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php-src/Zend/Zend.m4
Alex Dowad 7e2147be23 Clean up some unused code (and fix some comments) in build scripts 
- Fix typo in build/php.m4

- Nothing uses HAVE_INTTYPES_H; so remove check for header file

- Nothing defines ZEND_ACCONFIG_H_NO_C_PROTOS; so remove #ifndef

- `format_money` was removed in 2019, so <monetary.h> no longer needed

- Nothing uses HAVE_NETDB_H; so remove check for header file

- Nothing checks HAVE_TERMIOS_H; so remove check for header file

    (This was actually added when Wez Furlong was adding the original implementation of
    PTY support in `proc_open`, since replaced.)

- Nothing checks HAVE_SYS_AUXV_H; so remove check for header file

- PHP_BUILD_DATE variable is not used for anything, so remove it

    This variable was added to the Makefile, but from there, was not used for anything.
    The comments suggest it was intended to allow 'reproducible builds'. Presumably,
    this means that if a bug is found in a PHP binary somewhere, one could look at the
    Makefile which it was built from, see the date, and then could check the same
    code version out from source control. But... there can easily be multiple commits
    to the repo in the same day. Also, what makes us think that the Makefile which a
    binary was built from will be easily available?

    Besides, ext/standard/info.c already embeds the build date and time in each binary...
    but it does it using `__DATE__` and `__TIME__` (see `php_print_info`).

- Nothing checks HAVE_FINITE; so don't check for function

- Grammar fix to comment in build/php.m4

- Nothing sets $php_ldflags_add_usr_lib variable in configure, so remove conditional

    This was added in 2002, when Rasmus was having difficulty building PHP on some
    host and needed to have /usr/lib in the rpath. It was never documented and
    probably has never been used by anyone else.
2020-06-19 22:04:52 +02:00

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dnl This file contains Zend specific autoconf macros.
dnl
dnl ZEND_CHECK_FLOAT_PRECISION
dnl
dnl x87 floating point internal precision control checks
dnl See: http://wiki.php.net/rfc/rounding
dnl
AC_DEFUN([ZEND_CHECK_FLOAT_PRECISION],[
AC_MSG_CHECKING([for usable _FPU_SETCW])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <fpu_control.h>
]],[[
fpu_control_t fpu_oldcw, fpu_cw;
volatile double result;
double a = 2877.0;
volatile double b = 1000000.0;
_FPU_GETCW(fpu_oldcw);
fpu_cw = (fpu_oldcw & ~_FPU_EXTENDED & ~_FPU_SINGLE) | _FPU_DOUBLE;
_FPU_SETCW(fpu_cw);
result = a / b;
_FPU_SETCW(fpu_oldcw);
]])],[ac_cfp_have__fpu_setcw=yes],[ac_cfp_have__fpu_setcw=no])
if test "$ac_cfp_have__fpu_setcw" = "yes" ; then
AC_DEFINE(HAVE__FPU_SETCW, 1, [whether _FPU_SETCW is present and usable])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
AC_MSG_CHECKING([for usable fpsetprec])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <machine/ieeefp.h>
]],[[
fp_prec_t fpu_oldprec;
volatile double result;
double a = 2877.0;
volatile double b = 1000000.0;
fpu_oldprec = fpgetprec();
fpsetprec(FP_PD);
result = a / b;
fpsetprec(fpu_oldprec);
]])], [ac_cfp_have_fpsetprec=yes], [ac_cfp_have_fpsetprec=no])
if test "$ac_cfp_have_fpsetprec" = "yes" ; then
AC_DEFINE(HAVE_FPSETPREC, 1, [whether fpsetprec is present and usable])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
AC_MSG_CHECKING([for usable _controlfp])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <float.h>
]],[[
unsigned int fpu_oldcw;
volatile double result;
double a = 2877.0;
volatile double b = 1000000.0;
fpu_oldcw = _controlfp(0, 0);
_controlfp(_PC_53, _MCW_PC);
result = a / b;
_controlfp(fpu_oldcw, _MCW_PC);
]])], [ac_cfp_have__controlfp=yes], [ac_cfp_have__controlfp=no])
if test "$ac_cfp_have__controlfp" = "yes" ; then
AC_DEFINE(HAVE__CONTROLFP, 1, [whether _controlfp is present usable])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
AC_MSG_CHECKING([for usable _controlfp_s])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <float.h>
]],[[
unsigned int fpu_oldcw, fpu_cw;
volatile double result;
double a = 2877.0;
volatile double b = 1000000.0;
_controlfp_s(&fpu_cw, 0, 0);
fpu_oldcw = fpu_cw;
_controlfp_s(&fpu_cw, _PC_53, _MCW_PC);
result = a / b;
_controlfp_s(&fpu_cw, fpu_oldcw, _MCW_PC);
]])], [ac_cfp_have__controlfp_s=yes], [ac_cfp_have__controlfp_s=no])
if test "$ac_cfp_have__controlfp_s" = "yes" ; then
AC_DEFINE(HAVE__CONTROLFP_S, 1, [whether _controlfp_s is present and usable])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
AC_MSG_CHECKING([whether FPU control word can be manipulated by inline assembler])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
/* nothing */
]],[[
unsigned int oldcw, cw;
volatile double result;
double a = 2877.0;
volatile double b = 1000000.0;
__asm__ __volatile__ ("fnstcw %0" : "=m" (*&oldcw));
cw = (oldcw & ~0x0 & ~0x300) | 0x200;
__asm__ __volatile__ ("fldcw %0" : : "m" (*&cw));
result = a / b;
__asm__ __volatile__ ("fldcw %0" : : "m" (*&oldcw));
]])], [ac_cfp_have_fpu_inline_asm_x86=yes], [ac_cfp_have_fpu_inline_asm_x86=no])
if test "$ac_cfp_have_fpu_inline_asm_x86" = "yes" ; then
AC_DEFINE(HAVE_FPU_INLINE_ASM_X86, 1, [whether FPU control word can be manipulated by inline assembler])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
])
dnl
dnl LIBZEND_BASIC_CHECKS
dnl
dnl Basic checks specific for the Zend engine library.
dnl
AC_DEFUN([LIBZEND_BASIC_CHECKS],[
AC_REQUIRE([AC_PROG_CC])
AC_CHECK_HEADERS([cpuid.h])
dnl
dnl LIBZEND_DLSYM_CHECK
dnl
dnl Ugly hack to check if dlsym() requires a leading underscore in symbol name.
dnl
AC_DEFUN([LIBZEND_DLSYM_CHECK],[
AC_MSG_CHECKING([whether dlsym() requires a leading underscore in symbol names])
_LT_AC_TRY_DLOPEN_SELF([
AC_MSG_RESULT(no)
], [
AC_MSG_RESULT(yes)
AC_DEFINE(DLSYM_NEEDS_UNDERSCORE, 1, [Define if dlsym() requires a leading underscore in symbol names. ])
], [
AC_MSG_RESULT(no)
], [])
])
dnl Checks for library functions.
AC_CHECK_FUNCS(getpid kill sigsetjmp)
ZEND_CHECK_FLOAT_PRECISION
dnl Test whether double cast to long preserves least significant bits.
AC_MSG_CHECKING(whether double cast to long preserves least significant bits)
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <limits.h>
#include <stdlib.h>
int main()
{
if (sizeof(long) == 4) {
double d = (double) LONG_MIN * LONG_MIN + 2e9;
if ((long) d == 2e9 && (long) -d == -2e9) {
exit(0);
}
} else if (sizeof(long) == 8) {
double correct = 18e18 - ((double) LONG_MIN * -2); /* Subtract ULONG_MAX + 1 */
if ((long) 18e18 == correct) { /* On 64-bit, only check between LONG_MAX and ULONG_MAX */
exit(0);
}
}
exit(1);
}
]])], [
AC_DEFINE([ZEND_DVAL_TO_LVAL_CAST_OK], 1, [Define if double cast to long preserves least significant bits])
AC_MSG_RESULT(yes)
], [
AC_MSG_RESULT(no)
], [
AC_MSG_RESULT(no)
])
])
dnl
dnl LIBZEND_OTHER_CHECKS
dnl
AC_DEFUN([LIBZEND_OTHER_CHECKS],[
AC_ARG_ENABLE([zts],
[AS_HELP_STRING([--enable-zts],
[Enable thread safety])],
[ZEND_ZTS=$enableval],
[ZEND_ZTS=no])
AC_MSG_CHECKING(whether to enable thread-safety)
AC_MSG_RESULT($ZEND_ZTS)
AC_MSG_CHECKING(whether to enable Zend debugging)
AC_MSG_RESULT($ZEND_DEBUG)
if test "$ZEND_DEBUG" = "yes"; then
AC_DEFINE(ZEND_DEBUG,1,[ ])
echo " $CFLAGS" | grep ' -g' >/dev/null || DEBUG_CFLAGS="-g"
if test "$CFLAGS" = "-g -O2"; then
CFLAGS=-g
fi
else
AC_DEFINE(ZEND_DEBUG,0,[ ])
fi
test -n "$GCC" && CFLAGS="$CFLAGS -Wall -Wextra -Wno-strict-aliasing -Wno-implicit-fallthrough -Wno-unused-parameter -Wno-sign-compare"
dnl Check if compiler supports -Wno-clobbered (only GCC)
AX_CHECK_COMPILE_FLAG([-Wno-clobbered], CFLAGS="$CFLAGS -Wno-clobbered", , [-Werror])
test -n "$DEBUG_CFLAGS" && CFLAGS="$CFLAGS $DEBUG_CFLAGS"
if test "$ZEND_ZTS" = "yes"; then
AC_DEFINE(ZTS,1,[ ])
CFLAGS="$CFLAGS -DZTS"
fi
AC_C_INLINE
AC_MSG_CHECKING(target system is Darwin)
if echo "$target" | grep "darwin" > /dev/null; then
AC_DEFINE([DARWIN], 1, [Define if the target system is darwin])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
dnl Test and set the alignment define for ZEND_MM. This also does the
dnl logarithmic test for ZEND_MM.
AC_MSG_CHECKING(for MM alignment and log values)
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <stdlib.h>
typedef union _mm_align_test {
void *ptr;
double dbl;
long lng;
} mm_align_test;
#if (defined (__GNUC__) && __GNUC__ >= 2)
#define ZEND_MM_ALIGNMENT (__alignof__ (mm_align_test))
#else
#define ZEND_MM_ALIGNMENT (sizeof(mm_align_test))
#endif
int main()
{
int i = ZEND_MM_ALIGNMENT;
int zeros = 0;
FILE *fp;
while (i & ~0x1) {
zeros++;
i = i >> 1;
}
fp = fopen("conftest.zend", "w");
fprintf(fp, "%d %d\n", ZEND_MM_ALIGNMENT, zeros);
fclose(fp);
exit(0);
}
]])], [
LIBZEND_MM_ALIGN=`cat conftest.zend | cut -d ' ' -f 1`
LIBZEND_MM_ALIGN_LOG2=`cat conftest.zend | cut -d ' ' -f 2`
AC_DEFINE_UNQUOTED(ZEND_MM_ALIGNMENT, $LIBZEND_MM_ALIGN, [ ])
AC_DEFINE_UNQUOTED(ZEND_MM_ALIGNMENT_LOG2, $LIBZEND_MM_ALIGN_LOG2, [ ])
], [], [
dnl Cross compilation needs something here.
LIBZEND_MM_ALIGN=8
])
AC_MSG_RESULT(done)
AC_CHECK_FUNCS(mremap)
AC_ARG_ENABLE([zend-signals],
[AS_HELP_STRING([--disable-zend-signals],
[whether to enable zend signal handling])],
[ZEND_SIGNALS=$enableval],
[ZEND_SIGNALS=yes])
AC_CHECK_FUNCS([sigaction], [], [
ZEND_SIGNALS=no
])
if test "$ZEND_SIGNALS" = "yes"; then
AC_DEFINE(ZEND_SIGNALS, 1, [Use zend signal handling])
CFLAGS="$CFLAGS -DZEND_SIGNALS"
fi
AC_MSG_CHECKING(whether to enable zend signal handling)
AC_MSG_RESULT($ZEND_SIGNALS)
])
AC_MSG_CHECKING(whether /dev/urandom exists)
if test -r "/dev/urandom" && test -c "/dev/urandom"; then
AC_DEFINE([HAVE_DEV_URANDOM], 1, [Define if the target system has /dev/urandom device])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
AC_ARG_ENABLE([gcc-global-regs],
[AS_HELP_STRING([--disable-gcc-global-regs],
[whether to enable GCC global register variables])],
[ZEND_GCC_GLOBAL_REGS=$enableval],
[ZEND_GCC_GLOBAL_REGS=yes])
AC_MSG_CHECKING(for global register variables support)
if test "$ZEND_GCC_GLOBAL_REGS" != "no"; then
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#if defined(__GNUC__)
# define ZEND_GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
#else
# define ZEND_GCC_VERSION 0
#endif
#if defined(__GNUC__) && ZEND_GCC_VERSION >= 4008 && defined(i386)
# define ZEND_VM_FP_GLOBAL_REG "%esi"
# define ZEND_VM_IP_GLOBAL_REG "%edi"
#elif defined(__GNUC__) && ZEND_GCC_VERSION >= 4008 && defined(__x86_64__)
# define ZEND_VM_FP_GLOBAL_REG "%r14"
# define ZEND_VM_IP_GLOBAL_REG "%r15"
#elif defined(__GNUC__) && ZEND_GCC_VERSION >= 4008 && defined(__powerpc64__)
# define ZEND_VM_FP_GLOBAL_REG "r28"
# define ZEND_VM_IP_GLOBAL_REG "r29"
#elif defined(__IBMC__) && ZEND_GCC_VERSION >= 4002 && defined(__powerpc64__)
# define ZEND_VM_FP_GLOBAL_REG "r28"
# define ZEND_VM_IP_GLOBAL_REG "r29"
#elif defined(__GNUC__) && ZEND_GCC_VERSION >= 4008 && defined(__aarch64__)
# define ZEND_VM_FP_GLOBAL_REG "x27"
# define ZEND_VM_IP_GLOBAL_REG "x28"
#else
# error "global register variables are not supported"
#endif
typedef int (*opcode_handler_t)(void);
register void *FP __asm__(ZEND_VM_FP_GLOBAL_REG);
register const opcode_handler_t *IP __asm__(ZEND_VM_IP_GLOBAL_REG);
int emu(const opcode_handler_t *ip, void *fp) {
const opcode_handler_t *orig_ip = IP;
void *orig_fp = FP;
IP = ip;
FP = fp;
while ((*ip)());
FP = orig_fp;
IP = orig_ip;
}
]], [[
]])], [
ZEND_GCC_GLOBAL_REGS=yes
], [
ZEND_GCC_GLOBAL_REGS=no
])
fi
if test "$ZEND_GCC_GLOBAL_REGS" = "yes"; then
AC_DEFINE([HAVE_GCC_GLOBAL_REGS], 1, [Define if the target system has support for global register variables])
else
HAVE_GCC_GLOBAL_REGS=no
fi
AC_MSG_RESULT($ZEND_GCC_GLOBAL_REGS)
dnl Check whether __cpuid_count is available.
AC_CACHE_CHECK(whether __cpuid_count is available, ac_cv_cpuid_count_available, [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <cpuid.h>
]], [[
unsigned eax, ebx, ecx, edx;
__cpuid_count(0, 0, eax, ebx, ecx, edx);
]])], [
ac_cv_cpuid_count_available=yes
], [
ac_cv_cpuid_count_available=no
])])
if test "$ac_cv_cpuid_count_available" = "yes"; then
AC_DEFINE([HAVE_CPUID_COUNT], 1, [whether __cpuid_count is available])
fi
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