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https://issues.apache.org/jira/browse/TS-1091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191256#comment-13191256
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Leif Hedstrom commented on TS-1091:
-----------------------------------
Would it not be possible to make a regex that captures all the "cases"? Perhaps
something like (untested)
s/ *-w */ /g
? It means we might have an additional whitespace in the CFLAGs, but that seems
ok :).
> `./configure CFLAGS=-w` causes configure script to wrongly guess style of
> `gethostbyname_r` on OS X (and probably other BSDs)
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: TS-1091
> URL: https://issues.apache.org/jira/browse/TS-1091
> Project: Traffic Server
> Issue Type: Bug
> Components: Build
> Affects Versions: 3.0.2
> Environment: OS X 10.6.8
> Reporter: Marc Abramowitz
> Priority: Minor
> Labels: autoconf, build, configure
> Original Estimate: 10m
> Remaining Estimate: 10m
>
> {code}
> marca@SCML-MarcA:~/src/trafficserver-3.0.2$ system_profiler -detailLevel mini
> | grep 'System Version'
> System Version: Mac OS X 10.6.8 (10K549)
> marca@SCML-MarcA:~/src/trafficserver-3.0.2$ ./configure CFLAGS=-w
> ...
> checking style of gethostbyname_r routine... glibc2
> checking 3rd argument to the gethostbyname_r routines... hostent_data
> configure: Build using CC=gcc
> configure: Build using CXX=g++
> configure: Build using CPP=gcc -E
> configure: Build using CFLAGS=-w -g -pipe -Wall -Werror -O3
> -feliminate-unused-debug-symbols -fno-strict-aliasing...
> {code}
> Arguably, people should never run configure with CFLAGS=-w and this might
> seem stupid and something that should never happen, but it turns out that
> Homebrew (http://mxcl.github.com/homebrew/) does this by default
> (https://github.com/mxcl/homebrew/issues/9728) -- I discovered this while
> writing a Homebrew formula for Traffic Server
> (https://github.com/mxcl/homebrew/pull/9513). After discovering that this was
> causing problems, I modified my formula to tell Homebrew not to do this and
> all is well, but I thought it would be interesting to make Traffic Server
> resistant to this as well.
> I first tried to enable warnings by trying to find a gcc #pragma that could
> go in the conftest.c code, but I could not find any #pragma that seemed to do
> this.
> I ended up making a small change to `build/common.m4` that strips -w out of
> CFLAGS using `sed`.
> {code}
> --- build/common.m4.2012-01-22-092051 2011-05-25 13:19:54.000000000 -0700
> +++ build/common.m4 2012-01-22 22:48:14.000000000 -0800
> @@ -177,6 +177,7 @@
> if test "$ac_cv_prog_gcc" = "yes"; then
> CFLAGS="$CFLAGS -Werror"
> fi
> + CFLAGS=$(echo $CFLAGS | sed -e 's/^-w$//' -e 's/^-w //' -e 's/ -w$//' -e
> 's/ -w / /')
> AC_COMPILE_IFELSE([AC_LANG_SOURCE([
> [#include "confdefs.h"
> ]
> {code}
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