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| author | Victor Stinner <victor.stinner@gmail.com> | 2017-02-06 13:24:00 (GMT) |
|---|---|---|
| committer | Victor Stinner <victor.stinner@gmail.com> | 2017-02-06 13:24:00 (GMT) |
| commit | 193ee0a0e8c543f8f731f8207df21a6cc1a08591 (patch) | |
| tree | b72d97a9ccae7f2244b1737db7d5106fad8715d0 /configure.ac | |
| parent | 5bad70def671612835d1fdacd83f8534920f4dcd (diff) | |
| download | cpython-193ee0a0e8c543f8f731f8207df21a6cc1a08591.zip cpython-193ee0a0e8c543f8f731f8207df21a6cc1a08591.tar.gz cpython-193ee0a0e8c543f8f731f8207df21a6cc1a08591.tar.bz2 | |
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.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 09b54a7..5610c57 100644 --- a/configure.ac +++ b/configure.ac @@ -1689,6 +1689,26 @@ yes) fi AC_MSG_RESULT($ac_cv_enable_unreachable_code_warning) + AC_MSG_CHECKING(if we can make implicit function declaration an error in $CC) + ac_save_cc="$CC" + CC="$CC -Werror=implicit-function-declaration" + AC_CACHE_VAL(ac_cv_enable_implicit_function_declaration_error, + AC_COMPILE_IFELSE( + [ + AC_LANG_PROGRAM([[]], [[]]) + ],[ + ac_cv_enable_implicit_function_declaration_error=yes + ],[ + ac_cv_enable_implicit_function_declaration_error=no + ])) + CC="$ac_save_cc" + AC_MSG_RESULT($ac_cv_enable_implicit_function_declaration_error) + + if test $ac_cv_enable_implicit_function_declaration_error = yes + then + CFLAGS_NODIST="$CFLAGS_NODIST -Werror=implicit-function-declaration" + fi + # if using gcc on alpha, use -mieee to get (near) full IEEE 754 # support. Without this, treatment of subnormals doesn't follow # the standard. |