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43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
# AC_C_ALIGNOF
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# ------------
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# Check whether the C compiler supports the alignof(type) operator
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AC_DEFUN([AC_C_ALIGNOF],
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[
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AC_CACHE_CHECK([for alignof],ac_cv_c_alignof,
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[ac_cv_c_alignof=no
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for ac_kw in alignof __alignof __alignof__; do
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([], [int align = $ac_kw (int);])],
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[ac_cv_c_alignof=$ac_kw; break])
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done])
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if test $ac_cv_c_alignof != no; then
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AC_DEFINE([HAVE_ALIGNOF], 1,
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[Define to 1 if alignof works on your compiler])
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if test $ac_cv_c_alignof != alignof; then
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AC_DEFINE_UNQUOTED([alignof], [$ac_cv_c_alignof],
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[Define to the name of the alignof operator.])
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fi
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fi
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])
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# AC_C_FAM_IN_MEM
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# ---------------
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# Check whether the C compiler supports a flexible array member
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# in a struct that is the (last) member of a struct
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AC_DEFUN([AC_C_FAM_IN_MEM],
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[
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AC_CACHE_CHECK([for flexible array members in struct members],
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ac_cv_c_fam_in_mem,
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([
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struct { struct { char foo[]; } bar; } baz;
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])],
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[ac_cv_c_fam_in_mem=yes],
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[ac_cv_c_fam_in_mem=no])])
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if test $ac_cv_c_fam_in_mem = yes; then
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AC_DEFINE([CAN_HAVE_FAM_IN_MEMBER], 1,
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[Define to 1 if a struct with flexible array members can be
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the last member of another struct.])
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fi
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])
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