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It usually warns when using commas instead of semicolons or other
operators by accident.
Closes https://github.com/curl/curl/pull/1578
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It usually warns when forgetting to declare TU-local variables static.
Closes https://github.com/curl/curl/pull/1578
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Enable -Wdouble-promotion for both GCC and clang. It warns on implicit
promotion from float to double.
Closes https://github.com/curl/curl/pull/1578
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Previously, that warning was only implicitly active in C90 mode.
Enable it unconditionally as already done for GCC.
Closes https://github.com/curl/curl/pull/1578
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Otherwise, they are removed in the final configure file.
Also changed sed to "$SED" like in most other calls in this file.
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"clang -dumpversion" always returns "4.2.1", the GCC version that clang
was initially compatible to. Use "clang -v" instead, which returns the
actual clang version.
Fixes https://github.com/curl/curl/issues/1522
Closes https://github.com/curl/curl/pull/1523
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clang 2.9+ supports -Wshift-sign-overflow, which warns about undefined
behavior on signed left shifts when shifting by too many places.
Ref: https://github.com/curl/curl/issues/1516
Closes https://github.com/curl/curl/pull/1517
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-Og, introduced in GCC 4.8, optimizes for debugging experience.
-Ofast, introduced in GCC 4.7, builds on -O3 and enables further
optimizations breaking strict standards compliance.
When specified in CFLAGS, these were always overridden by -O0 or -O2.
Fix this by adding them to flags_opt_all.
Ref: https://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/Optimize-Options.html
Ref: https://github.com/curl/curl/pull/1404#issuecomment-296401570
Closes https://github.com/curl/curl/pull/1440
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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
3072c5b8a127057aa922b7c51051bbb4a630b091.
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
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We're mostly saying just "curl" in lower case these days so here's a big
cleanup to adapt to this reality. A few instances are left as the
project could still formally be considered called cURL.
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Some builds of GCC produce output on both stdout and stderr when --help
--verbose is used. The 2>&1 redirection caused them to be arbitrarily
interleaved with each other because of stream buffering. Consequently,
grep failed to match the fvisibility= string in the mixed output, even
though the string was present in GCC's standard output.
This led to silently disabling symbol hiding in some builds of curl.
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The latest version(s) of the icc compiler no longer accept the extra
space in the -we (warning enable), -wd (warning disable), etc.
Reported-by: Elmira A Semenova
Bug: http://curl.haxx.se/mail/lib-2013-09/0182.html
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The compiler test used a variable before it was assigned when it tried
to see how it acts on a mismatching prototype, which could cause a false
positive.
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Fix proper macro expansion order across autotools versions for
C compiler and preprocessor program checks.
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When nothing is told to configure, we should not enforce switching off
debug options with -g0 (or similar). We instead don't use -g at all in
that situaion and therefore allow the user's CFLAGS settings possibly
dictate what to do.
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Currently it is unknown if there is any version of clang that
actually supports -Wstrict-aliasing. What is known is that there
are several that don't support it.
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When building a Windows target with gcc 4.5 or newer and strict compiler
warnings enabled use -Wno-pedantic-ms-format in addition to other flags.
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This protects from attribute names being defined by third party's code.
Improvement: http://curl.haxx.se/mail/lib-2012-04/0127.html
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configure script now provides conditional definitions for Makefile.am
that result in CURL_HIDDEN_SYMBOLS being defined by resulting makefiles
when appropriate.
Additionally, configure script option for symbol hiding control is now
named --enable-symbol-hiding --disable-symbol-hiding. While still valid,
old option name --enable-hidden-symbols --disable-hidden-symbols will
be deprecated in some future release.
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Add CURL_CHECK_COMPILER as a requirement.
Ensure macro does nothing unless GNU_C or CLANG compiler is used.
This should allow usage of this macro in unforeseen placements.
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Temporarily, When cross-compiling with gcc 3.0 or later, enable strict aliasing
rules and warnings. Given that cross-compiled targets autobuilds do not run the
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with the low-level curl debug memory tracking 'feature' to allow decoupled
setting from --enable-debug.
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*_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE to *-compilers.m4 along with other *_CHECK_COMPILER_*
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the socklen_t issue on this platform.
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Select ANSI C89 dialect plus GNU extensions, again.
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Select precise floating-point model, otherwise doubles are less than 64-bit wide
icc test adjustment:
Select c89 dialect
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Enable more icc warnings.
Optimization disabling options used only for icc 9.1
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