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Temporary fix for bug 4254 - a _lot_ of strict aliasing warnings

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Ozkan Sezer

A horde of strict aliasing violation warnings are emitted from joystick
layer, and also from a few other places. This happens with gcc-4.4.7 on
Linux CentOS 6.10.  Some other sysjoystick would possibly have the same
warnings.

Attached my full log here. Example entry:
src/joystick/SDL_joystick.c: In function 'SDL_GetJoystickGUIDInfo':
src/joystick/SDL_joystick.c:1094: warning: dereferencing pointer '({anonymous})' does break strict-aliasing rules
This commit is contained in:
Sam Lantinga
2019-06-08 18:32:29 -07:00
parent 31765242d6
commit 1b73d578f3
3 changed files with 68 additions and 1 deletions
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5
CMakeLists.txt
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@@ -418,6 +418,11 @@ if(USE_GCC OR USE_CLANG)
endif()
endif()
check_c_compiler_flag(-fno-strict-aliasing HAVE_GCC_NO_STRICT_ALIASING)
if(HAVE_GCC_NO_STRICT_ALIASING)
list(APPEND EXTRA_CFLAGS "-fno-strict-aliasing")
endif()
check_c_compiler_flag(-Wdeclaration-after-statement HAVE_GCC_WDECLARATION_AFTER_STATEMENT)
if(HAVE_GCC_WDECLARATION_AFTER_STATEMENT)
check_c_compiler_flag(-Werror=declaration-after-statement HAVE_GCC_WERROR_DECLARATION_AFTER_STATEMENT)