From 4b8edd2b6feeec366784e3270ae50853c520c5ea Mon Sep 17 00:00:00 2001
From: Michael Davidsaver <mdavidsaver@gmail.com>
Date: Thu, 12 May 2022 09:38:23 -0700
Subject: [PATCH] automatic COMMANDLINE_LIBRARY w/ newer compilers

---
 configure/CONFIG_COMMON |  1 -
 configure/toolchain.c   | 12 ++++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/configure/CONFIG_COMMON b/configure/CONFIG_COMMON
index 78abdb1b8..d245147d5 100644
--- a/configure/CONFIG_COMMON
+++ b/configure/CONFIG_COMMON
@@ -288,7 +288,6 @@ TARGET_LIB_LDFLAGS = $(if $(findstring $*, $(LOADABLE_LIBRARY)), \
 
 #--------------------------------------------------
 # Command-line input support default
-COMMANDLINE_LIBRARY = EPICS
 OP_SYS_LDLIBS += $(LDLIBS_$(COMMANDLINE_LIBRARY))
 OP_SYS_LDFLAGS += $(LDFLAGS_$(COMMANDLINE_LIBRARY))
 RUNTIME_LDFLAGS += $(RUNTIME_LDFLAGS_$(COMMANDLINE_LIBRARY))
diff --git a/configure/toolchain.c b/configure/toolchain.c
index a97085ae3..2f76b475b 100644
--- a/configure/toolchain.c
+++ b/configure/toolchain.c
@@ -35,3 +35,15 @@ OS_API = posix
 OS_API = score
 #  endif
 #endif
+
+#ifdef __has_include
+#  if defined(__rtems__) && __RTEMS_MAJOR__<5 && __has_include(<libtecla.h>)
+COMMANDLINE_LIBRARY ?= LIBTECLA
+#  elif __has_include(<readline/readline.h>)
+COMMANDLINE_LIBRARY ?= READLINE
+#  else
+COMMANDLINE_LIBRARY ?= EPICS
+#  endif
+#else
+COMMANDLINE_LIBRARY ?= EPICS
+#endif