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curl-compilers.m4: turn implicit function declarations into errors

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This adds -Werror-implicit-function-declaration for GCC 2.95+ so that
these errors are visible at the point where they occur instead of only
at link time.
Implicit function declarations are illegal in C99 and C++ anyway, and
the same warning has been turned into an error for ICC in commit
3072c5b8a1.

Ref: https://gcc.gnu.org/onlinedocs/gcc-2.95.2/gcc_2.html#SEC8
Ref: https://curl.haxx.se/mail/lib-2017-04/0001.html
Closes https://github.com/curl/curl/pull/1419
This commit is contained in:
Marcel Raad 2017-04-14 12:48:27 +02:00
parent e50e2850ba
commit 9168e2470d
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1 changed files with 5 additions and 2 deletions
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7
m4/curl-compilers.m4
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@ -577,8 +577,11 @@ AC_DEFUN([CURL_SET_COMPILER_BASIC_OPTS], [
#
GNU_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
dnl turn implicit-function-declaration warning into error,
dnl at least gcc 2.95 and later support this
if test "$compiler_num" -ge "295"; then
tmp_CFLAGS="$tmp_CFLAGS -Werror-implicit-function-declaration"
fi
;;
#
HP_UX_C)