Timur Davydov has uploaded this change for review.

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build: add WebSDR configure option and Emscripten detection

Detect Emscripten toolchain and introduce --with-websdr
configure option

When enabled, check for libosmo-trx-websdr and required
symbol modulateBits, failing configure if missing

Change-Id: Iff4b76e339e2873686c8c15885dd498458ceb546
---
M configure.ac
1 file changed, 37 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/00/42700/1

diff --git a/configure.ac b/configure.ac
index 8f8e0d9..a3c22c6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,6 +24,18 @@
 AC_PROG_INSTALL
 LT_INIT
 
+dnl Detect emscripten compiler
+case "$CC" in
+*emcc*)
+	emscripten=yes
+	;;
+*)
+	emscripten=no
+	;;
+esac
+AM_CONDITIONAL(HAVE_EMSCRIPTEN, test "x$emscripten" = "xyes")
+AC_SUBST([HAVE_EMSCRIPTEN], [$emscripten])
+
 dnl patching ${archive_cmds} to affect generation of file "libtool" to fix linking with clang
 AS_CASE(["$LD"],[*clang*],
   [AS_CASE(["${host_os}"],
@@ -321,6 +333,31 @@
 AM_CONDITIONAL(ENABLE_ORTP, test "x$ENABLE_ORTP" = "xyes")
 AC_SUBST(ENABLE_ORTP)
 
+AC_ARG_WITH(websdr, [
+    AS_HELP_STRING([--with-websdr],
+        [enable WebUSB based transceiver])
+])
+
+AM_CONDITIONAL(ENABLE_WEBSDR, [test "x$with_websdr" = "xyes"])
+
+if test "x$with_websdr" = "xyes"; then
+	AC_DEFINE(ENABLE_WEBSDR, 1, Define to 1 for enable WebUSB based transceiver)
+
+	PKG_CHECK_MODULES(LIBOSMOTRX, libosmo-trx-websdr >= 1.7.2)
+
+	# Check whether libosmo-trx-websdr provides modulateBits
+	save_LIBS="$LIBS"
+	LIBS="$LIBS $LIBOSMOTRX_LIBS"
+	AC_CHECK_FUNCS([modulateBits])
+
+	# modulateBits is required — fail configuration if it's missing
+	if test "x$ac_cv_func_modulateBits" != "xyes"; then
+		AC_MSG_ERROR([libosmo-trx-websdr does not provide the required function 'modulateBits'. Please rebuild osmo-trx with both --with-burst-lut and --with-websdr enabled.])
+	fi
+
+	LIBS="$save_LIBS"
+fi
+
 AC_CHECK_HEADER([linux/if_packet.h], [linux_if_packet_header="yes"], [])
 if test "x$linux_if_packet_header" = "xyes" ; then
 	AC_DEFINE(HAVE_LINUX_IF_PACKET_H, 1, [Define if we found linux/if_packet.h])

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