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[patch #8707] AX_APPEND_COMPILE_FLAGS: -Wno-FOO doesn't work with gcc
From: |
anonymous |
Subject: |
[patch #8707] AX_APPEND_COMPILE_FLAGS: -Wno-FOO doesn't work with gcc |
Date: |
Sun, 26 Jul 2015 11:27:53 +0000 |
User-agent: |
Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:39.0) Gecko/20100101 Firefox/39.0 |
URL:
<http://savannah.gnu.org/patch/?8707>
Summary: AX_APPEND_COMPILE_FLAGS: -Wno-FOO doesn't work with
gcc
Project: GNU Autoconf Archive
Submitted by: None
Submitted on: So 26 Jul 2015 11:27:51 UTC
Priority: 5 - Normal
Status: None
Assigned to: None
Originator Email: address@hidden
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
I'd like to add -Wno-incompatible-library-redeclaration for clang. The
obvious
MY_APPEND_COMPILE_FLAGS([-Wno-incompatible-library-redeclaration])
does not work, because it adds it when using gcc, too.
The macro's description states:
For every FLAG1, FLAG2 it is checked whether the compiler works with the
flag. If it does, the flag is added FLAGS-VARIABLE
It doesn't quite work for gcc when FLAG1 is of the form -Wno-FOO,
because:
When an unrecognized warning option is requested (e.g.,
'-Wunknown-warning'), GCC emits a diagnostic stating that the option is not
recognized. However, if the '-Wno-' form is used, the behavior is slightly
different: no diagnostic is produced for '-Wno-unknown-warning' unless other
diagnostics are being produced. This allows the use of new '-Wno-' options
with old compilers, but if something goes wrong, the compiler warns that an
unrecognized option is present.
https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
An obvious way to make it work is testing -WFOO instead of -Wno-FOO.
Crude patch attached.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: So 26 Jul 2015 11:27:51 UTC Name: ax_append_compile_flags.patch Size:
572B By: None
<http://savannah.gnu.org/patch/download.php?file_id=34528>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/patch/?8707>
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