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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Macro information is missing for module"
href="http://bugs.llvm.org/show_bug.cgi?id=32693">32693</a>
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<th>Summary</th>
<td>Macro information is missing for module
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Modules
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bruno.cardoso@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
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<pre>Created <span class=""><a href="attachment.cgi?id=18299" name="attach_18299" title="Testcase">attachment 18299</a> <a href="attachment.cgi?id=18299&action=edit" title="Testcase">[details]</a></span>
Testcase
Take this example:
$ cat standalone.c
#import "C.h"
#import "A.h"
void foo __P(());
$ cat Inputs/module.map
module X {
header "A.h"
export *
}
// Y imports X, it also uses “__P” as a parameter name
module Y {
header "B.h"
export *
}
// Z imports X and Y
module Z {
header "C.h”
}
$ cat Inputs/A.h
#define __P(protos) ()
$ cat Inputs/B.h
#import "A.h"
#import "B2.h”
$ cat Inputs/B2.h
void test(int __P) {
}
$ cat Inputs/C.h
#import "A.h"
#import “B.h”
----
This has the interesting behavior of (a) failing on the 1st run and (b) working
when re-using the cache on a 2nd run:
$ rm -rf tmp3; clang -cc1 -fimplicit-module-maps -x objective-c -fmodules
-fmodules-cache-path=tmp3 -emit-obj standalone.c -I Inputs/
standalone.c:4:6: error: variable has incomplete type 'void'
void foo __P(());
^
standalone.c:4:9: error: expected ';' after top level declarator
void foo __P(());
^
;
2 errors generated.
$ clang -cc1 -fimplicit-module-maps -x objective-c -fmodules
-fmodules-cache-path=tmp3 -emit-obj standalone.c -I Inputs
...no_errors...
----
This regressed after Richard's r259901, which probably exposed a bug? Some
notes:
- After r259901 the compiler writes out identifier "__P" without the macro
information for module Y, which seems to be incorrect.
- 2nd run works because Global Index only considers interesting identifiers, so
it skips module Y when calling ModuleManager::visit
Any suggestion on how to fix the issue?</pre>
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