On Wed, 28 Mar 2012, Måns Rullgård wrote:
Martin Storsjö <[email protected]> writes:
SDL 1.3 (which is the current version available e.g. in
macports) doesn't contain SDL_Linked_Version.
The current check for SDL_Linked_Version (available since SDL
1.2.13) was added 8f1b06c8, because including the headers for
SDL_Init redirects the main function, requiring linking the
SDLmain library for linking to work. When using the normal
function checks in configure, we don't link to any extra
libraries.
---
configure | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/configure b/configure
index 7418bca..3e24f00 100755
--- a/configure
+++ b/configure
@@ -2983,7 +2983,8 @@ if enabled libdc1394; then
die "ERROR: No version of libdc1394 found "
fi
-if check_pkg_config sdl SDL_version.h SDL_Linked_Version; then
+if check_pkg_config sdl SDL_version.h SDL_Linked_Version ||
+ check_pkg_config sdl SDL.h SDL_Init; then
If checking for SDL_Init works at all, then there should be no need to
check for SDL_Linked_Version.
It doesn't, on the platforms where SDL redirects the main function.
Thankfully, the new ones that lack SDL_Linked_Version don't do any such
redirection afaik.
That is - the headers that define SDL_Init also redefine main, to redirect
initialization via their main wrapper. If this header is included, one has
to link with the SDLmain library, otherwise one ends up with undefined
references to main.
We could either link to this library while checking for SDL_Init - that
was one suggestion back when 8f1b06c8 was made - but we chose to test a
different function from a different header, which didn't include the main
redirection, instead of modifying check_pkg_config and the related
functions.
// Martin
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