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build: improve AX_LUA_HEADERS for crosscompile 

The preprocessor is something configure can invoke.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2021-04-21 12:17:55 +02:00
parent 8b11dfcaec
commit 6fc9987217
1 changed files with 15 additions and 38 deletions
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53
m4/ax_lua.m4
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@ -514,47 +514,24 @@ AC_DEFUN([AX_LUA_HEADERS],
])
AS_IF([test "x$ac_cv_header_lua_h" = 'xyes'],
[ dnl Make a program to print LUA_VERSION defined in the header.
dnl TODO It would be really nice if we could do this without compiling a
dnl program, then it would work when cross compiling. But I'm not sure how
dnl to do this reliably. For now, assume versions match when cross compiling.
AS_IF([test "x$cross_compiling" != 'xyes'],
[ AC_CACHE_CHECK([for Lua header version],
[ax_cv_lua_header_version],
[ _ax_lua_saved_cppflags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $LUA_INCLUDE"
AC_RUN_IFELSE(
[ AC_LANG_SOURCE([[
#include <lua.h>
#include <stdlib.h>
#include <stdio.h>
int main(int argc, char ** argv)
{
if(argc > 1) printf("%s", LUA_VERSION);
exit(EXIT_SUCCESS);
}
]])
],
[ ax_cv_lua_header_version=`./conftest$EXEEXT p | \
[ AC_CACHE_CHECK([for Lua header version],
[ax_cv_lua_header_version],
[
ax_cv_lua_header_version=`echo LUA_VERSION | \
$CC -P -E $LUA_INCLUDE -imacros lua.h - | \
$SED -e 's%"\s*"%%g' -e 's%^\s*%%' | \
tr -d '"\n' | \
$SED -n "s|^Lua \(@<:@0-9@:>@\{1,\}\.@<:@0-9@:>@\{1,\}\).\{0,\}|\1|p"`
],
[ax_cv_lua_header_version='unknown'])
CPPFLAGS=$_ax_lua_saved_cppflags
])
])
dnl Compare this to the previously found LUA_VERSION.
AC_MSG_CHECKING([if Lua header version matches $LUA_VERSION])
AS_IF([test "x$ax_cv_lua_header_version" = "x$LUA_VERSION"],
[ AC_MSG_RESULT([yes])
ax_header_version_match='yes'
],
[ AC_MSG_RESULT([no])
ax_header_version_match='no'
])
],
[ AC_MSG_WARN([cross compiling so assuming header version number matches])
dnl Compare this to the previously found LUA_VERSION.
AC_MSG_CHECKING([if Lua header version matches $LUA_VERSION])
AS_IF([test "x$ax_cv_lua_header_version" = "x$LUA_VERSION"],
[ AC_MSG_RESULT([yes])
ax_header_version_match='yes'
],
[ AC_MSG_RESULT([no])
ax_header_version_match='no'
])
])