[geany/geany] e3f7d2: Test whether the C++ compiler works by compiling a test program

Colomban Wendling git-noreply at xxxxx
Sat Aug 20 17:57:22 UTC 2016

Branch:      refs/heads/master
Author:      Colomban Wendling <ban at herbesfolles.org>
Committer:   Colomban Wendling <ban at herbesfolles.org>
Date:        Sat, 30 Jul 2016 22:54:56 UTC
Commit:      e3f7d256c32307d211b728582fb688512cddfb24

Log Message:
Test whether the C++ compiler works by compiling a test program

This is more reliable than using `which`, which doesn't work if the CXX
environment variable is set to something else than an executable (e.g
contains options), and is apparently less portable on some systems.

 * http://lists.geany.org/pipermail/devel/2009-September/001367.html,
   which lead to 5bb28825aadb43ea8ba536c34970d53860b50759.
 * https://sourceforge.net/p/geany/bugs/455/, which lead to a revert
   of the above, 5b9605a9d6d799629b8ed3163596069c8c948b06.

Fixes #829.

Modified Paths:

Modified: configure.ac
6 lines changed, 1 insertions(+), 5 deletions(-)
@@ -30,11 +30,7 @@ AC_PROG_CC_C99
-# check for C++ compiler explicitly and fail if none is found, do this check
-# after AC_PROG_CXX has set the CXX environment variable
-if ! which $CXX >/dev/null 2>&1; then
-	AC_MSG_ERROR([No C++ compiler found. Please install a C++ compiler.])

Modified: m4/geany-prog-cxx.m4
20 lines changed, 20 insertions(+), 0 deletions(-)
@@ -0,0 +1,20 @@
+dnl Check for a working C++ compiler.
+dnl like AC_PROG_CXX, but makes sure the compiler actually works instead of
+dnl falling back on a reasonable default only.
+dnl You must call AC_PROG_CXX yourself before this macro.
+	AC_MSG_CHECKING([whether the C++ compiler works])
+			[AC_LANG_PROGRAM([[class Test {public: static int main() {return 0;}};]],
+			                 [[Test::main();]])],
+			[AC_MSG_RESULT([yes])],
+			[AC_MSG_RESULT([no])
+			 AC_MSG_ERROR([The C++ compiler $CXX does not work. Please install a working C++ compiler or define CXX to the appropriate value.])])
+	AC_LANG_POP([C++])

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