diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 9150008..95d795c 100644 --- a/configure.ac +++ b/configure.ac @@ -54,9 +54,22 @@ m4_define([serial_tests], [ awk '{split ($NF,a,"."); if (a[1] == 1 && a[2] >= 12) { print "serial-tests" }}' ]) ]) + +dnl Automake 1.14+ warns if sources are in sub-directories but subdir-objects +dnl options is not enabled. However, automake before 1.15a has a bug that causes +dnl variable expansion to fail in foo_SOURCES when this option is used. +dnl As most of our build systems are now likely to use automake 1.16+ add a +dnl work around to conditionally add subdir-objects option. +m4_define([subdir_objects], [ + m4_esyscmd([automake --version | + head -1 | + awk '{split ($NF,a,"."); if (a[1] == 1 && a[2] >= 16) { print "subdir-objects" }}' + ]) +]) + # This foreign option prevents autoreconf from overriding our COPYING and # INSTALL targets: -AM_INIT_AUTOMAKE(foreign serial_tests 1.9) dnl NB: Do not [quote] this parameter. +AM_INIT_AUTOMAKE(foreign serial_tests subdir_objects 1.9) dnl NB: Do not [quote] this parameter. AC_CANONICAL_HOST AC_USE_SYSTEM_EXTENSIONS |