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authorLibravatar Jonathan Nieder <jrnieder@gmail.com>2011-03-08 02:33:44 -0600
committerLibravatar Junio C Hamano <gitster@pobox.com>2011-03-08 12:02:31 -0800
commit26db0f2e3afc043e184a5e0ce5eb7c53aeb1f644 (patch)
tree2a3fb0dcbfac0afb11ed2e23b39c3f88a2f5cac4 /builtin/mktag.c
parentstrbuf: add strbuf_vaddf (diff)
downloadtgif-26db0f2e3afc043e184a5e0ce5eb7c53aeb1f644.tar.xz
compat: fall back on __va_copy if available
Since an obvious implementation of va_list is to make it a pointer into the stack frame, implementing va_copy as "dst = src" will work on many systems. Platforms that use something different (e.g., a size-1 array of structs, to be assigned with *(dst) = *(src)) will need some other compatibility macro, though. Luckily, as the glibc manual hints, such systems tend to provide the __va_copy macro (introduced in GCC in March, 1997). By using that if it is available, we can cover our bases pretty well. Discovered by building with CC="gcc -std=c89" on an amd64 machine: $ make CC=c89 strbuf.o [...] strbuf.c: In function 'strbuf_vaddf': strbuf.c:211:2: error: incompatible types when assigning to type 'va_list' from type 'struct __va_list_tag *' make: *** [strbuf.o] Error 1 Explained-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/mktag.c')
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