T19:07:57Z

include/fmt/core.h

@@ -2002,11 +2008,11 @@ using format_args = basic_format_args<format_context>;
 // We cannot use enum classes as bit fields because of a gcc bug
 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414.
 namespace align {
-enum type { none, left, right, center, numeric };
+enum type : unsigned { none, left, right, center, numeric };


Why unsigned?

As per commit message: to fix the -Wsigned-enum-bitfield warnings.

test/posix-mock-test.cc

vitaut · 2022-03-10T20:13:44Z

include/fmt/compile.h

+  using FMT_UNCHECKED_TYPE =
      truncating_iterator_base;  // Mark iterator as checked.


This should be `FMT_UNCHECKED_TYPE(truncating_iterator_base);

Doh, sorry I missed that one. Fixed.

vitaut · 2022-03-10T20:14:40Z

include/fmt/core.h

+#  define FMT_UNCHECKED_ITERATOR(It) using _Unchecked_type = It; // Mark iterator as checked.
+#else
+#  define FMT_UNCHECKED_ITERATOR(It) using DummyTypeName = It;


Let's remove trailing semicolons since those are added at call sites.

Ah, good point. Fixed.

test/posix-mock-test.cc

vitaut · 2022-03-11T16:20:34Z

Please fix build failures.

vitaut · 2022-03-11T17:24:07Z

And apply clang-format.

seanm · 2022-03-15T18:42:13Z

Please fix build failures.

I don't understand that error. I played on godbolt, and it seems to me like a gcc bug fixed between 9.2 and 9.3:

https://godbolt.org/z/58aEv8zEq

Interesting, the warning goes away if I change the enum from unsigned to unsigned char. Shall we do that?

vitaut · 2022-03-15T19:19:11Z

Interesting, the warning goes away if I change the enum from unsigned to unsigned char. Shall we do that?

If that resolves the issue then sure.

vitaut · 2022-03-17T17:25:23Z

There are still build failures.

vitaut · 2022-03-24T04:05:24Z

Do you still plan working on this PR?

seanm · 2022-03-24T13:41:53Z

Do you still plan working on this PR?

Yes. But I'm at a loss as to why that old gcc complains. I don't have a means to reproduce it locally.

I guess I could split that one commit out so the rest can be merged...

Avoid defining various reserved identifiers (starting with underscore and capital letter). Fortunately, they were all Windows-only, so it was easy to conditionalize them in Window-only preprocessor checks.

Created FMT_UNCHECKED_TYPE that resolves to special identifier _Unchecked_type for Microsoft, but to a dummy string otherwise. Using _Unchecked_type is invalid because underscore + uppercase is a reserved identifier.

vitaut · 2022-03-24T14:33:47Z

Thanks

vitaut requested changes Mar 7, 2022

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phprus reviewed Mar 8, 2022

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test/test-main.cc Show resolved Hide resolved

seanm force-pushed the misc-warnings branch from 69430ff to b30e335 Compare March 9, 2022 18:28

vitaut requested changes Mar 9, 2022

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seanm force-pushed the misc-warnings branch from b30e335 to b9560da Compare March 9, 2022 19:58

vitaut requested changes Mar 10, 2022

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seanm force-pushed the misc-warnings branch from b9560da to bce2c3b Compare March 10, 2022 20:37

seanm force-pushed the misc-warnings branch from bce2c3b to 9adbbcd Compare March 15, 2022 19:38

seanm added 2 commits March 24, 2022 09:57

Fixed all clang -Wreserved-id-macro warnings (on macOS at least)

c6d7691

Avoid defining various reserved identifiers (starting with underscore and capital letter). Fortunately, they were all Windows-only, so it was easy to conditionalize them in Window-only preprocessor checks.

Fixed clang -Wreserved-identifier warings

098b9d2

Created FMT_UNCHECKED_TYPE that resolves to special identifier _Unchecked_type for Microsoft, but to a dummy string otherwise. Using _Unchecked_type is invalid because underscore + uppercase is a reserved identifier.

seanm force-pushed the misc-warnings branch from 9adbbcd to 098b9d2 Compare March 24, 2022 13:58

vitaut approved these changes Mar 24, 2022

View reviewed changes

vitaut merged commit 5379063 into fmtlib:master Mar 24, 2022

seanm mentioned this pull request May 8, 2022

Fixed all clang -Wsigned-enum-bitfield warnings #2882

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Misc warnings #2801

Misc warnings #2801

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vitaut commented Mar 24, 2022

		using FMT_UNCHECKED_TYPE =
		truncating_iterator_base; // Mark iterator as checked.

Misc warnings #2801

Misc warnings #2801

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seanm commented Mar 7, 2022

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vitaut Mar 8, 2022 • edited

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vitaut commented Mar 11, 2022

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edited