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Bug 89887 - AM_PROG_LIBTOOL test for "compiler '-c -o' support" contains extra test and therefore can be invalid
AM_PROG_LIBTOOL test for "compiler '-c -o' support" contains extra test and t...
Product: Red Hat Linux
Classification: Retired
Component: libtool (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Jens Petersen
Brian Brock
Depends On:
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Reported: 2003-04-29 10:10 EDT by Sysoltsev Slawa
Modified: 2007-04-18 12:53 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2003-04-30 23:44:25 EDT
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Description Sysoltsev Slawa 2003-04-29 10:10:26 EDT
Description of problem:
As a part of macro AM_PROG_LIBTOOL in configure.in test ‘if $compiler 
supports -c -o file. $ac_objext’ is included into configuration scripts. If you have 
confugure.in consists of only line AM_PROG_LIBTOOL
and start aclocal, aclocal.m4 will be created; it will contain such test:

# Check to see if options -o and -c are simultaneously supported by compiler
AC_MSG_CHECKING([if $compiler supports -c -o file.$ac_objext])
AC_CACHE_VAL([lt_cv_compiler_c_o], [
$rm -r conftest 2>/dev/null
mkdir conftest
cd conftest
echo "int some_variable = 0;" > conftest.$ac_ext
mkdir out
# According to Tom Tromey, Ian Lance Taylor reported there are C compilers
# that will create temporary files in the current directory regardless of
# the output directory.  Thus, making CWD read-only will cause this test
# to fail, enabling locking or at least warning the user not to do parallel
# builds.
chmod -w .
CFLAGS="$CFLAGS -o out/conftest2.$ac_objext"
if { (eval echo configure:__oline__: \"$ac_compile\") 1>&5; (eval $ac_compile) 
2>out/conftest.err; } && test -s out/conftest2.$ac_
  # The compiler can only warn and ignore the option if not recognized
  # So say no if there are warnings
  if test -s out/conftest.err; then
  # Append any errors to the config.log.
  cat out/conftest.err 1>&AC_FD_CC

This test tries compiler with ‘–c –o out/coftest.$ac_objext’ option and is passed if:
1. compiler exits successfully
2. output file is created
3. there is nothing in compiler stderr output
This is quite OK, but before calling compiler script denies writing to the current 
directory (as I understand motivation is in comment). So it seems that within ‘-c –
o’ support test there is ANOTHER test for ability of compiler to work without 
creating temporary files in current directory. This test must be separated because 
this feature is NOT needed for general build process, while ‘-c –o’ tests are needed 
and quite usual.
GNU compiler does not use temporary files usually and does not expose the 
problem. That’s why several packages from Linux Distributions (pygtk2 (see 
tracker #89781), netatalk) do not handle the case when ‘-c –o’ test fails. In such 
cases building process becomes broken. 
Intel compiler does support ‘-c –o’ combination, but also uses temporary files, 
creating them in current directory.  These file have unique name and are removed 
after compilation. How can it hurt build process? And what’s the connection of 
temporary files compiler’s behavior with ‘-c –o’ support ??? Nevertheless  ‘-c –o’ 
fails with Intel compiler and build process cannot straighten up. That cause 
package build to fail in libtool that cannot find output file because itself suppress –
o option due to such a misconfiguration!
Configuration itself is very complicated process, scripts should be clear. That’s 
why test for ‘-c –o’ support and test for where temporary files are created must be 
separated. That would only increase Red Hat Linux portability and reliability.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Be in empty directory and have automake installed
2. echo AM_PROG_LIBTOOL > configure.in
3. aclocal.m4 will contain invalid test ‘# Check to see if options -o and -c are 
simultaneously supported by compiler”
In case of real package this test goes to configure script afterwards.
See tracker #89781 if you wish to see real error happened. Also such situation 
happens in netatalk package (and may be in more packages).
Actual results:
‘-c –o’ test may be failed though compiler support ‘-c –o’ combination.
Exactly that happens with latest versions of Intel compiler.

Expected results:
‘-c –o’ test must test only feature it intended test to.

Additional info:
I would try to push Intel compiler to generate temporary file somewhere else or use 
pipes but how could I motivate that temporary files cannot be in current directory? 
It seems quite natural…
Comment 1 Jens Petersen 2003-04-30 23:44:25 EDT
This is an upstream issue, which is still present in Libtool 1.5.

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