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Commitbc18126

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Add configure test to see if the C compiler has gcc-style computed gotos.
We'll need this for the upcoming patch to speed up expression evaluation.Might as well push it now to see if it behaves sanely in the buildfarm.Andres FreundDiscussion:https://postgr.es/m/20170320062511.hp5qeurtxrwsvfxr@alap3.anarazel.de
1 parent14a7252 commitbc18126

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5 files changed

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5 files changed

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‎config/c-compiler.m4

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Original file line numberDiff line numberDiff line change
@@ -273,6 +273,30 @@ fi])# PGAC_C_BUILTIN_UNREACHABLE
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# PGAC_C_COMPUTED_GOTO
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# -----------------------
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# Check if the C compiler knows computed gotos (gcc extension, also
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# available in at least clang). If so, define HAVE_COMPUTED_GOTO.
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#
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# Checking whether computed gotos are supported syntax-wise ought to
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# be enough, as the syntax is otherwise illegal.
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AC_DEFUN([PGAC_C_COMPUTED_GOTO],
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[AC_CACHE_CHECK(forcomputedgotosupport,pgac_cv_computed_goto,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
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[[void *labeladdrs[] = {&&my_label};
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goto *labeladdrs[0];
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my_label:
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return 1;
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]])],
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[pgac_cv_computed_goto=yes],
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[pgac_cv_computed_goto=no])])
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if test x"$pgac_cv_computed_goto" = xyes ; then
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AC_DEFINE(HAVE_COMPUTED_GOTO,1,
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[Define to 1 if your compiler handles computed gotos.])
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fi])# PGAC_C_COMPUTED_GOTO
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# PGAC_C_VA_ARGS
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# --------------
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# Check if the C compiler understands C99-style variadic macros,

‎configure

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@@ -11531,6 +11531,40 @@ if test x"$pgac_cv__builtin_unreachable" = xyes ; then
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$as_echo"#define HAVE__BUILTIN_UNREACHABLE 1">>confdefs.h
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fi
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{$as_echo"$as_me:${as_lineno-$LINENO}: checking for computed goto support">&5
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$as_echo_n"checking for computed goto support...">&6; }
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if${pgac_cv_computed_goto+:}false;then:
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$as_echo_n"(cached)">&6
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else
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cat confdefs.h -<<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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void *labeladdrs[] = {&&my_label};
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goto *labeladdrs[0];
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my_label:
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return 1;
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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_compile"$LINENO";then:
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pgac_cv_computed_goto=yes
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else
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pgac_cv_computed_goto=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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{$as_echo"$as_me:${as_lineno-$LINENO}: result:$pgac_cv_computed_goto">&5
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$as_echo"$pgac_cv_computed_goto">&6; }
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iftest x"$pgac_cv_computed_goto" = xyes;then
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$as_echo"#define HAVE_COMPUTED_GOTO 1">>confdefs.h
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fi
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{$as_echo"$as_me:${as_lineno-$LINENO}: checking for __VA_ARGS__">&5
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$as_echo_n"checking for __VA_ARGS__...">&6; }

‎configure.in

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@@ -1322,6 +1322,7 @@ PGAC_C_BUILTIN_BSWAP32
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PGAC_C_BUILTIN_BSWAP64
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PGAC_C_BUILTIN_CONSTANT_P
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PGAC_C_BUILTIN_UNREACHABLE
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PGAC_C_COMPUTED_GOTO
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PGAC_C_VA_ARGS
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PGAC_STRUCT_TIMEZONE
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PGAC_UNION_SEMUN

‎src/include/pg_config.h.in

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@@ -108,6 +108,9 @@
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/* Define to 1 if you have the `clock_gettime' function. */
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#undef HAVE_CLOCK_GETTIME
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/* Define to 1 if your compiler handles computed gotos. */
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#undef HAVE_COMPUTED_GOTO
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/* Define to 1 if you have the <crtdefs.h> header file. */
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#undef HAVE_CRTDEFS_H
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‎src/include/pg_config.h.win32

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@@ -78,6 +78,9 @@
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/* Define to 1 if you have the `clock_gettime' function. */
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/* #undef HAVE_CLOCK_GETTIME */
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/* Define to 1 if your compiler handles computed gotos. */
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/* #undef HAVE_COMPUTED_GOTO */
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/* Define to 1 if you have the `crypt' function. */
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/* #undef HAVE_CRYPT */
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