Fix a problem with locks when building GNU Tar (Savannah commit 55f2a0772e08b9febac3ac0de5cb048d4c60d2f5) on AIX 7.1 with IBM XL C/C++ V12.1 using ‘./configure CC=xlc’. The link fails due to missing definitions of pthread_mutex_lock and pthread_mutex_unlock. GNU Tar uses unlocked-io and so should not need to worry about multithreading or locks. * lib/mbtowc-lock.h (mbtowc_with_lock) [USE_UNLOCKED_IO]: Don’t bother with locks, since this app is single-threaded. There may be similar linking problems with lib/nl_langinfo.c and lib/setlocale_null.c but my GNU Tar build didn’t run into them, so I left them alone for now. --- ChangeLog | 15 +++++++++++++++ lib/mbtowc-lock.h | 10 +++++++++- 2 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog index 0304f6958..7ba436925 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,18 @@ +2021-03-02 Paul Eggert <egg...@cs.ucla.edu> + + mbrtowc: port to AIX 7.1 with xlc 12.1 + Fix a problem with locks when building GNU Tar (Savannah commit + 55f2a0772e08b9febac3ac0de5cb048d4c60d2f5) on AIX 7.1 with IBM XL + C/C++ V12.1 using ‘./configure CC=xlc’. The link fails due to + missing definitions of pthread_mutex_lock and + pthread_mutex_unlock. GNU Tar uses unlocked-io and so + should not need to worry about multithreading or locks. + * lib/mbtowc-lock.h (mbtowc_with_lock) [USE_UNLOCKED_IO]: + Don’t bother with locks, since this app is single-threaded. + There may be similar linking problems with lib/nl_langinfo.c and + lib/setlocale_null.c but my GNU Tar build didn’t run into them, so + I left them alone for now. + 2021-03-01 Paul Eggert <egg...@cs.ucla.edu> unlocked-io: do not redefine getc_unlocked etc. diff --git a/lib/mbtowc-lock.h b/lib/mbtowc-lock.h index 696b12c58..b7c5ba8a0 100644 --- a/lib/mbtowc-lock.h +++ b/lib/mbtowc-lock.h @@ -32,7 +32,15 @@ mbtowc_unlocked (wchar_t *pwc, const char *p, size_t m) /* Prohibit renaming this symbol. */ #undef gl_get_mbtowc_lock -#if defined _WIN32 && !defined __CYGWIN__ +#ifdef USE_UNLOCKED_IO + +static int +mbtowc_with_lock (wchar_t *pwc, const char *p, size_t m) +{ + return mbtowc_unlocked (pwc, p, m); +} + +#elif defined _WIN32 && !defined __CYGWIN__ extern __declspec(dllimport) CRITICAL_SECTION *gl_get_mbtowc_lock (void); -- 2.29.2