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Document how to safely override CFLAGS default.

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* doc/autoconf.texi (C Compiler) <AC_PROG_CC>: Document a way to
change the default CFLAGS.
(C++ Compiler) <AC_PROG_CXX>: Likewise, for CXXFLAGS.
Reported by Monty Taylor; wording suggested by Paolo Bonzini.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2010-02-25 14:56:34 -07:00
parent 41ec811b56
commit 534a64aef3
2 changed files with 13 additions and 2 deletions
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6
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@ -1,5 +1,11 @@
2010-02-26 Eric Blake <eblake@redhat.com>
Document how to safely override CFLAGS default.
* doc/autoconf.texi (C Compiler) <AC_PROG_CC>: Document a way to
change the default CFLAGS.
(C++ Compiler) <AC_PROG_CXX>: Likewise, for CXXFLAGS.
Reported by Monty Taylor; wording suggested by Paolo Bonzini.
Document that Autoconf relies on IFS.
* doc/autoconf.texi (Special Shell Variables) <IFS>: Add details
about use of IFS within configure script.

9
doc/autoconf.texi
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@ -7128,7 +7128,9 @@ If using the @acronym{GNU} C compiler, set shell variable @code{GCC} to
@samp{yes}. If output variable @code{CFLAGS} was not already set, set
it to @option{-g -O2} for the @acronym{GNU} C compiler (@option{-O2} on systems
where @acronym{GCC} does not accept @option{-g}), or @option{-g} for
other compilers.
other compilers. If your package does not like this default, then it is
acceptable to insert the line @samp{: $@{CFLAGS=""@}} after @code{AC_INIT}
and before @code{AC_PROG_CC} to select an empty default instead.
Many Autoconf macros use a compiler, and thus call
@samp{AC_REQUIRE([AC_PROG_CC])} to ensure that the compiler has been
@ -7529,7 +7531,10 @@ If using the @acronym{GNU} C++ compiler, set shell variable @code{GXX} to
@samp{yes}. If output variable @code{CXXFLAGS} was not already set, set
it to @option{-g -O2} for the @acronym{GNU} C++ compiler (@option{-O2} on
systems where G++ does not accept @option{-g}), or @option{-g} for other
compilers.
compilers. If your package does not like this default, then it is
acceptable to insert the line @samp{: $@{CXXFLAGS=""@}} after @code{AC_INIT}
and before @code{AC_PROG_CXX} to select an empty default instead.
@end defmac
@defmac AC_PROG_CXXCPP