./configure --prefix=/ breaks, won't build C modules

[jas11c]

BPO	1644987
Nosy	@jcea, @ronaldoussoren, @tarekziade, @serwy, @merwok, @bitdancer

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2012-06-22.18:40:34.238>
created_at = <Date 2007-01-26.05:34:09.000>
labels = ['build', 'library']
title = "./configure --prefix=/ breaks, won't build C modules"
updated_at = <Date 2012-06-22.18:51:55.984>
user = 'https://bugs.python.org/jas11c'

bugs.python.org fields:

activity = <Date 2012-06-22.18:51:55.984>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2012-06-22.18:40:34.238>
closer = 'jcea'
components = ['Build', 'Distutils']
creation = <Date 2007-01-26.05:34:09.000>
creator = 'jas11c'
dependencies = []
files = []
hgrepos = []
issue_num = 1644987
keywords = []
message_count = 3.0
messages = ['61056', '163453', '163458']
nosy_count = 7.0
nosy_names = ['jcea', 'ronaldoussoren', 'tarek', 'jas11c', 'roger.serwy', 'eric.araujo', 'r.david.murray']
pr_nums = []
priority = 'low'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue1644987'
versions = ['Python 2.6']

[jas11c]

This appears to be a new issue with Python 2.5
Building Python 2.5 on Fedora Core 5:

./configure --prefix=/ --enable-shared
make

fails to build the C modules, as a "-L." is missing from the gcc command line used to generate the module.so file from the module.o file.

Using any other value for --prefix works.

Setting the environment variable LDFLAGS to "-L." before running ./configure appears to be a successful workaround.

Here is a representative failure (all the C modules fail). Note the "cannot find -lpython2.5" message; this is because -L. is missing frmo the gcc command line.

building 'crypt' extension
gcc -pthread -fPIC -fno-strict-aliasing -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -I. -I/local/home/jas/Software/Languages/Python/Python-2.5/./Include -I./Include -I. -I/usr/local/include -I/local/home/jas/Software/Languages/Python/Python-2.5/Include -I/local/home/jas/Software/Languages/Python/Python-2.5 -c /local/home/jas/Software/Languages/Python/Python-2.5/Modules/cryptmodule.c -o build/temp.linux-i686-2.5/local/home/jas/Software/Languages/Python/Python-2.5/Modules/cryptmodule.o
gcc -pthread -shared build/temp.linux-i686-2.5/local/home/jas/Software/Languages/Python/Python-2.5/Modules/cryptmodule.o -L//lib -L/usr/local/lib -L/lib/python2.5/config -lcrypt -lpython2.5 -o build/lib.linux-i686-2.5/crypt.so
/usr/bin/ld: cannot find -lpython2.5
collect2: ld returned 1 exit status

[jcea]

Closing, since this is ancient. Please, open a new bug if still relevant (for 2.7, 3.2 or 3.3).

[bitdancer]

I took the five minutes to test this. It does not fail in 2.7. I remember we fixed some other issues with '-prefix=/', so I presume this got fixed at that time as a byproduct. Either that, or it was a Fedora bug of some sort.