diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/jm-glibc-io.m4n | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/m4/jm-glibc-io.m4n b/m4/jm-glibc-io.m4n new file mode 100644 index 000000000..5974107ed --- /dev/null +++ b/m4/jm-glibc-io.m4n @@ -0,0 +1,33 @@ +#serial 5 -*- autoconf -*- + +dnl From Jim Meyering. +dnl +dnl See if the glibc *_unlocked I/O macros are available. +dnl Use only those *_unlocked macros that are declared. +dnl + +AC_DEFUN(jm_FUNC_GLIBC_UNLOCKED_IO, + [ + # Kludge (not executed) to make autoheader do the right thing. + if test a = b; then + AC_CHECK_DECLS([@comma_separated@]) + AC_CHECK_FUNCS(@space_separated@) + fi + + io_functions='@space_separated@' + + for jm_io_func in $io_functions; do + # Check for the existence of each function only if it is declared. + # Otherwise, we'd get the Solaris5.5.1 functions that are not + # declared, and that have been removed from Solaris5.6. The resulting + # 5.5.1 binaries would not run on 5.6 due to shared library differences. + AC_CHECK_DECLS([$jm_io_func], + jm_declared=yes, + jm_declared=no, + [#include <stdio.h>]) + if test $jm_declared = yes; then + AC_CHECK_FUNCS($jm_io_func) + fi + done + ] +) |