[Bug preprocessor/94367] New: pragma GCC diagnostics messes up with one line "if" blocks without curly braces

[romain.geissler at amadeus dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94367

            Bug ID: 94367
           Summary: pragma GCC diagnostics messes up with one line "if"
                    blocks without curly braces
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: romain.geissler at amadeus dot com
  Target Milestone: ---

Hi,

It looks like "if" blocks without curly braces cannot be surrounded by pragma
diagnostics. It looks like this is a very old issue, gcc 4.6 already seem to
have this problem on Compiler Explorer. Clang raises no such error.

void f()
{
    if (true)
#pragma GCC diagnostic push
        ;
#pragma GCC diagnostic pop
    else
        ;
}


<source>: In function 'void f()':
<source>:7:5: error: 'else' without a previous 'if'
    7 |     else
      |     ^~~~
Compiler returned: 1
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