diff options
Diffstat (limited to 'ld/configure')
| -rwxr-xr-x | ld/configure | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/ld/configure b/ld/configure index 8a7bd207c53..7af2626d5bc 100755 --- a/ld/configure +++ b/ld/configure @@ -16549,6 +16549,188 @@ fi fi +for ac_header in stdlib.h unistd.h +do : + as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh` +ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default" +eval as_val=\$$as_ac_Header + if test "x$as_val" = x""yes; then : + cat >>confdefs.h <<_ACEOF +#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1 +_ACEOF + +fi + +done + +for ac_func in getpagesize +do : + ac_fn_c_check_func "$LINENO" "getpagesize" "ac_cv_func_getpagesize" +if test "x$ac_cv_func_getpagesize" = x""yes; then : + cat >>confdefs.h <<_ACEOF +#define HAVE_GETPAGESIZE 1 +_ACEOF + +fi +done + +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for working mmap" >&5 +$as_echo_n "checking for working mmap... " >&6; } +if test "${ac_cv_func_mmap_fixed_mapped+set}" = set; then : + $as_echo_n "(cached) " >&6 +else + if test "$cross_compiling" = yes; then : + ac_cv_func_mmap_fixed_mapped=no +else + cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ +$ac_includes_default +/* malloc might have been renamed as rpl_malloc. */ +#undef malloc + +/* Thanks to Mike Haertel and Jim Avera for this test. + Here is a matrix of mmap possibilities: + mmap private not fixed + mmap private fixed at somewhere currently unmapped + mmap private fixed at somewhere already mapped + mmap shared not fixed + mmap shared fixed at somewhere currently unmapped + mmap shared fixed at somewhere already mapped + For private mappings, we should verify that changes cannot be read() + back from the file, nor mmap's back from the file at a different + address. (There have been systems where private was not correctly + implemented like the infamous i386 svr4.0, and systems where the + VM page cache was not coherent with the file system buffer cache + like early versions of FreeBSD and possibly contemporary NetBSD.) + For shared mappings, we should conversely verify that changes get + propagated back to all the places they're supposed to be. + + Grep wants private fixed already mapped. + The main things grep needs to know about mmap are: + * does it exist and is it safe to write into the mmap'd area + * how to use it (BSD variants) */ + +#include <fcntl.h> +#include <sys/mman.h> + +#if !defined STDC_HEADERS && !defined HAVE_STDLIB_H +char *malloc (); +#endif + +/* This mess was copied from the GNU getpagesize.h. */ +#ifndef HAVE_GETPAGESIZE +/* Assume that all systems that can run configure have sys/param.h. */ +# ifndef HAVE_SYS_PARAM_H +# define HAVE_SYS_PARAM_H 1 +# endif + +# ifdef _SC_PAGESIZE +# define getpagesize() sysconf(_SC_PAGESIZE) +# else /* no _SC_PAGESIZE */ +# ifdef HAVE_SYS_PARAM_H +# include <sys/param.h> +# ifdef EXEC_PAGESIZE +# define getpagesize() EXEC_PAGESIZE +# else /* no EXEC_PAGESIZE */ +# ifdef NBPG +# define getpagesize() NBPG * CLSIZE +# ifndef CLSIZE +# define CLSIZE 1 +# endif /* no CLSIZE */ +# else /* no NBPG */ +# ifdef NBPC +# define getpagesize() NBPC +# else /* no NBPC */ +# ifdef PAGESIZE +# define getpagesize() PAGESIZE +# endif /* PAGESIZE */ +# endif /* no NBPC */ +# endif /* no NBPG */ +# endif /* no EXEC_PAGESIZE */ +# else /* no HAVE_SYS_PARAM_H */ +# define getpagesize() 8192 /* punt totally */ +# endif /* no HAVE_SYS_PARAM_H */ +# endif /* no _SC_PAGESIZE */ + +#endif /* no HAVE_GETPAGESIZE */ + +int +main () +{ + char *data, *data2, *data3; + int i, pagesize; + int fd; + + pagesize = getpagesize (); + + /* First, make a file with some known garbage in it. */ + data = (char *) malloc (pagesize); + if (!data) + return 1; + for (i = 0; i < pagesize; ++i) + *(data + i) = rand (); + umask (0); + fd = creat ("conftest.mmap", 0600); + if (fd < 0) + return 1; + if (write (fd, data, pagesize) != pagesize) + return 1; + close (fd); + + /* Next, try to mmap the file at a fixed address which already has + something else allocated at it. If we can, also make sure that + we see the same garbage. */ + fd = open ("conftest.mmap", O_RDWR); + if (fd < 0) + return 1; + data2 = (char *) malloc (2 * pagesize); + if (!data2) + return 1; + data2 += (pagesize - ((long int) data2 & (pagesize - 1))) & (pagesize - 1); + if (data2 != mmap (data2, pagesize, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_FIXED, fd, 0L)) + return 1; + for (i = 0; i < pagesize; ++i) + if (*(data + i) != *(data2 + i)) + return 1; + + /* Finally, make sure that changes to the mapped area do not + percolate back to the file as seen by read(). (This is a bug on + some variants of i386 svr4.0.) */ + for (i = 0; i < pagesize; ++i) + *(data2 + i) = *(data2 + i) + 1; + data3 = (char *) malloc (pagesize); + if (!data3) + return 1; + if (read (fd, data3, pagesize) != pagesize) + return 1; + for (i = 0; i < pagesize; ++i) + if (*(data + i) != *(data3 + i)) + return 1; + close (fd); + return 0; +} +_ACEOF +if ac_fn_c_try_run "$LINENO"; then : + ac_cv_func_mmap_fixed_mapped=yes +else + ac_cv_func_mmap_fixed_mapped=no +fi +rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \ + conftest.$ac_objext conftest.beam conftest.$ac_ext +fi + +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_mmap_fixed_mapped" >&5 +$as_echo "$ac_cv_func_mmap_fixed_mapped" >&6; } +if test $ac_cv_func_mmap_fixed_mapped = yes; then + +$as_echo "#define HAVE_MMAP 1" >>confdefs.h + +fi +rm -f conftest.mmap + + { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing dlopen" >&5 $as_echo_n "checking for library containing dlopen... " >&6; } if test "${ac_cv_search_dlopen+set}" = set; then : |