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47764b0be4
This commit fixes the following build issue of libfastjson with old
enough compilers (4.8) and wchar disabled:
json_object.c: In function 'fjson_object_object_delete':
json_object.c:385:3: error: 'for' loop initial declarations are only allowed in C99 mode
for (int i = 0 ; i < FJSON_OBJECT_CHLD_PG_SIZE ; ++i) {
^
The code of libfastjson requires C99. If your compiler is recent
enough (gcc 5.x), then no problem, it is C99 by default, no additional
flags are needed.
If your compiler is older (for example gcc 4.8), then -std=c99 or
-std=gnu99 is explicitly needed to tell the compiler to accept C99
constructs. Testing the compiler for the availability of such flags is
done by libfastjson configure script. However, the test program used
by the configure script uses some wchar_t types, and therefore the
test checking for C99 availability fails on toolchains with wchar
disabled. From config.log:
configure:3928: checking for /home/test/buildroot/output/host/usr/bin/i586-buildroot-linux-uclibc-gcc option to accept ISO C99
[...]
configure:4077: /home/test/buildroot/output/host/usr/bin/i586-buildroot-linux-uclibc-gcc -std=gnu99 -c -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 conftest.c >&5
conftest.c:54:3: error: unknown type name 'wchar_t'
const wchar_t *name;
^
So, just like we did in libv4l in commit
f01396a158 ("libv4l: fix uclibc-ng
configure/compile"), let's hint directly the configure script that it
should use -std=gnu99. This fixes the build of libfastjson with old
compilers and wchar disabled.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 90430237cc)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches