[racket-dev] Build failures since 5.2

From: James McCoy (jamessan at debian.org)
Date: Sat Feb 18 21:17:36 EST 2012

Hi all,

Since 5.2, racket has been failing to build on some of Debian's less
mainstream architectures where it had been building fine with 5.1.3.
The failure scenario below is common among a few of the architectures
(armel[0], s390[1], s390x[2])

[0]: https://buildd.debian.org/status/fetch.php?pkg=racket&arch=armel&ver=5.2.1%2Bdfsg1-1&stamp=1329603367
[1]: https://buildd.debian.org/status/fetch.php?pkg=racket&arch=s390&ver=5.2.1%2Bdfsg1-1&stamp=1329602283
[2]: https://buildd.debian.org/status/fetch.php?pkg=racket&arch=s390x&ver=5.2.1%2Bdfsg1-1&stamp=1329601933

make[4]: Entering directory `/build/racket-5.2.1+dfsg1/build/racket/gc2'
mkdir xsrc/usr/bin/make xsrc/precomp.h
make[5]: Entering directory `/build/racket-5.2.1+dfsg1/build/racket/gc2'
env XFORM_PRECOMP=yes ../racketcgc -cqu /build/racket-5.2.1+dfsg1/src/racket/gc2/xform.rkt --setup . --cpp "gcc -E -I./.. -I/build/racket-5.2.1+dfsg1/src/racket/gc2/../include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 "  --keep-lines -o xsrc/precomp.h /build/racket-5.2.1+dfsg1/src/racket/gc2/precomp.c
...d/racket-5.2.1+dfsg1/collects/racket/private/reqprov.rkt:161:8: expand: unbound identifier in module (in phase 1, transformer environment) in: recur-pre
make[5]: *** [xsrc/precomp.h] Error 1
make[5]: Leaving directory `/build/racket-5.2.1+dfsg1/build/racket/gc2'

I took a look at one of Debian's wiki pages[3] to see if there was any
commonality among those architectures which could explain this.

[3]: http://wiki.debian.org/ArchitectureSpecificsMemo

They all, unlike many others, use unsigned char by default.  Adding
"-fsigned-char" to CFLAGS fixes the issue.  So it seems something was
added between 5.1.3 and 5.2 that is sensitive to char signedness but
doesn't explicitly declare the sign for char, like a lot of the code
base does.

GPG Key: 4096R/331BA3DB 2011-12-05 James McCoy <jamessan at debian.org>
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