Mercurial > hg > octave-lojdl > gnulib-hg
comparison doc/posix-functions/alarm.texi @ 17366:9855b352e525
regex: port to mingw's recent addition of undeclared alarm
On mingw (at least, when cross-compiling with Fedora 18's
mingw32-headers-2.0.999-0.15.trunk.20121110.fc18.noarch build),
compilation of test-regex fails:
test-regex.c: In function 'main':
test-regex.c:42:11: error: 'SIGALRM' undeclared (first use in this function)
test-regex.c:42:11: note: each undeclared identifier is reported only
once for each function it appears in
test-regex.c:43:3: warning: implicit declaration of function 'alarm'
It turns out that recent mingw64 added an export of alarm() and
SIGALRM, but guarded their declarations behind __USE_MINGW_ALARM
(default off, and with alarm() only in the non-standard <io.h>);
so the m4 tests were setting HAVE_ALARM to 1 based on link success
but then failing to compile.
* doc/posix-functions/alarm.texi (alarm): Document that alarm
exists but still doesn't work in newer mingw.
* m4/frexp.m4 (gl_FUNC_FREXP_WORKS): Check for alarm declaration,
not existence. Ensure SIGALRM is not trapped.
* m4/mktime.m4 (gl_FUNC_MKTIME): Likewise.
* m4/regex.m4 (gl_REGEX): Likewise.
* m4/remainderf.m4 (gl_FUNC_REMAINDERF_WORKS): Likewise.
* tests/test-regex.c (main): Use correct probe for alarm.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
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date | Mon, 11 Mar 2013 14:51:33 -0600 |
parents | 6355dc4626b5 |
children |
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17365:a154fccd3b21 | 17366:9855b352e525 |
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11 @end itemize | 11 @end itemize |
12 | 12 |
13 Portability problems not fixed by Gnulib: | 13 Portability problems not fixed by Gnulib: |
14 @itemize | 14 @itemize |
15 @item | 15 @item |
16 This function has no impact if <code>SIGALRM</code> is inherited as | |
17 ignored; programs should use <code>signal (SIGALRM, SIG_DFL)</code> if | |
18 it is important to ensure the alarm will fire. | |
19 @item | |
20 Use of this function in multi-threaded applications is not advised. | |
21 @item | |
16 This function is missing on some platforms: | 22 This function is missing on some platforms: |
17 mingw, MSVC 9. | 23 mingw (2011), MSVC 9. |
24 @item | |
25 This function is conditionally declared in the non-standard | |
26 @code{<io.h>} header on some platforms: | |
27 mingw (2012 or newer). | |
18 @end itemize | 28 @end itemize |