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Re: C++ preprocessor and multi-line string literals

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On 22.01.2020 11:58, boltar@nowhere.org wrote:
> On Tue, 21 Jan 2020 19:25:06 +0200
> Paavo Helde <myfirstname@osa.pri.ee> wrote:
>> On 21.01.2020 18:43, boltar@nowhere.org wrote:
>>> Not with Clang you can't:
>>>
>>> t.c:3:27: warning: missing terminating '"' character [-Winvalid-pp-token]
>>> #define GLSL_COMMON_FUNC R"#(
>>>                             ^
>>> t.c:7:1: error: expected identifier or '('
>>> )#"
>>> ^
>>> t.c:7:3: warning: missing terminating '"' character [-Winvalid-pp-token]
>>> )#"
>>>
>>> Is this a gcc extension?
>>>
>>
>> https://godbolt.org/ shows that this compiles fine with clang 6.0.0 and
>> later. Clang 5.0.0 indeed fails - it looks like it's time to upgrade,
>> the current version is 9.0.0.
>
> They can say it compiles fine all they like, I'm telling you it doesn't:
>
> fenris$ clang -v
> Apple LLVM version 10.0.1 (clang-1001.0.46.4)
> Target: x86_64-apple-darwin18.7.0
> Thread model: posix
> InstalledDir: /Library/Developer/CommandLineTools/usr/bin
[...]
> fenris$ c++ t.cc

And how is this 'c++' program related to the 'clang' program you used 
for -v?

> t.cc:1:27: warning: missing terminating '"' character [-Winvalid-pp-token]
> #define GLSL_COMMON_FUNC R"#(
>                            ^
> t.cc:4:1: error: expected expression
>> }
> ^
> t.cc:4:2: error: expected expression
>> }
>   ^
> t.cc:5:1: error: expected unqualified-id
>> )#"
> ^
> t.cc:5:4: warning: missing terminating '"' character [-Winvalid-pp-token]
>> )#"
>     ^
> 2 warnings and 3 errors generated.

Your example works fine with my clang:

gemma$ clang++ -v
clang version 7.0.1 (tags/RELEASE_701/final 349238)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/7
Found candidate GCC installation: /usr/lib64/gcc/x86_64-suse-linux/7
Selected GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/7
Candidate multilib: .;@m64
Selected multilib: .;@m64
gemma$ cat test1.cpp
#include <iostream>

#define GLSL_COMMON_FUNC R"#(
float func(float f) {
         return 0.0;
}
)#"

int main()
{
         std::cout << GLSL_COMMON_FUNC;
}
gemma$ clang++ test1.cpp
gemma$ ./a.out

float func(float f) {
         return 0.0;
}

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Thread

C++ preprocessor and multi-line string literals Paavo Helde <myfirstname@osa.pri.ee> - 2020-01-16 17:37 +0200
  Re: C++ preprocessor and multi-line string literals Öö Tiib <ootiib@hot.ee> - 2020-01-16 09:46 -0800
    Re: C++ preprocessor and multi-line string literals Manfred <noname@add.invalid> - 2020-01-16 22:49 +0100
      Re: C++ preprocessor and multi-line string literals Öö Tiib <ootiib@hot.ee> - 2020-01-16 14:43 -0800
        Re: C++ preprocessor and multi-line string literals Manfred <invalid@add.invalid> - 2020-01-17 01:24 +0100
          Re: C++ preprocessor and multi-line string literals Öö Tiib <ootiib@hot.ee> - 2020-01-16 16:38 -0800
            Re: C++ preprocessor and multi-line string literals Manfred <invalid@add.invalid> - 2020-01-17 03:27 +0100
  Re: C++ preprocessor and multi-line string literals legalize+jeeves@mail.xmission.com (Richard) - 2020-01-16 20:07 +0000
  Re: C++ preprocessor and multi-line string literals Juha Nieminen <nospam@thanks.invalid> - 2020-01-20 13:53 +0000
    Re: C++ preprocessor and multi-line string literals Paavo Helde <myfirstname@osa.pri.ee> - 2020-01-20 18:31 +0200
    Re: C++ preprocessor and multi-line string literals Bonita Montero <Bonita.Montero@gmail.com> - 2020-01-20 18:19 +0100
      Re: C++ preprocessor and multi-line string literals Juha Nieminen <nospam@thanks.invalid> - 2020-01-21 08:24 +0000
        Re: C++ preprocessor and multi-line string literals boltar@nowhere.org - 2020-01-21 16:43 +0000
          Re: C++ preprocessor and multi-line string literals Paavo Helde <myfirstname@osa.pri.ee> - 2020-01-21 19:25 +0200
            Re: C++ preprocessor and multi-line string literals boltar@nowhere.org - 2020-01-22 09:58 +0000
              Re: C++ preprocessor and multi-line string literals guinness.tony@gmail.com - 2020-01-22 02:11 -0800
                Re: C++ preprocessor and multi-line string literals boltar@nowhere.org - 2020-01-22 10:24 +0000
                Re: C++ preprocessor and multi-line string literals James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-23 22:25 -0500
              Re: C++ preprocessor and multi-line string literals Paavo Helde <myfirstname@osa.pri.ee> - 2020-01-22 13:28 +0200
                Re: C++ preprocessor and multi-line string literals boltar@nowhere.org - 2020-01-22 12:07 +0000
                Re: C++ preprocessor and multi-line string literals Öö Tiib <ootiib@hot.ee> - 2020-01-22 05:33 -0800
                Re: C++ preprocessor and multi-line string literals boltar@nowhere.org - 2020-01-22 16:03 +0000
                Re: C++ preprocessor and multi-line string literals Öö Tiib <ootiib@hot.ee> - 2020-01-22 10:50 -0800
                Re: C++ preprocessor and multi-line string literals boltar@nowhere.org - 2020-01-23 09:22 +0000
                Re: C++ preprocessor and multi-line string literals Manfred <noname@add.invalid> - 2020-01-22 18:59 +0100
              Re: C++ preprocessor and multi-line string literals Juha Nieminen <nospam@thanks.invalid> - 2020-01-22 12:03 +0000

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