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Re: passing flags to C compiler but not to C++ compiler

From: Robert Boehne
Subject: Re: passing flags to C compiler but not to C++ compiler
Date: Sat, 27 Jul 2013 15:24:33 -0500
User-agent: Mozilla/5.0 (X11; SunOS i86pc; rv:14.0) Gecko/20120714 Thunderbird/14.0

On 07/27/13 00:32, Vincent Torri wrote:

in my sources, i have both C and C++ files. Something like

my_lib_la_SOURCES = foo.c foo.cpp

I want to pass, for example, -Wdeclaration-after-statement to gcc. Hence,
when compiling foo.cpp, i have the warning :

cc1plus.exe: warning: command line option '-Wdeclaration-after-statement'
is valid for C/ObjC but not for C++

How can I remove this warning when compiling c++ files ?

thank you

Vincent Torri

I misread - for C and not C++ you should set "CFLAGS"

./configure CFLAGS="-g -O2 -Wdeclaration-after-statement" CXXFLAGS="-g -O2"

for example.  If you want to pass something to the preprocessor,
it's used by both C and C++, use CPPFLAGS
CPPFLAGS="-DSYMBOL=value -I/path/to/headers"

You can set them in the environment, but if you use the syntax where it's after
the configure in the command, those settings will be saved in config.log
so you can see what they were set to when you built.


Robert Boehne

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