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Bug #41908 CFLAGS="-Os" ./configure --enable-debug fails
Submitted: 2007-07-05 17:06 UTC Modified: 2007-07-06 10:44 UTC
Votes:1
Avg. Score:2.0 ± 0.0
Reproduced:0 of 1 (0.0%)
From: christian at hoffie dot info Assigned:
Status: Closed Package: Compile Failure
PHP Version: 5.2.3 OS: Gentoo Linux
Private report: No CVE-ID: None
View Add Comment Developer Edit
 [2007-07-05 17:06 UTC] christian at hoffie dot info 
Description:
------------
PHP's configure script incorrectly manipulates CFLAGS and CXXFLAGS when running with --enable-debug or --enable-gcov. When CFLAGS or CXXFLAGS contains -Os (optimize for size), the configure script builds a bad list of CFLAGS/CXXFLAGS and as such configure fails in a later stage.
I created a small patch[1] which should solve that, I'm not completely sure whether it's a good idea to remove that -O stuff at all -- does appending -O0 after user-supplied flags not lead to the expected result (building with -O0 and not -O2 for instance)?

[1] http://overlays.gentoo.org/proj/php/browser/patches/php-patches/5.2.3/5.2.3/php5.2.3-configure-Os-fix.patch?rev=1237

Reproduce code:
---------------
CFLAGS="-Os" ./configure --enable-debug
(same if you replace CFLAGS by CXXFLAGS or --enable-debug with --enable-gcov)

Actual result:
--------------
christian@tux /tmp/php-5.2.3 $ env | grep FLAGS
CXXFLAGS=-Os
CFLAGS=-Os
christian@tux /tmp/php-5.2.3 $ ./configure --disable-all --enable-debug
[...]
Configuring libtool
checking build system type... i686-pc-linux-gnu
checking for ld used by gcc... /usr/i686-pc-linux-gnu/bin/ld
checking if the linker (/usr/i686-pc-linux-gnu/bin/ld) is GNU ld... yes
checking for /usr/i686-pc-linux-gnu/bin/ld option to reload object files... -r
checking for BSD-compatible nm... /usr/bin/nm -B
checking how to recognise dependent libraries... pass_all
checking for object suffix... configure: error: installation or configuration problem; compiler does not work


Depending on ./configure options the output looks different. For example, with --with-xml you will see a libxml2 failure first.

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 [2007-07-06 09:02 UTC] tony2001@php.net 
>does appending -O0 after user-supplied flags not lead to the
>expected result (building with -O0 and not -O2 for instance)?

Apparently it doesn't.
What does you config.log say about the reason of the failure?
 [2007-07-06 10:34 UTC] christian at hoffie dot info 
>>does appending -O0 after user-supplied flags not lead to the
>>expected result (building with -O0 and not -O2 for instance)?
> Apparently it doesn't.
Don't know if I undestood you correctly -- that CFLAGS manipulation using sed is there because CFLAGS="-O2 -O0" doesn't lead to code being built with -O0, right?

> What does you config.log say about the reason of the failure?

config.log:
[...]
configure:106983: checking for object suffix
configure:106989: gcc -c s -O0 -g -Wall  conftest.c 1>&5
gcc: s: No such file or directory

(this is the last time this message appears and causes the configure run abort; it happens multiple times as expected, as CFLAGS="s" is simply wrong; full config.log at http://home.hoffie.info/php-5.2.3-debug-Os-config.log)
 [2007-07-06 10:44 UTC] tony2001@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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