Re: Specifying Flag Order?

[Jordan H.]

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Yes, I'll try that. Thank you.
I'm still trying to get a hang of what all the macros and variables
mean...I understand the basic syntax, at least.
While we're on the topic, any resources out there to help someone get a
handle on vars/macros? I see in the automake manual an entire index but
it doesn't seem to be beginner-friendly.
Thanks.

Luke Mewburn:
> On Wed, May 22, 2013 at 04:46:36PM -0700, Jordan H. wrote:
>   | I'm using mysql in a program. Here is a snipped of my Makefile.am:
>   |
>   |     project_LDADD += -lboost_thread
>   |     project_LDADD += -lboost_regex
>   |     project_LDADD += -lboost_system
>   |
>   |     AM_LDFLAGS = -L/usr/local/lib
>   |     AM_LDFLAGS += `mysql_config --libs_r`
>   |     AM_LDFLAGS += `mysql_config --include`
>   |     AM_LDFLAGS += -std=c++0x
>   |     AM_LDFLAGS += `mysql_config --cflags`
>   |
>   | When I compile the program, automake generated:
>   |
>   |     g++  -g -O2 -L/usr/local/lib `mysql_config --libs_r` `mysql_config
>   | --include` -std=c++0x
>   |     `mysql_config --cflags`  -o /[ ... a bunch of .o files ... ]/
>   | -lboost_thread -lboost_regex
>   |     -lboost_system
>   |
>   | As expected, since g++ needs linker flags at the end I get a bunch of
>   | compile errors saying the `mysql_*` functions don't exist. How do I
>   | specify for the linker flags to go at the end? I tried to put them in
>   | the project_LDADD macro but automake complained:
>   |
>   |     Makefile.am:13: linker flags such as `--libs_r`' belong in
>   | `project_LDFLAGS
>   |
>   | Which got me back to square one. I must be doing something wrong. Any
>   | ideas? This has been bugging me for days. Thanks in advance.
>
> Hi Jordan,
>
> I define some automake substition variables in configure.ac as part
> of the checks for MySQL:
>
>     # Look for mysql via the presence of 'mysql_config' or 'mysql_config5'
>     #
>     AC_PATH_PROGS([TOOL_MYSQL_CONFIG], [mysql_config mysql_config5], [],
>               [$PATH:/opt/local/bin])
>     AS_IF([test -n "$TOOL_MYSQL_CONFIG"],
>           [MYSQL_CFLAGS=`$TOOL_MYSQL_CONFIG --cflags`
>            MYSQL_LIBS=`$TOOL_MYSQL_CONFIG --libs_r`
>            MYSQL_VERSION=`$TOOL_MYSQL_CONFIG --version`],
>           [AC_MSG_ERROR([missing program 'mysql_config'; is 'mysql' or
'MySQL-devel' installed?])])
>
>     WANT_MYSQL_VERSION=5.1.55
>
>     AC_MSG_CHECKING([for mysql >= $WANT_MYSQL_VERSION])
>     AS_VERSION_COMPARE([$MYSQL_VERSION], [$WANT_MYSQL_VERSION],
>          [AC_MSG_RESULT([no])
>           AC_MSG_FAILURE([mysql $MYSQL_VERSION is too old, need
$WANT_MYSQL_VERSION])])
>     AC_MSG_RESULT([yes])
>
>     AC_SUBST([MYSQL_CFLAGS])
>     AC_SUBST([MYSQL_LIBS])
>     AC_PATH_PROGS([TOOL_MYSQL], [mysql mysql5], [],
>               [$PATH:/opt/local/bin])
>     AS_IF([test -n "$TOOL_MYSQL"],
>           [:],
>           [AC_MSG_ERROR([missing program 'mysql'; is 'mysql' or
'MySQL-client-community' installed?])])
>
>
> I then use these in the Makefile.am as:
>
>     prog_CPPFLAGS += $(MYSQL_CFLAGS)
>     prog_LDADD += $(MYSQL_LIBS)
>
> (As an aside, you probably don't want includes and cflags in LDFLAGS)
>
> I don't bother with `mysql_config --include`
>
>
> Feel free to reuse those snippets as you like.
>
>
> I hope that's useful.
>
>
> Regards,
> Luke.

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