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| author | Dennis Camera <skonfig@dtnr.ch> | 2022-08-26 00:31:18 +0200 |
|---|---|---|
| committer | Dennis Camera <skonfig@dtnr.ch> | 2022-08-26 00:31:18 +0200 |
| commit | ae193be2239144acb306b8ffac408130db441ce9 (patch) | |
| tree | 429f970d7acfb7648fe156360982816e38949376 | |
| parent | 494fe560e6e0367cc64f6796d103a296e49191ec (diff) | |
| download | skonfig-c-ae193be2239144acb306b8ffac408130db441ce9.tar.gz skonfig-c-ae193be2239144acb306b8ffac408130db441ce9.zip | |
[configure.ac] Fix false positive for -fstack-clash-protection with Apple Clang
Newer (> ~10) versions of Clang don't exit if they
see an unknown argument but only log a warning by
default.
So we check if the compiler supports
-Werror=unused-command-line-argument and if so,
we use it to check if the compiler options are
supported.
| -rw-r--r-- | configure.ac | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/configure.ac b/configure.ac index debf933..199a2fc 100644 --- a/configure.ac +++ b/configure.ac @@ -48,7 +48,12 @@ AC_DEFINE_UNQUOTED([_XOPEN_SOURCE], [${_want_xopen_level}], [define the X/Open c CFLAGS=${CFLAGS-}${CFLAGS:+ }-D_XOPEN_SOURCE=${_want_xopen_level} -# Check compiler options +# Checks for compiler options. +_cccheckingopts=$( + # clang (newer versions) don't fail if they see an unknown argument. + CFLAGS=-Werror=unused-command-line-argument + AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([], [])], [echo "${CFLAGS}"], []) +) check_ccopt() { ( _ccopt=${1:?} case ${CFLAGS-} in @@ -59,7 +64,7 @@ check_ccopt() { ( esac AC_MSG_CHECKING([whether ${CC} supports ${_ccopt}]) - CFLAGS=${CFLAGS-}${CFLAGS:+ }${_ccopt} + CFLAGS="${CFLAGS-} ${_cccheckingopts-} ${_ccopt}" AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([], [])], [AC_MSG_RESULT([yes]); return 0], @@ -89,7 +94,7 @@ check_set_ccopt -fsanitize=address && { } check_set_ccopt -fsanitize=undefined -# Check compiler capabilities +# Checks for compiler "C" capabilities AX_C___ATTRIBUTE__ if test x"${ax_cv___attribute__}" = x'yes' |