Re: [ C Frontend / Preprocessor ] Embed Preprocessor Parameter Order

`constexpr foo_table[] =` { { 1, 2 }, { 3, 4 }, { 5, 6 }, }; ``` -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: Use of register keyword for Globals

On ARM64, Windows uses X18 as a pointer to thread-specific data. We have this declaration which we can't get rid of: register struct _TEB *__mingw_current_teb __asm__("x18"); -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: make error when builing gcc

d by failure to compile a simple C++ program, but the cause can vary: Your system might have no c++ compiler (which i think is unlikely), or the existent c++ compiler rejected the program due to an unknown option. You can take a look at the end of config.log. -- Best regards, LIU Hao OpenPGP_

Re: make error when builing gcc

e --enable-languages=c,c++,fortran --disable-multilib make -j$(nproc) ``` -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: How to remove extra assembly code"

2f6b1b742911ba0770b49bbb/mingw-w64-crt/crt/crtexe.c#L203-L267 [2] https://sourceware.org/binutils/docs/ld/WIN32.html -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: How to remove extra assembly code

My code is pure C language and does not need this code. How to remove the extra assembly code. The solution is to define `WinMain()` (or `wWinMain()` with the `-municode` option), where GCC will not insert `__main()`. Note the call still exists, before your main function is called. -- B

Re: Linking to windows library

ne it in one of your source files. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: New calling convention gotham_call

another register. I don't see a point in doing that. Not to mention that MOV can be implemented by register renaming which has a latency of zero. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: GCC 14.1.1 Status Report (2024-07-11)

lease take a look at PR115049 and decide whether it should block the release? Although this issue is reported about mingw-w64, I suspect Linux may be affected too. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: [PATCH v1] Remove 'restrict' from 'nptr' in strtol(3)-like functions

#x27;restrict'-qualified parameter // aliases with argument 1 -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: [PATCH] Fix rust on *-w64-mingw32

Attached is an alternative patch to functionalize `load_macros_array`. It allows GCC to build on x86_64-w64-mingw32. Not tested though, as I know no Rust. As before, please edit the patch at your disposal. -- Best regards, LIU Hao diff --git a/gcc/rust/checks/errors/borrowck/rust-borrow

Re: [PATCH] Fix rust on *-w64-mingw32

hing about Rust. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

[PATCH] Fix rust on *-w64-mingw32

Hello, Attached is a patch for fixing build issues on *-w64-mingw32. Please check and update at your leisure. 'gcc/system.h' contains a macro called `mkdir()` and there is no need to invoke `_mkdir()` within a conditional block. -- Best regards, LIU Hao diff --git a/gcc/rust/che

Re: Builtin for consulting value analysis (better ffs() code gen)

. The other branch below clearly eliminates the dependency.     }     else     {         // The architects say this is safe even for 0.         res = -1;     asm("bsf %1, %0" : "+r"(res) : "rm"(x));     }     return res + 1; } -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: RFC: Formalization of the Intel assembly syntax (PR53929)

This patch does not look so horrible: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53929#c26 -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: RFC: Formalization of the Intel assembly syntax (PR53929)

houldn't have checked for `*` right? The calls to `output_addr_const()` are from `dw2_assemble_integer (int size, rtx x)` in 'gcc/dwarf2asm.cc'. Now I need some directives on how to fix this; parsing the symbol seems awkward. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: RFC: Formalization of the Intel assembly syntax (PR53929)

"`, it would mean something very different and cause linker errors. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: RFC: Formalization of the Intel assembly syntax (PR53929)

h_mouse\AppData\Local\Temp\ccuyuu6c.s:29: Error: invalid use of register C:\Users\lh_mouse\AppData\Local\Temp\ccuyuu6c.s:29: Warning: register value used as expression lh_mouse@lhmouse-pc ~/Desktop $ ``` -- Best regards, LIU Hao From 2579afab42b90dceac860114acbad1ab79bca979 Mon Sep 17 00:

Re: RFC: Formalization of the Intel assembly syntax (PR53929)

t;bx"[rip] > as test.s -o test.o > objdump -d test.o test.o: file format pe-x86-64 (...) 0: 48 8d 05 00 00 00 00learax,[rip+0x0]# 7 <.text+0x7> 7: 90 nop So I think I had better try my patch in the next few days

Re: RFC: Formalization of the Intel assembly syntax (PR53929)

does not cause ambiguity, it can be accepted either way. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: RFC: Formalization of the Intel assembly syntax (PR53929)

ax noprefix; mov eax, DWORD PTR gs:0x48' -o a.o && objdump -Mintel -d a.o ... <.text>: 0:65 8b 04 25 48 00 00moveax,DWORD PTR gs:0x48 -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: RFC: Formalization of the Intel assembly syntax (PR53929)

so their compiler outputs do not really turn into assembly code before finally becoming target code. This approach is not subject to the ambiguity. As GCC still relies on GAS to produce object files, (as stated in the first paragraph,) it might make some sense to implement a strict mode on outputs

RFC: Formalization of the Intel assembly syntax (PR53929)

-- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: No subject

r supports Windows 7, but it's always possible to cross-compile from a supported system to Windows 7, or something even older like Windows XP or 2000. If you encounter an issue, please let me know. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re:

packages, we generally recommend https://www.msys2.org/. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: libgcov, fork, and mingw (and other targets without the full POSIX set)

d) #endif /* L_gcov_dump */ -#ifdef L_gcov_fork +#if defined L_gcov_fork && !defined _WIN32 /* A wrapper for the fork function. We reset counters in the child so that they are not counted twice. */ ``` -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: libgcov, fork, and mingw (and other targets without the full POSIX set)

. Calls to weak functions can jump to random, non-allocated memory and cause faults. Instead, duplicates of COMDAT sections are removed by the `.linkonce discard` directive. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: libgcov, fork, and mingw (and other targets without the full POSIX set)

iled. Makes sense. The target-specific macro `_WIN32` serves that purpose. However `fork()` doesn't actually exist there, and linking should indeed fail. Maybe `__gcov_fork()` shouldn't be defined at all. -- Best regards, LIU Hao OpenPGP_signature.asc Description: OpenPGP digital signature

Re: [PATCH 3/4] libbacktrace: work with aslr on windows

them for C++ [1] and GCC defines `NOMINMAX` in 'os_defines.h', so either way it is not necessary. [1] https://github.com/mingw-w64/mingw-w64/blob/3ebb92804e3125d1be8f61bcd42f15a8db15ba1e/mingw-w64-headers/include/minmax.h#L9 -- Best regards, LIU Hao OpenPGP_signature.asc

Request for update of documentation about `-mtune`

on my TigerLake CPU. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Warning specifically for a returning noreturn

)) // [[noreturn]] won't work int my_stream:: underflow() { throw std::invalid_argument("not implemented"); } ``` -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Will GCC eventually support SSE2 or SSE4.1?

x86 has very few GPRs and GCC doesn't optimize multi-word arithmetic very well. Performance may or may not vary depending on cache locality and number of μops; not to mention `movq` and `movd` which have relative high latencies. I would like to see some benchmarking results first

Re: Will GCC eventually support SSE2 or SSE4.1?

tion like this, you must do it yourself. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: End of subscription

ub, SourceForge, StackOverflow, ncurses etc. are marked as from mailing lists. I suspect there is kinda misconfiguration. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: gcc-12.3 cannot build gcc-ada on Cygwin

That look likes a private macro that prevents inclusion of 'msxml.h', which can identified by examining Windows headers. It's undocumented and probably shouldn't be defined by users. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: gcc-12.3 cannot build gcc-ada on Cygwin

for this issue is to add `-DCOM_NO_WINDOWS_H` in `CPPFLAGS` when building GCC. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: gcc parameter -mcrtdll= for choosing Windows C RunTime DLL library

-patc...@gcc.gnu.org with a CC to Jonathan Yong <10wa...@gmail.com>, who is the only maintainer on GCC for mingw-w64 port. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: a small C (naive) program faster with clang than with gcc

, it seems to make a difference only if the result is ever written back to memory. And for comparison, it makes completely no difference whether the operand is 32-bit or 8-bit, except when the operand is an 8-bit ?H register. [1] [1] https://uops.info/table.html -- Best regards, LIU Hao

Re: MIN/MAX and trapping math and NANs

在 2023/4/11 16:51, LIU Hao via Gcc 写道: My interpretation is that if one argument is a SNaN and the other is not, `fmax()` shall return the SNaN unchanged, without converting it to a QNaN. (F.10.9.2 The fmax functions, ISO/IEC 9899:2017) 'the other is not' means the other op

Re: MIN/MAX and trapping math and NANs

017) -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Buildbot (Sourceware): gcc - failed configure (failure) (master)

What should we do about it? A skull is neither descriptive nor informative, and is very unfriendly for message filters. A tag there might look much more helpful, such as [BUILDBOT] or [FAIL]. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: [PATCH 3/4] libbacktrace: work with aslr on windows

lling wide APIs explicitly, such overhead can be avoided. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Widening multiplication, but no narrowing division [i386/AMD64]

ption: ``` mov edx, 2 mov eax, edx # edx:eax = 0x20002 mov ecx, edx div ecx# division overflows because the quotient # can't stored into EAX ``` -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: B^HDEAD code generation (AMD64)

al ret ``` -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Why is there no libatomic default implementation using gthr.h?

Would you please do the same to libgomp too? -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: gcc parameter -mcrtdll= for choosing Windows C RunTime DLL library

this parameter is useful for more people. I vote +1 for this in GCC 14. GCC 13 (i.e. current master branch) is at stage3 so it's not an option at this moment. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: GNU = Junkware

在 2022-11-26 17:20, Dave Blanchard 写道: No, I'm not trolling, just venting here for a moment. So sick of garbage ass, crusty junkware that's always a battle to the death to accomplish anything. I really understand where Liu Hao was coming from yesterday when he was in here raging a

Re: Please, really, make `-masm=intel` the default for x86

ell, if that's your decision, fair enough. I can maintain my own distribution. Patch attached [1]; bootstrapped on {x86_64,1686}-w64-mingw32 without any issues so far. [1] https://github.com/lhmouse/MINGW-packages/blob/gcc-13/mingw-w64-gcc/9000-Deprecate-the-nonsense-AT-T-synax.patch -- Be

Re: Please, really, make `-masm=intel` the default for x86

在 2022/11/25 16:50, Marc Glisse 写道: On Fri, 25 Nov 2022, LIU Hao via Gcc wrote: I am a Windows developer and I have been writing x86 and amd64 assembly for more than ten years. One annoying thing about GCC is that, for x86 if I need to write I piece of inline assembly then I have to do it

Re: Please, really, make `-masm=intel` the default for x86

a lot of work to keep up with it all. I hope that, if we decide to make Intel syntax the default since GCC 14, then such crud will be eventually got rid of since GCC 24. OTOH, if we don't do that, we would have to live with it forever. -- Best regards, LIU Hao OpenPGP_signature Descri

Re: Please, really, make `-masm=intel` the default for x86

year-old evilness and refusing to move forward. Upgrading the compiler is always a big change, and updating sources should be expected, when we take `-Werror` into account. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Please, really, make `-masm=intel` the default for x86

to you, please consider how to write VFMADD231PD in AT&T syntax, really. I have been tired of such inconsistency. For God's sake, please deprecate it. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: [Mingw-w64-public] gcc parameter -mcrtdll= for choosing Windows C RunTime DLL library

aultlibs` to GCC, and specify desired libraries explicitly. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: [Mingw-w64-public] gcc parameter -mcrtdll= for choosing Windows C RunTime DLL library

efault-msvcrt=`, so they always match. [1] https://sourceforge.net/p/mingw-w64/mailman/message/36030072/ -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

GCC 13 bootstrap failure on i686-w64-mingw32

= strcspn (role, ":"); ``` -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: why does gcc jit require pthread?

. Thanks, I've pushed it to trunk now. Thank you for taking care of it! -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: why does gccgit require pthread?

ccess to GCC repo, and it takes a couple of hours for me to bootstrap GCC just for this tiny change. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: why does gccgit require pthread?

e not used inside GCC and the include of mutex should be done early. Well I am not familiar with such behavior. Feel free to amend the patch, until it looks good to you. I hope we can check this in before GCC 13 RC. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: why does gccgit require pthread?

lto,c++,fortran,objc,obj-c++` and with the `mcf` thread model; no errors observed. The built `libgccjit-0.dll` does not have imports from winpthread any more. Please review. -- Best regards, LIU Hao From ceb65f21b5ac23ce218efee82f40f641ebe44361 Mon Sep 17 00:00:00 2001 From: LIU Hao Date: Mon,

why does gccgit require pthread?

x27;gcc' subdirectory, so I suspect it isn't an option there? -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Issue with dllexport/dllimport inline function

ttribute__((__gnu_inline__)) __inline__ #endif extern int g_strcmp0(const char*str1, const char*str2); #ifndef INSIDE_FOO_C __attribute__((__gnu_inline__)) __inline__ #endif extern int g_strcmp0(const char*str1, const char*str2) { ... ``` -- Best regards, LIU Hao OpenPGP

Re: Issue with dllexport/dllimport inline function

27;: ``` #ifndef INSIDE_FOO_C __attribute__((__gnu_inline__)) __inline__ #endif extern int g_strcmp0(const char*str1, const char*str2) { ... ``` 'foo.c': ``` __attribute__((__dllexport__)) /* This is optional. */ extern int g_strcmp0 (const char *str1, const

Re: GCC trunk bootstrap failure on i686-w64-mingw32

在 2022-10-29 20:15, Eric Botcazou 写道: So what could be causing it? An oversight in https://gcc.gnu.org/pipermail/gcc-cvs/2022-August/370830.html has broken --disable-sjlj-exceptions. That's now fixed. Thank you. Rebuilding now. -- Best regards, LIU Hao OpenPGP_signature Descri

GCC trunk bootstrap failure on i686-w64-mingw32

could be causing it? Thanks in advance. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Issue with dllexport/dllimport inline function

line%60 -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Issue with dllexport/dllimport inline function

it, it should be seen as ``` __attribute__((__dllexport__)) extern inline int g_strcmp0(const char*, const char*) ``` There is no `gnu_inline` in this case. GCC always generates a COMDAT/weak/linkonce definition, which will not cause multiple definition errors.

Re: Issue with dllexport/dllimport inline function

在 2022/10/11 21:28, LIU Hao via Gcc 写道: Did you have any declarations that had no `__gnu_inline__`? GNU inline functions are supposed to be emitted out of line, even when its address is taken. This should be 'to be never emitted out of line'. Sorry for that. -- Best regard

Re: Issue with dllexport/dllimport inline function

在 2022/10/11 21:10, xclae...@gmail.com 写道: Le mardi 11 octobre 2022 à 13:00 +0800, LIU Hao a écrit : you may try    ```    __attribute__((__gnu_inline__))    extern inline    int g_strcmp0(const char*, const char*) { ...    ``` Thanks, I gave that a try but I get many: multiple

Re: Issue with dllexport/dllimport inline function

n is being defined in a DLL, `__dllexport__` should be used in place of `__gnu_inline__`. This may require another macro, similar to `GLIB_API`. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Using CMake for building GCC

://twdev.blog/2021/08/cmake/ -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: GCC 12.0.1 Status Report (2022-04-28)

en no problems. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Reqister to become gcc mirror site

ike that. `China, Taiwan, Hsinchu` is acceptable; `Taiwan` is not. -- Best regards, LIU Hao OpenPGP_signature Description: OpenPGP digital signature

Re: Bootstrap failure of GCC 11.1.1 on x86_64-w64-mingw32

t would be great as well. Thank you for the information. Reverting cfc9fdcec8861be0d11ec4493cca518bf5b4c32d made the build proceed again. I have created PR 101377 for it [1]. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101377 -- Best regards, LIU Hao OpenPGP_signature Descriptio

Bootstrap failure of GCC 11.1.1 on x86_64-w64-mingw32

have attached the build log in case you need it. -- Best regards, LIU Hao mingw-w64-gcc-mcf-11.1.1.d20210708.c11.g35aca8e9b45-1-x86_64-build.log.gz Description: application/gzip OpenPGP_signature Description: OpenPGP digital signature

Re: Why does printing a pointer cause it to escape?

void* ptr = 0; if(sscanf(buf, "%p", &ptr)) *(int*)ptr = 100; fprintf(stderr, "value = %d\n", value); // 100 instead of 42 } ``` -- Best regards, Liu Hao OpenPGP_signature Description: OpenPGP digital signature

Re: GCC trunk commit a325bdd195ee96f826b208c3afb9bed2ec077e12

hor), then rebased the modified commit onto ee52bf609bac. Git is smart enough to drop duplicate changes, but the leftovers formed a new commit, which was exactly a325bdd195e. -- Best regards, Liu Hao OpenPGP_signature Description: OpenPGP digital signature

Re: [RFC] Implementing detection of saturation and rounding arithmetic

; else return INT_MIN; } return res; } which can be optimized further as int f (int a, int b) { int res; if (__builtin_add_overflow (a, b, &res)) res = (a >> sizeof(int) * CHAR_BIT - 1) ^ INT_MAX; return res; } -- Best regards, Liu

Re: removing toxic emailers

在 17/04/2021 16.27, Aaron Gyes 写道: As far as I understand it Chris Punches lives in North America. Only 2% of the world population lives in the US, indeed, most live in China. It’s interesting the unkind reaction Liu Hao received in this very thread when they encountered the arguments making

Re: Copyright Assignment Form

table, and whether a disclaimer from an employer is needed, doesn't need to be done in public. The contributor might not want to discuss who their employer is on the public list, for example. Thanks for your information. -- Best regards, Liu Hao OpenPGP_signature Description:

Re: GCC association with the FSF

nese society and has almost eradicated sexism. It's something I can hardly understand why you (singular) still have a very vicious opinion on that. [I am not meant to participate in the discussion about the history and future of GCC.] -- Best regards, Liu Hao OpenPGP_signature Des

Re: Copyright Assignment Form

regards, Liu Hao OpenPGP_signature Description: OpenPGP digital signature

Re: gcc can't process some utf-8 characters

在 2021/1/14 上午9:47, Roy Qu via Gcc 写道: > I use "gcc -finput-charset=utf-8 -fexec-charset=gb2312" to compile utf-8 > encoding source files under windows. Most of the time it works well, but > when the source file contains some characters such as "—", gcc will fail > and the error message is: "[Err

Re: [RFC] Increase libstdc++ line length to 100(?) columns

在 2020/11/27 下午4:14, Richard Biener 写道: > > I prefer the ( on the next line. The argument list can be two spaces > indented from > the function name or "right justified" (I think the latter looks > visually better). > The right justification thing looks reasonable. For example, I think this ``

Re: [RFC] Increase libstdc++ line length to 100(?) columns

在 2020/11/27 上午7:50, Jonathan Wakely via Gcc 写道: > I've touched on the subject a few times, e.g. > https://gcc.gnu.org/pipermail/gcc/2019-December/230993.html > and https://gcc.gnu.org/pipermail/gcc/2019-December/231013.html > > Libstdc++ code is indented by 2 columns for the enclosing namespace,

Re: I absolutely despise the whole -fexec-charset and locale garbage.

在 2020/11/19 上午2:31, sotrdg sotrdg via Gcc 写道: > The locale shit is not thread safe. printf(“Hello World %d”,3) is undefined > behavior under none-UTF-8 exec-charset. WTF WTF WTF. > > This is purely garbage tbh. Just remove this toggle. I want encoding, I can > use another library. I do not need

Re: Coding style for C++ constructs going forward

在 2020/8/13 上午2:40, David Blaikie 写道: > > Then use of `auto*` would make it easier for you to spot use of plain > pointers in your projects & scrutinize them further? > My point is that `auto*` conveys no more information than `auto`. The absence of `*` does not imply the object (pointer) being

Re: Coding style for C++ constructs going forward

在 2020/8/11 下午9:55, Nathan Sidwell 写道: > > I agree, it's the way I use auto.  I particularly like the >    auto *foo = expr; > idiom, when you're getting a pointer, but the type of the pointee is clear.  > It informs how you use 'foo'. > > Personally I dislike this syntax. Pointers are objects

Re: Two new proposals to the upcoming C2X standard

在 2020/5/29 18:35, Andreas Schwab 写道: > On Mai 29 2020, David Brown wrote: > >> So my counter-proposal for you would be to recommend gcc's "typeof" as a >> new keyword (spelt "_Typeof", with "typeof" as a macro in , >> in solid C tradition). > > Or call it _Decltype/decltype, following C++. > >

Re: Usage of C11 Annex K Bounds-checking interfaces on GCC

在 2019/12/16 4:00, Jeffrey Walton 写道: > > If RTFM was going to work, then it would have happened in the last 50 > years or so. > > If error free programming was going to happen, then it would have > happened in the last 50 years or so. > > Come back to reality. > What's your point? Don't RTFM

Re: warning: conversion from ‘int’ to ‘char’ may change value

在 2018/9/20 22:08, Vincent Lefevre 写道: >> In C++, declaring n1 const avoids the warning regardless of >> optimization levels. > > If the constant propagation is done at -O0, this could explain > the behavior. > > Or do you mean that GCC remembers the type the data come from, > i.e. assuming char

Re: Bug 85667 - (x86_64) ms_abi rules aren't followed when returning short structs with float values

在 2018/9/19 16:52, lokesh janghel 写道: Hi, I am starting to looking into this issue. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85667#c0 We did some analysis about that issue and found that the problem occurs may be in the code generation phase in GCC. ABI says that struct type uses the int

Re: Can offsetting a non-null pointer result in a null one?

在 2018-08-20 16:27, Richard Biener 写道: > Btw, I can't find wording in the standards that nullptr + 1 is > invoking undefined behavior, > that is, that pointer arithmetic is only allowed on pointers pointing > to a valid object. > Any specific pointers? > The C standard only defines addition and s

Re: Can offsetting a non-null pointer result in a null one?

在 2018-08-15 12:48, Jeff Law 写道: I just don't think anyone's ever bothered to catch this case. I believe there is a BZ which touches on this issue. Yes, here it is: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78655 This PR uses a placement new as the example, which in GCC 8 assumes the poi

Can offsetting a non-null pointer result in a null one?

Dear GCC people, At the moment, with GCC 8.2, I compile the program ``` int foo(const char *p) { if(p == 0) return 2; const char *q = p + 1; if(q == 0) return 1; return 0; } ``` using ``` gcc-8 test.c -Wall -Wextra -Wpedantic -O3 -S ``` and get the following as

Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h

在 2018-08-10 18:53, Kim Gräsman 写道: I'm worried that this might only serve to trick the compiler. It shouldn't. If it was merely a trick then `std::aligned_storage` would be completely unusable. Explicitly using `-fno-strict-aliasing` for GCC < 6 would seem more direct to me -- as Jonathan

Re: [llvm-dev] GCC 5 and -Wstrict-aliasing in JSON.h

在 2018-08-10 06:20, Kim Gräsman 写道: On Fri, Aug 10, 2018 at 12:02 AM, Jonathan Wakely wrote: If GCC 4.9.3 thinks there's an aliasing violation it might misoptimise. It doesn't matter if it's right or not, it matters if it treats the code as undefined or not. And apparently GCC does think ther

Re: GCC 8 Ada bootstrap failure on mingw-w64

It has been long since this was reported. Today Alexey said he had found the reason. He believed that 899af040b0 was causing the failure [1]. After reverting it the x64 bootstrap succeeded, however the x86 bootstrap failed with an ICE [2]. So now we have two issues here. Should we file a new P

Re: About a error reported by gcc

在 2018/7/5 9:14, snow_xmas 写道: Hello. The source in the attachment can not be compiled, because there is a variable in the lambda-introducer does not have a copy-constructor, but have a move-constructor. When a function object constructed by a lambda-expression like this, the compiler wil

Re: __builtin_isnormal question

在 2018/6/5 4:44, Steve Ellcey 写道: Is there a bug in __builtin_isnormal or am I just confused as to what it means? There doesn't seem to be any actual definition/documentation for the function. __builtin_isnormal(0.0) is returning false. That seems wrong to me, 0.0 is a normal (as opposed to a

Re: GCC 8 Ada bootstrap failure on mingw-w64

在 2018/6/2 18:11, Eric Botcazou 写道: Any ideas about how to resolve this? Compare with a known working version (e.g. GCC 7) and find the discrepancy. Hmm there would be a huge amount of code to check. It seems to me that it is GNATLINK that causes the error. As I have absolutely no knowledge

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