On Tuesday, 6 January 2026 17:11:25 Brasilia Standard Time Jens Maurer via
Std-Proposals wrote:
> My point is that there's no point in optimizing the design in
> that respect. Those that "#define x" to something deserve to
> be broken.

I agree with the sentiment, but cleaning up may be difficult. There are quite a
few very old APIs that do #define of lowercase entities.

Just a quick examples found by grepping through my /usr/include that aren't
expanding to other identifiers and aren't function-like macros:

X11:
#define black_width 16
#define target_width 16
#define target_height 16
#define xterm_width 48
#define xterm_height 48
#define numInputClasses 7

Linux/POSIX:
#define sa_handler _u._sa_handler
#define si_pid _sifields._kill._pid
#define s6_addr in6_u.u6_addr8

#define no_argument 0
#define required_argument 1
#define optional_argument 2

POSIX ncurses:
#define columns CUR Numbers[0]
#define lines CUR Numbers[2]

glib:
it basically reserves the g_ prefix its entirety for itself

OpenSSL:
# define ub_name 32768
#define acpted_rply ru.RM_rmb.ru.RP_ar

MySQL/MariaDB:
#define packet_error ((unsigned int) -1)
#if defined(_WIN64)
#define my_socket unsigned long long
#elif defined(_WIN32)
#define my_socket unsigned int
#else
typedef int my_socket;
#endif

Eigen:
#define advanceRows ((LhsIsReal) ? 1 : 2)

Zlib:
# define local static

And you may remember Qt's
#define signals public
#define slots
#define emit

I won't even go into Win32, with things like:
#define small char
#define interface struct

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Principal Engineer - Intel Data Center - Platform & Sys. Eng.