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configure: Created new macro to perform the repetitive part of Library check

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There are a number of steps in the library check procedure that are a bit
repetitive, and have been placed into the macro WM_LIB_CHECK to make the
code simpler to write.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
This commit is contained in:
Christophe CURIS
2013-11-17 18:51:13 +01:00
committed by Carlos R. Mafra
parent da597a4b87
commit 64a95b73c3
2 changed files with 96 additions and 109 deletions
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61
m4/windowmaker.m4
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@@ -121,3 +121,64 @@ for wm_arg in $1 ; do
done
AS_VAR_POPDEF([VAR])dnl
])
# WM_LIB_CHECK
# ------------
#
# Check if a library exists (can be linked to) and check if its header can
# compile (using code in parameter to the macro), then update the appropriate
# stuff accordingly
#
# Usage: WM_LIB_CHECK([name], [lflaglist], [lfunc], [extralibs], [headercheck], [supvar], [libvar], [enable_var], [cond_name])
# $1 name: name of the feature used in messages and in supvar
# $2 lflaglist: the list of linker '-l' options to try, stopping on first success
# $3 lfunc: the name of the function to look for when linking
# $4 extralibs: optional, additional libraries included in the link check
# $5 headercheck: the code that checks for the header
# $6 supvar: if the library was found, append $name to this variable,
# otherwise append $name to 'unsupported'
# $7 libvar: if the library was found, append the working $lflag to this variable
# $8 enable_var: variable to check for user's feature request, if empty we use "lowercase(enable_$1)"
# $9 cond_name: name of the AC_DEFINE and the AM_CONDITIONAL
# if empty, use "uppercase(USE_$1)", if equals "-" same but do not create AM_CONDITIONAL
AC_DEFUN([WM_LIB_CHECK],
[AC_REQUIRE([_WM_LIB_CHECK_FUNCTS])
m4_pushdef([ENABLEVAR], [m4_ifnblank([$8], [$8], enable_[]m4_tolower($1))])dnl
m4_pushdef([CACHEVAR], [wm_cv_libchk_[]m4_tolower($1)])dnl
m4_pushdef([USEVAR], [m4_bmatch([$9], [^-?$], [USE_[]m4_toupper($1)], [$9])])dnl
AS_IF([test "x$ENABLEVAR" = "xno"],
[unsupported="$unsupported $1"],
[AC_CACHE_CHECK([for $1 support library], CACHEVAR,
[CACHEVAR=no
wm_save_LIBS="$LIBS"
dnl
dnl We check that the library is available
m4_bmatch([$2], [ ], dnl Any space in 'lflaglist' means we have a list of flags
[for wm_arg in $2 ; do
AS_IF([wm_fn_lib_try_link "$3" "$4 $wm_arg"],
[CACHEVAR="$wm_arg" ; break])
done],
[AS_IF([wm_fn_lib_try_link "$3" "$4 $2"],
[CACHEVAR="$2"]) ])
LIBS="$wm_save_LIBS"
AS_IF([test "x$ENABLEVAR$CACHEVAR" = "xyesno"],
[AC_MSG_ERROR([explicit $1 support requested but no library found])])
dnl
dnl A library was found, check if header is available and compile
AS_IF([test "x$CACHEVAR" != "xno"], [$5])
])
AS_IF([test "x$CACHEVAR" = "xno"],
[unsupported="$unsupported $1"
ENABLEVAR="no"],
[$6="$$6 $1"
WM_APPEND_ONCE([$CACHEVAR], [$7])
AC_DEFINE(USEVAR, [1],
[defined when valid $1 library with header was found])])
])
m4_bmatch([$9], [^-$], [],
[AM_CONDITIONAL(USEVAR, [test "x$ENABLEVAR" != "xno"])])dnl
m4_popdef([ENABLEVAR])dnl
m4_popdef([CACHEVAR])dnl
m4_popdef([USEVAR])dnl
])