[Webkit-unassigned] [Bug 161697] New: [CMake] Build failure with GCC 6 (fatal error: stdlib.h: No such file or directory)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161697

            Bug ID: 161697
           Summary: [CMake] Build failure with GCC 6 (fatal error:
                    stdlib.h: No such file or directory)
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
                CC: bugs-noreply at webkitgtk.org, lforschler at apple.com,
                    mcatanzaro at igalia.com, ossy at webkit.org,
                    raj.khem at gmail.com

Trying to build WebKitGTK+ with GCC 6 I got this error:

In file included from /home/igalia/clopez/yocto/commit-builds/meta-webkit/builds/qemux86-64/tmp-glibc/sysroots/qemux86/usr/include/c++/6.2.0/ext/string_conversions.h:41:0,
                 from /home/igalia/clopez/yocto/commit-builds/meta-webkit/builds/qemux86-64/tmp-glibc/sysroots/qemux86/usr/include/c++/6.2.0/bits/basic_string.h:5402,
                 from /home/igalia/clopez/yocto/commit-builds/meta-webkit/builds/qemux86-64/tmp-glibc/sysroots/qemux86/usr/include/c++/6.2.0/string:52,
                 from /home/igalia/clopez/yocto/commit-builds/meta-webkit/builds/qemux86-64/tmp-glibc/work/i586-oe-linux/webkitgtk/2.12.5-r0/webkitgtk-2.12.5/Source/ThirdParty/ANGLE/src/common/debug.h:14,
                 from /home/igalia/clopez/yocto/commit-builds/meta-webkit/builds/qemux86-64/tmp-glibc/work/i586-oe-linux/webkitgtk/2.12.5-r0/webkitgtk-2.12.5/Source/ThirdParty/ANGLE/src/common/mathutil.h:12,
                 from /home/igalia/clopez/yocto/commit-builds/meta-webkit/builds/qemux86-64/tmp-glibc/work/i586-oe-linux/webkitgtk/2.12.5-r0/webkitgtk-2.12.5/Source/ThirdParty/ANGLE/src/common/mathutil.cpp:9:
/home/igalia/clopez/yocto/commit-builds/meta-webkit/builds/qemux86-64/tmp-glibc/sysroots/qemux86/usr/include/c++/6.2.0/cstdlib:75:25: fatal error: stdlib.h: No such file or directory
 #include_next <stdlib.h>

The issue seems to be that GCC 6 has now introduced stdlib.h in libstdc++ for better compliance and its including the C library stdlib.h using include_next which is sensitive to order of system header include paths. See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70129

The recommended way to fix this is to stop adding include directories as system ones (-isystem) and instead use the standard way to include directories (-I)

The openembedded project is carrying this downstream patch against WebKitGTK+ 2.12 with the above fix: http://git.openembedded.org/openembedded-core/tree/meta/recipes-sato/webkit/files/0001-WebKitMacros-Append-to-I-and-not-to-isystem.patch


Seems that we started using -isystem on r185806 <http://trac.webkit.org/r185806> as a way to silence warnings.

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