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how to adjust default CFLAGS="-g -O2"?
From: |
Bruno Haible |
Subject: |
how to adjust default CFLAGS="-g -O2"? |
Date: |
Thu, 7 Aug 2008 00:41:06 +0200 |
User-agent: |
KMail/1.5.4 |
Hi,
This has now come up in several GNU packages. How can a package specify
that the default CFLAGS should be something different than "-g -O2" - when gcc
is used and does accept these flags?
- GNU clisp prefers
"-g -O2 -W -Wswitch -Wcomment -Wpointer-arith -Wimplicit -Wreturn-type
-Wno-sign-compare"
- GNU teseq prefers
"-g -O2 -Wall -ansi -pedantic-errors"
see <http://lists.gnu.org/archive/html/bug-teseq/2008-08/msg00005.html>
- The issue has come up before, see
<http://lists.gnu.org/archive/html/autoconf/2006-04/msg00045.html>
Ralf Wildenhues said:
"In general, overridability is more important than the special-casing."
But autoconf still hardwires this logic in _AC_PROG_CC_G:
---------------------------------------------
elif test $ac_cv_prog_cc_g = yes; then
if test "$GCC" = yes; then
CFLAGS="-g -O2"
else
CFLAGS="-g"
fi
else
if test "$GCC" = yes; then
CFLAGS="-O2"
else
CFLAGS=
fi
fi
---------------------------------------------
Could this be made customizable somehow? Either through a variable that the
developer could set in his configure.ac before the invocation of AC_PROG_CC,
or through a macro which he could redefine in his configure.ac?
The rationale for making this customizable per package is that the set of
warning options that yields the maximum benefit (= best adherence to the
package's coding conventions and minimum number of false warnings) depends
on the package's source code.
Bruno
- how to adjust default CFLAGS="-g -O2"?,
Bruno Haible <=