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Reviewed GLFW compilation requirements on Linux: _GNU_SOURCE

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Reasons to NOT define `_GNU_SOURCE`:

 - access to lots of nonstandard GNU/Linux extension functions
 - access to traditional functions which were omitted from the POSIX standard (often for good reason, such as being replaced with better alternatives, or being tied to particular legacy implementations)
 - access to low-level functions that cannot be portable, but that you sometimes need for implementing system utilities like mount, ifconfig, etc.
 - broken behavior for lots of POSIX-specified functions, where the GNU folks disagreed with the standards committee on how the functions should behave and decided to do their own thing.
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Ray
2022-08-28 15:48:12 +02:00
parent be2328f848
commit 7f5567eec0
3 changed files with 1 additions and 2 deletions
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src/Makefile
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@ -307,6 +307,7 @@ endif
# -Wno-missing-braces ignore invalid warning (GCC bug 53119)
# -Wno-unused-value ignore unused return values of some functions (i.e. fread())
# -D_DEFAULT_SOURCE use with -std=c99 on Linux and PLATFORM_WEB, required for timespec
# -D_GNU_SOURCE access to lots of nonstandard GNU/Linux extension functions
# -Werror=pointer-arith catch unportable code that does direct arithmetic on void pointers
# -fno-strict-aliasing jar_xm.h does shady stuff (breaks strict aliasing)
CFLAGS = -Wall -D_GNU_SOURCE -D$(PLATFORM) -D$(GRAPHICS) -Wno-missing-braces -Werror=pointer-arith -fno-strict-aliasing $(CUSTOM_CFLAGS)