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Add configure tests for __builtin_clz/__builtin_clzl
This commit is contained in:
Todd C. Miller
1
MANIFEST
1
MANIFEST
@@ -452,6 +452,7 @@ m4/ax_check_compile_flag.m4
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m4/ax_check_link_flag.m4
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m4/ax_func_getaddrinfo.m4
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m4/ax_func_snprintf.m4
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m4/ax_gcc_builtin.m4
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m4/ax_prog_cc_for_build.m4
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m4/gettext.m4
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m4/hardening.m4
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1
aclocal.m4
vendored
1
aclocal.m4
vendored
@@ -17,6 +17,7 @@ m4_include([m4/ax_check_compile_flag.m4])
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m4_include([m4/ax_check_link_flag.m4])
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m4_include([m4/ax_func_getaddrinfo.m4])
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m4_include([m4/ax_func_snprintf.m4])
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m4_include([m4/ax_gcc_builtin.m4])
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m4_include([m4/ax_prog_cc_for_build.m4])
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m4_include([m4/gettext.m4])
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m4_include([m4/hardening.m4])
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@@ -1113,6 +1113,12 @@
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/* Define to 1 if you have the '_ttyname_dev' function. */
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#undef HAVE__TTYNAME_DEV
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/* Define to 1 if you have the '__builtin_clz' built-in function */
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#undef HAVE___BUILTIN_CLZ
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/* Define to 1 if you have the '__builtin_clzl' built-in function */
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#undef HAVE___BUILTIN_CLZL
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/* Define to 1 if the compiler supports the C99 __func__ variable. */
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#undef HAVE___FUNC__
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94
configure
vendored
94
configure
vendored
@@ -22766,6 +22766,100 @@ fi
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done
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for __builtin_clz" >&5
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printf %s "checking for __builtin_clz... " >&6; }
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if test ${ax_cv_have___builtin_clz+y}
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then :
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printf %s "(cached) " >&6
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else case e in #(
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e)
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main (void)
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{
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__builtin_clz(0)
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_link "$LINENO"
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then :
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ax_cv_have___builtin_clz=yes
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else case e in #(
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e) ax_cv_have___builtin_clz=no ;;
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esac
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.beam \
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conftest$ac_exeext conftest.$ac_ext
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;;
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esac
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fi
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_have___builtin_clz" >&5
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printf "%s\n" "$ax_cv_have___builtin_clz" >&6; }
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if test yes = $ax_cv_have___builtin_clz
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then :
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printf "%s\n" "#define HAVE___BUILTIN_CLZ 1" >>confdefs.h
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fi
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for __builtin_clzl" >&5
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printf %s "checking for __builtin_clzl... " >&6; }
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if test ${ax_cv_have___builtin_clzl+y}
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then :
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printf %s "(cached) " >&6
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else case e in #(
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e)
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main (void)
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{
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__builtin_clzl(0)
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_link "$LINENO"
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then :
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ax_cv_have___builtin_clzl=yes
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else case e in #(
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e) ax_cv_have___builtin_clzl=no ;;
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esac
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.beam \
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conftest$ac_exeext conftest.$ac_ext
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;;
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esac
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fi
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_have___builtin_clzl" >&5
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printf "%s\n" "$ax_cv_have___builtin_clzl" >&6; }
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if test yes = $ax_cv_have___builtin_clzl
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then :
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printf "%s\n" "#define HAVE___BUILTIN_CLZL 1" >>confdefs.h
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fi
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utmp_style=LEGACY
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for ac_func in getutsid getutxid getutid
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@@ -2725,6 +2725,8 @@ AC_CHECK_FUNCS([arc4random], [
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AC_CHECK_FUNCS([pthread_atfork])
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])
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])
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AX_GCC_BUILTIN(__builtin_clz)
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AX_GCC_BUILTIN(__builtin_clzl)
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utmp_style=LEGACY
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AC_CHECK_FUNCS([getutsid getutxid getutid], [utmp_style=POSIX; break])
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@@ -27,15 +27,6 @@
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#include "sudo_debug.h"
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#include "sudo_util.h"
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#if defined(__has_builtin)
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# if __has_builtin(__builtin_clz)
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# define HAVE___BUILTIN_CLZ
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# endif
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# if __has_builtin(__builtin_clzl)
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# define HAVE___BUILTIN_CLZL
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# endif
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#endif
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/*
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* Round 32-bit unsigned length to the next highest power of two.
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* Always returns at least 64.
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176
m4/ax_gcc_builtin.m4
Normal file
176
m4/ax_gcc_builtin.m4
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@@ -0,0 +1,176 @@
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_gcc_builtin.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_GCC_BUILTIN(BUILTIN)
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#
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# DESCRIPTION
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#
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# This macro checks if the compiler supports one of GCC's built-in
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# functions; many other compilers also provide those same built-ins.
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#
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# The BUILTIN parameter is the name of the built-in function.
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#
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# If BUILTIN is supported define HAVE_<BUILTIN>. Keep in mind that since
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# builtins usually start with two underscores they will be copied over
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# into the HAVE_<BUILTIN> definition (e.g. HAVE___BUILTIN_EXPECT for
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# __builtin_expect()).
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#
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# The macro caches its result in the ax_cv_have_<BUILTIN> variable (e.g.
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# ax_cv_have___builtin_expect).
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#
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# The macro currently supports the following built-in functions:
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#
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# __builtin_assume_aligned
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# __builtin_bswap16
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# __builtin_bswap32
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# __builtin_bswap64
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# __builtin_choose_expr
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# __builtin___clear_cache
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# __builtin_clrsb
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# __builtin_clrsbl
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# __builtin_clrsbll
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# __builtin_clz
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# __builtin_clzl
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# __builtin_clzll
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# __builtin_complex
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# __builtin_constant_p
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# __builtin_cpu_init
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# __builtin_cpu_is
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# __builtin_cpu_supports
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# __builtin_ctz
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# __builtin_ctzl
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# __builtin_ctzll
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# __builtin_expect
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# __builtin_ffs
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# __builtin_ffsl
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# __builtin_ffsll
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# __builtin_fpclassify
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# __builtin_huge_val
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# __builtin_huge_valf
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# __builtin_huge_vall
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# __builtin_inf
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# __builtin_infd128
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# __builtin_infd32
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# __builtin_infd64
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# __builtin_inff
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# __builtin_infl
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# __builtin_isinf_sign
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# __builtin_nan
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# __builtin_nand128
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# __builtin_nand32
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# __builtin_nand64
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# __builtin_nanf
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# __builtin_nanl
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# __builtin_nans
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# __builtin_nansf
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# __builtin_nansl
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# __builtin_object_size
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# __builtin_parity
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# __builtin_parityl
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# __builtin_parityll
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# __builtin_popcount
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# __builtin_popcountl
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# __builtin_popcountll
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# __builtin_powi
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# __builtin_powif
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# __builtin_powil
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# __builtin_prefetch
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# __builtin_trap
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# __builtin_types_compatible_p
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# __builtin_unreachable
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#
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# Unsupported built-ins will be tested with an empty parameter set and the
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# result of the check might be wrong or meaningless so use with care.
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#
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# LICENSE
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#
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# Copyright (c) 2013 Gabriele Svelto <gabriele.svelto@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 7
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AC_DEFUN([AX_GCC_BUILTIN], [
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AS_VAR_PUSHDEF([ac_var], [ax_cv_have_$1])
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AC_CACHE_CHECK([for $1], [ac_var], [
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AC_LINK_IFELSE([AC_LANG_PROGRAM([], [
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m4_case([$1],
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[__builtin_assume_aligned], [$1("", 0)],
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[__builtin_bswap16], [$1(0)],
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[__builtin_bswap32], [$1(0)],
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[__builtin_bswap64], [$1(0)],
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[__builtin_choose_expr], [$1(0, 0, 0)],
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[__builtin___clear_cache], [$1("", "")],
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[__builtin_clrsb], [$1(0)],
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[__builtin_clrsbl], [$1(0)],
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[__builtin_clrsbll], [$1(0)],
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[__builtin_clz], [$1(0)],
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[__builtin_clzl], [$1(0)],
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[__builtin_clzll], [$1(0)],
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[__builtin_complex], [$1(0.0, 0.0)],
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[__builtin_constant_p], [$1(0)],
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[__builtin_cpu_init], [$1()],
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[__builtin_cpu_is], [$1("intel")],
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[__builtin_cpu_supports], [$1("sse")],
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[__builtin_ctz], [$1(0)],
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[__builtin_ctzl], [$1(0)],
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[__builtin_ctzll], [$1(0)],
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[__builtin_expect], [$1(0, 0)],
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[__builtin_ffs], [$1(0)],
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[__builtin_ffsl], [$1(0)],
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[__builtin_ffsll], [$1(0)],
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[__builtin_fpclassify], [$1(0, 1, 2, 3, 4, 0.0)],
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[__builtin_huge_val], [$1()],
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[__builtin_huge_valf], [$1()],
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[__builtin_huge_vall], [$1()],
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[__builtin_inf], [$1()],
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[__builtin_infd128], [$1()],
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[__builtin_infd32], [$1()],
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[__builtin_infd64], [$1()],
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[__builtin_inff], [$1()],
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[__builtin_infl], [$1()],
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[__builtin_isinf_sign], [$1(0.0)],
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[__builtin_nan], [$1("")],
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[__builtin_nand128], [$1("")],
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[__builtin_nand32], [$1("")],
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[__builtin_nand64], [$1("")],
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[__builtin_nanf], [$1("")],
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[__builtin_nanl], [$1("")],
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[__builtin_nans], [$1("")],
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[__builtin_nansf], [$1("")],
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[__builtin_nansl], [$1("")],
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[__builtin_object_size], [$1("", 0)],
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[__builtin_parity], [$1(0)],
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[__builtin_parityl], [$1(0)],
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[__builtin_parityll], [$1(0)],
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[__builtin_popcount], [$1(0)],
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[__builtin_popcountl], [$1(0)],
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[__builtin_popcountll], [$1(0)],
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[__builtin_powi], [$1(0, 0)],
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[__builtin_powif], [$1(0, 0)],
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[__builtin_powil], [$1(0, 0)],
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[__builtin_prefetch], [$1("")],
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[__builtin_trap], [$1()],
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[__builtin_types_compatible_p], [$1(int, int)],
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[__builtin_unreachable], [$1()],
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[m4_warn([syntax], [Unsupported built-in $1, the test may fail])
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$1()]
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)
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])],
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[AS_VAR_SET([ac_var], [yes])],
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[AS_VAR_SET([ac_var], [no])])
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])
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AS_IF([test yes = AS_VAR_GET([ac_var])],
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[AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$1), 1,
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[Define to 1 if you have the '$1' built-in function])], [])
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AS_VAR_POPDEF([ac_var])
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])
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