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| author | Karl Williamson <khw@cpan.org> | 2021-06-05 07:33:13 -0600 |
|---|---|---|
| committer | Karl Williamson <khw@cpan.org> | 2021-06-12 09:20:14 -0600 |
| commit | bfe5127121a2046fe9d996a64635f6f08d940528 (patch) | |
| tree | f624010676384b5484c0191c47b1cd430928b05b /Configure | |
| parent | 19c4b24fc62a1e8dd1f7dcaaf337d0eb11dbb6b0 (diff) | |
| download | perl-bfe5127121a2046fe9d996a64635f6f08d940528.tar.gz | |
Configure changes for HAS_NON_INT_BITFIELDS
This probe has been available without my realizing it had been merged.
Some compilers, chiefly IBM, use only integer-size bitfields, warning
when presented with other-sized ones. Allowing other-sized fields is an
extension to the C standard.
These warnings don't affect the correctness of the code generated, but
very many are generated per run, potentially overwhelming the reader
into not noticing warnings that are important.
Diffstat (limited to 'Configure')
| -rwxr-xr-x | Configure | 33 |
1 files changed, 33 insertions, 0 deletions
@@ -394,6 +394,7 @@ d_attribute_unused='' d_attribute_warn_unused_result='' d_printf_format_null='' d_backtrace='' +d_non_int_bitfields='' d_builtin_choose_expr='' d_builtin_expect='' d_builtin_add_overflow='' @@ -16541,6 +16542,37 @@ eval $inhdr set nl_langinfo d_nl_langinfo eval $inlibc +: Look for non 'int'-sized bitfields +case "$d_non_int_bitfields" in +'') +echo " " >&4 +echo "Checking whether your compiler can handle struct bitfields that aren't 'int' or 'unsigned int' ..." >&4 +$cat >try.c <<'EOCP' +#include <stdio.h> +struct foo { + unsigned char byte:1; + unsigned short halfword:1; +} bar; +EOCP +if $cc $ccflags -c try.c >try.out 2>&1 ; then + if $compiler_warning try.out >/dev/null 2>&1; then + echo "Your C compiler doesn't support struct bitfields that aren't 'int' or 'unsigned int'." >&4 + val="$undef" + else + echo "Your C compiler supports struct bitfields besides 'int' and 'unsigned int'." >&4 + val="$define" + fi +else + echo "Your C compiler doesn't seem to understand struct bitfields that aren't 'int' or 'unsigned int' at all." >&4 + val="$undef" +fi +;; +*) val="$d_non_int_bitfields" ;; +esac +set d_non_int_bitfields +eval $setvar +$rm_try + : see if this is a quadmath.h system set quadmath.h i_quadmath eval $inhdr @@ -24527,6 +24559,7 @@ d_nextafter='$d_nextafter' d_nexttoward='$d_nexttoward' d_nice='$d_nice' d_nl_langinfo='$d_nl_langinfo' +d_non_int_bitfields='$d_non_int_bitfields' d_nv_preserves_uv='$d_nv_preserves_uv' d_nv_zero_is_allbits_zero='$d_nv_zero_is_allbits_zero' d_off64_t='$d_off64_t' |