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Date: Tue, 16 Apr 2002 22:11:24 +0100
From: Laurynas Biveinis <lauras AT softhome DOT net>
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Message-ID: <172511444808.20020416221124@softhome.net>
To: djgpp-workers AT delorie DOT com
Subject: DJGPP-specific (?) bug in Autoconf 2.50
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X-OriginalArrivalTime: 15 Apr 2002 20:08:06.0299 (UTC) FILETIME=[418DF6B0:01C1E4B9]
Reply-To: djgpp-workers AT delorie DOT com

Hello,

Suppose you have C but not C++ compiler installed. Now following
configure.ac:
---
AC_INIT(blabla, 0.1)

AC_PROG_CC
AC_PROG_CXX

AC_OUTPUT
---
will produce following output:
---
[...]
checking for gcc... gcc
checking for C compiler default output... a.exe
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for executable suffix... .exe
checking for object suffix... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for g++... no
[...]
checking for xlC... no
checking whether we are using the GNU C++ compiler... no
checking whether g++ accepts -g... no
configure: creating ./config.status
---
Huh? It thinks that C++ compiler is available. I think AC_EXEEXT
(or how it is called in 2.50?), or brain damage in AC_PROG_CXX
is guilty: AC_PROG_CXX has only one way to check if C++ really
works: AC_EXEEXT. However, if there is AC_PROG_CC before
AC_PROG_CXX, it will call AC_EXEEXT first, and AC_PROG_CXX would do
nothing in this case. Drat. I would take up this with Autoconf
maintainers, but for that I would have to use latest autoconf version,
which is not available for DJGPP. Any suggestions or am I missing
something?

Laurynas