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Prohibit implicit C function declarations
Issue #27659: use -Werror=implicit-function-declaration when possible (GCC and Clang, but it depends on the compiler version). Patch written by Chi Hsuan Yen.
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@ -698,6 +698,10 @@ Documentation
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Build
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-----
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- Issue #27659: Prohibit implicit C function declarations: use
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-Werror=implicit-function-declaration when possible (GCC and Clang, but it
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depends on the compiler version). Patch written by Chi Hsuan Yen.
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- Issue #29384: Remove old Be OS helper scripts.
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- Issue #26851: Set Android compilation and link flags.
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41
configure
vendored
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configure
vendored
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@ -7242,6 +7242,47 @@ fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_enable_unreachable_code_warning" >&5
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$as_echo "$ac_cv_enable_unreachable_code_warning" >&6; }
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if we can make implicit function declaration an error in $CC" >&5
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$as_echo_n "checking if we can make implicit function declaration an error in $CC... " >&6; }
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ac_save_cc="$CC"
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CC="$CC -Werror=implicit-function-declaration"
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if ${ac_cv_enable_implicit_function_declaration_error+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ac_cv_enable_implicit_function_declaration_error=yes
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else
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ac_cv_enable_implicit_function_declaration_error=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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CC="$ac_save_cc"
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_enable_implicit_function_declaration_error" >&5
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$as_echo "$ac_cv_enable_implicit_function_declaration_error" >&6; }
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if test $ac_cv_enable_implicit_function_declaration_error = yes
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then
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CFLAGS_NODIST="$CFLAGS_NODIST -Werror=implicit-function-declaration"
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fi
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# if using gcc on alpha, use -mieee to get (near) full IEEE 754
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# support. Without this, treatment of subnormals doesn't follow
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# the standard.
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20
configure.ac
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configure.ac
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@ -1689,6 +1689,26 @@ yes)
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fi
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AC_MSG_RESULT($ac_cv_enable_unreachable_code_warning)
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AC_MSG_CHECKING(if we can make implicit function declaration an error in $CC)
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ac_save_cc="$CC"
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CC="$CC -Werror=implicit-function-declaration"
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AC_CACHE_VAL(ac_cv_enable_implicit_function_declaration_error,
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AC_COMPILE_IFELSE(
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[
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AC_LANG_PROGRAM([[]], [[]])
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],[
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ac_cv_enable_implicit_function_declaration_error=yes
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],[
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ac_cv_enable_implicit_function_declaration_error=no
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]))
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CC="$ac_save_cc"
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AC_MSG_RESULT($ac_cv_enable_implicit_function_declaration_error)
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if test $ac_cv_enable_implicit_function_declaration_error = yes
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then
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CFLAGS_NODIST="$CFLAGS_NODIST -Werror=implicit-function-declaration"
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fi
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# if using gcc on alpha, use -mieee to get (near) full IEEE 754
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# support. Without this, treatment of subnormals doesn't follow
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# the standard.
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