OK, I have tested this on a Linux RH7 box that has a gcc that does NOT
support -std=c89, and it all works OK, plus I have tested this on a Solaris
2.8 box that does support -std=c89, and it works all OK too. Additionally I
have tested it with --enable-maintainer-mode and without, and all OK.
Basically I added one more m4 script to build/ac-macros, called
check-gcc-opt.m4. This defines one function svn_lib_check_gcc_option(), that
takes one possible CFLAG option and tries to compile an empty main() with
it. If it compiles and runs OK, then the option is considered valid.
Additionally, in configure.in, I call that function to see if std=c89 should
be appended to the CFLAGS parameter.
All fairly simple.
I am new to m4 programming (if it can be called that, kind of like calling
snow-boarding skiing), so I am not aware of how much other 'protection' I
need to wrap this implementation up in.
Leif Eriksen
Developer
HPA - IT Development
+61 3 9217 5545
leif.eriksen@hpa.com.au <mailto:leif.eriksen@hpa.com.au>
<snip>
Log:
Added subversion/build/ac-macros/check-gcc-opt.m4, containing one function
SVN_LIB_CHECK_GCC_OPTION. This checks whether the option is supported by the
GCC compiler on the target platform.
Added call to SVN_LIB_CHECK_GCC_OPTION in subversion/configure.in, to see if
std=c89 should be added to CFLAGS.
Index: subversion-0.24.2/configure.in
===================================================================
--- subversion-0.24.2/configure.in Thu Jun 19 02:35:41 2003
+++ subversion-0.24.2/configure.in.leif Thu Jul 3 13:27:43 2003
@@ -51,6 +51,7 @@
dnl Grab our own macros
sinclude(build/ac-macros/berkeley-db.m4)
+sinclude(build/ac-macros/check-gcc-opt.m4)
sinclude(build/ac-macros/svn-apache.m4)
sinclude(build/ac-macros/svn-macros.m4)
sinclude(build/ac-macros/neon.m4)
@@ -378,6 +379,7 @@
])
AC_SUBST(MOD_ACTIVATION)
+AC_MSG_NOTICE([Setting CFLAGS])
AC_ARG_ENABLE(maintainer-mode,
AC_HELP_STRING([--enable-maintainer-mode],
@@ -391,12 +393,20 @@
if test "$GCC" = "yes"; then
dnl SVN_DEBUG enables specific features for developer builds
dnl AP_DEBUG enables specific (Apache) features for developer
builds
- CFLAGS="$CFLAGS -std=c89 -Wpointer-arith -Wwrite-strings -Wshadow
-DSVN_DEBUG -DAP_DEBUG";
+
+ CFLAGS="$CFLAGS -Wpointer-arith -Wwrite-strings -Wshadow -DSVN_DEBUG
-DAP_DEBUG";
+
+ dnl Check the compiler options
+ SVN_LIB_CHECK_GCC_OPTION(["-std=c89"])
+
+ if test "$svn_lib_check_option" = "yes" ; then
+ CFLAGS="$CFLAGS -std=c89"
+ fi
+ AC_MSG_NOTICE([CFLAGS is $CFLAGS])
fi
fi
])
-
if test "$enable_debugging" = "yes" ; then
dnl At the moment, we don't want optimization, because we're
dnl debugging.
Index: subversion-0.24.2/build/ac-macros/check-gcc-opt.m4
===================================================================
dnl SVN_LIB_CHECK_GCC_OPTION(option)
dnl
dnl Compile a little C program with the passed in option
dnl and see if it was successfully compiled.
AC_DEFUN(SVN_LIB_CHECK_GCC_OPTION,
[
option=$1
svn_lib_check_gcc_option_save_flags="$CFLAGS"
CFLAGS="$CFLAGS $option"
AC_TRY_RUN(
[
#include <stdlib.h>
main ()
{
exit (0);
}
],
[svn_lib_check_option=yes],
[svn_lib_check_option=no],
[svn_lib_check_option=yes]
)
CFLAGS="$svn_lib_check_gcc_option_save_flags"
]
)
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Received on Thu Jul 3 06:50:26 2003