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view m4/ld-output-def.m4 @ 12454:f7624052e60d
fcntl: support F_DUPFD_CLOEXEC on systems with fcntl
Implement F_DUPFD_CLOEXEC. The unit test still fails on systems
with other fcntl bugs (such as cygwin 1.5 mishandling F_DUPFD,
or mingw lacking fcntl altogether). Passes on Linux, both with
and without kernel support, and on cygwin 1.7.
* modules/fcntl (Files): List new files.
(configure.ac): Run a test.
* m4/fcntl.m4 (gl_FUNC_FCNTL): New file.
* lib/fcntl.c (rpl_fcntl): Likewise.
* m4/fcntl_h.m4 (gl_FCNTL_H_DEFAULTS): Add witness defaults.
(gl_FCNTL_H): Always replace fcntl.h.
* modules/fcntl-h (Makefile.am): Substitute witnesses.
* lib/fcntl.in.h (fcntl): Declare replacement.
(F_DUPFD_CLOEXEC, GNULIB_defined_F_DUPFD_CLOEXEC): New macro when
needed, plus a witness.
* doc/posix-functions/fcntl.texi (fcntl): Document this.
* doc/posix-headers/fcntl.texi (fcntl.h): Likewise.
* tests/test-fcntl.c: New file.
* modules/fcntl-tests: Likewise.
Signed-off-by: Eric Blake <ebb9@byu.net>
| author | Eric Blake <ebb9@byu.net> |
|---|---|
| date | Mon, 07 Dec 2009 11:50:59 -0700 |
| parents | e89e1991ce01 |
| children | c2cbabec01dd |
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# ld-output-def.m4 serial 2 dnl Copyright (C) 2008, 2009 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl From Simon Josefsson # gl_LD_OUTPUT_DEF() # ------------- # Check if linker supports -Wl,--output-def and define automake # conditional HAVE_LD_OUTPUT_DEF if it is. AC_DEFUN([gl_LD_OUTPUT_DEF], [ AC_CACHE_CHECK([if gcc/ld supports -Wl,--output-def], [gl_cv_ld_output_def], [if test "$enable_shared" = no; then gl_cv_ld_output_def="not needed, shared libraries are disabled" else gl_ldflags_save=$LDFLAGS LDFLAGS="-Wl,--output-def,conftest.def" AC_LINK_IFELSE([AC_LANG_PROGRAM([])], [gl_cv_ld_output_def=yes], [gl_cv_ld_output_def=no]) rm -f conftest.def LDFLAGS="$gl_ldflags_save" fi]) AM_CONDITIONAL([HAVE_LD_OUTPUT_DEF], test "x$gl_cv_ld_output_def" = "xyes") ])