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Support inlining various small performance-critical functions on non-GCC

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compilers, by applying a configure check to see if the compiler will accept
an unreferenced "static inline foo ..." function without warnings.  It is
believed that such warnings are the only reason not to declare inlined
functions in headers, if the compiler understands "inline" at all.

Kurt Harriman
This commit is contained in:
Tom Lane
2010-02-13 02:34:16 +00:00
parent b95a720a48
commit e08ab7c312
11 changed files with 137 additions and 46 deletions
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26
config/c-compiler.m4
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@ -1,5 +1,5 @@
# Macros to detect C compiler features
# $PostgreSQL: pgsql/config/c-compiler.m4,v 1.19 2008/06/27 00:36:16 tgl Exp $
# $PostgreSQL: pgsql/config/c-compiler.m4,v 1.20 2010/02/13 02:34:08 tgl Exp $
# PGAC_C_SIGNED
@ -17,6 +17,30 @@ fi])# PGAC_C_SIGNED
# PGAC_C_INLINE
# -------------
# Check if the C compiler understands inline functions.
# Defines: inline, USE_INLINE
AC_DEFUN([PGAC_C_INLINE],
[AC_C_INLINE
AC_CACHE_CHECK([for quiet inline (no complaint if unreferenced)], pgac_cv_c_inline_quietly,
[pgac_cv_c_inline_quietly=no
if test "$ac_cv_c_inline" != no; then
pgac_c_inline_save_werror=$ac_c_werror_flag
ac_c_werror_flag=yes
AC_LINK_IFELSE([AC_LANG_PROGRAM([static inline int fun () {return 0;}],[])],
[pgac_cv_c_inline_quietly=yes])
ac_c_werror_flag=$pgac_c_inline_save_werror
fi])
if test "$pgac_cv_c_inline_quietly" != no; then
AC_DEFINE_UNQUOTED([USE_INLINE], 1,
[Define to 1 if "static inline" works without unwanted warnings from ]
[compilations where static inline functions are defined but not called.])
fi
])# PGAC_C_INLINE
# PGAC_TYPE_64BIT_INT(TYPE)
# -------------------------
# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to