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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang ignores -Wno-format-extra-args"
href="https://llvm.org/bugs/show_bug.cgi?id=27159">27159</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang ignores -Wno-format-extra-args
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>royger@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Clang 3.8 seems to ignore -Wno-format-extra-args, here is the result:
cc -isystem /usr/local/include -Wno-ignored-attributes -Qunused-arguments
-Wno-header-guard -Wno-tautological-compare -Wno-format-extra-args -isystem
/usr/local/include -fstack-protector -fno-strict-aliasing -O2
-fomit-frame-pointer -m64 -fno-strict-aliasing -std=gnu99 -Wall
-Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-local-typedefs
-O1 -fno-omit-frame-pointer -m64 -g -fno-strict-aliasing -std=gnu99 -Wall
-Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-local-typedefs
-D__XEN_TOOLS__ -MMD -MF .subdirs-install.d -D_LARGEFILE_SOURCE
-D_LARGEFILE64_SOURCE -fno-optimize-sibling-calls -O1 -fno-omit-frame-pointer
-m64 -g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes
-Wdeclaration-after-statement -Wno-unused-local-typedefs -D__XEN_TOOLS__ -MMD
-MF .subdir-install-libxl.d -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-fno-optimize-sibling-calls -O1 -fno-omit-frame-pointer -m64 -g
-fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes
-Wdeclaration-after-statement -Wno-unused-local-typedefs -D__XEN_TOOLS__ -MMD
-MF .libxl_internal.o.d -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-fno-optimize-sibling-calls -Werror -Wno-format-zero-length
-Wmissing-declarations -Wno-declaration-after-statement -Wformat-nonliteral -I.
-fPIC -pthread
-I/usr/ports/sysutils/xen-tools/work/xen-4.5.2/tools/libxl/../../tools/libxc/include
-I/usr/ports/sysutils/xen-tools/work/xen-4.5.2/tools/libxl/../../tools/include
-I/usr/ports/sysutils/xen-tools/work/xen-4.5.2/tools/libxl/../../tools/libxc/include
-I/usr/ports/sysutils/xen-tools/work/xen-4.5.2/tools/libxl/../../tools/include
-I/usr/ports/sysutils/xen-tools/work/xen-4.5.2/tools/libxl/../../tools/xenstore/include
-I/usr/ports/sysutils/xen-tools/work/xen-4.5.2/tools/libxl/../../tools/include
-Wshadow -include
/usr/ports/sysutils/xen-tools/work/xen-4.5.2/tools/libxl/../../tools/config.h
-c -o libxl_internal.o libxl_internal.c
libxl_internal.c:25:54: error: data argument not used by format string
[-Werror,-Wformat-extra-args]
libxl__log(ctx, XTL_CRITICAL, ENOMEM, 0,0, func, L);
^
libxl_internal.c:24:17: note: expanded from macro 'L'
func, (unsigned long)nmemb, (unsigned long)size
^
libxl_internal.c:26:21: error: data argument not used by format string
[-Werror,-Wformat-extra-args]
fprintf(stderr, L);
^
libxl_internal.c:24:17: note: expanded from macro 'L'
func, (unsigned long)nmemb, (unsigned long)size
^
2 errors generated.
/usr/ports/sysutils/xen-tools/work/xen-4.5.2/tools/libxl/../../tools/Rules.mk:100:
recipe for target 'libxl_internal.o' failed
gmake[5]: *** [libxl_internal.o] Error 1
gmake[5]: *** Waiting for unfinished jobs....
The code in question is:
void libxl__alloc_failed(libxl_ctx *ctx, const char *func,
size_t nmemb, size_t size) {
#define M "libxl: FATAL ERROR: memory allocation failure"
#define L (size ? M " (%s, %lu x %lu)\n" : M " (%s)\n"), \
func, (unsigned long)nmemb, (unsigned long)size
libxl__log(ctx, XTL_CRITICAL, ENOMEM, 0,0, func, L);
fprintf(stderr, L);
fflush(stderr);
_exit(-1);
#undef M
#undef L
}
Which of course has the issues reported by clang, but AFAICT
-Wno-format-extra-args should prevent those warnings from appearing.
Roger.</pre>
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