56a29d2c97
Remove the "else" branches of the HAVE_VARIADIC_MACROS macro, which have been unconditionally omitted since765dc16888(git-compat-util: always enable variadic macros, 2021-01-28). Since were always omitted, anyone trying to use a compiler without variadic macro support to compile a git since version git v2.31.0 or later would have had a compilation error. 10 months across a few releases since then should have been enough time for anyone who cared to run into that and report the issue. In addition to that, for anyone unsetting HAVE_VARIADIC_MACROS we've been emitting extremely verbose warnings since at leastee4512ed48(trace2: create new combined trace facility, 2019-02-22). That's because there is no such thing as a "region_enter_printf" or "region_leave_printf" format, so at least under GCC and Clang everything that includes trace.h (almost every file) emits a couple of warnings about that. There's a large benefit to being able to have a hard dependency rely on variadic macros, the code surrounding usage.c is hard to maintain if we need to write two implementations of everything, and by relying on "__FILE__" and "__LINE__" along with "__VA_ARGS__" we can in the future make error(), die() etc. log where they were called from. We've also recently mergedd67fc4bf0b(Merge branch 'bc/require-c99', 2021-12-10) which further cements our hard dependency on C99. So let's delete the fallback code, and update our CodingGuidelines to note that we depend on this. The added bullet-point starts with lower-case for consistency with other bullet-points in that section. The diff in "trace.h" is relatively hard to read, since we need to retain the existing API docs, which were comments on the code used if HAVE_VARIADIC_MACROS was not defined. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
41 lines
977 B
C
41 lines
977 B
C
#ifndef BANNED_H
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#define BANNED_H
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/*
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* This header lists functions that have been banned from our code base,
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* because they're too easy to misuse (and even if used correctly,
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* complicate audits). Including this header turns them into compile-time
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* errors.
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*/
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#define BANNED(func) sorry_##func##_is_a_banned_function
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#undef strcpy
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#define strcpy(x,y) BANNED(strcpy)
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#undef strcat
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#define strcat(x,y) BANNED(strcat)
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#undef strncpy
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#define strncpy(x,y,n) BANNED(strncpy)
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#undef strncat
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#define strncat(x,y,n) BANNED(strncat)
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#undef sprintf
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#undef vsprintf
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#define sprintf(...) BANNED(sprintf)
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#define vsprintf(...) BANNED(vsprintf)
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#undef gmtime
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#define gmtime(t) BANNED(gmtime)
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#undef localtime
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#define localtime(t) BANNED(localtime)
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#undef ctime
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#define ctime(t) BANNED(ctime)
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#undef ctime_r
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#define ctime_r(t, buf) BANNED(ctime_r)
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#undef asctime
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#define asctime(t) BANNED(asctime)
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#undef asctime_r
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#define asctime_r(t, buf) BANNED(asctime_r)
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#endif /* BANNED_H */
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