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gcc does not support testing for negated warnings. See here for details:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63499
This patch changes CC_CHECK_FLAG_APPEND to always test for the non-negated
warnings.
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All tests for compiler support were failing with:
/usr/bin/ld: /tmp/ccwnVc2A.o: relocation R_ARM_MOVW_ABS_NC against `a' can not be used when making a shared object; recompile with -fPIC
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Use AC_LINK_IFELSE instead of AC_COMPILE_IFELSE to test for flags that
might succeed during compilation but not during linking. An example is gcc
compiled with libssp support but gnu-ld without it. In this case
-fstack-protector works fine during compilation but fails during linking
as several internal helpers are missing.
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The affected files in this patch had inconsistent use of tabs vs. spaces
for indentation, and this patch eliminates the stray tabs.
Also, the opening brace of sigchld_hdl() in activate.c was moved so the
opening braces are consistent throughout the file.
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Clang don't treat unknown warnings flags as an error, but rather as a
warning. The result is that the detection for whic CFLAGS are supported
by this compiler will not work, since the compilation will succeed.
With this patch we now successfully detect clang doesn't support
-Wlogical-op, as opposed to previous behavior:
checking if clang supports flag -Wlogical-op in envvar CFLAGS... no
We use this macro only for LDFLAGS and CFLAGS, so it's safe to stash
-Werror there.
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Set a separate variable for adding warning flags. Build systems are not
supposed to change CFLAGS and LDFLAGS, these are user variables.
Reference: http://www.gnu.org/software/automake/manual/html_node/Flag-Variables-Ordering.html
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This removes some warnings when bootstrapping. The warnings were introduced
in autoconf 2.68. Reference:
http://www.flameeyes.eu/autotools-mythbuster/forwardporting/autoconf.html
The following code
AC_COMPILE_IFELSE([
<MY C CODE HERE>
], ...)
is changed to
AC_COMPILE_IFELSE(
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([
<MY C CODE HERE>
])], ...)
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