From: Uwe Hermann <redacted>
Date: Fri, 14 Nov 2014 23:41:10 +0000 (+0100)
Subject: autogen.sh: Also warn if AX_CXX_COMPILE_STDCXX_11 is not available.
X-Git-Tag: libsigrok-0.4.0~768
X-Git-Url: http://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=baa0c2ae677940345d2ec62b0b6fdf17e7d2d09d

autogen.sh: Also warn if AX_CXX_COMPILE_STDCXX_11 is not available.

This fixes an error message when the file is not installed at all:

  ./autogen.sh: 67: [: Illegal number:

Turn the AX_CXX_COMPILE_STDCXX_11 errors into warnings though, since
it is (and should be) possible to build libsigrok (just the C library)
just fine, even without that macro or with an older version of it.
---

diff --git a/autogen.sh b/autogen.sh
index 79cec4c2..8685c3c8 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -55,15 +55,19 @@ echo "Generating build system..."
 ${LIBTOOLIZE} --install --copy --quiet || exit 1
 aclocal ${ACLOCAL_DIR} || exit 1
 
-# check the version of a specific autoconf macro that tends to cause problems
+# Check the version of a specific autoconf macro that tends to cause problems.
 CXXMACROVERSION=$(
 	grep -B 5 'm4_define(\[_AX_CXX_COMPILE_STDCXX_11_testbody\]' aclocal.m4 |
 	sed -nr 's/.*serial[[:space:]]+([[:digit:]]+).*/\1/p'
 )
-if [ "$CXXMACROVERSION" -lt 4 ]; then
-	echo "error: the AX_CXX_COMPILE_STDCXX_11 macro on this system is too old."
-	echo "(found version $CXXMACROVERSION, at least 4 is required)"
-	exit 1
+if [ "x$CXXMACROVERSION" = "x" ]; then
+	echo "--- Warning: AX_CXX_COMPILE_STDCXX_11 macro not found."
+	echo "--- You won't be able to build the language bindings!"
+fi
+if [ "x$CXXMACROVERSION" != "x" ] && [ "$CXXMACROVERSION" -lt 4 ]; then
+	echo "--- Warning: AX_CXX_COMPILE_STDCXX_11 macro is too old."
+	echo "--- (found version $CXXMACROVERSION, at least 4 is required)"
+	echo "--- You won't be able to build the language bindings!"
 fi
 
 autoheader || exit 1