sigrok.m4: Add SR_PROG_VERSION macro

diff --git a/m4/sigrok.m4 b/m4/sigrok.m4
index 539c3849597be8c305e96a445c7dbbd52ad4d8ab..e35f9fd1884227d9563a35b2fb68ab295fb1bd1a 100644 (file)
--- a/m4/sigrok.m4
+++ b/m4/sigrok.m4
@@ -319,6 +319,19 @@ _SR_ARG_OPT_PKG(m4_defn([_SR_VAR_OPT_PKG_FEATURES]),
        m4_shift3($@))[]dnl
 ])
 
+## SR_PROG_VERSION(program, sh-var)
+##
+## Obtain the version of <program> and store it in <sh-var>.
+##
+AC_DEFUN([SR_PROG_VERSION],
+[dnl
+m4_assert([$# >= 2])[]dnl
+sr_prog_ver=`$1 --version 2>&AS_MESSAGE_LOG_FD | sed 1q 2>&AS_MESSAGE_LOG_FD`
+AS_CASE([[$]?:$sr_prog_ver],
+       [[0:*[0-9].[0-9]*]], [$2=$sr_prog_ver],
+       [$2=unknown])[]dnl
+])
+
 ## SR_PROG_MAKE_NO_PRINT_DIRECTORY
 ##
 ## Check whether the make program supports the --no-print-directory flag.