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bug#21309: libtool generates binary data in config.log due to buggy esca
From: |
Vincent Lefevre |
Subject: |
bug#21309: libtool generates binary data in config.log due to buggy escaping |
Date: |
Tue, 2 Oct 2018 12:58:04 +0200 |
User-agent: |
Mutt/1.10.1+101 (b181996c) vl-108074 (2018-09-27) |
retitle 21309 libtool should not use the dangerous, undocumented AC_TRY_EVAL
macro, currently broken
thanks
On 2018-10-02 11:12:52 +0200, Vincent Lefevre wrote:
> In libtool.m4, this corresponds to:
>
> nlist=conftest.nm
> if AC_TRY_EVAL(NM conftest.$ac_objext \| "$lt_cv_sys_global_symbol_pipe"
> \> $nlist) && test -s "$nlist"; then
>
> Thus the problem seems to come from AC_TRY_EVAL, i.e. an autoconf bug.
I've seen in the autoconf source that AC_TRY_EVAL should not be used:
# AC_TRY_EVAL(VARIABLE)
# ---------------------
# Evaluate $VARIABLE, which should be a valid shell command.
# The purpose of this macro is to write "configure:123: command line"
# into config.log for every test run.
#
# The AC_TRY_EVAL and AC_TRY_COMMAND macros are dangerous and
# undocumented, and should not be used.
# They may be removed or their API changed in a future release.
# Autoconf itself no longer uses these two macros; they are present
# only for backward compatibility with previous versions of Autoconf.
# Not every shell command will work due to problems with eval
# and quoting, and the rules for exactly what does work are tricky.
# Worse, due to double-expansion during evaluation, arbitrary unintended
# shell commands could be executed in some situations.
--
Vincent Lefèvre <address@hidden> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)