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build: Rework ABI selection logic

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Add a new LIBBSD_SELECT_ABI m4 macro, and use it to setup the ABI
interfaces to expose and the various variables and conditionals
to be used by the build system.

Switch to set the initial values to unknown and then set every one
of the selections explicitly by supported target.

Update comments for rationale for things to DROP, or for why some
selections are enabled.
This commit is contained in:
Guillem Jover
2024-02-14 04:59:44 +01:00
parent 99739877be
commit 27503a1066
2 changed files with 78 additions and 34 deletions
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16
m4/libbsd-compiler.m4
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@@ -70,3 +70,19 @@ int main() { return rc; }
AM_CONDITIONAL([BUILD_LIBBSD_CTOR],
[test "$libbsd_cv_gnu_init_array_support" = yes])
])
# LIBBSD_SELECT_ABI(name, desc)
# -----------------
AC_DEFUN([LIBBSD_SELECT_ABI], [
AS_IF([test -z "$AS_TR_SH([abi_$1])"], [
AC_MSG_ERROR([missing ABI selection for $1])
], [test "$AS_TR_SH([abi_$1])" = "unknown"], [
AC_MSG_ERROR([unknown ABI selection for $1])
], [test "$AS_TR_SH([abi_$1])" = "yes"], [
AC_DEFINE(AS_TR_CPP([LIBBSD_ABI_$1]), [1], [Provide ABI for $2])
], [
AC_DEFINE(AS_TR_CPP([LIBBSD_ABI_$1]), [0])
])
AM_CONDITIONAL(AS_TR_CPP([ABI_$1]),
[test "x$AS_TR_SH([abi_$1])" = "xyes"])
])