[issue24506] make fails with gcc 4.9 due to fatal warning of unused variable and empty macro in Parser/pgen.c

[Irit Katriel]

Irit Katriel  added the comment:

This macro is no longer in the codebase.

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nosy: +iritkatriel
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue24506] make fails with gcc 4.9 due to fatal warning of unused variable and empty macro in Parser/pgen.c

[Karl Richter]

New submission from Karl Richter:

`gcc` 4.9 is more restictive and recognizes that the empty definition of the 
`REQN` macro doesn't use some variables. It's more suitable to wrap the usage 
of the macro in the same preprocessor conditionals like the macro definition.

experienced with 41fbc222af8c503e1659250a36f4e293d864a92b

Patch attached. Tests pass (see 
https://semaphoreci.com/krichter/cpython/branches/empty_macro/builds/1 for 
details).

--
components: Build
files: 0001-removed-empty-definition-of-REQN-preprocessor-macro-.patch
keywords: patch
messages: 245781
nosy: krichter
priority: normal
severity: normal
status: open
title: make fails with gcc 4.9 due to fatal warning of unused variable and 
empty macro in Parser/pgen.c
versions: Python 2.7
Added file: 
http://bugs.python.org/file39806/0001-removed-empty-definition-of-REQN-preprocessor-macro-.patch

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[issue24506] make fails with gcc 4.9 due to fatal warning of unused variable and empty macro in Parser/pgen.c

[Meador Inge]

Meador Inge added the comment:

What is the exact GCC revision and what are the error messages?  I just tried 
GCC 4.9.3 and GCC 4.10.0 and don't see the errors.

Also, what configure and make parameters did you use to trigger the error?
I did './configure --with-pydebug' and './configure' with 'make -j4'.

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[issue24506] make fails with gcc 4.9 due to fatal warning of unused variable and empty macro in Parser/pgen.c

[Karl Richter]

Karl Richter added the comment:

It's a fatal warning of `gcc 4.9.2`, not an error (my bad) for `int i;` in 
`Parser/pgen.c` line 227. It might be ignored as well, but I think my approach 
is more elegant and deals with issues sooner than later.

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