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... to avoid a clang bug
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... when setting clang version to assume 3.7
Caused a lot of "integer expression expected" warnings by configure.
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When building with Cygwin or MinGW, libtool uses a wrapper executable
instead of a wrapper script [1], which is written in C and throws
missing-variable-declarations warnings. Don't enable these warnings on
Cygwin and MinGW in order to avoid warnings for every executable built,
which spams the test suite output when using Cygwin's clang.
[1] https://www.gnu.org/software/libtool/manual/html_node/Wrapper-executables.html
Closes https://github.com/curl/curl/pull/1665
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Since 5598b0bd63f690c151074494ce47ef872f004ab4, clang -v is used to
detect the clang version. The version number was expected to come after
the word "version". For Apple clang, this doesn't work as it has its
own versioning scheme.
The version number is now first searched after the string
"based on LLVM". This works for Apple clang before version 7, and also
for e.g. Ubuntu's clang up to version 3.7. If it's not found and the
version string contains "Apple LLVM version", clang version 3.7 is
assumed, which is the version that comes with Xcode 7. Otherwise, the
version number is still expected after the word "version", which works
for very old Apple clang versions.
Ref: https://trac.macports.org/wiki/XcodeVersionInfo
Fixes https://github.com/curl/curl/issues/1606
Closes https://github.com/curl/curl/pull/1607
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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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