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Re: AC_TRY_LINK command line problem

From: Yevgen Muntyan
Subject: Re: AC_TRY_LINK command line problem
Date: Thu, 11 Jan 2007 21:17:10 -0600
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.13) Gecko/20060809 Debian/1.7.13-0.3

Ralf Wildenhues wrote:

Hello Yevgen,

* Yevgen Muntyan wrote on Wed, Jan 10, 2007 at 06:17:09AM CET:
AC_TRY_LINK puts LDFLAGS before conftest.c on compilation
command line, and it fails with mingw. Here, it made the following:

/usr/bin/i586-mingw32msvc-gcc -o conftest.exe -O2 -I/usr/local/win/gtk/include -mms-bitfields -march=i686 -I/usr/local/win/gtk/include -I/usr/local/win/Python24/include -L/usr/local/win/gtk/lib -L/usr/local/win/Python24/libs -lpython24 conftest.c

It produces linker errors, undefined reference to whatever is in libpython24.
AC_COMPILE_IFELSE does work fine.

Post the errors, otherwise there's little we can do to help you.
Apparently same thing happens with -Wl,--as-needed option.
If you put it into LDFLAGS, then AC_CHECK_FUNCS fails.
For instance for

AC_CHECK_FUNCS([FAMMonitorDirectory FAMOpen],[fam_found=yes],[fam_found=no])

it produces this command line:

gcc -o conftest -g   -L/usr/local/gtk/lib -Wl,--as-needed -lfam conftest.c

which fails with "undefined reference to `FAMOpen'", but this works:

gcc -o conftest -g conftest.c -L/usr/local/gtk/lib -Wl,--as-needed -lfam

Best regards,

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