Make use of check_include_files to be able to also include
stdint.h when checking for the headers. Fixes detection of
usbhid.h on OpenBSD.
/usr/include/usbhid.h:40:2: error: unknown type name 'uint32_t'
40 | uint32_t _usage_page;
| ^
GTK explicitly doesn't support being used setuid or setgid, and if SDL
loads and initializes GTK, GTK will exit the process if it
detects a setgid executable. This is incompatible with the historical
practice of making game executables setgid in order to write out a
shared high-score table on multi-user systems (which is security theatre
at best, because typical game runtime libraries are not hardened against
an untrusted caller, but making it regress would be a user-observable
regression in sdl2-compat).
Helps: https://github.com/libsdl-org/sdl2-compat/issues/564
Signed-off-by: Simon McVittie <smcv@debian.org>
A common use case is asking someone to clone SDL and run a test. This simplifies the instructions so we don't also have to tell them how to enable the tests. Anyone savvy can just add -DSDL_TESTS=OFF if they don't want to have them.
This PR adds support to the cmake build scripts so to allow building SDL with the Tiny C Compiler (tcc).
TinyCC supports the subset of C99 used by SDL and will complete the build once the --version-script linker flag is removed. The changes have been tested with various build configurations, including X11 and Wayland, and using tcc version 0.9.28rc 2025-10-27 mob@f4e01bfc on x86_64 Linux.
Allowing GCC/Clang to auto-vectorize with AltiVec support breaks support
for non-AltiVec compatible processors. Adding this option allows the
existing AltiVec specific code to function as it always did, but
prevents the compiler from inserting AltiVec instructions into arbitrary
codepaths that SDL can't gate off via the existing CPUInfo code.
Allows for finer grained timeout values, and fixes a FIXME.
This also drops the legacy select() fallback path in favor of presuming that poll() is always available. poll() is part of the POSIX.1-2001 standard, has been available in Unix since some time in the 1980s, the BSDs since at least the early 90s, and Linux since kernel 2.1, which predates kernel support for Pthreads. glibc also has its own emulation using select(), if necessary.
We can tell it's SDL 3 from the version number and git revision,
so there's no need to duplicate that in the prefix.
Signed-off-by: Simon McVittie <smcv@collabora.com>
It always fails, because we don't set the needed link library, i.e. shcore.
Besides, SDL3.dll doesn't link to shcore.dll, it links to it at runtime, so
it is unnecessary to check for that symbol here.
Reference issue: https://github.com/libsdl-org/SDL/pull/13904
