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author | Andy Dougherty <doughera@lafayette.edu> | 2019-01-23 21:39:39 -0500 |
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committer | Andy Dougherty <doughera@lafayette.edu> | 2019-01-23 21:39:39 -0500 |
commit | f8d82a1010426d0eb49c33cb903413b882c85c3e (patch) | |
tree | 7ae005dda2b85e4376cedd8ddf3235eb300f9c42 /Configure | |
parent | 63c1fa6a98bc60234a21de83dd191cd581a5d073 (diff) | |
download | perl-f8d82a1010426d0eb49c33cb903413b882c85c3e.tar.gz |
Another attempt to improve Configure detection of memmem() [perl #133760].
This updates commit ca152fd8207cf53816b1407d5f54f6ea160a3ef8.
Linux systems have memmem, but the prototype in <string.h> is only
visible if __GNU_SOURCE is defined. This version tests for both the
prototype in <string.h> and the symbol in libc. (Thanks to Tony C. for
the suggestion.) (For BSD systems, no extra define is needed.)
Diffstat (limited to 'Configure')
-rwxr-xr-x | Configure | 58 |
1 files changed, 18 insertions, 40 deletions
@@ -16156,47 +16156,25 @@ set mbtowc d_mbtowc eval $inlibc : see if memmem exists +: We need both a prototype in string.h and the symbol in libc. echo " " -echo "Checking if you have a working memmem()" >&4 -$cat >try.c <<EOCP -#$d_gnulibc HAS_GNULIBC /**/ -#if defined(HAS_GNULIBC) && !defined(_GNU_SOURCE) -# define _GNU_SOURCE -#endif -#include <stdio.h> -#include <stdlib.h> -#include <stddef.h> -#include <string.h> -int main(int argc, char **argv) -{ - char *big = "abcdefghiabcdefghi"; - char *little = "def"; - char *rtn; - ptrdiff_t diff; - rtn = (char *) memmem(big, strlen(big), little, strlen(little)); - diff = rtn - big; - exit(diff == 3 ? EXIT_SUCCESS : EXIT_FAILURE); -} -EOCP -set try -if eval $compile; then - `$run ./try` - rc=$? - case "$rc" in - 0) echo "Yes, you do." >&4 - val="$define" - ;; - *) echo "Well, you have memmem, but it isn't working." >&4 - val="$undef" - ;; - esac -else - echo "No, you do not." >&4 - val="$undef" -fi -set d_memmem -eval $setvar -$rm_try +d_memmem_proto='' +xx1="#$d_gnulibc HAS_GNULIBC" +xx2='#if defined(HAS_GNULIBC) && !defined(_GNU_SOURCE)' +xx3='# define _GNU_SOURCE' +xx4='#endif' +set d_memmem_proto memmem literal "$xx1" literal "$xx2" literal "$xx3" literal "$xx4" define string.h +eval $hasproto +case "$d_memmem_proto" in + define) # see if memmem exists + set memmem d_memmem + eval $inlibc + ;; + *) val=$undef + set d_memmem + eval $setvar + ;; +esac : see if memrchr exists set memrchr d_memrchr |