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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - configure script errors in llvm-3.3 and current trunk cause --enable-optimize to not be used and instead continue to use CFLAGS set by build environment"
href="http://llvm.org/bugs/show_bug.cgi?id=16724">16724</a>
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<th>Summary</th>
<td>configure script errors in llvm-3.3 and current trunk cause --enable-optimize to not be used and instead continue to use CFLAGS set by build environment
</td>
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<th>Product</th>
<td>Build scripts
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>autoconf
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jeremyhu@apple.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Found downstream: <a href="https://trac.macports.org/ticket/39761">https://trac.macports.org/ticket/39761</a>
If you set CFLAGS="-O2 -pipe" when configuring llvm, you'll see something like:
./configure: line 1990: -O2: command not found
./configure: line 1991: -O2: command not found
And -O2 will be preferred over the value passed to --enable-optimize
Those lines of the configure script are just:
${CFLAGS=}
${CXXFLAGS=}
which come from this in configure.ac:
dnl Default to empty (i.e. assigning the null string to) CFLAGS and CXXFLAGS,
dnl instead of the autoconf default (for example, '-g -O2' for CC=gcc).
${CFLAGS=}
${CXXFLAGS=}
which was a bug introduced by this commit:
commit 6c440fcea52e27b3befcf2ad5f7dcc58a15a2e58
Author: Patrik Hagglund <<a href="mailto:patrik.h.hagglund@ericsson.com">patrik.h.hagglund@ericsson.com</a>>
Date: Mon Feb 4 08:15:53 2013 +0000
Pass CPPFLAGS/CFLAGS/CXXFLAGS from the environment of configure to
Makefile.config.
This is implied at the bottom of the help text of configure (besides
CC/CXX/LDFLAGS, already passed to Makefile.config).
For backward compatibility, the values of CFLAGS and CXXFLAGS defaults
to empty, overriding the default values provided by autoconf (for
example, '-g -O2' when CC=gcc').
$(CPP) is not used by our makefiles. Therefore, the value of CPP is
not passed to Makefile.config, despite beeing mentioned by 'configure
--help'.
git-svn-id: <a href="https://llvm.org/svn/llvm-project/llvm/trunk@174313">https://llvm.org/svn/llvm-project/llvm/trunk@174313</a>
91177308-0d34-0410-b5e6-96231b3b80d8</pre>
</div>
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