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Commit5788052

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Fix "quiet inline" configure test for newer clang compilers.
This test used to just define an unused static inline function and checkwhether that causes a warning. But newer clang versions warn aboutunused static inline functions when defined inside a .c file, but notwhen defined in an included header, which is the case we care about.Change the test to cope.Andres Freund
1 parent8c43980 commit5788052

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3 files changed

+19
-3
lines changed

3 files changed

+19
-3
lines changed

‎config/c-compiler.m4‎

Lines changed: 13 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -19,7 +19,18 @@ fi])# PGAC_C_SIGNED
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# PGAC_C_INLINE
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# -------------
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# Check if the C compiler understands inline functions.
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# Check if the C compiler understands inline functions without being
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# noisy about unused static inline functions. Some older compilers
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# understand inline functions (as tested by AC_C_INLINE) but warn about
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# them if they aren't used in a translation unit.
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#
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# This test used to just define an inline function, but some compilers
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# (notably clang) got too smart and now warn about unused static
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# inline functions when defined inside a .c file, but not when defined
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# in an included header. Since the latter is what we want to use, test
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# to see if the warning appears when the function is in a header file.
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# Not pretty, but it works.
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#
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# Defines: inline, USE_INLINE
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AC_DEFUN([PGAC_C_INLINE],
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[AC_C_INLINE
@@ -28,7 +39,7 @@ AC_CACHE_CHECK([for quiet inline (no complaint if unreferenced)], pgac_cv_c_inli
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if test "$ac_cv_c_inline" != no; then
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pgac_c_inline_save_werror=$ac_c_werror_flag
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ac_c_werror_flag=yes
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AC_LINK_IFELSE([AC_LANG_PROGRAM([static inline int fun () {return 0;}],[])],
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AC_LINK_IFELSE([AC_LANG_PROGRAM([#include "$srcdir/config/test_quiet_include.h"],[])],
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[pgac_cv_c_inline_quietly=yes])
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ac_c_werror_flag=$pgac_c_inline_save_werror
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fi])

‎config/test_quiet_include.h‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
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/*
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* For the raison d'etre of this file, check the comment above the definition
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* of the PGAC_C_INLINE macro in config/c-compiler.m4.
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*/
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staticinlineintfun () {return0; }

‎configure‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -15104,7 +15104,7 @@ _ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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static inline int fun () {return 0;}
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#include "$srcdir/config/test_quiet_include.h"
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int
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main ()
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{

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